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Castro-Ramirez L, Espinoza-Salcedo M, Huamani-Echaccaya J, Ladera-Castañeda M, Cervantes-Ganoza L, Hernández-Huamaní E, Aroste-Andía R, Gavilán-Chávez P, Cayo-Rojas C. Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study. Clin Cosmet Investig Dent 2024; 16:153-165. [PMID: 38808075 PMCID: PMC11131952 DOI: 10.2147/ccide.s465226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024] Open
Abstract
Aim This study aimed to evaluate the effects of polywave and monowave light-emitting diode curing units on the microtensile bond strength and failure types of three bulk-fill resin composites. Materials and Methods This in vitro experimental study was performed on 180 microbars obtained from human third molars and were distributed into 12 groups according to the type of bulk-fill resin composite and the light-curing unit. Third molars were restored using Filtek One Bulk Fill Restorative, Tetric® N-Ceram Bulk Fill, and Opus Bulk Fill resin composites was light-cured with Elipar Deep Cure L and Valo in three modes: standard, high power, and extra power. Subsequently, microtensile analysis was carried out with a universal testing machine and the type of failure with an optical stereomicroscope. For statistical analysis, the Kruskal-Wallis H-test was used, with the Bonferroni post hoc test and Fisher's exact test, considering a significance of p<0.05. Results There were significant differences in the microtensile bond strength between the Filtek One Bulk Fill restorative and Opus Bulk-Fill (p = 0.042) when light was cured with the polywave unit at standard power. On the other hand, the Filtek One Bulk Fill Restorative and Opus Bulk Fill resins showed significant differences in microtensile bond strength when light was cured with the monowave unit compared with the polywave unit (p<0.05). Conclusion The presence of alternative photoinitiator systems that are more reactive than camphorquinone produced higher microtensile bond strength in Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins when light-cured with a high and standard polywave unit, respectively, compared to Filtek One Bulk Fill resins. Finally, Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins had the highest percentage of mixed failures, while Filtek One Bulk Fill resin had adhesive failures, which was related to its lower microtensile bond strength.
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Affiliation(s)
- Leonor Castro-Ramirez
- Postgraduate School, Universidad Privada Antenor Orrego, Trujillo, Peru
- School of Stomatology, Universidad Privada San Juan Bautista, Lima, Peru
| | | | | | - Marysela Ladera-Castañeda
- Faculty of Dentistry and Postgraduate School, Research Team “Salud Pública – Salud Integral”, Universidad Nacional Federico Villarreal, Lima, Peru
| | | | | | - Rosa Aroste-Andía
- School of Stomatology, Universidad Privada San Juan Bautista, Ica, Peru
| | | | - César Cayo-Rojas
- School of Stomatology, Universidad Privada San Juan Bautista, Lima, Peru
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Zuo Q, Li A, Teng H, Liu Z. Influence of internal angle and shape of the lining on residual stress of Class II molar restorations. Comput Methods Biomech Biomed Engin 2024; 27:680-688. [PMID: 38229450 DOI: 10.1080/10255842.2024.2301792] [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: 09/19/2023] [Accepted: 12/28/2023] [Indexed: 01/18/2024]
Abstract
Polymerization shrinkage is a major side effect of resin composite materials that affects the success and longevity of caries restorations. This study was to analyze the effect of the internal angle and shape of the lining on the shrinkage residual stress of dental restorations in Class II mesio-occlusal-distal (MOD) cavities through finite element analysis (FEA). A 3D reconstructed model of a human mandibular first molar was created from micro-CT images, and then the tooth was prepared as a Class II MOD cavity. 3D models of four regular internal corner shapes of Class II MOD cavities with different internal angles of lining and one 90° filleted corner model were created. The thermal expansion technique was applied to approximate the shrinkage impact of composite resin polymerization in the FE software ABAQUS. Von Mises stress was taken as a metric. The results showed that the level of residual stresses in the Class II MOD cavities was greatly dependent on the internal angle of the lining. The maximum von Mises stress in tooth tissue decreased as the internal angle of the lining increased. The internal shapes of the lining had no obvious effect on the stress, and the filleted corner model had less stress. This lining strategy is appropriate for Class II MOD cavities with serious loss of tooth tissue.
