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Salmanpour F, Camcı H. Effect of different post materials and designs on upper central tooth torque and intrusion load: A finite element analysis study. Int Orthod 2024; 22:100903. [PMID: 39181038 DOI: 10.1016/j.ortho.2024.100903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2024] [Revised: 07/26/2024] [Accepted: 07/26/2024] [Indexed: 08/27/2024]
Abstract
PURPOSES The aim of this study was to examine the effects of post material type and the presence of ferrules on the torque and intrusion load of the upper central tooth using finite element analysis. METHODS The upper central tooth and surrounding tissues (cortical bone, cancellous bone, and periodontal ligament) were modelled in three dimensions using the Spaceclaim software. Five simulated models (SM) different modifications were made to this main model: metal cast post (SM1) and glass fiber post-core with zirconium crown and without a ferrule (SM2), metal cast (SM3) post and glass fiber post with a ferrule and zirconium crown (SM4) and only zirconium crown (SM5). In all five simulations, in order to simulate lingual root torque movement, a total load of 40 grams was applied to the bracket slot as 20 grams of force couples and in order to simulate intrusion movement, a load of 40 grams was applied to the superior wall of the bracket slot. The stress caused by the applied loads on the root surfaces was determined using finite element analysis. Maximum principal stress (MPS) value was used in the comparison. RESULTS The highest root surface MPS values for both intrusion and torque loads belonged to SM2 (3.864 and 0.379MPa, respectively). The presence of ferrules in both intrusion and torque loads reduced the stress by approximately half (from 3.864 to 2.004MPa). In all five models, the radicular area with higher stress was located in the cervical third on the lingual surface when both torque and intrusion loads were applied. CONCLUSION The amount and localization of stress was affected by the type of post material. The variation in stress values between the materials remains within a safe range (0.099 and 3.87MPa), making both materials suitable for use under orthodontic forces.
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Affiliation(s)
- Farhad Salmanpour
- Department of Orthodontics, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey.
| | - Hasan Camcı
- Department of Orthodontics, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
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Popovic MA, Lussier B, Chizari K, Dumais Y. Effect of Pulp Chamber Access, Instrumentation, Obturation, and Restoration on the Fracture Resistance of Endodontically Treated Canine Teeth in Dogs. J Vet Dent 2024:8987564241264036. [PMID: 39042869 DOI: 10.1177/08987564241264036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
Veterinary studies documenting the effect of endodontic treatment on tooth fracture resistance are scarce. The objective of this ex vivo study was to evaluate the effects of mesial access preparation and restoration, as well as pulp chamber access, instrumentation, obturation, and restoration, on the fracture resistance and characteristics of canine teeth in dogs. Sixty-five dog canine teeth were divided into 4 groups: 1. Standard endodontic treatment through a mesial access only; 2. Treatment as per group 1, adding an incisal access, instrumentation and obturation of the pulp chamber, and restoration of the access; 3. Treatment as per group 2, without pulp chamber obturation or restoration of the incisal access; and 4. Untreated teeth. The fracture resistance and characteristics of each group were documented using axial compression testing, angled 45° disto-occlusal to the long axis of the crown. The maximum force prior to fracture in groups 1, 3, and 4 were not statistically different, demonstrating that restored mesial and incisal accesses with pulp chamber instrumentation did not statistically affect fracture resistance. However, obturated and restored group 2 teeth demonstrated decreased fracture resistance compared to all other groups (P < .001). Additionally, 26.7% of group 1 teeth sustained complicated crown fractures, while 100% of group 2 teeth fractured within the obturation or restorative materials, preventing pulp exposure in these cases. Although the cause and clinical importance of decreased tooth fracture resistance following pulp chamber obturation and restoration remains unknown, it may provide protective value for maintaining a coronal seal in the event of tooth fracture.
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Affiliation(s)
- Maya Alexandra Popovic
- Centre Hospitalier Universitaire Vétérinaire, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC, Canada
| | - Bertrand Lussier
- Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC, Canada
| | - Kambiz Chizari
- Department of Mechanical Engineering, Polytechnique Montreal, Montreal, QC, Canada
| | - Yvan Dumais
- Centre Hospitalier Universitaire Vétérinaire, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC, Canada
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Dong S, Peng M, Wu G, Yao C, Huang C, Liang S. Does an incomplete ferrule affect the fracture of endodontically treated teeth? A systematic review of in vitro studies. J Dent 2024; 146:105068. [PMID: 38740250 DOI: 10.1016/j.jdent.2024.105068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/08/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024] Open
Abstract
OBJECTIVE The purpose of this systematic review was to assess the impact of the incomplete ferrule on the fracture of endodontically treated teeth (ETT). DATA The keywords such as "incomplete ferrule," "ferrule," "ferrule effect," "residual dentin," "remaining dentin," or "remaining coronal dentin" were used for searching, and only in vitro studies investigating the incomplete ferrule effect on natural teeth were included. SOURCES PubMed, Medline, Embase, Cochrane Library, and Science Direct databases, and manual-searching. STUDY SELECTION The search strategy yielded 1633 hits, and a total of 19 in vitro studies closely related to the effect of incomplete ferrule on ETT were included. CONCLUSION The presence of an incomplete ferrule may significantly increase the fracture resistance of restored ETT, compared with restored ETT without ferrule. The number of residual axial walls of the incomplete ferrule may have an impact on the fracture resistance and fracture mode. The location of residual axial walls of the incomplete ferrule may affect the fracture resistance but not the fracture mode. CLINICAL IMPLICATIONS Limited data suggest that the presence of incomplete ferrule has a positive effect on the fracture resistance of restored ETT. An incomplete ferrule can be an alternative for restoring ETT when a complete ferrule is not present. Nevertheless, further high-quality studies are still needed to offer more robust evidence and to take potential confounding factors into account.
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Affiliation(s)
- Shiying Dong
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Hongshan District, Wuhan 430079, PR China; Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, PR China
| | - Mengdong Peng
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Hongshan District, Wuhan 430079, PR China
| | - Guomin Wu
- College & Hospital of Stomatology, Anhui Medical University, Key Lab of Oral Diseases Research of Anhui Province, Hefei 230032, PR China
| | - Chenmin Yao
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Hongshan District, Wuhan 430079, PR China
| | - Cui Huang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Hongshan District, Wuhan 430079, PR China
| | - Shanshan Liang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, 237# Luoyu Road, Hongshan District, Wuhan 430079, PR China.
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Kondo D, Komada W, Oishi S, Fueki K. Surface strain at the cervical area and fracture strength of flared root canals reinforced using a zirconia tube and glass-fiber post. J Dent Sci 2024; 19:1571-1577. [PMID: 39035343 PMCID: PMC11259610 DOI: 10.1016/j.jds.2023.12.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/19/2023] [Indexed: 07/23/2024] Open
Abstract
Background/purpose Recently, an effective core build-up system for teeth with flared root canals is needed. This research aimed to evaluate the effect of foundation restorations using a composite resin core with a fiber post reinforced with a zirconia tube for the surface strain at the cervical area and the fracture load of teeth with flared root canals. Materials and methods Bovine teeth were shaped to mimic human premolars with flared root canals and restored using three types of composite resin foundation restorations with each materials described below: a fiber post (FC), a zirconia tube (ZC), a fiber post and zirconia tube (ZFC). Each specimen was restored with a zirconia crown. The surface strains of the specimens at the cervical area and fracture loads were analyzed using a one-way analysis of variance (ANOVA), followed by Tukey's honest significant difference test. Results The surface strains of Groups ZFC and ZC were significantly lower than that of Group FC in the buccal root. The fracture strengths of Groups ZFC and ZC were significantly higher than that of Group FC. The strength of Group ZFC was significantly higher than that of Group ZC. Conclusion The use of a composite resin core with a zirconia tube for the simulated premolar with flared root canals reduced surface strain at the cervical area and provided higher fracture strength compared to using a composite resin core with a fiber post. And the zirconia tubes provided even higher fracture strength when used with a fiber post.
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Affiliation(s)
- Daiki Kondo
- Division of Masticatory Function and Health Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Komada
- Division of Masticatory Function and Health Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shinya Oishi
- Division of Masticatory Function and Health Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Kenji Fueki
- Division of Masticatory Function and Health Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Liang M, Zeyong L, Li Y, Chen Q, Meng X. Biomechanical impact of labiolingual diameter on endodontically treated anterior teeth with crown restoration under occlusal loading. J Appl Oral Sci 2024; 32:e20230439. [PMID: 38896638 PMCID: PMC11182641 DOI: 10.1590/1678-7757-2023-0439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/27/2024] [Accepted: 04/22/2024] [Indexed: 06/21/2024] Open
Abstract
OBJECTIVE To evaluate the effect of the labiolingual diameter and construction of an endodontically treated (ET) anterior tooth with crown restoration on stress distribution and biomechanical safety under occlusal loading. METHODOLOGY Three-dimensional finite element models were generated for maxillary central incisors with all-ceramic crown restorations. The labiolingual diameters of the tooth, defined as the horizontal distance between the protrusion of the labial and lingual surfaces, were changed as follows: (D1) 6.85 mm, (D2) 6.35 mm, and (D3) 5.85 mm. The model was constructed as follows: (S0) vital pulp tooth; (S1) ET tooth; (S2) ET tooth with a 2 mm ferrule, restored with a fiber post and composite resin core; (S3) ET tooth without a ferrule, restored with a fiber post and composite resin core. A total of 12 models were developed. In total, two force loads (100 N) were applied to the crown's incisal edge and palatal surface at a 45° oblique angle to the longitudinal axis of the teeth. The Von Mises stress distribution and maximum stress of the models were analyzed. RESULTS Regardless of the loading location, stress concentration and maximum stress (34.07~66.78MPa) in all models occurred in the labial cervical 1/3 of each root. Both labiolingual diameter and construction influenced the maximum stress of the residual tooth tissue, with the impact of the labiolingual diameter being greater. A reduction in labiolingual diameter led to increased maximum stress throughout the tooth. The ferrule reduced the maximum stress of the core of S2 models (7.15~10.69 MPa), which is lower compared with that of S3 models (19.45~43.67 MPa). CONCLUSION The labiolingual diameter exerts a greater impact on the biomechanical characteristics of ET anterior teeth with crown restoration, surpassing the influence of the construction. The ferrule can reduce the maximum stress of the core and maintain the uniformity of stress distribution.
