1
|
Wang ZF, Fu BP. Minimum residual root dentin thickness of mandibular premolars restored with a post: A finite element analysis study. J Prosthet Dent 2024; 131:878-885. [PMID: 35489836 DOI: 10.1016/j.prosdent.2022.03.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 03/21/2022] [Accepted: 03/21/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM Thin root dentin after post space preparation will increase the risk of root fracture. However, the minimum residual root dentin thickness to be preserved after post space preparation is unclear. PURPOSE The purpose of this finite element analysis (FEA) study was to measure the residual root dentin thicknesses and analyze the stress distributions of post-restored mandibular premolars. MATERIAL AND METHODS The cone beam computed tomography (CBCT) data of 90 first and second mandibular premolars from Chinese participants (44 men, 46 women; aged between 20 and 79 years) were analyzed. Cross-sections 5 to 9 mm from the radiologic apex were used to measure the buccolingual and mesiodistal root diameters. The probability that the residual thickness of the buccolingual and mesiodistal root walls would be no less than 0.5, 0.6, 0.7, 0.8, 0.9, and 1 mm after post space preparation with a #2 Peeso reamer was calculated. Six 3-dimensional finite element models of cast post-restored mandibular premolars with 0.5, 0.6, 0.7, 0.8, 0.9, and 1 mm mesial and distal root dentin thicknesses were established. A static force of 100 N was applied to the buccal cusp tip at 45, 60, 75, and 90 degrees to the long axis of the tooth, and the maximum tensile stress and von Mises stress were analyzed. The Bonferroni post hoc test (αcorrected=.003) was used for multiple comparisons. RESULTS The buccolingual root diameter of mandibular premolars was wider than the mesiodistal root diameter. The probabilities that the mesiodistal residual root dentin thickness of mandibular first and second premolars at 5 mm from the apex would be no less than 1 mm after post space preparation with a #2 Peeso reamer were only 10% and 28%, respectively. The maximum tensile stress was at a minimum when the mesial and distal residual root dentin thickness was 0.6 mm in the external cervical dentin adjacent to the crestal bone and 1 mm in the apical dentin corresponding to the apex of the post. The maximum tensile stress of the mandibular premolar model with 0.6-mm mesial and distal residual root dentin thicknesses was lower than that with 0.9 mm and 1.0 mm thicknesses (Pcorrected<.001). CONCLUSIONS Short posts or smaller instruments for post space preparation are recommended to obtain a 1-mm residual root dentin thickness in the mesiodistal direction of mandibular premolars. If a 1-mm thickness cannot be preserved, a minimum residual root dentin thickness of 0.6 to 0.9 mm in the mesiodistal direction should be retained.
Collapse
Affiliation(s)
- Ze-Feng Wang
- Dental Attending Physician, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, PR China
| | - Bai-Ping Fu
- Professor, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, PR China.
| |
Collapse
|
2
|
Sarıyılmaz Ö, Sessiz R, Kocaman OS. The Impact of Coronal Flaring Files on Pericervical Dentin Thickness in Mandibular Molars. J Endod 2024; 50:514-519. [PMID: 38272441 DOI: 10.1016/j.joen.2024.01.008] [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: 08/31/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/27/2024]
Abstract
INTRODUCTION This study aimed to assess the influence of different coronal flaring files on dentin removal in mandibular teeth using cone-beam computed tomographic (CBCT) images. METHODS CBCT images of 48 mandibular molar teeth were acquired and randomly divided into 2 main groups, with each main group further divided into 3 subgroups. In the first main group, root canal preparation was performed using TruNatomy (Dentsply Sirona, Ballaigues, Switzerland), ProTaper Gold (Dentsply Sirona), and One Curve (Micro-Mega, Besancon, France) files without the use of coronal flaring files. In the second main group, root canal preparation was performed using the same files with the use of coronal flaring files. After the completion of root canal preparation, a second set of CBCT images was obtained. Subsequently, the dentin removal and remaining critical dentin were assessed by measuring at 4 distinct points below the furcation level. Data were compared between groups using the Mann-Whitney U and Kruskal-Wallis tests with alpha set at 5%. RESULTS The ProTaper Gold files demonstrated higher dentin removal compared with the TruNatomy files. In the no-flaring groups, the One Curve files exhibited greater dentin removal than the TruNatomy files at specific levels. The use of coronal flaring files generally did not significantly impact dentin removal, except for certain cases in the TruNatomy and ProTaper Gold groups. CONCLUSIONS The TruNatomy instrument group was more effective in preserving pericervical dentin compared with the other instrument groups. Coronal flaring files can be confidently used to preserve critical dentin during root canal treatment.