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Affiliation(s)
- Qianqian Zuo
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Sichuan University Yibin Park, Yibin Institute of Industrial Technology, Yibin, China
| | - Annan Li
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Sichuan University Yibin Park, Yibin Institute of Industrial Technology, Yibin, China
| | - Haidong Teng
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Sichuan University Yibin Park, Yibin Institute of Industrial Technology, Yibin, China
| | - Zhan Liu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Sichuan University Yibin Park, Yibin Institute of Industrial Technology, Yibin, China
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Xu J, Ma J, Tan Z, Zhang Q, Hu J, Li J. A 3D-FEA study on the impact of different preparation forms and materials on posterior occlusal veneers. J Mech Behav Biomed Mater 2024; 152:106462. [PMID: 38346366 DOI: 10.1016/j.jmbbm.2024.106462] [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: 01/07/2024] [Revised: 02/05/2024] [Accepted: 02/07/2024] [Indexed: 03/04/2024]
Abstract
OBJECTIVES To study the stress distribution and bonding performance in posterior occlusal veneers and tooth bodies under different preparation forms and materials. METHODS An isolated lower right first molar was prepared with non-retention type (type A), cavity-retained type (type B), and encircling-retention type (type C) forms. MicroCT images of the tooth were obtained and digitally converted into three-dimensional solid models. Three-dimensional models of veneers for the three abutment teeth were designed, fabricated, and divided into nine models (AEM, ALU, AVE, BEM, BLU, BVE, CEM, CLU, and CVE) according to the material used (E.max CAD [EM], Lava Ultimate [LU] and Vita Enamic [VE]). Three-dimensional finite element stress analysis was performed by applying vertical and oblique forces (200 N) to simulate chewing loads using ABAQUS. Finally, an adhesive stiffness degradation diagram was obtained using the rotatory dislocation simulation method. RESULTS The BEM model had the largest equivalent stress extreme value (160.50 MP A) when a vertical load was applied to the veneers, while there was no significant difference when it was applied to dental tissues. The equivalent stress extreme values of each part under an oblique load were significantly greater than those under a vertical load. The AEM model had the largest values when the loads were applied to the veneers (350.60 MP A) and the dental tissues (40.13 MP A). The equivalent stress extreme values of the veneers were ranked as LU < VE < EM for different materials, and LU > VE > EM for dental tissues. Bonding performance results were C > B ≈ A and LU > VE > EM. CONCLUSIONS The cavity-retained type better protected the veneers and dental tissues than the non-retention and encircling-retention types under lateral forces. E.max CAD material, with a high elastic modulus, reduced the stress transmitted to the remaining dental tissues. Lava Ultimate exhibited the best bonding performance.
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Affiliation(s)
- Junchen Xu
- Department of Geriatric Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China; Jiangsu Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomalogical Translational Medicine, China
| | - Junchi Ma
- Department of Geriatric Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China; Jiangsu Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomalogical Translational Medicine, China
| | - Zhaolin Tan
- College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
| | - Qi Zhang
- Department of Geriatric Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China; Jiangsu Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomalogical Translational Medicine, China
| | - Jian Hu
- Department of Geriatric Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China; Jiangsu Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomalogical Translational Medicine, China
| | - Jin Li
- Department of Geriatric Dentistry, The Affiliated Stomatological Hospital of Nanjing Medical University, 136 Hanzhong Road, Nanjing, 210029, China; Jiangsu Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomalogical Translational Medicine, China.
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Guler MS. Low and high viscosity bulk-fill composite resins stress distribution in primary molar tooth inlay cavity. Comput Methods Biomech Biomed Engin 2024; 27:411-418. [PMID: 37216569 DOI: 10.1080/10255842.2023.2215370] [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: 02/24/2023] [Revised: 05/08/2023] [Accepted: 05/12/2023] [Indexed: 05/24/2023]
Abstract
The aim of this study is to evaluate the stress distributions of low and high viscosity bulk-fill composite resins at class II MOD inlay cavity in primary molar tooth using Finite Element Analysis (FEA). Original DICOM data of a primary molar tooth from a research archive was used to create a 3D model. Two models were prepared as Model 1: the tooth model without restoration (control group) and Model 2: the tooth model with class II MOD inlay restoration. Two different bulk-fill composite resins were tested in study: Model 2 A (class II MOD inlay cavity model restored with low viscosity bulk-fill composite resin) and Model 2B (class II MOD inlay cavity model restored with high viscosity bulk-fill composite resin). Occlusal vertical loading of 232 N was applied to the teeth in occlusal contact areas. Maximum Von Mises stress values in the models for enamel, dentin, and restorative material were evaluated as MPa. More intense stress accumulation is observed in enamel than in dentin. In addition, more stress values were determined in Model 2B (206.15 MPa, 32.76 MPa, 128.95 MPa) than in Model 2 A (203.39 MPa, 29.77 MPa, 120.61 MPa) for enamel, dentin and restorative material, respectively.