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Affiliation(s)
- Miao Liang
- Nanjing University, Affiliated Hospital of Medical School, Nanjing Stomatological Hospital, Department of General Dentistry, Nanjing, 210008, China
| | - Lamu Zeyong
- Nanjing University, Affiliated Hospital of Medical School, Nanjing Stomatological Hospital, Department of Prosthodontics, Nanjing, 210008, China
| | - Yongheng Li
- Southeast University, School of Biological Science & Medical Engineering, Biomechanics Laboratory, Nanjing, 210008, China
| | - Qiang Chen
- Southeast University, School of Biological Science & Medical Engineering, Biomechanics Laboratory, Nanjing, 210008, China
| | - Xiangfeng Meng
- Nanjing University, Affiliated Hospital of Medical School, Nanjing Stomatological Hospital, Department of Prosthodontic Technology, Nanjing, 210008, China
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Liu Y, Huang X, Ke H, Song X, Huang X, Sun S. Influence of Access Cavities on Maxillary Central Incisor Fracture Resistance: Finite Element Study. Int Dent J 2024:S0020-6539(24)00121-7. [PMID: 38692963 DOI: 10.1016/j.identj.2024.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 03/26/2024] [Accepted: 04/08/2024] [Indexed: 05/03/2024] Open
Abstract
INTRODUCTION AND AIMS Altering the position and orientation of the root canal access cavity passway, or modifying the reduction of dentin volume, can influence the strength of dentition. This study aimed to compare the effects of different access cavities on the biomechanical performances of maxillary central incisors with a finite element analysis. METHODS Based on the micro-computed tomography (CT) scan of a maxillary central incisor, the finite element models of the intact tooth and teeth with 4 access cavity designs: conservative incisal access cavity, incisal access cavity, conservative access cavity, and traditional access cavity were generated. Simulated occlusal forces were applied at the incisal edge of the incisor in the finite element analysis procedure. RESULTS The maximum von Mises stress and maximum principal stress in the cervical area are highest in the traditional access cavity group, followed by the conservative access cavity group, incisal access cavity group, and conservative incisal access cavity group. CONCLUSION The conservative access cavities minimise the extent of dentin removal from the cervical region, protecting the mechanical behaviour of the incisor. Moving the access cavity entry point to the incisal edge also improves the fracture resistance of the incisor. CLINICAL RELEVANCE This study's findings would help clinicians select the most appropriate endodontics access cavity method when performing the root canal on maxillary central incisors.
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Affiliation(s)
- Yujiang Liu
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinyao Huang
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Haoyu Ke
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinyi Song
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Xinmeng Huang
- Hospital of Stomatology, Jilin University, Changchun, PR China
| | - Shufen Sun
- Hospital of Stomatology, Jilin University, Changchun, PR China.
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Santos Pantaleón D, Tribst JPM, García-Godoy F. Influence of size-anatomy of the maxillary central incisor on the biomechanical performance of post-and-core restoration with different ferrule heights. J Adv Prosthodont 2024; 16:77-90. [PMID: 38694191 PMCID: PMC11058349 DOI: 10.4047/jap.2024.16.2.77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 03/08/2024] [Accepted: 04/09/2024] [Indexed: 05/04/2024] Open
Abstract
PURPOSE The study aims to investigate the influence of the ferrule effect and types of posts on the stress distribution in three morphological types of the maxillary central incisor. MATERIALS AND METHODS Nine models were created for 3 maxillary central incisor morphology types: "Fat" type - crown 12.5 mm, root 13 mm, and buccolingual cervical diameter 7.5 mm, "Medium" type - crown 11 mm, root 14 mm, and buccolingual cervical diameter 6.5 mm, and "Slim" type - crown 9.5 mm, root 15 mm, and buccolingual cervical diameter 5.5 mm. Each model received an anatomical castable post-and-core or glass-fiber post with resin composite core and three ferrule heights (nonexistent, 1 mm, and 2 mm). Then, a load of 14 N was applied at the cingulum with a 45° slope to the long axis of the tooth. The Maximum Principal Stress and the Minimum Principal Stress were calculated in the root dentin, crown, and core. RESULTS Higher tensile and compression stress values were observed in root dentin using the metallic post compared to the fiber post, being higher in the slim type maxillary central incisor than in the medium and fat types. Concerning the three anatomical types of maxillary central incisors, the slim type without ferrule height in mm presented the highest tensile stress in the dentin, for both types of metal and fiber posts. CONCLUSION Post system and tooth morphology were able to modify the biomechanical response of restored endodontically-treated incisors, showing the importance of personalized dental treatment for each case.
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Affiliation(s)
- Domingo Santos Pantaleón
- Health Research Institute, Faculty Health Sciences, Autonomous University of Santo Domingo, and Institute for Dental Education and Research, San Francisco de Macorís, Dominican Republic
| | - João Paulo Mendes Tribst
- Department of Reconstructive Oral Care, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Free University Amsterdam, The Netherlands
| | - Franklin García-Godoy
- Bioscience Research Center, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
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Maximiano GS, de Carvalho GM, Felipe Ferreira FFDC, de Almeida Pinheiro F, Noritomi PY, Campos MJDS, Vitral RWF. Comparative analysis of the biomechanical behavior of the maxillary central incisors restored with glass fiber post and cast metal post and core submitted to orthodontic forces: A study with finite elements. Am J Orthod Dentofacial Orthop 2024; 165:46-53. [PMID: 37656069 DOI: 10.1016/j.ajodo.2023.06.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 06/01/2023] [Accepted: 06/01/2023] [Indexed: 09/02/2023]
Abstract
INTRODUCTION Different types of intraradicular restorations and their insertion have an impact on teeth biomechanics. This study aimed to analyze the biomechanical behavior of maxillary central incisors restored with glass fiber post (GFP) and cast metal post and core (CMP) subjected to buccolingual and mesiodistal orthodontic forces using the finite element method. METHODS Two models of the maxillary central incisor with periodontal ligament, cortical bone, and trabecular bone were made. One of the models included intraradicular restoration with GFP, whereas, in the other, the incisor was restored with CMP. After creating the tridimensional mesh of finite elements, applying 2 orthodontic forces were simulated: 65 g of buccolingual force and 70 g of mesiodistal force. The forces were applied parallel to the palatal plane in the region of the bracket slot, located 4 mm to the incisal edge. RESULTS The maximum stresses generated in the GFP-restored root were 3.642 × 10-1 MPa and 4.755 × 10-1 MPa from the buccolingual and mesiodistal forces, respectively. Likewise, the stresses in the CMP restored root were 2.777 × 10-1MPa and 3.826 × 10-1MPa. The radicular area with higher stress on both models was located in the cervical third: on the buccal surface when the buccolingual force was applied and on the mesial surface when the mesiodistal force was applied. The highest stress levels were found on the CMP structure. CONCLUSIONS The incisor restored with cast metal post revealed lower stress values transferred to the root than the one restored with GFP. The stresses on the structure of the GFP were lower and more homogeneous than the ones found on the cast metal post. The difference among the stress values in the materials is within a safe margin for using both materials in relation to orthodontic forces.
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Affiliation(s)
- Gustavo Silva Maximiano
- Department of Orthodontics, Juiz de Fora Federal University, Juiz de Fora, Minas Gerais, Brazil
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Zhong Q, Huang Y, Zhang Y, Song Y, Wu Y, Qu F, Wang S, Xu C. Finite element analysis of maxillary first molar with a 4-wall defect and 1.5-mm-high ferrule restored with fiber-reinforced composite resin posts and resin core: The number and placement of the posts. J Prosthet Dent 2024; 131:75-91. [PMID: 35249741 DOI: 10.1016/j.prosdent.2022.01.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 01/14/2022] [Accepted: 01/19/2022] [Indexed: 12/01/2022]
Abstract
STATEMENT OF PROBLEM Whether fiber-reinforced composite (FRC) posts should be inserted in root canals to restore teeth with multiple roots remains unclear. PURPOSE The purpose of this finite element analysis (FEA) study was to determine the optimal use of FRC posts in an endodontically treated maxillary first molar with a 4-wall defect and 1.5-mm-high ferrule. MATERIAL AND METHODS Eight different models of a maxillary first molar were established: no post (NP), post in palatal root (P), post in distobuccal root (DB), post in mesiobuccal root (MB), posts in palatal root and distobuccal root (P+DB), posts in palatal root and mesiobuccal root (P+MB), posts in 2 buccal roots (DB+MB), and posts in all roots (P+DB+MB). Two types of loading were applied: a force of 800 N parallel to the long axis of the tooth to simulate the vertical masticatory force and another force of 225 N at 45 degrees to the long axis of the tooth to simulate the lateral masticatory force. The equivalent stresses on the external surfaces of the tooth tissue, the internal surfaces of the root canals and in the posts, as well as the maximal shear stresses on the post-core interface and the core-dentin interface, were calculated with FEA. RESULTS All the models showed similar maximal equivalent stress values on the external surfaces of the tooth tissue, and stress concentrations were found at the cervical and furcation area. On the internal surfaces of root canals, an increase of equivalent stress at the middle third of the canals with posts and a decrease at the cervical third were observed. Under vertical loading, the P+DB+MB group showed the largest equivalent stress in the post (76.45 MPa in the palatal post), the DB+MB group showed the largest shear stress on the post-core interface (19.02 MPa), and the MB group showed the largest shear stress on the core-dentin interface (12.07 MPa). Under lateral loading, the P+DB+MB group showed the largest equivalent stress in the post (60.11 MPa in the mesiobuccal post) and the largest shear stress on the post-core interface (13.48 MPa) and the DB group showed the largest shear stress on the core-dentin interface (21.03 MPa). CONCLUSIONS One post in the palatal canal was found to be appropriate for the FRC post and resin core restoration of a maxillary first molar with a 4-wall defect and 1.5-mm-high ferrule. An additional post in the mesiobuccal canal could help disperse lateral occlusal force and improve retention of the restoration.
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Affiliation(s)
- Qi Zhong
- Graduate student, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Yujie Huang
- Graduate student, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Yifan Zhang
- Graduate student, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Yingshuang Song
- Resident, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Yaqin Wu
- Doctoral student, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Fang Qu
- Resident, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China
| | - Shaohai Wang
- Professor, Department of Stomatology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, PR China
| | - Chun Xu
- Professor, Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
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Morgan LFDSA, Martins AV, Hauss DD, Maia LM, Silva NRFA, Silveira RRD, Albuquerque RDC. Treatment of a severely compromised endodontically treated tooth with a 2-piece premanufactured glass-fiber post: A clinical report. J Prosthet Dent 2023:S0022-3913(23)00541-3. [PMID: 38057198 DOI: 10.1016/j.prosdent.2023.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 08/05/2023] [Accepted: 08/09/2023] [Indexed: 12/08/2023]
Abstract
A 2-piece premanufactured glass-fiber post-and-core for a child with a severely compromised endodontically treated tooth to restore dental form, function, and esthetics, is described. A shorter chair time than for the conventional options was needed, and the post provided an adequate biomechanical response with a reduced intracanal cement thickness.