Collapse
Affiliation(s)
- Öznur Sarıyılmaz
- Faculty of Dentistry, Departments of Endodontics, Çanakkale Onsekiz Mart University, Çanakkale.
| | - Rüya Sessiz
- Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Çanakkale Onsekiz Mart University, Çanakkale
| | - Osman Sefa Kocaman
- Ilgın Dr Vefa Tanir State Hospital, Turkish Republic Ministry of Health, Konya
| |
Collapse
|
3
|
Yang X, Chen X, Zhang Y, Huang L, Chen D, Zeng Q, Qiu X. Clinical outcomes of endodontic microsurgery in complicated cases with large or through-and-through lesions: a retrospective longitudinal study. Clin Oral Investig 2024; 28:172. [PMID: 38400913 DOI: 10.1007/s00784-024-05557-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 02/12/2024] [Indexed: 02/26/2024]
Abstract
OBJECTIVES To investigate the clinical outcomes of endodontic microsurgery in complicated cases presenting with large or through-and-through lesions. MATERIALS AND METHODS We retrospectively collected and analyzed preoperative, intraoperative, and follow-up data from 143 complicated cases that underwent endodontic microsurgery. Clinical outcomes were assessed in terms of tooth survival and surgery success. Cox regression analysis was used to evaluate the survival rate and identify associated risk factors. Additionally, the success rate was compared across different postoperative periods, and potential factors contributing to surgical failure were identified through binary logistic regression. RESULTS The overall survival and success rates were 93.0% and 91.7%, respectively. The Cox regression model identified four risk factors affecting tooth survival, including apicoectomy of four teeth (HR = 35.488; P = 0.0002), an open apex observed on preoperative radiographs (HR = 6.300; P = 0.025), the performance of guided tissue regeneration technique (HR = 8.846; P = 0.028), and a palatal surgical approach (HR = 8.685; P = 0.030). The success rate demonstrated an initial increase in the early postoperative period (from 0.5 to 2 years; P = 5.8124e-30), followed by stabilization (from 2 to 9 years; P = 0.298). Surgery success rate significantly declined when apicoectomy involved four teeth (OR = 109.412; P = 0.002). CONCLUSIONS Endodontic microsurgery demonstrates satisfactory outcomes in complicated cases, maintaining a stable success rate after two years. However, tooth survival and surgery success are significantly compromised when apicoectomy involves four teeth. Factors such as guided tissue regeneration, an open apex, and the palatal surgical approach are associated with an increased risk of tooth extraction. CLINICAL RELEVANCE Despite achieving acceptable outcomes in complicated cases, endodontic microsurgery is adversely affected by the apicoectomy of four teeth.
Collapse
Affiliation(s)
- Xiaoxia Yang
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Xuan Chen
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Yinchun Zhang
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Lei Huang
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Dongjie Chen
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Qinfang Zeng
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China
| | - Xiaoling Qiu
- Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, No. 366 South Jiangnan Avenue, Haizhu District, Guangzhou, 510280, China.
| |
Collapse
|
4
|
Stoilov M, Boehmer T, Stoilov L, Stark H, Marder M, Enkling N, Kraus D. Influence of Cementation Mode and Ferrule Design on the Fatigue Resistance of Monolithic Zirconia Endocrowns. J Clin Med 2024; 13:1165. [PMID: 38398475 PMCID: PMC10889707 DOI: 10.3390/jcm13041165] [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: 01/30/2024] [Revised: 02/13/2024] [Accepted: 02/17/2024] [Indexed: 02/25/2024] Open
Abstract
Background: Classic endocrowns made of dental ceramics are considered a promising alternative to traditional post-endodontic restorations. The use of circular ferrules in endocrowns is a topic of controversial discussion. Therefore, the present study aims to evaluate the effect of ferrule design and cementation mode on the fatigue resistance of zirconia endocrowns. Methods: Eighty human molars were divided into four groups (n = 20): NFC (no-ferrule, conventional cementation), NFA (no-ferrule, adhesive luting), FC (ferrule, conventional cementation) and FA (ferrule, adhesive luting). Both the classic and the modified endocrown preparation with a two-millimeter ferrule design were carried out. Endocrowns were fabricated from zirconia using the CEREC system. After thermocycling, specimens were loaded according to the step-stress test up to 1500 N. Results: Failure rate was low; 88.8% of total specimens passed the step-stress test. Fractures were distributed between all groups; no significant differences in fatigue resistance were detected for preparation design and cementation mode. Conclusions: Endocrowns appear to be a promising concept for endodontically treated molars. Ferrule and also cementation mode have only a minor influence on fatigue resistance of zirconia endocrowns. However, at very high forces, the marginal area of the ferrule represents a weak point.