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Affiliation(s)
- Mehmet Sami Guler
- Department of Machinery and Metal Technologies, Vocational School of Technical Sciences, Ordu University, Ordu, Turkey
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Guler MS, Guler C, Belduz Kara N, Odabasi D, Bekci ML. The stress distribution of a primary molar tooth restored with stainless steel crown using different luting cements. BMC Oral Health 2024; 24:269. [PMID: 38395853 PMCID: PMC10893635 DOI: 10.1186/s12903-024-04038-7] [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: 10/17/2023] [Accepted: 02/16/2024] [Indexed: 02/25/2024] Open
Abstract
BACKGROUND The aim of this study is to evaluate the stress distributions of a primary molar tooth restored with a stainless steel crown (SSC) using resin and glass ionomer luting cements by Finite Element Analysis (FEA). METHODS Original DICOM data of a primary molar was used to create a 3D model. One model was prepared as a tooth model with SSC. A 30 μm cement layer was used in model. Two different luting cements were tested in the study: self-cure adhesive resin cement, and glass ionomer cement. Vertical and oblique loads of 330 N were applied to simulate maximum bite force and lateral forces in the occlusal contact areas of the models. Maximum von Mises stress values in the models were evaluated as MPa. RESULTS The maximum von Mises stress value was observed in the force application and general occlusal contact areas for all models. The maximum von Mises stress values were higher in the tooth model with SSC using self-cure adhesive resin cement (478.09 MPa and 214.62 MPa) than in the tooth model with SSC using glass ionomer cement (220.06 MPa and 198.72 MPa) in both vertical and oblique loading, respectively. CONCLUSIONS Depending on the magnitude of the bite force on the SSC, fracture of the luting cement materials could occur if the stress exceeds the endurance limit of the luting cement. Cementation with glass ionomer cement may help to reduce stress levels in SSC restorations of primary molars in children.
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Affiliation(s)
- Mehmet Sami Guler
- Department of Machinery and Metal Technologies, Vocational School of Technical Sciences, Ordu University, Ordu, Turkey
| | - Cigdem Guler
- Department of Pediatric Dentistry, Faculty of Dentistry, Ordu University, Ordu, Turkey
| | - Nihal Belduz Kara
- Department of Pediatric Dentistry, Faculty of Dentistry, Ordu University, Ordu, Turkey
| | - Didem Odabasi
- Department of Pediatric Dentistry, Faculty of Dentistry, Ordu University, Ordu, Turkey.
| | - Muhammed Latif Bekci
- Department of Machinery and Metal Technologies, Vocational School of Technical Sciences, Ordu University, Ordu, Turkey
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Tsertsidou V, Mourouzis P, Dionysopoulos D, Pandoleon P, Tolidis K. Fracture Resistance of Class II MOD Cavities Restored by Direct and Indirect Techniques and Different Materials Combination. Polymers (Basel) 2023; 15:3413. [PMID: 37631470 PMCID: PMC10458958 DOI: 10.3390/polym15163413] [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: 07/08/2023] [Revised: 08/04/2023] [Accepted: 08/14/2023] [Indexed: 08/27/2023] Open
Abstract
This study aimed to evaluate the fracture resistance of class II MOD cavities restored using different techniques and materials. Sixty extracted maxillary molars were selected and standardized class II MOD cavities were prepared using a custom-made paralleling device. The specimens were divided into four groups based on the restoration technique used: Group 1 (direct resin composite), Group 2 (short-fiber-reinforced composite resin), Group 3 (composite polyethylene fiber reinforcement), and Group 4 (CAD/CAM resin inlays). Fracture resistance was assessed for each group after thermocycling aging for 10,000 cycles. The mode of fracture was assigned to five types using Burke's classification. To compare the fracture force among the tested materials, a paired sample t-test was performed. The significance level for each test was set at p < 0.05. Significant differences in fracture resistance were observed among the different restoration techniques. CAD/CAM inlays (2166 ± 615 N), short-fiber-reinforced composite resin (2471 ± 761 N), and composite polyethylene fiber reinforcement (1923 ± 492 N) showed superior fracture resistance compared to the group restored with direct resin composite (1242 ± 436 N). The conventional resin composite group exhibited the lowest mean fracture resistance. The choice of restoration material plays a critical role in the clinical survival of large MOD cavities. CAD/CAM inlays and fiber-reinforced composites offer improved fracture resistance, which is essential for long-term success in extensive restorations.