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Affiliation(s)
- Luís Fernando Dos Santos Alves Morgan
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Adriana Vieira Martins
- Professor, Department of Restorative Dentistry, UNA Dentistry School (UNA), Sete Lagoas, Minas Gerais, Brazil.
| | - Débora Drummond Hauss
- Professor, Department of Restorative Dentistry, College of Business Studies (FEAD), Belo Horizonte, Minas Gerais, Brazil
| | - Lucas Moreira Maia
- Professor, Department of Restorative Dentistry, Pitágoras Faculty, Belo Horizonte, Minas Gerais, Brazil
| | - Nelson Renato França Alves Silva
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Rodrigo Richard da Silveira
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - Rodrigo de Castro Albuquerque
- Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
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Ming X, Zhang Z, Xie W, Zhang Y, Li Y, Zhang W. Internal adaptation and mechanical properties of CAD/CAM glass fiber post-cores in molars: An in vitro study. J Dent 2023; 138:104685. [PMID: 37659715 DOI: 10.1016/j.jdent.2023.104685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 08/16/2023] [Accepted: 08/30/2023] [Indexed: 09/04/2023] Open
Abstract
OBJECTIVE The purpose of this in vitro study was to evaluate the internal adaptation, fracture resistance, and fracture pattern of the residual roots and crowns of molars restored with computer-aided design/computer-aided manufacturing (CAD/CAM) glass fiber post-cores, and compare them with three other post-core restorations. MATERIALS AND METHODS We selected 32 extracted maxillary first molars and divided them into four groups according to the post-core system: traditional casting titanium (Ti) post-cores (TC group); Ti post-cores fabricated with selective laser melting (SLM group); CAD/CAM glass fiber post-cores of the split type (CCS group); and prefabricated glass fiber posts and composite resin cores (PF group). The internal adaptation was analyzed with microcomputed tomography. Teeth were restored with monolithic zirconia crowns and subjected to thermocycling and cyclic loading. A load was applied consistently along the long axis of the tooth until fracture to record the fracture resistance and pattern. For the statistical analysis, one- and two-way analyses of variance, Tukey's post hoc and chi-square tests were performed to compare the differences among the groups. RESULTS The CCS, TC, and SLM groups exhibited similar internal adaptations across all sections (P < 0.05). The FP group showed good fit with the root canals in the apical and middle sections but a poor fit with those in the cervical section. The fracture resistance was higher in the CCS, TC, and SLM groups compared to the PF group (P < 0.05). The proportions of restorable fractures in the CCS and PF groups were 62.5% and 50%, respectively. Unrestorable fractures were more frequent in the TC and SLM groups at frequencies of 100% and 87.5%, respectively. CONCLUSION The internal adaptation and fracture resistance of the CCS group were similar to those of the TC and SLM groups, and the fracture pattern was mostly restorable, thus meeting the clinical requirements for molar post-core restorations. CLINICAL SIGNIFICANCE CCS can be used to restore residual roots and crowns of molars and exhibit high efficacy in terms of adaptability and mechanical properties. More studies are required to evaluate the effectiveness of CCS.
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Affiliation(s)
- Xianqing Ming
- Department of Oral Special Consultation, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, PR China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing, PR China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing, PR China
| | - Ziwei Zhang
- Department of Oral Special Consultation, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, PR China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing, PR China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing, PR China
| | - Wenjing Xie
- Department of Stomatology, Jinling Hospital, Clinical School, Medical College, Nanjing University, Nanjing, PR China
| | - Yuhang Zhang
- Digital Center, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, PR China
| | - Yanyan Li
- Department of Stomatology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, PR China
| | - Wei Zhang
- Department of Oral Special Consultation, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, PR China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing, PR China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing, PR China.
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Koosha S, Jebelizadeh MS, Mostafavi AS. Effect of Ferrule Location on Fracture Resistance of Maxillary Premolars: An In Vitro Study. Int J Dent 2023; 2023:9513804. [PMID: 37593681 PMCID: PMC10432005 DOI: 10.1155/2023/9513804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 06/19/2023] [Accepted: 06/26/2023] [Indexed: 08/19/2023] Open
Abstract
Objectives The present study aimed to assess the effect of ferrule location on fracture resistance of maxillary premolars. Materials and Methods A total of 72 extracted human maxillary premolars were selected and randomly assigned to six groups (n = 12 in each) considering ferrule location: circumferential ferrule (CF), without ferrule (WF), buccal ferrule (BF), lingual ferrule (LF), mesial ferrule (MF), and buccal-lingual ferrule (BLF). Cast posts were cemented into the prepared post spaces. Following conventional impression, Ni-Cr crowns were cemented to the specimens. After thermocycling (5,000 cycles, 5-55°C), the specimens were loaded at 45° in a universal testing machine until fracture. Data were analyzed with one-way ANOVA, Kolmogorov-Smirnov, and Tamhane tests. Results The maximum and minimum mean fracture resistance were related to the CF (1,143.84 N) and WF (514.89 N) groups, respectively, (P = 0.039). Fracture resistance in the BF (933.67 N) and BLF (874.01 N) groups was significantly higher than in the MF group (617.54 N) (P = 0.001). There was no significant difference between the MF, LF (722.89 N), and WF groups in terms of fracture resistance (P > 0.05). Conclusion Teeth with CF showed maximum fracture resistance. The location of the ferrule effects on the fracture resistance of maxillary premolars and also the mode of failure.
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Affiliation(s)
- Sara Koosha
- Department of Prosthodontics, School of Dentistry, Azad Islamic University, Tehran, Iran
| | | | - Azam S. Mostafavi
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
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Madfa AA. Effect of Dental Glass Fiber Posts on Root Stresses and Fracture Behavior of Endodontically Treated Maxillary Central Incisors: A Finite Element Analysis Study. Cureus 2023; 15:e43056. [PMID: 37680412 PMCID: PMC10480686 DOI: 10.7759/cureus.43056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/06/2023] [Indexed: 09/09/2023] Open
Abstract
OBJECTIVE In this work, the influence of glass fiber posts with different designs on the root stress that had endodontic treatment was examined using the finite element method. METHOD Using two distinct materials (metal and glass fiber) and two different prototypes (tapered and parallel-sided), four three-dimensional (3D) finite element models of an upper central incisor were made and studied. Each 3D model received an oblique loading of 100 N. All forces were dispatched as distributed pressure to the aforementioned region. There were no considerations made for potential stresses when performing the endodontic procedure. The endodontic treatment was conducted without taking into account any potential stressors. The root stresses were then recorded. RESULTS The largest tensile stress is often focused at the apical third of the post and post/cement contact, as well as at the coronal third of the root on both the labial and palatal sides of the root, independent of the post's design and material. Restoration of endodontically treated maxillary central incisors with glass fiber posts has been shown to have less stress concentration than titanium posts. Regardless of the post materials employed, the tapered post design generated a higher tensile stress distribution than the parallel side design. CONCLUSIONS Prefabricated fiber posts used in model restoration resulted in more evenly distributed stress and less concentrated stress on the root. Reduction in modulus of elasticity of post materials used generally shows less stress concentration.
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Affiliation(s)
- Ahmed A Madfa
- Department of Restorative Dental Science, College of Dentistry, University of Ha'il, Ha'il, SAU
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14
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Li F, Shao Y, Han T, Li J, Yan X. Finite element analysis of endodontically treated premolars without ferrule restored with one-piece glass fiber post and core in combination with different inner shoulder retention form systems. J Mech Behav Biomed Mater 2023; 143:105912. [PMID: 37270902 DOI: 10.1016/j.jmbbm.2023.105912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 05/12/2023] [Accepted: 05/14/2023] [Indexed: 06/06/2023]
Abstract
OBJECTIVE The current study was performed to explore the impact of post materials as well as the inner shoulder retention form (ISRF) design on the biomechanical behavior of endodontically treated premolars without ferrule restoration using a method of mathematical three-dimensional (3D) finite element analysis (FEA). METHODS Based on the tooth anatomy and our previous research, eight mandibular second premolar FEA models representing different restorative situations were built: teeth with (a) 2.0 mm height ferrule (DF), (b) no ferrule (NF), (c) 0.5 mm width and 0.5 mm depth ISRF (ISRFW0.5D0.5), (d) 0.5 mm width and 1.0 mm depth ISRF (ISRFW0.5D1.0), (e) 0.5 mm width and 1.5 mm depth ISRF (ISRFW0.5D1.5), (f) 1.0 mm width and 0.5 mm depth ISRF (ISRFW1.0D0.5), (g) 1.0 mm width and 1.0 mm depth ISRF (ISRFW1.0D1.0), (h) 1.0 mm width and 1.5 mm depth ISRF (ISRFW1.0D1.5). All groups were restored with prefabricated glass fiber post and resin composite core (PGF), one-piece glass fiber post-and-core (OGF) and cast Co-Cr alloy (Co-Cr) respectively, and the zirconia crown was restored. Load (180N) was subjected to the buccal cusp at 45° to the tooth's long axis. Stress pattern, maximum principal stress values (MPS), and maximum displacement values on root, post and core, cement layer were calculated for each model. RESULTS Stress distributions were similar while the values were different among groups. Regardless of restorative approaches, roots restored with PGF showed the highest MPS values, followed by OGF and Co-Cr groups. Regardless of post materials, NF groups resulted in the highest MPS values and maximum displacement values, while ISRF and DF groups exhibited similar results. Compared with PGF groups in association with ISRF, except for OGF with ISRFW0.5D0.5, the remaining OGF groups with ISRF and all Co-Cr groups in association with ISRF presented lower values than that of DF groups. And among different ISRF systems, roots restored with ISRFW1.0D1.0 presented the lowest stress (PGF: 32.96 MPa, OGF: 31.69 MPa, Co-Cr: 29.66 MPa). CONCLUSIONS For endodontically treated premolars without ferrule, restored with OGF in combination with ISRF preparation could effectively enhanced its load-bearing capacity. Furthermore, the ISRF with a depth and width of 1.0 mm is recommended.
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Affiliation(s)
- Feiming Li
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, No. 117 North Street Nanjing Road, Shenyang, 110002, Liaoning, China
| | - Ying Shao
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, No. 117 North Street Nanjing Road, Shenyang, 110002, Liaoning, China
| | - Tongtong Han
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, No. 117 North Street Nanjing Road, Shenyang, 110002, Liaoning, China
| | - Jian Li
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, No. 117 North Street Nanjing Road, Shenyang, 110002, Liaoning, China
| | - Xu Yan
- The VIP Department, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, No. 117 North Street Nanjing Road, Shenyang, 110002, Liaoning, China.
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Zhong Q, Cao X, Shen Y, Song Y, Wu Y, Qu F, Wang S, Xu C. Finite element analysis of maxillary first molar with mesial-occlusal-distal-palatal defect restored with different post-and-core strategies. Heliyon 2023; 9:e18131. [PMID: 37496905 PMCID: PMC10366429 DOI: 10.1016/j.heliyon.2023.e18131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 06/06/2023] [Accepted: 07/07/2023] [Indexed: 07/28/2023] Open
Abstract
Purpose To explore which restoration strategy generates the most favorable stress distribution in an endodontically-treated maxillary first molar with mesial-occlusal-distal-palatal defect. Methods Models with one post in palatal canal (PP), each post in palatal and distobuccal canals (PDP), each post in palatal and mesiobuccal canals (PMP), and each post in all canals (PDMP) were established for an endodontically-treated maxillary first molar with mesial-occlusal-distal-palatal defect either with fiber-reinforced composite (FRC) post or gold alloy cast (GAC) post. A 400-N vertical force and a 225-N lateral force were respectively applied. The Mohr-Coulomb stress ratio (σMC ratio) in the residual tooth structure (RTS), the resin cement, and the crowns, the tensile stress (σt) and compressive stress (σc) in the FRC posts, the von-Mises stress ratio (σvM ratio) in the GAC post-and-cores, and the σt and shear stress (σs) at the adhesive interfaces were calculated using finite element analysis. Results FRC posts generated lower σMC ratio than GAC posts in the RTS (0.3274-0.3643 vs. 0.3399-0.4118). Among the FRC post groups, the PDMP group got the lowest σs at the dentin-post interface (14.92 MPa) and the abutment-crown interface (8.242 MPa) under vertical loading, as well as the lowest σMC ratio in the RTS (0.3381) and the lowest σs at the dentin-post interface (38.00 MPa) under lateral loading. Conclusions From the point of stress distribution, placing FRC posts in the palatal, distobuccal, and mesiobuccal canals is the optimal strategy in restoring a severely damaged maxillary first molar, provided that lateral occlusal force is reduced.