Collapse
Affiliation(s)
- Milan Stoilov
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| | - Tobias Boehmer
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| | - Lea Stoilov
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| | - Helmut Stark
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| | - Michael Marder
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| | - Norbert Enkling
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
- Department of Reconstructive Dentistry and Gerodontology, Bern University, 3012 Bern, Switzerland
| | - Dominik Kraus
- Department of Prosthodontics, Preclinical Education and Dental Materials Science, Bonn University, 53111 Bonn, Germany; (T.B.); (L.S.); (H.S.); (M.M.); (N.E.); (D.K.)
| |
Collapse
|
5
|
Lima MO, Ferretti MA, Caldas RA, Barão VAR, França FMG, Lima DANL, Martins LR, Aguiar FHB. Application of polyetheretherketone (PEEK) posts: evaluation of fracture resistance and stress distribution in the root: in vitro and finite element analyses. Braz Oral Res 2023; 37:e047. [PMID: 37255067 DOI: 10.1590/1807-3107bor-2023.vol37.0047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 12/06/2022] [Indexed: 06/01/2023] Open
Abstract
To evaluate the feasibility of using a milled polyetheretherketone (PEEK) post and core in endodontically treated teeth with or without a ferrule. Sixty bovine tooth roots were endodontically treated followed by cementation of intraradicular retainers (IR), according to each experimental group: a) non-ferrule glass fiber post (f0FP); b) 2-mm-ferrule glass fiber post (f2FP); c) non-ferrule resized glass fiber post (f0PR); d) 2-mm-ferrule resized glass fiber post (f2PR); e) non-ferrule PEEK post and core (f0PPC); and f) 2-mm-ferrule PEEK post and core (f2PPC). Metal crowns were made and cemented. A periodontal ligament was simulated using polyether. A force was applied to the palatine portion of each sample at 45°, until fracture. Fracture resistance data were submitted to two-way ANOVA and Tukey's test (α = 0.05). Three-dimensional digital models were developed to calculate the tensions formed in the root using finite element analysis. Models of glass fiber posts and PEEK posts and cores were evaluated with or without a ferrule. The results were analyzed by the Mohr-Coulomb criterion. The type of IR was not influenced by fracture strength (p = 0.243). There were significant statistical differences among the remaining factors. Ferrule groups had greater fracture resistance, and the failure mode of teeth with a ferrule was more catastrophic than the non-ferrule group. A ferrule increases fracture resistance and influences failure mode; the PEEK post and core did not modify the biomechanics of endodontically treated teeth, and resembled the glass fiber post results. The crack initiation point differed between the ferrule and non-ferrule groups.
Collapse
Affiliation(s)
- Michele Oliveira Lima
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Marcela Alvarez Ferretti
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Ricardo Armini Caldas
- Universidade Federal de Santa Catarina - UFSC, Department of Dentistry, Florianópolis, SC, Brazil
| | - Valentim Adelino Ricardo Barão
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Prosthodontics and Periodontology, Piracicaba, SP, Brazil
| | | | - Débora Alves Nunes Leite Lima
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Luís Roberto Martins
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Flávio Henrique Baggio Aguiar
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| |
Collapse
|
6
|
Gong Q, Huang L, Luo J, Zhang Y, Meng Q, Quan J, Tong Z. The practicability of different preparation of mandibular molar restored by modified endocrown with intracanal extension: Computational analysis using finite element models. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 226:107178. [PMID: 36242865 DOI: 10.1016/j.cmpb.2022.107178] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 10/01/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND AND OBJECTIVE Post-core-crown (PCC) and endocrown are two common restorative methods for severely damaged molars, but exhibit disadvantages. This study aimed to explore the practicability of modified endocrown with a 2 mm intracanal extension (MED) to restore defective teeth using finite element analysis (FEA). METHODS Five groups of numerical models of mandibular molars restored by three MEDs, a PCC, and a routine endocrown after root canal treatment were devised by FEA software. We constructed 4 mm, 3 mm, and 2 mm thickness of MED restorations to restore mandibular molars that were prepared to 1 mm, 2 mm, and 3 mm from the cemento-enamel junction (CEJ). Furthermore, PCC and routine endocrown were used to compare the stress distribution with MED. Lithium disilicate glass-ceramics (EMAX) and resin nanoceramics (LU) were considered restorative materials, and a vertical load of 600 N and an oblique load of 200 N were applied to the restorations. RESULTS In three MEDs by LU, 2 mm thickness of restoration generated the highest stress on prepared teeth, while the thickness of EMAX did not significantly influence the stress value. MED by LU generated higher stress around the CEJ, and reduced the stress on the middle and lower root compared to MEDs by EMAX, PCC by EMAX, and PCC by LU. MED by EMAX caused lower stress around the CEJ, and generated higher stress in the chamber walls after extended root canals compared with MED by LU, endocrowns by LU, and endocrowns by EMAX. There was an evident stress concentration at the last but one layer, which was a thin area of the tooth root in all restorative models. CONCLUSIONS The use of modified endocrown may be considered an effective restorative method to restore defective mandibular molar, but suitable restorative material must be selected based on the tooth preparation method and deficiencies in the tooth structure.