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Affiliation(s)
- Vasiliki Tsertsidou
- Department of Dental Tissues Pathology and Therapeutics, Division of Operative Dentistry, Faculty of Dentistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (V.T.); (D.D.); (K.T.)
| | - Petros Mourouzis
- Department of Dental Tissues Pathology and Therapeutics, Division of Operative Dentistry, Faculty of Dentistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (V.T.); (D.D.); (K.T.)
| | - Dimitrios Dionysopoulos
- Department of Dental Tissues Pathology and Therapeutics, Division of Operative Dentistry, Faculty of Dentistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (V.T.); (D.D.); (K.T.)
| | - Panagiotis Pandoleon
- Department of Prosthodontics, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Kosmas Tolidis
- Department of Dental Tissues Pathology and Therapeutics, Division of Operative Dentistry, Faculty of Dentistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (V.T.); (D.D.); (K.T.)
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Talreja KS, Rodrigues SJ, Pai UY, Shetty T, Saldanha S, Mahesh M, Hegde P, Shenoy SB, Naik N, Mukherjee S, Sales A, Kamath V, Bajantri P. A Nonlinear Three-Dimensional Finite Element Analysis of Stress Distribution and Microstrain Evaluation in Short Dental Implants with Three Different Implant-Abutment Connections in Single and Splinted Conditions in the Posterior Mandible. Int J Dent 2023; 2023:8851098. [PMID: 37885810 PMCID: PMC10599862 DOI: 10.1155/2023/8851098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/10/2023] [Accepted: 06/24/2023] [Indexed: 10/28/2023] Open
Abstract
Background Stress distribution plays a vital role in the longevity and success of implant-supported prosthesis. This study evaluated the von Mises stress and microstrain in the peri-implant bone and the implant-abutment junction of short dental implants with three different implant-abutment connections in splinted and unsplinted conditions using finite element analysis (FEA). Materials and Methods In this experimental study, nine transversely isotropic finite element models were developed, and randomly divided into three equal groups (n = 3): control, (Group AC) single-standard 4.3 × 10 mm bone level implant-supported restorations with external hexagonal (EH) connection, internal conical (IC) and internal trichannel (ITC) connection, single short implant-supported restorations (Group AT), and splinted short implant-supported restorations (Group B) for each of the three implant-abutment connections, respectively. A 200 N load was applied along the long axis of the implants and a 100 N (45°) oblique load was applied and von Mises stress and microstrain values were evaluated. Results Single standard implants demonstrated the highest von Mises stress and microstrain values followed by single short implants and splinted short implants, respectively. Among the implant-abutment connections, the IC connection showed the highest values and the ITC connection showed the least values. Conclusion Within the limitations of this study, it was concluded that splinting of short dental implants demonstrated lesser and more homogeneous stress and microstrain, especially on oblique loading. The microstrain values for all connections evaluated were within the physiological loading limit (200-2,500 N) and were hence considered safe for clinical use.