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Affiliation(s)
- Qi Zhong
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Ximeng Cao
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Yingyi Shen
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Yingshuang Song
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Yaqin Wu
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Fang Qu
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
| | - Shaohai Wang
- Department of Stomatology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Chun Xu
- Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, College of Stomatology, Shanghai Jiao Tong University, National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China
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Muacevic A, Adler JR, Kanout S. Three-Dimensional Finite Element Study of Endodontically Treated Maxillary Central Incisors Restored Using Different Post and Crown Materials. Cureus 2023; 15:e33778. [PMID: 36798627 PMCID: PMC9925666 DOI: 10.7759/cureus.33778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2023] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND/PURPOSE Restoring endodontically treated teeth is a common problem in dental practice. Post and core restorations are one of the major options in the rehabilitation of these teeth. However, there is no final decision regarding the best material or technique to be used with these restorations. So, this study aimed to evaluate the effect of different post and crown materials on the biomechanical behavior of restored maxillary central incisor using the finite element method. MATERIALS AND METHODS A total of 10 3D models of endodontically treated maxillary central incisors restored with two prefabricated posts and three custom-made posts were modeled and grouped according to post material (gold, nickel-chrome, zirconia, and glass fiber) and crown material (lithium disilicate, and zirconia). Finite element analysis was conducted, and stress distribution was evaluated using von Mises criteria. RESULTS Both crown materials showed stress concentration at the force application site mainly on the intaglio palatal surface of the crown. However, more stress values were observed within zirconia crowns. All posts showed stress concentration at their buccal sides. However, more stress values were observed in zirconia and metal cast posts compared to glass fiber posts that transfer more stress to root dentin. CONCLUSIONS Post and crown materials affect the stress distribution in the tooth-restoration complex. Using high elastic modulus posts slightly decreased stress in root dentin despite concentrating more stress within their structure. However, glass fiber posts resulted in more homogenous stress distribution in the tooth-restoration complex. Crown material did not influence the stress distribution in root dentin. Custom-made posts decreased stress within crowns, regardless of the crown material. However, more stress values were observed within zirconia crowns. Custom-made zirconia posts and cores showed a similar stress distribution as non-precious metal cast posts, so they may be used as a suitable option where esthetic is desirable.
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Finite Element Study of PEEK Materials Applied in Post-Retained Restorations. Polymers (Basel) 2022; 14:polym14163422. [PMID: 36015679 PMCID: PMC9412468 DOI: 10.3390/polym14163422] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/06/2022] [Accepted: 08/12/2022] [Indexed: 11/30/2022] Open
Abstract
Background: This study aimed to investigate the biomechanical behaviors of polyether ether ketone (PEEK) and traditional materials (titanium and fiber) when used to restore tooth defects in the form of prefabricated post or customized post via computational modelling. Methods: First, the prototype of natural tooth, and the prototypes of prefabricated post and customized post were established, respectively, whilst the residual root was restored with dentin ferrule using reverse engineering methods. Then, the stress and strain of CFR-PEEK (PEEK reinforced by 30% carbon fiber) and pure PEEK (PEEK without any reprocessing) post were compared with those made in traditional materials using the three-dimensional finite element method. Results: From the stress point of view, compared with metal and fiber posts, CFR-PEEK and pure PEEK prefabricated post both demonstrated reduced post-core interface stress, post stress, post-root cement stress and root cement stress; moreover, CFR-PEEK and pure PEEK customized post demonstrated reduced post stress, post-root cement stress and root cement stress, while the strain of CFR-PEEK post was the closest to that of dentin. Conclusions: Compared with the traditional posts, both the CFR-PEEK and pure PEEK posts could reduce the risk of debonding and vertical root fracture, whether they were used as prefabricated posts or customized posts, but the biomechanical behavior of carbon fiber-reinforced CFR-PEEK restorations was the closest to dentin, no matter if they were used as prefabricated post or customized post. Therefore, the CFR-PEEK post could be more suitable to restore massive tooth defects. Pure PEEK needs filler reinforcement to be used for post-retained restoration.
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18
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Effect of Different Post Materials and Adaptability on Fracture Resistance and Fracture Mode in Human Endodontically Treated Teeth. Int J Dent 2022; 2022:9170081. [PMID: 35966224 PMCID: PMC9371825 DOI: 10.1155/2022/9170081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 07/12/2022] [Indexed: 11/17/2022] Open
Abstract
Objective. To investigate the effect of different post materials and adaptability on fracture resistance and fracture mode of endodontically treated teeth. Materials and Methods. Sixty extracted human mandibular premolars were selected and divided into 6 groups (n = 10) according to the restorative method after endodontic treatment: no ferrule presented and restored without fiber post (Group C), 2.0 mm ferrule presented and restored without fiber post (Group CF), restored with D.T. Light-Post (Group PDT), restored with anatomically customized D.T. Light-Post, relined with resin composite (Group ADT), restored with Hi-Rem prosthetic post (Group PHR), and restored with anatomically customized Hi-Rem prosthetic post, relined with resin composite (Group AHR). After restoring with core build-up materials, all specimens were loaded at 45° in a universal testing machine until failure. Visual inspection of all specimens for fracture modes was performed. The data were analyzed using one-way ANOVA, and the fracture mode was reviewed using the chi-square test. Results. Anatomically customized groups presented statistically significant higher fracture resistance than prefabricated groups and group C (
). Without post, group CF displayed significantly higher fracture resistance than group C (
). Group C, CF, PDT, and PHR showed some specimens with unfavorable fractures. Conclusions. Anatomically customized posts presented highest fracture resistance among all groups. There was no significant difference in fracture mode across all groups.
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Leandrin TP, Fernández E, Lima RO, Besegato JF, Escalante-Otárola WG, Kuga MC. Customized Fiber Post Improves the Bond Strength and Dentinal Penetrability of Resin Cementation System to Root Dentin. Oper Dent 2021; 47:E22-E34. [PMID: 34969119 DOI: 10.2341/20-117-l] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/02/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE This study aimed to evaluate the effect of fiber post customization on the bond strength (24 hours and 6 months), resin cement thickness, and dentinal penetrability of Adper Scotchbond Multi-Purpose - RelyX ARC (AS-RA), RelyX U200 (R2), and Scotchbond Universal - RelyX Ultimate (SU-RU) cementation systems to root dentin from the cervical-, middle-, and apical-thirds of the post space. METHODS One hundred twenty bovine incisors were endodontically treated. After post space preparation, the roots were divided into six groups, according to the luting protocols (AS-RA, R2, SU- RU) and the type of fiber post [noncustomized post (NC) and customized post (C)]. Customization procedures were peformed using a resin composite (Z350 XT). 24 hours (n=60) or 6 months later (n=60), specimens from the cervical-, middle-, and apical-thirds of the post space were submitted to cementation system thickness measurement, bond strength evaluation, and dentinal penetrability analysis with Confocal Laser Scanning Microscopy (CLSM). Failure mode was classified as adhesive, cohesive, or mixed. Data were submitted to ANOVA and Tukey tests (α=0.05). RESULTS Cementation protocols with customized fiber posts presented the lowest cementation system thickness, regardless of the cementation system or post space-third (p<0.05), and the highest bond strength values (p<0.05), regardless of the third space (p>0.05), for both periods (24 hours or 6 months). The comparison of push-out bond strength values between 24 hours and 6 months showed a reduction in all groups for the cervical-third (p<0.05). For the middle-third, only noncustomized groups showed reduction (p<0.05). For the apical-third, no reduction was observed (p>0.05). CONCLUSIONS Anatomical customization favored both the bond strength of cements to dentin and the dentinal penetrability, but with lower cementation system thickness, regardless of cement composition and adhesive strategy.
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Affiliation(s)
- T P Leandrin
- Thais Piragine Leandrin, DDS, MSc, PhD, Restorative Dentistry Department, Araraquara Dental School, Univ Estadual Paulista, Araraquara, São Paulo, Brazil
| | - E Fernández
- *Eduardo Fernández, DDS, PhD, Professor Titular, Universidad de Chile Facultad de Odontologia, Santiago, Chile and Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Providencia, Santiago, Chile
| | - R O Lima
- Reinaldo Oliveira Lima, DDS, MSc, PhD, Restorative Dentistry Department, Araraquara Dental School, Univ Estadual Paulista, Araraquara, São Paulo, Brazil
| | - J F Besegato
- João Felipe Besegato, DDS, MSc, PhD, Restorative Dentistry Department, Araraquara Dental School, Univ Estadual Paulista, Araraquara, São Paulo, Brazil
| | - W G Escalante-Otárola
- Wilfredo Gustavo Escalante-Otárola, DDS, MSc, PhD, NCCL Research Group, School of Dentistry, Faculty of Health Sciences, Jorge Basadre Grohmann National University-UNJBG, Tacna, Perú
| | - M C Kuga
- Milton Carlos Kuga, DDS, MSc, PhD, Restorative Dentistry Department, Araraquara Dental School, Univ Estadual Paulista, Araraquara, São Paulo, Brazil
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Santos Pantaleón D, Valenzuela FM, Morrow BR, Pameijer CH, García-Godoy F. Effect of Cervical Lesions on Fracture Resistance and Failure Mode of Maxillary Central Incisors Restored with Fiber Posts and Complete Crowns. Oper Dent 2021; 46:669-679. [PMID: 35507904 DOI: 10.2341/20-164-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2021] [Indexed: 11/23/2022]
Abstract
PURPOSE To investigate the effect of a cervical cavity extending 1 mm apical to the cemento-enamel junction (CEJ) on fracture resistance and failure mode of maxillary central incisors that have been treated endodontically, present with complete and incomplete ferrules, and are restored with and without a fiber post. METHODS AND MATERIALS 50 intact human maxillary central incisors were divided into five groups (n=10): CG (control group) 6-mm fer-rule height, no cervical cavity, and without post; (CO) 6-mm ferrule height without post, with a cervical cavity (access to root canal and cervical cavity restored with composite resin), cervical cavity; and post with ferrule heights of 1 mm (CP1), 2 mm (CP2), and 6 mm (CP6) restored with fiberglass post and composite resin core. After complete metal crowns were cemented on all specimens, they were subjected to thermal cycling (6000 cycles, 5°C/55°C), followed by immediate testing of fracture resistance. After failure, the specimens were sectioned buccolingually to evaluate and identify the mode of failure. The data were analyzed with an analysis of variance (ANOVA) and the Student-Newman-Keuls multiple comparison tests (α =0.05). RESULTS A 1-mm ferrule height (CP1) fracture resistance was significantly lower (531±125 N) compared to the 6-mm ferrule height (CP6) (769±175 N) (p<0.05). With respect to the groups with similar residual dentin, with and without a cervical cavity, CG (667±119 N) and CO (668±119 N), the presence of a post (CP6) increased the resistance to fracture, although no statistically significant difference was demonstrated. Partial decementation was observed in all specimens of CG and CP6, in nine of CP1 and CP2, and in three in CO. Root fractures occurred in 23 specimens. The root surface was exposed 2 mm below the CEJ to simulate bone level. Propagation of subosseous cracks occurred in four specimens in CG and CP2, in seven specimens in CP6, in two specimens in CP1, and in six specimens in CO. All were considered catastrophic failures. CONCLUSIONS Within the limitations of this study it is suggested that, when restoring an endodontically treated maxillary central incisor that has a cervical lesion and needs to be restored with a complete crown, a fiber post is cemented to improve fracture resistance.