Collapse
Affiliation(s)
- Qimei Gong
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Luo Huang
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Junpan Luo
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yuejiao Zhang
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Qingzhen Meng
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jingjing Quan
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Zhongchun Tong
- Hosiptal of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China.
| |
Collapse
|
7
|
Alhajj MN, Qi CH, Sayed ME, Johari Y, Ariffin Z. Fracture Resistance of Titanium and Fiber Dental Posts: A Systematic Review and Meta-Analysis. J Prosthodont 2021; 31:374-384. [PMID: 34499376 DOI: 10.1111/jopr.13428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2021] [Indexed: 11/26/2022] Open
Abstract
PURPOSE The fracture resistance of dental post systems is influenced by the material of the post. The purpose of this systematic review and meta-analysis was to assess if there is a difference in fracture resistance between prefabricated dental titanium posts and fiber posts. METHODS An online electronic search was performed using the PubMed, Scopus, and Web of Science databases for in vitro studies published from 2010 to 2020 in English. The retrieved eligible studies that compared the fracture resistance of titanium and fiber posts on human teeth were selected. The pooled standardized mean difference (SMD) with a 95% confidence interval was calculated. In addition, the trial sequential analysis (TSA) was performed to test if the available studies are sufficient to make conclusive evidence. RESULTS Of the 1165 retrieved studies, 17 studies were included in the qualitative analysis, while 16 studies were included in the quantitative analysis. Because of the high heterogeneity among studies, data from 10 studies were pooled and submitted to TSA. A total of 852 teeth were evaluated for fracture of the posts in 27 independent comparison groups. The pooled effect of the residual studies revealed no significant difference between titanium and fiber posts (SMD = -0.12; 95% CI = -0.30, 0.06; p = 0.20). Results of the TSA revealed no conclusive evidence. CONCLUSIONS The results of the current evidence revealed no significant difference between fiber and titanium posts. The evidence is insufficient, and more standardized in vitro studies are required.