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Affiliation(s)
- D Santos Pantaleón
- *Domingo Santos Pantaleón, DDS, MSD, PhD, professor (retired) of prosthodontics, School of Dentistry, Autonomous University of Santo Domingo, Santo Domingo, Dominican Republic
| | - F M Valenzuela
- Fabio M. Valenzuela, DDS, associate professor of prosthodontics, School of Dentistry, Autonomous University of Santo Domingo, Santo Domingo, Dominican Republic
| | - B R Morrow
- Brian R. Morrow, MS, research associate, Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - C H Pameijer
- Cornelis H. Pameijer, DMD, MScD, DSc, PhD, professor emeritus, Department of Reconstructive Sciences, University of Connecticut, Farmington, CT, USA
| | - F García-Godoy
- Franklin García-Godoy, DDS, MS, PhD, PhD, professor and director, Bioscience Research Center, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA, and Honorary Professor, School of Dentistry, Autonomous University of Santo Domingo, Santo Domingo, Dominican Republic
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KÜÇÜKEKENCİ AS, DEDE DÖ. Effect of tribochemical surface treatment technique on the push-out bond strength of novel CAD/CAM post restorations. CUMHURIYET DENTAL JOURNAL 2021. [DOI: 10.7126/cumudj.849157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Alihemmati M, Jafari S, Ghomi A, Shayegh S, Kargar K. Stress distribution of esthetic posts in the restored maxillary central incisor: Three-dimensional finite-element analysis. Dent Res J (Isfahan) 2021. [DOI: 10.4103/1735-3327.310039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Aslan T, Esim E, Üstün Y, Dönmez Özkan H. Evaluation of Stress Distributions in Mandibular Molar Teeth with Different Iatrogenic Root Perforations Repaired with Biodentine or Mineral Trioxide Aggregate: A Finite Element Analysis Study. J Endod 2020; 47:631-640. [PMID: 33245971 DOI: 10.1016/j.joen.2020.11.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 11/11/2020] [Accepted: 11/16/2020] [Indexed: 10/22/2022]
Abstract
INTRODUCTION In this study, finite element analysis was used to evaluate the stress distributions in simulated mandibular molar teeth with various iatrogenic root perforation types after reparation with Biodentine (Septodont, Saint-Maur-des-Fossés, France) or mineral trioxide aggregate (MTA). METHODS An extracted human mandibular molar tooth was scanned using a micro-computed tomographic device, and a 3-dimensional solid model was created. Then, 3 different iatrogenic perforation types (furcation perforation [FP], strip perforation [SP], and post drill perforation [PDP]) and 2 different repair materials (MTA and Biodentine [BD]) were simulated on the model. In addition, a sound tooth (ST) model (control) and a model left unrepaired for each type of perforation were created; then, access cavities were restored using resin composite, except for the sound tooth model. Consequently, a total of 10 experimental models were designed. An oblique force of 300 N angled at 45° to the occlusal plane was simulated. Evaluations of von Mises stress were performed in the perforated regions. RESULTS Maximum von Mises stress values were 7.76 MPa for ST/corresponding to the FP region, 8.48 MPa for ST/corresponding to the SP region, 14.20 MPa for ST/corresponding to the PDP region, 10.89 MPa for FP /MTA, 7.65 MPa for FP/BD, 14.67 MPa for FP/unrepaired, 15.92 MPa for SP/MTA, 15.82 MPa for SP/BD, 21.95 MPa for SP/unrepaired, 10.20 MPa for PDP/MTA, 9.17 MPa for PDP/BD, and 17.86 MPa for PDP/unrepaired. CONCLUSIONS The results of this finite element analysis indicated that BD models showed lower maximum von Mises stress values than the MTA models, and SPs exposed higher stress concentrations in root perforation regions than FPs and PDPs. The use of MTA and BD may reduce the risk of potentially harmful stress in root perforation regions.
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Affiliation(s)
- Tuğrul Aslan
- Department of Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey
| | - Emir Esim
- Department of Mechatronics Engineering, Faculty of Engineering, Erciyes University, Kayseri, Turkey
| | - Yakup Üstün
- Department of Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey
| | - Hicran Dönmez Özkan
- Department of Endodontics, Faculty of Dentistry, Aydın Adnan Menderes University, Aydın, Turkey.
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Li X, Kang T, Zhan D, Xie J, Guo L. Biomechanical behavior of endocrowns vs fiber post-core-crown vs cast post-core-crown for the restoration of maxillary central incisors with 1 mm and 2 mm ferrule height: A 3D static linear finite element analysis. Medicine (Baltimore) 2020; 99:e22648. [PMID: 33120754 PMCID: PMC7581096 DOI: 10.1097/md.0000000000022648] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
To analyze the stress distribution of the maxillary central incisor with oblique fracture, repaired by different methods, using 3-dimensional finite element analysis. From the biomechanical point of view, it is expected to provide a reference for clinical selection of restoration method which is more conducive to stress distribution and preservation of dental tissue as much as possible.Use cone beam CT and finite element software to establish the finite element models of the maxillary central incisor with oblique fracture, and then create models according to 5 repairing methods(A. fiber post-core-crown group; B. cast post-core-crown group; C.3 mm deep endocrown; D.4 mm deep endocrown; E.5 mm deep endocrown)after root canal treatment, and analyze the Von Mises equivalent stress and maximum principal stress distribution and peak value of each model.When the height of dentin ferrule was fixed, the value of the Von Mises equivalent stress and the maximum principal stress in residual tooth tissue: group A was the highest, and there was no significant difference in group B, C, D and E. And the stress distribution area of 5 groups were the same. In prosthodontic layer: group B was the highest, while group A was the lowest, and the stress peak slightly increased with the increase of depth in group C, D and E. And the 5 groups were with the same stress distribution area as well. In adhesive layer: group A was the highest, while group B was the lowest, and there was little difference among group C, D and E. Group A was concentrated in 1/3 of the post tip, while group B,C,D and E were concentrated in 1/3 of the post and the post tips.Complete and high enough dentin ferrule is a requirement for repairing heavily defected maxillary central incisor with fiber post-core crown and cast post-core crown. When the dentin ferrule is incomplete, the stress distribution of the endocrown is more excellent than post-core-crown. And the endocrown with a depth of 3 mm retainer may be the best repair method. As for post-core crown restoration, the cast post-core crown is more favorable for the uniform distribution of residual tooth tissue than the fiber post-core crown.
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Affiliation(s)
- Xixi Li
- Department of prosthodontics, Hospital of Stomatology Affiliated to Southwest Medical University, Luzhou
- Department of Stomatology, The First People's Hospital of Shuangliu District
| | - Ting Kang
- Chengdu Second People's Hospital, Chengdu
| | - Danting Zhan
- Department of prosthodontics, Hospital of Stomatology Affiliated to Southwest Medical University, Luzhou, China
| | - Jing Xie
- Department of prosthodontics, Hospital of Stomatology Affiliated to Southwest Medical University, Luzhou, China
| | - Ling Guo
- Department of prosthodontics, Hospital of Stomatology Affiliated to Southwest Medical University, Luzhou, China
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Silva-Sousa AC, Moris ICM, Barbosa AFS, Silva-Sousa YTC, Sousa-Neto MD, Pires CRF, Gomes EA. Effect of restorative treatment with endocrown and ferrule on the mechanical behavior of anterior endodontically treated teeth: An in vitro analysis. J Mech Behav Biomed Mater 2020; 112:104019. [PMID: 32829166 DOI: 10.1016/j.jmbbm.2020.104019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 10/23/2022]
Abstract
This study evaluated the effect of endocrown and ferrule restorative treatment on the mechanical behavior of anterior endodontically treated teeth. Human canines were treated endodontically and distributed in five groups (n = 10): sound teeth (S), crown associated with glass fiber post (GFP) and ferrule (GFPf+) and that without ferrule (GFPf-), and endocrown with ferrule (Ef+) and that without ferrule (Ef-). The crowns were obtained in lithium disilicate-based glass ceramic and cemented with resin. Thermomechanical loading (TL) was performed with progressive load of 80, 120, 160, 200, 240, 280, and 320 N with 20,000 cycles each, 140,000 cycles in total, frequency of 5 Hz, and temperature variation of 5°C-55 °C, followed by fracture resistance testing with load cell of 1000 Kgf and crosshead speed of 0.5 mm/min in a universal testing machine. Failure mode has been evaluated. Data were compared by Kaplan-Meier survival analysis (p < 0.05) for TL and one-way ANOVA and Tukey's test (p < 0.05) for fracture resistance. TL showed higher number of fractures for groups without ferrule (GFPf- = 7, GFPf+ = 3, Ef- = 10, and Ef+ = 2) and lower mean fracture load probability (GFPf+ = 300 N, GFPf- = 280 N, Ef+ = 320 N, Ef- = 188 N) than those with ferrule. Regarding fracture, teeth rehabilitated with GFP were more resistant to endocrowns with ferrule (p < 0.05). A higher percentage of type III failures after fatigue and type II failures after fracture were found. In conclusion, rehabilitation using GFP with ferrule is more favorable for anterior teeth, but the use of endocrown with ferrule proved feasible.
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Affiliation(s)
- Alice Corrêa Silva-Sousa
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil; Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Izabela C M Moris
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil
| | | | | | - Manoel Damião Sousa-Neto
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Cassiano Ricardo Ferreira Pires
- Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto, SP, Brazil
| | - Erica Alves Gomes
- School of Dentistry, University of Ribeirão Preto (UNAERP), Ribeirão Preto, SP, Brazil.
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Camargos GDV, Lazari-Carvalho PC, Carvalho MAD, Castro MB, Neris NW, Del Bel Cury AA. 3D finite element model based on CT images of tooth. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8658910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: This study aimed the description of a protocol to acquire a 3D finite element (FE) model of a human maxillary central incisor tooth restored with ceramic crowns with enhanced geometric detail through an easy-to-use and low-cost concept and validate it through finite element analysis (FEA). Methods: A human maxillary central incisor was digitalized using a Cone Beam Computer Tomography (CBCT) scanner. The resulted tooth CBCT DICOM files were imported into a free medical imaging software (Invesalius) for 3D surface/geometric reconstruction in stereolithographic file format (STL). The STL file was exported to a computer-aided-design (CAD) software (SolidWorks), converted into a 3D solid model and edited to simulate different materials for full crown restorations. The obtained model was exported into a FEA software to evaluate the influence of different core materials (zirconia - Zr, lithium disilicate - Ds or palladium/silver - Ps) on the mechanical behavior of the restorations under a 100 N applied to the palatal surface at 135 degrees to the long axis of the tooth, followed by a load of 25.5 N perpendicular to the incisal edge of the crown. The quantitative and qualitative analysis of maximum principal stress (ceramic veneer) and maximum principal strain (core) were obtained. Results: The Zr model presented lower stress and strain concentration in the ceramic veneer and core than Ds and Ps models. For all models, the stresses were concentrated in the external surface of the veneering ceramic and strains in the internal surface of core, both near to the loading area. Conclusion: The described procedure is a quick, inexpensive and feasible protocol to obtain a highly detailed 3D FE model, and thus could be considered for future 3D FE analysis. The results of numerical simulation confirm that stiffer core materials result in a reduced stress concentration in ceramic veneer.
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Calabro DE, Kojima AN, Gallego Arias Pecorari V, Helena Coury Saraceni C, Blatz MB, Özcan M, Mikail Melo Mesquita A. A 10-Year Follow-Up of Different Intra-Radicular Retainers in Teeth Restored with Zirconia Crowns. Clin Cosmet Investig Dent 2019; 11:409-417. [PMID: 31920401 PMCID: PMC6938187 DOI: 10.2147/ccide.s228966] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 11/20/2019] [Indexed: 11/27/2022] Open
Abstract
Purpose To evaluate the survival rate in restored teeth with three different types of retainers prior to the fixing of crowns with zirconia through this retrospective clinical study. It is unclear how the type of post and core rehabilitation, and type of resin cement affect the longevity of teeth restored with crowns. Methods In a private clinic, a total of 101 retainers installed by the same professional between June 2008 and January 2018, with an average time of 58.2 months (4.8 years), were analyzed regarding the following factors: survival, cement and failure type. Three types of retainers were used according to the indications found in the literature: filling with Z250 light-cured composite resin, 22 elements; fiberglass post with Z250 light-cured composite resin, 45 elements; and cast metallic core in silver-tin alloy, 34 elements. The retainers were cemented with chemically cured cement, U100, U200, or Panavia F. Results Data were subjected to Kaplan-Meier analysis (p=0.495). Although the study presented several limitations, no significant differences were observed in the success rates between the types of intra-radicular retainers and the type of cement. The success rates were as follows: metal core, 97.1%; fiberglass post, 95.6%; and filling, 100%. On average, failures occurred at 48.4 months. Conclusion In view of the results, it is possible to conclude that the different retainers evaluated have similar survival rates. ![]()
Point your SmartPhone at the code above. If you have a QR code reader the video abstract will appear. Or use: https://youtu.be/QKIn3RiFx_Y
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Affiliation(s)
- Debora E Calabro
- Department of Prosthodontics, Paulista University (UNIP) São Paulo, São Paulo, Brazil
| | - Alberto N Kojima
- Department of Dental Materials and Prosthodontics, Paulista State University (UNESP) São José, São Paulo, Brazil
| | | | | | - Markus B Blatz
- Unit Center for Dental and Oral Medicine Clinic for Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland
| | - Mutlu Özcan
- Professor, Department of Preventive and Restorative Sciencie, University of Pennsylvania, Philadelphia, PA, USA
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Shaikh SY, Mulani S, Shaikh SS. Stress Distribution on Root Dentin Analogous to Natural Teeth with Various Retentive Channels Design on the Face of the Root with Minimal or No Coronal Tooth Structure: A Finite Element Analysis. Contemp Clin Dent 2019; 9:630-636. [PMID: 31772476 PMCID: PMC6868623 DOI: 10.4103/ccd.ccd_536_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Aim: The aim of this study was to evaluate post-core design on Stress distribution in maxillary central incisor with various designs retentive channels placed on the face of the root with no remaining coronal tooth structure. Materials and Methods: 3 dimensional finite element model of a maxillary central incisor was developed and seven other study modes were developed. Tooth was scanned using CBCT unit, with reverse engineering software. 3D wire mesh, with ten node tetrahedral element, developed was transferred to ANASYS software. Composite was used for post-core-crown as post endodontic restoration. Mechanical properties were assigned to each component for FEA. All the materials were assumed to be isotropic, linearly elastic, homogenous and tightly bonded. A load of 100N were applied from vertical, horizontal and lateral oblique from incisal and palatal surface respectively. Results: Analysis revealed that stresses were concentrated at the point of load application on crown(vertical(V) 14.35MPa, horizontal(H) 27.04 MPa and lateral oblique(L)13.75MPa) and depending on the post core design the stresses were homogenous evenly distributed over the root dentin, core and least over the post. There was variation in stress distribution under vertical horizontal and lateral oblique load. Conclusion: Teeth with no remaining coronal structure and by placing retentive channels on the face of the root will enable homogenous stress distribution, promote mechanical retention and stability to the post core crown post endodontic restoration.
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Affiliation(s)
- Shoeb Yakub Shaikh
- Department of Conservative Dentistry, Pravara Institute of Medical Sciences, Rural Dental College, Loni, Maharashtra, India
| | - Shahnawaz Mulani
- Department of Prosthodontics, Aditya Dental College, Beed, Maharashtra, India
| | - Safia Shoeb Shaikh
- Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Qassim University, Buraidah, Kingdom of Saudi Arabia
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Barbosa Kasuya AV, Favarão IN, Machado AC, Rezende Spini PH, Soares PV, Fonseca RB. Development of a fiber-reinforced material for fiber posts: Evaluation of stress distribution, fracture load, and failure mode of restored roots. J Prosthet Dent 2019; 123:829-838. [PMID: 31590983 DOI: 10.1016/j.prosdent.2019.04.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 04/26/2019] [Accepted: 04/26/2019] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM The biomechanical behavior of post-restored roots with an experimental fiber-reinforced composite resin is unknown. PURPOSE The purpose of this in vitro study was to investigate the biomechanical behavior of an experimental composite resin (3-mm short glass fiber incorporated in methacrylate matrix with filler particles) used to produce the custom post itself or to reline fiber posts. MATERIAL AND METHODS Four testing groups (n=10) were created according to the root restoration method: FG, commercially available fiber post; FG+RC, fiber post relined with conventional composite resin; FG+EXP, fiber post relined with the experimental composite resin; and EXP, a custom post made of experimental composite resin. A three-dimensional finite element linear elastic analysis was performed by using geometric representations of groups, and the results were analyzed by von Mises (σvM) and maximum principal stress criteria. In sequence, 40 bovine incisors were assigned to these groups and subjected to a fracture load test (Instron 5965; 0.5 mm/min), and the failure mode was determined. RESULTS The EXP group showed more homogeneous stress distribution for σvM. ANOVA and the Tukey honestly significant difference (HSD) tests showed significant differences (P<.001) in fracture load (mean ±standard deviation; different superscript letters indicate statistical difference): FG+EXP (669.5 ±107.7)A; FG (620.7 ±59.2)A; EXP (506.5 ±27.0)B; FG+RC (452.7 ±81.6)B. No differences were found for failure mode (P=.595). CONCLUSIONS The experimental composite resin significantly increases fracture load when used to reline commercially available fiber posts and, irrespective of its use, presented lower stress concentration.
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Affiliation(s)
- Amanda Vessoni Barbosa Kasuya
- Professor, Department of Operative Dentistry, Dental School, University of West Paulista (UNOESTE), Presidente Prudente, Brazil.
| | - Isabella Negro Favarão
- Doctoral student, Departament of Operative Dentistry and Dental Materials, Dental School, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Alexandre Coelho Machado
- Doctoral student and NCCL research group member, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Pedro Henrique Rezende Spini
- NCCL research group member, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Paulo Vinícius Soares
- Professor and NCCL research group coordinator, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Rodrigo Borges Fonseca
- Professor, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Goiás (UFG), Goiânia, Brazil
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Dartora G, Rocha Pereira GK, Varella de Carvalho R, Zucuni CP, Valandro LF, Cesar PF, Caldas RA, Bacchi A. Comparison of endocrowns made of lithium disilicate glass-ceramic or polymer-infiltrated ceramic networks and direct composite resin restorations: fatigue performance and stress distribution. J Mech Behav Biomed Mater 2019; 100:103401. [PMID: 31445400 DOI: 10.1016/j.jmbbm.2019.103401] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/14/2019] [Accepted: 08/19/2019] [Indexed: 11/15/2022]
Abstract
This study compared the fatigue performance and the stress distribution of endodontically treated molars restored with endocrowns obtained with lithium disilicate glass-ceramic or a polymer-infiltrated ceramic network, both processed by CAD-CAM, and direct composite restorations. Forty-eight human mandibular molars were randomly assigned into 03 groups (n = 16) and restored with endocrowns (LD - lithium disilicate glass-ceramic or PICN - polymer-infiltrated ceramic network) or with direct composite restorations. Fatigue testing followed a step-stress approach (initial maximum load of 200 N and 5000 cycles, incremental step load of 200N and 10,000 cycles/step, being the specimens loaded until failure or to a maximum of 135,000 cycles at 2800 N). The fatigue failure load and number of cycles until failure were recorded and statistically analyzed. Fractographic and finite element (FEA) analyzes were conducted as well. There were no differences in fatigue failure load, number of cycles until fracture and mean survival probabilities among groups. However, indirect endocrowns had higher mechanical structural reliability, and LD restorations lasted more time before start to failing. FEA showed that the stress concentration in tooth tissues was higher for the resin composite, followed by PICN and LD in a decreasing order. Almost all fractures were restricted to the restorative material (without tooth involvement), and origins were identified at occlusal surface. The type of restoration did not influence the fatigue failure load, number of cycles until fracture and mean survival probabilities of the restorative strategies. Despite that, the mechanical structural reliability of endocrowns, especially those made of lithium disilicate, was higher and lasted more time before start to failing.
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Affiliation(s)
- Gustavo Dartora
- MSciD Post-Graduate Program in Dentistry, Meridional Faculty, IMED, Passo Fundo, Brazil.
| | | | | | - Camila Pauleski Zucuni
- MSciD and PhD Post-Graduate Program in Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
| | - Luiz Felipe Valandro
- MSciD and PhD Post-Graduate Program in Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
| | - Paulo Francisco Cesar
- Department of Biomaterials and Oral Biology, University of São Paulo, USP, São Paulo, Brazil.
| | | | - Atais Bacchi
- MSciD Post-Graduate Program in Dentistry, Meridional Faculty, IMED, Passo Fundo, Brazil.
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Pang J, Feng C, Zhu X, Liu B, Deng T, Gao Y, Li Y, Ke J. Fracture behaviors of maxillary central incisors with flared root canals restored with CAD/CAM integrated glass fiber post-and-core. Dent Mater J 2019; 38:114-119. [PMID: 30381631 DOI: 10.4012/dmj.2017-394] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The objective was to evaluate the fracture resistance properties of maxillary incisors with flared canals restored with computer aided design and computer aided manufacture (CAD/CAM) integrated glass fiber post-and-core. Thirty prepared flared root canals were selected in vitro and restored with CAD/CAM integrated fiber post-and-core (Group A), prefabricated fiber posts (Group B), and cast gold alloy (Group C), respectively. After submitted to fatigue loading, each specimen was subjected to a static loading until fracture. Analysis of variance (ANOVA) tests were used to determine statistical differences. The mean fracture strengths of Groups A and C were significantly higher than those of Group B, whereas no differences were observed between Groups A and C. In addition, reparable fracture modes were mostly observed in Group A while irreparable and catastrophic fractures were mostly found in Groups B and C. These results demonstrate that, in comparison to traditional treatments, CAD/CAM integrated glass fiber post-and-core restoration significantly enhances the fracture resistance of flared root canals.