Collapse
Affiliation(s)
- Mohammed Nasser Alhajj
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia.,Department of Prosthodontics, Faculty of Dentistry, Thamar University, Dhamar, Yemen
| | - Chong Hui Qi
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| | - Mohammed E Sayed
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Yanti Johari
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| | - Zaihan Ariffin
- Prosthodontics Unit, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| |
Collapse
|
8
|
Hofsteenge JW, Gresnigt M. The Influence of Dentin Wall Thickness and Adhesive Surface in Post and Core Crown and Endocrown Restorations on Central and Lateral Incisors. Oper Dent 2021; 46:75-86. [PMID: 33882135 DOI: 10.2341/19-261-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/05/2020] [Indexed: 11/23/2022]
Abstract
CLINICAL RELEVANCE Post and core crowns and endocrowns perform similarly on fracture strength, but endocrowns have more repairable fractures. SUMMARY
Collapse
|
9
|
Durigon M, Cecchin D, de Carli J, Souza MA, Farina A. Could calcium hypochlorite and grape seed extract keep the mechanical properties of root dentin and fracture resistance of weakened roots? J Mech Behav Biomed Mater 2020; 106:103736. [DOI: 10.1016/j.jmbbm.2020.103736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 03/11/2020] [Accepted: 03/16/2020] [Indexed: 11/28/2022]
|
10
|
Hu X, Liu M, Ji Y, Du Y, Wang L, Zhou X, Zhang F. Enhanced mechanical properties and biosafety evaluation of surface-modified fiberglass-reinforced resin-based composite piles. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2019; 30:70. [PMID: 31168668 DOI: 10.1007/s10856-019-6269-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Accepted: 05/18/2019] [Indexed: 06/09/2023]
Abstract
The purpose of this study is to analyze various surface grafting modifications of fiberglass-reinforced resin based composite piles. In addition, the effects of surface modifications of fiberglass-reinforced resin piles in terms of biosafety and mechanical strength were studied. According to different surface treatment methods, the fiberglass was divided into five groups (A-E): a blank control group, a KH570 processing group, a KH570 processing+Bis-GMA grafting 1 h group, a KH570 processing+Bis-GMA grafting 3 h group and a KH570 processing+Bis-GMA grafting 7 h group. All surface-treated materials were characterized using scanning electron microscope, thermogravimetric analyses and Fourier transform infrared spectrum and mechanical testing using a universal mechanical tester. The biosafety was evaluated by cell viability experiments and repeated oral toxicity tests and Ames tests. The Bis-GMA grafting modification further enhanced the mechanical properties of resin piles. By increasing the grafting time, the grafting effect and mechanical properties were further enhanced. The surfaces grafted for 7 h (Group E) remarkably improved the mechanical properties (flexural strength ~696.24 MPa; flexural load ~185.67N). The graft modifications improved the mechanical properties of fiber pile resin-based materials. The prolonged grafting time further improved the mechanical properties corresponding to enhanced grafting and the formation of a stable interface between fibers and the resin matrix. The surface-modified dental resin-based fiber did not show any signs of toxicity, cytotoxicity or mutagenicity, suggesting the potential biological safety of these materials in the clinical practice.
Collapse
Affiliation(s)
- Xiaokun Hu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, Jiangsu, China
| | - Mei Liu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, Jiangsu, China
| | - Yu Ji
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, Jiangsu, China
| | - Yueming Du
- Chairman Unit of Dental Professional Committee of Wuxi Medical Association, Wuxi, 214001, Jiangsu, China
| | - Lili Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, Jiangsu, China
| | - Xuefeng Zhou
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Feimin Zhang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, Jiangsu, China.
| |
Collapse
|
11
|
Sary S B, Samah M S, Walid A AZ. Effect of restoration technique on resistance to fracture of endodontically treated anterior teeth with flared root canals. J Biomed Res 2019; 33:131-138. [PMID: 30418168 PMCID: PMC6477170 DOI: 10.7555/jbr.32.20170099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study was designed to compare the impact of post and core systems on resistance to fracture of endodontically treated anterior teeth with flared root canals and to assess their fracture pattern. Sixty central incisors were cut horizontally 2 mm coronal to the cementoenamel junction (CEJ). After root canal therapy, teeth were assigned into 6 groups (n=10 each) based on a post system and used as follows: Group C, non-flared root received size #1 glass fiber posts (Control); Group AP, flared root restored with anatomical post; Group RC, flared root restored with size #1 fiber post and cemented with thick layer of resin cement; Group CR, flared root restored with size #1 and reinforced with composite resin; Group CM, cast post-core; Group CP, CAD/CAM polymer-infiltrated ceramic post and core. Following post cementation, core build-up and crown insertion, the specimens were thermo-cycled up to 10,000 cycles (5C/55C; 30 seconds dwell time, 6 seconds transition time) and then statically loaded at 1 mm/minute crosshead speed using a universal testing machine. One-way ANOVA and Tukey HSD post hoc test (α=0.05) were used for data analysis. Group C recorded significantly higher resistance to fracture values [(826.9±39.1) N] followed by group CP [(793.8±55.6) N] while group RC yielded the lowest fracture resistance values [(586.7±51.4) N]. The resistance to fracture of wide root canals can be enhanced by using one-piece CAM/CAM post and core as an alternative to the use of either glass fiber post, relined with composite resin increasing the thickness of luting cement or the use of cast post and core system. However, this was an in vitro investigation and further in vivo studies are necessary.