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Affiliation(s)
- Jianliang Pang
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Changfen Feng
- Comprehensive Department of Stomatology, Suzhou Dental Hospital
| | - Xiaoru Zhu
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Bing Liu
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Tianzheng Deng
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Yuan Gao
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Ying Li
- Department of Stomatology, The General Hospital of the Air Force P.L.A
| | - Jie Ke
- Department of Stomatology, The General Hospital of the Air Force P.L.A
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Soares CJ, Rodrigues MDP, Faria-e-Silva AL, Santos-Filho PCF, Veríssimo C, Kim HC, Versluis A. How biomechanics can affect the endodontic treated teeth and their restorative procedures? Braz Oral Res 2018; 32:e76. [DOI: 10.1590/1807-3107bor-2018.vol32.0076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 06/13/2018] [Indexed: 11/22/2022] Open
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Caldas RA, Bacchi A, Barão VA, Versluis A. Should adhesive debonding be simulated for intra-radicular post stress analyses? Dent Mater 2018; 34:1331-1341. [DOI: 10.1016/j.dental.2018.06.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 05/11/2018] [Accepted: 06/07/2018] [Indexed: 11/16/2022]
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Ferreira MBDC, Carlini-Júnior B, Silva-Sousa YT, Gomes ÉA, Spazzin AO. Pino de fibra de vidro anatômico: relato de caso. JOURNAL OF ORAL INVESTIGATIONS 2018. [DOI: 10.18256/2238-510x.2018.v7i1.2161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Introdução: Pinos pré-fabricados de fibra de vidro possuem boas propriedades mecânicas e estéticas. Porém, estes podem não se adaptar bem em canais amplos ou excessivamente cônicos, prejudicando sua retenção ao canal radicular. Uma alternativa para esta desvantagem é a utilização da técnica de pino anatômico. Objetivo: O objetivo do relato de caso foi apresentar a técnica de confecção de um pino fibra de vidro anatômico em dente anterior, com reduzido remanescente coronário e ampla embocadura do canal radicular. Relato de Caso: Paciente masculino, 49 anos, procurou atendimento odontológico com queixa da aparência estética de seus dentes anteriores superiores. Após remoção de uma coroa metalocerâmica e um pino-núcleo metálico fundido do elemento 12, foram confeccionados um pino de fibra de vidro anatômico, núcleo de preenchimento e coroa provisória. Foram realizadas as facetas em resina composta nos elementos 13, 11, 21, 22 e 23. Uma coroa de cerâmica reforçada por dissilicato de lítio (IPS e.max CAD, Ivoclar Vivadent) foi cimentada no elemento 12. Conclusões: Através da técnica pino de fibra de vidro anatômico, é possível reabilitar dentes anteriores tratados endodonticamente sem a utilização de pinos metálicos, apresentando bons resultados estéticos. Entretanto, uma condição oclusal dentro dos princípios de uma oclusão mutuamente protegida deve ser almejada para garantir longevidade da restauração.
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Gerogianni P, Lien W, Bompolaki D, Verrett R, Haney S, Mattie P, Johnson R. Fracture Resistance of Pressed and Milled Lithium Disilicate Anterior Complete Coverage Restorations Following Endodontic Access Preparation. J Prosthodont 2018; 28:163-170. [PMID: 29682833 DOI: 10.1111/jopr.12798] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/17/2018] [Indexed: 11/26/2022] Open
Abstract
PURPOSE This in vitro study evaluated the fracture resistance and clinical prognosis of anterior lithium disilicate crowns (e.max Press and e.max CAD), following endodontic access and repair. The research design simulates intraoral loading conditions to produce clinically applicable results. MATERIALS AND METHODS Monolithic anterior crowns, based on #8 anatomy, were fabricated from e.max Press ingots and e.max CAD blocks and adhesively bonded on identical dies milled out of a dentin analog material (NEMA G10). Specimens were divided into 4 groups: intact pressed, repaired pressed, intact milled, and repaired milled (n = 15/group). Repaired pressed and repaired milled were prepared with a standardized endodontic access and repaired using a porcelain repair system and composite resin. All crowns were cyclically loaded under simulated oral conditions and then loaded to failure in water, using a universal testing machine. Data were interpreted using ANOVA/Tukey post-hoc test (α = 0.05). RESULTS Mean loads to failure ranged from 758.9 to 931.4 N for the 4 groups, indicating that both fabrication techniques, pressed and milled, yielded restorations that could reasonably withstand maximum masticatory forces. The pressed groups (923.7 N) exhibited significantly higher fracture resistance than the milled groups (797.5 N), p = 0.0002. When milled and pressed groups were categorized into intact and repaired subgroups, no difference was found in fracture resistance between the subgroups. Differences were noted in the modes of fracture, where the milled groups (intact and repaired) exhibited higher frequency of catastrophic fractures than the pressed groups. CONCLUSIONS Endodontic access preparation does not appear to affect fracture resistance of an anterior lithium disilicate restoration, suggesting that replacement may not be necessary. Fabrication technique had a significant effect on fracture resistance and fracture mode of lithium disilicate restorations. The pressed fabrication technique resulted in significantly greater crown strength and fracture resistance than the milled technique.
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Affiliation(s)
- Petrina Gerogianni
- Department of Comprehensive Dentistry, Graduate School of Biomedical Sciences, University of Texas Health Science Center at San Antonio, TX
| | - Wen Lien
- US Air Force Dental Evaluation & Consultation Service - Dental Materials Research San Antonio, TX
| | - Despoina Bompolaki
- Department of Restorative Dentistry, Oregon Health and Science University School of Dentistry, Portland, OR
| | - Ronald Verrett
- Department of Comprehensive Dentistry, Graduate School of Biomedical Sciences, University of Texas Health Science Center at San Antonio, TX
| | - Stephan Haney
- Department of Comprehensive Dentistry, Graduate School of Biomedical Sciences, University of Texas Health Science Center at San Antonio, TX
| | - Patrick Mattie
- Department of Comprehensive Dentistry, Graduate School of Biomedical Sciences, University of Texas Health Science Center at San Antonio, TX
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Evaluation of Different Restoration Combinations Used in the Reattachment of Fractured Teeth: A Finite Element Analysis. Appl Bionics Biomech 2018; 2018:8916928. [PMID: 29736185 PMCID: PMC5875023 DOI: 10.1155/2018/8916928] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 01/28/2018] [Indexed: 11/18/2022] Open
Abstract
Objective. The purpose of this study was to test different restoration combinations used for constructing fractured endodontically treated incisors by reattaching their fractured fragments. Methods. Seven types of 3-D FEM mathematical root canal-filled models were generated, simulating cases of (OB) reattaching fractured fragments; (CrPL) reattaching fractured fragments + ceramic palatinal laminate; (CmPL) reattaching fractured fragments + composite palatinal laminate; (CM) reattaching fractured fragments + coronal 1/3 of the root was filled using core material; (BP) reattaching fractured fragments + glass fiber post; (CP) composite resin restoration + glass fiber post; and (OC) composite resin restoration. A 100-N static oblique force was applied to the simulated teeth with 135° on the node at 2 mm above the cingulum to analyze the stress distribution at the tooth. Results. For enamel tissue, the highest stress values were observed in model BP, and the lowest stress values were observed in model CmPL. For dentine tissue, the highest stress concentrations were observed around the fracture line for all models. Conclusions. Reattachment of fractured fragments by bonding may be preferred as a restoration option for endodontically treated incisors; also, palatinal laminate decreases the stress values at tooth tissues, especially at the enamel and the fracture line.
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Moris ICM, Moscardini CA, Moura LKB, Silva-Sousa YTC, Gomes EA. Evaluation of Stress Distribution in Endodontically Weakened Teeth Restored with Different Crown Materials: 3D-FEA Analysis. Braz Dent J 2017; 28:715-719. [PMID: 29211127 DOI: 10.1590/0103-6440201701829] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 10/11/2017] [Indexed: 11/22/2022] Open
Abstract
This study evaluated the stress distribution in endodontically treated teeth, weakened (W) or not weakened (NW), restored with different materials of prosthetic crown using 3D-FEA. Models of a maxillary canine were constructed based on micro-CT images and divided into the groups: G1 (control) - sound tooth; G2 to G7 - endodontically treated teeth restored with glass fiber post (GFP); which G2 to G4 simulated NW root and G5 to G7 simulated W root. For crown material the teeth were restored with: G2 and G5: metallic coping and ceramic veneering, G3 and G6: zirconia coping and ceramic veneering, G4 and G7: alumina coping and ceramic veneering. Load of 180 N was applied at the incisal third of lingual surface at 45º. Models were supported by the periodontal ligament (x=y=z=0). The von Mises stress (VMS) values were calculated. The W teeth presented higher VMS at coping when compared to NW teeth and group G1 showed lower VMS value. For crown material, for both W or NW teeth, increasing VMS was found at metallic, zirconia and alumina coping, respectively. Metallic coping showed a better performance despite its unfavorable esthetics, suggesting as an appropriate material for prosthetic restoration of endodontically treated teeth.
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Affiliation(s)
- Izabela C M Moris
- Dental School, UNAERP - Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | | | | | | | - Erica Alves Gomes
- Dental School, UNAERP - Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil
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Poletto D, Poletto AC, Cavalaro A, Machado R, Cosme-Silva L, Garbelini CCD, Hoeppner MG. Smear layer removal by different chemical solutions used with or without ultrasonic activation after post preparation. Restor Dent Endod 2017; 42:324-331. [PMID: 29142881 PMCID: PMC5682149 DOI: 10.5395/rde.2017.42.4.324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Accepted: 10/07/2017] [Indexed: 11/11/2022] Open
Abstract
Objectives This study evaluated smear layer removal by different chemical solutions used with or without ultrasonic activation after post preparation. Materials and Methods Forty-five extracted uniradicular human mandibular premolars with single canals were treated endodontically. The cervical and middle thirds of the fillings were then removed, and the specimens were divided into 9 groups: G1, saline solution (NaCl); G2, 2.5% sodium hypochlorite (NaOCl); G3, 2% chlorhexidine (CHX); G4, 11.5% polyacrylic acid (PAA); G5, 17% ethylenediaminetetraacetic acid (EDTA). For the groups 6, 7, 8, and 9, the same solutions used in the groups 2, 3, 4, and 5 were used, respectively, but activated with ultrasonic activation. Afterwards, the roots were analyzed by a score considering the images obtained from a scanning electron microscope. Results EDTA achieved the best performance compared with the other solutions evaluated regardless of the irrigation method (p < 0.05). Conclusions Ultrasonic activation did not significantly influence smear layer removal.
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Affiliation(s)
- Daniel Poletto
- Department of Restorative Dentistry, Londrina State University (UEL), Londrina, PR, Brazil
| | | | - Andressa Cavalaro
- Clinical Practice Limited to Esthetic Dentistry, Campo Grande, MS, Brazil
| | - Ricardo Machado
- Clinical Practice Limited to Endodontics, Navegantes, SC, Brazil
| | - Leopoldo Cosme-Silva
- Department of Endodontics, São Paulo State University (UNESP) School of Dentistry, Araçatuba, SP, Brazil
| | | | - Márcio Grama Hoeppner
- Department of Restorative Dentistry, Londrina State University (UEL), Londrina, PR, Brazil
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Verri FR, Okumura MHT, Lemos CAA, Almeida DADF, de Souza Batista VE, Cruz RS, Oliveira HFF, Pellizzer EP. Three-dimensional finite element analysis of glass fiber and cast metal posts with different alloys for reconstruction of teeth without ferrule. J Med Eng Technol 2017; 41:644-651. [DOI: 10.1080/03091902.2017.1385655] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Fellippo Ramos Verri
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Marlice Hayumi Theles Okumura
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Cleidiel Aparecido Araujo Lemos
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Daniel Augusto de Faria Almeida
- Department of Operative Dentistry, School of Dentistry, Federal University of Alfenas – UNIFAL, Alfenas, Minas Gerais, Brazil
| | - Victor Eduardo de Souza Batista
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Ronaldo Silva Cruz
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Hiskell Francine Fernandes Oliveira
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
| | - Eduardo Piza Pellizzer
- Department of Dental Materials and Prosthodontics, Aracatuba Dental School, UNESP – Universidad Estadual Paulista, Campus of Aracatuba, Sao Paulo, Brazil
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Zeola LF, Pereira FA, Machado AC, Reis BR, Kaidonis J, Xie Z, Townsend GC, Ranjitkar S, Soares PV. Effects of non-carious cervical lesion size, occlusal loading and restoration on biomechanical behaviour of premolar teeth. Aust Dent J 2017; 61:408-417. [PMID: 26671647 DOI: 10.1111/adj.12391] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/06/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND Information on fracture biomechanics has implications in materials research and clinical practice. The aim of this study was to analyse the influence of non-carious cervical lesion (NCCL) size, restorative status and direction of occlusal loading on the biomechanical behaviour of mandibular premolars, using finite element analysis (FEA), strain gauge tests and fracture resistance tests. METHODS Ten buccal cusps were loaded on the outer and inner slopes to calculate the strain generated cervically. Data were collected for healthy teeth at baseline and progressively at three lesion depths (0.5 mm, 1.0 mm and 1.5 mm), followed by restoration with resin composite. The magnitude and distribution of von Mises stress and maximum principal stress were simulated at all stages using FEA, and fracture strength was also determined (n = 7 per group). RESULTS There were significant effects of the lesion size and loading directions on stress, strain and fracture resistance (p < 0.05). Fracture resistance values decreased with increase in lesion size, but returned to baseline with restorations. CONCLUSIONS Combined assessment of computer-based and experimental techniques provide an holistic approach to characterize the biomechanical behaviour of teeth with both unrestored and restored NCCLs.
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Affiliation(s)
- L F Zeola
- Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Brazil
| | - F A Pereira
- Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Brazil
| | - A C Machado
- Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Brazil
| | - B R Reis
- Federal University of Uberlandia, Brazil
| | - J Kaidonis
- School of Mechanical Engineering, The University of Adelaide, South Australia, Australia
| | - Z Xie
- School of Dentistry, The University of Adelaide, South Australia, Australia
| | - G C Townsend
- School of Mechanical Engineering, The University of Adelaide, South Australia, Australia
| | - S Ranjitkar
- School of Mechanical Engineering, The University of Adelaide, South Australia, Australia
| | - P V Soares
- Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Brazil
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Rodrigues MDP, Soares PBF, Valdivia ADCM, Pessoa RS, Veríssimo C, Versluis A, Soares CJ. Patient-specific Finite Element Analysis of Fiber Post and Ferrule Design. J Endod 2017; 43:1539-1544. [DOI: 10.1016/j.joen.2017.04.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 04/19/2017] [Accepted: 04/22/2017] [Indexed: 11/26/2022]
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MARCHIONATTI AME, VALLI V, WANDSCHER VF, MONACO C, BALDISSARA P. Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns. REVISTA DE ODONTOLOGIA DA UNESP 2017. [DOI: 10.1590/1807-2577.01617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Abstract Objective This study aimed to evaluate the fracture load and displacement of roots restored with posts of different elastic modulus. Material and method Thirty-six replicas of epoxy resin mixed with glass microfibers were made from an endodontically-treated human premolar root prepared to a length of 12 mm with a custom drill, leaving the apical 4 mm unprepared. Replicas were randomly restored with (n = 12): FP-LM (fiber post with low elastic modulus– 50 GPa), FP-HM (fiber post with high elastic modulus – 67 GPa) and MP (metallic post – 208 GPa), using self-curing adhesive and dual resin cement. Cores were built up with composite resin and metallic crowns were cemented in all the roots with self-adhesive resin cement with self-curing mode. Specimens were subjected to a fracture load test (45° inclination/0.5 mm/min) and displacement was registered at 100 N. Result One-way ANOVA showed that elastic modulus of the post did not affect the fracture load means (p = 0.203) (FP-LM: 237.4 ± 65.11 N; FP-HM: 236.7 ± 92.85 N; MP: 295.8 ± 108.7 N) but was statistically significant for the displacement (p < 0.00): Tukey’s test showed that FP-LM displacement mean (0.81 ± 0.15 mm) was significantly higher than those for FP-HM (0.46 ± 0.26 mm; p = 0.00) and MP (0.62 ± 0.07 mm; p = 0.04). Conclusion Posts with different elastic modulus exhibit similar fracture loads, but a lower displacement is achieved when fiber posts with a high elastic modulus and metallic posts are used.
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Maroli A, Hoelcher KAL, Reginato VF, Spazzin AO, Caldas RA, Bacchi A. Biomechanical behavior of teeth without remaining coronal structure restored with different post designs and materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:839-844. [DOI: 10.1016/j.msec.2017.03.152] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Revised: 03/13/2017] [Accepted: 03/14/2017] [Indexed: 11/16/2022]
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Guldener KA, Lanzrein CL, Siegrist Guldener BE, Lang NP, Ramseier CA, Salvi GE. Long-term Clinical Outcomes of Endodontically Treated Teeth Restored with or without Fiber Post-retained Single-unit Restorations. J Endod 2016; 43:188-193. [PMID: 27939825 DOI: 10.1016/j.joen.2016.10.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 09/14/2016] [Accepted: 10/10/2016] [Indexed: 12/11/2022]
Abstract
INTRODUCTION The aim of the present study was to evaluate both survival and failure rates of endodontically treated teeth restored with or without fiber post-retained restorations after a mean observation period of at least 5 years. METHODS A total of 144 single-rooted and multirooted teeth in 100 subjects were endodontically treated following a predetermined aseptic protocol and restored with either a fiber post and a composite core or a composite filling without intraradicular retention. A fiber post was cemented when the teeth presented with only 1 wall and/or less than one third of the remaining height of the clinical crown. After a comprehensive treatment plan, the teeth were restored with either a direct composite restoration or a single-unit crown. Endodontically treated teeth supporting fixed and removable dental prostheses and telescopic crowns were excluded from the analysis. Success was defined as tooth survival without any treatment of biological and/or technical complications. RESULTS The overall tooth survival rate was 89.6% after a mean observation time of 8.8 ± 2.3 years. The survival rate of teeth with a fiber post amounted to 94.3%, and for teeth without a post, it was 76.3% (P < .001). The main reason for tooth loss was root fracture (9.7%). No loss of post retention was observed. Successfully treated teeth without any biological and/or technical complications and requiring no additional treatment during the entire observation period amounted to 79.9%. CONCLUSIONS Endodontically treated teeth restored with fiber posts and either a direct composite restoration or a single-unit crown yielded higher survival and success rates compared with teeth restored without fiber posts. Vertical fractures of roots not containing a post represented a frequently encountered and serious problem.
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Affiliation(s)
- Kevin A Guldener
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Carla L Lanzrein
- Private Practice, Thun, Switzerland; Private Practice, Fribourg, Switzerland
| | - Beatrice E Siegrist Guldener
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Private Practice, Bern, Switzerland
| | - Niklaus P Lang
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Center for Dental Medicine, University of Zürich, Zürich, Switzerland
| | - Christoph A Ramseier
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Giovanni E Salvi
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
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Resistance of endodontically treated roots restored with different fibre post systems with or without post space preparation: in vitro analysis and SEM investigation. GIORNALE ITALIANO DI ENDODONZIA 2016. [DOI: 10.1016/j.gien.2016.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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LEMOS CAA, ALMEIDA DADF, BATISTA VEDS, MELLO CC, VERRI FR, PELLIZZER EP, MAZARO JVQ. Influence of diameter and intraradicular post in the stress distribution. Finite element analysis. REVISTA DE ODONTOLOGIA DA UNESP 2016. [DOI: 10.1590/1807-2577.21215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Abstract Introduction The biomechanical behavior of endodontically treated teeth depending on the selected restorative material and tooth situation to be restored. Objective To analyze by the two-dimensional finite element method the biomechanical behavior of different diameters in intraradicular posts and teeth with coronal remaining of 2mm. Material and method Six models were made with three types of posts, as follows: Glass fiber post, carbon fiber post, and cast metal post, both with diameter # 1 (1.1 mm in diameter) and # 2 (1.3 mm of diameter). The modeling was performed using the Rhinoceros 4.0 program. The FEMAP 10.2 and NEiNastran 9.2 programs were used to develop finite element models. The loading used was 100N for axial and oblique forces. The results were visualized using the von Mises stress map. The statistical analysis was made using analysis of variance (ANOVA) and Tukey post-test, with a significance level of 5%. Result The oblique loading stress values were higher than the axial loading (p<0.001) for both situations. The glass fiber post showed the lowest concentrations of stress on both loads (p<0.001). The carbon fiber post presented significant difference compared to the cast metal post, only in the oblique load (p=0.007). The diameter did not increase the stress of the evaluated posts (p=0.302). Conclusion The fiber posts were more favorable for restoration of endodontically treated teeth; the increase of diameter did not influence the increase of tension; the oblique load was more harmful for both posts and tooth structure.
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Gomes EA, Diana HH, Oliveira JS, Silva-Sousa YTC, Faria ACL, Ribeiro RF. Reliability of FEA on the Results of Mechanical Properties of Materials. Braz Dent J 2016; 26:667-70. [PMID: 26963214 DOI: 10.1590/0103-6440201300639] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 12/01/2015] [Indexed: 11/22/2022] Open
Abstract
The present study evaluated the reliability of FEA on the results of different mechanical properties (E and v) of materials. Two 3D models of a maxillary canine with endodontic treatment, intracanal post, composite resin core and restored with porcelain-fused-to-metal crown were generated according to micro-CT images. Two groups with different E and ν values for porcelain, metal coping alloy, resin cement and composite resin were established. The materials' properties for group GL were based on literature data, while for group GIE the impulse excitation technique was used. A load of 180 N was applied at 45° on the incisal third of the lingual surface of the canine tooth. All models were supported by the periodontal ligament (x=y=z=0). The von Mises stress (VMS) was calculated. The stress values revealed differences between the groups for both VMS distribution and value. The porcelain (GL: 5.966 MPa; GIE: 7.478 MPa), metal coping (GL: 3.811 MPa; GIE: 0.973 MPa) and core (GL: 4.771 MPa; GIE: 0.026 MPa) were significantly affected. In conclusion, this study showed that the determination of mechanical properties (E and ν) of materials is essential for the reliability on the results of FEA.
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Affiliation(s)
- Erica Alves Gomes
- Dental School, UNAERP - Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Hugo Henrique Diana
- Dental School, UNAERP - Universidade de Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | | | | | - Adriana Cláudia Lapria Faria
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, USP - Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Ricardo Faria Ribeiro
- Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, USP - Universidade de São Paulo, Ribeirão Preto, SP, Brazil
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Ibrahim AMB, Richards LC, Berekally TL. Effect of remaining tooth structure on the fracture resistance of endodontically-treated maxillary premolars: An in vitro study. J Prosthet Dent 2016; 115:290-5. [DOI: 10.1016/j.prosdent.2015.08.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 08/12/2015] [Accepted: 08/13/2015] [Indexed: 10/22/2022]
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Evaluation of a calcium silicate-based cement as a root reinforcement material for endodontically treated maxillary anterior teeth. J Prosthet Dent 2016; 115:35-41. [DOI: 10.1016/j.prosdent.2015.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 07/08/2015] [Accepted: 07/15/2015] [Indexed: 11/20/2022]
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Three-dimensional finite element analysis of endodontically treated teeth with weakened radicular walls restored with different protocols. J Prosthet Dent 2015; 114:383-9. [DOI: 10.1016/j.prosdent.2015.03.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 02/27/2015] [Accepted: 03/02/2015] [Indexed: 11/23/2022]
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