Collapse
Affiliation(s)
- Borzangy Sary S
- Department of Substitutive Dental Sciences, College of Dentistry, Taibah University, Medina 42353, Saudi Arabia
| | - Saker Samah M
- Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura 35516, Egypt
| | - Al-Zordk Walid A
- Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura 35516, Egypt
| |
Collapse
|
12
|
Báez A, Durán G, de Nordenflycht D, Fuentes M. Anterior composite resin crown in an adverse situation: A dental technique with a 3-year follow-up. J Prosthet Dent 2018; 121:13-16. [PMID: 30017149 DOI: 10.1016/j.prosdent.2018.02.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 02/27/2018] [Accepted: 02/28/2018] [Indexed: 11/24/2022]
Abstract
Endodontically treated teeth often exhibit severe coronal structure loss. Given the reversibility and tissue conservation of adhesive procedures, a conservative approach using an indirect resin crown with an adhesively cemented custom fiber-reinforced composite resin post provided a predictable and esthetic solution. The 24-hour and 3-year follow-ups of this technique showed good function, marginal adaptation, and esthetics.
Collapse
Affiliation(s)
- Abelardo Báez
- Chief Director, Department of Restorative Dentistry, Universidad Andrés Bello, Viña del Mar, Chile.
| | - Gerardo Durán
- Assistant Professor, Facultad de Ciencias de la Salud, Universidad Arturo Prat, Iquique, Chile
| | - Diego de Nordenflycht
- Assistant Professor, Department of Restorative Dentistry, Universidad Andrés Bello, Viña del Mar, Chile
| | - Mariana Fuentes
- Instructor, Department of Restorative Dentistry, University of Diego Portales, Santiago, Chile
| |
Collapse
|
13
|
da Silveira-Pedrosa DM, Martins LR, Sinhoreti MA, Correr-Sobrinho L, Sousa-Neto MD, Costa ED, de F Pedrosa-Filho C, de Carvalho JR. Push-out Bond Strength of Glass Fiber Posts Cemented in Weakened Roots with Different Luting Agents. J Contemp Dent Pract 2016; 17:119-24. [PMID: 27206999 DOI: 10.5005/jp-journals-10024-1813] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIM To evaluate the push-out bond strength (BS) of direct anatomic posts (DAPs) and conventional fiber posts (CFPs) cemented with different luting agents in different thirds of flared root canals. MATERIALS AND METHODS A total of 60 human single-rooted canine teeth were transversally sectioned 16 mm from the radicular apex. After endodontic treatment, canals were flared with diamond burs. Samples were divided into six groups according to post type and luting agent: DAP and RelyX U100 (RXU); DAP and RelyX ARC (RXA); DAP and RelyX Luting 2 (RXL); CFP and RXU; CFP and RXA; CFP and RXL. Roots were sectioned transversely into six 1-mm-thick slices. The push-out test was performed and failure modes were observed. RESULTS The DAP groups (7.23 ± 2.05) showed highest BS values (p < 0.05) when compared with CFP (5.93 ± 1.76). RelyX U100 (8.17 ± 1.70) showed higher BS values (p < 0.05) than RXA (6.46 ± 1.38), and RXL (5.10 ± 1.65) showed the lowest values. Bond strength on the apical third was statistically lower (p < 0.05) than that on the other thirds of the root canals. There was a predominance of adhesive failure for all groups. CONCLUSION The DAPs improved retention in flared root canals, and RXU was the most effective luting agent. The apical third showed the lowest BS values. CLINICAL SIGNIFICANCE The relining procedure of fiber posts with composite and the proper selection of luting resin cement are important for increasing bonding effectiveness in flared root canals.
Collapse
Affiliation(s)
- Daniele M da Silveira-Pedrosa
- Health Sciences Postgraduate Program, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil
| | - Luis Rm Martins
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil
| | - Mário Ac Sinhoreti
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil
| | - Lourenço Correr-Sobrinho
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil
| | - Manoel D Sousa-Neto
- Department of Restorative Dentistry, Ribeirão Preto Dental School, University of Sao Paulo, USP, Ribeirão Preto, Sao Paulo, Brazil
| | - Edson D Costa
- Department of Dentistry, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil
| | - Celso de F Pedrosa-Filho
- Department of Dentistry, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil
| | - Jacy Ribeiro de Carvalho
- Professor, Department of Dentistry, Health Sciences School, Campus Universitario Darcy Ribeiro, Departamento de Odontologia-FS/UnB. Asa Norte, CEP: 70910-900 Brasilia, DF, Brazil, Phone: +556131071802, e-mail:
| |
Collapse
|