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Affiliation(s)
- Karishma S. Talreja
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Shobha J. Rodrigues
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Umesh Y. Pai
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Thilak Shetty
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Sharon Saldanha
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - M. Mahesh
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Puneeth Hegde
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Satish B. Shenoy
- Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Nithesh Naik
- Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Sandipan Mukherjee
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Ann Sales
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Vignesh Kamath
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Prashant Bajantri
- Department of Prosthodontics and Crown and Bridge, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
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Yoon Y, Lee MJ, Kang I, Oh S. Evaluation of Biomechanical Stability of Teeth Tissue According to Crown Materials: A Three-Dimensional Finite Element Analysis. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4756. [PMID: 37445067 DOI: 10.3390/ma16134756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 06/18/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023]
Abstract
The biomechanical effects of dental tissue according to various dental crown materials were investigated using finite element analysis. Bone, prepared tooth, root canal, and periodontal ligament were modeled based on computed tomography. Depending on the characteristics of the crown material, it was classified into zirconia, hybrid ceramic, gold alloy, and acrylic resin. A loading force of 200 N was applied in the vertical direction to the occlusal surface of the crown, and analysis was performed under the condition that all interfaces were tied. The results demonstrate that the highest von Mises stress was shown in the prepared tooth of the acrylic resin model, which is a temporary prosthesis, and the pulpal pressure was also the highest. Additionally, among the final prosthesis, the highest stress was shown in the hybrid ceramic model prepared teeth. The properties of restoration materials can be a factor influencing the tooth structure. Thus, in order to make a correct decision when selecting a material for restorative treatment, it is necessary to understand, analyze, and evaluate the properties of these restoration materials.
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Affiliation(s)
- Youngjae Yoon
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Myung-Jin Lee
- Department of Dental Hygiene, Division of Health Science, Baekseok University, Cheonan 31065, Republic of Korea
| | - Inyeong Kang
- School of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Sanghwan Oh
- Department of Dental Hygiene, Konyang University, Daejeon 35365, Republic of Korea
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Al Aggan N, Nabih SM, Abd Al Hady AAA. Influence of the cervical margin relocation on stress distribution -. BRAZILIAN JOURNAL OF ORAL SCIENCES 2023; 22:e230356. [DOI: 10.20396/bjos.v22i00.8670356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023] Open
Abstract
Aim: Evaluate the influence of the cervical margin relocation (CMR) on stress distribution in the lower first molar restored with direct nano-ceramic composite (zenit). Methods: A 3D model of the lower first molar was modeled and used. Standardized mesio-occluso-distal (MOD) preparation consisted in two models used in this study with mesial subgingival margin in model II. (CMR) was applied in model II using flowable composite or resin glass ionomer (Riva). Both models were restored with nanoceramic composite and then subjected to six runs (2 for the model I and 4 for model II) with load (100N) as two load cases, one at (11º) and other at (45º) from the vertical axis. The stress distributions (FEA) in the final restoration and (CMR) material were analyzed using 3D models. Results: The two models recorded an equivalent Von Mises stress and Total deformation in the final restoration, regardless of the difference in the oblique angle incidence from (11º to 45º) or the type of the material used for (CMR) there was no significant difference in the (FEA) between the model with CMR (model II) and the model without CMR (model I). Conclusions: (CMR) technique seems to be biomechanically beneficial with high eccentric applied stress, (CMR) with resin glass ionomer or flowable composite resin in combination with nanoceramic composite improved the biomechanical behavior of (MOD) cavities extended below cement enamel junction (CMR) with high modulus elasticity material like (Riva) exhibits a more uniform stress distribution.
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Tardelli JDC, de Barros Ciribelli Alves BM, da Costa Valente ML, dos Reis AC. Influence of the modulus of elasticity of dental implants on the distribution of stresses in the alveolar bone by the finite element method: a systematic review. JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY, MEDICINE, AND PATHOLOGY 2023. [DOI: 10.1016/j.ajoms.2023.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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Jiang J, Sun J, Ma H, Wang J, Huang Z, Zhou S. Stress intensity factor of a cracked molar restored with different materials and designs: A 3D-FEA. J Mech Behav Biomed Mater 2023; 142:105818. [PMID: 37068432 DOI: 10.1016/j.jmbbm.2023.105818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/26/2023] [Accepted: 03/30/2023] [Indexed: 04/03/2023]
Abstract
OBJECTIVE This work used 3D finite element analysis (FEA) to analyze and directly compare the stress intensity factor (SIF) and stress distribution at the crack tip of identical cracked tooth models restored with different materials and crown parameters. METHODS A 3D model of the cracked tooth was generated. Then, we applied 25 restorative models, including three parameters (shoulder height, width, and degree of polymerization), five restorative materials (GC, IPS, LU, ZC, VE), and two combinations of types of cement (RMGIC and GIC). An occlusal load of 800N was applied to the spherical part along the longitudinal axis. The stress distribution of the preparation and the SIF of the crack tip was analyzed. RESULTS The crack tip SIF was minimal for a shoulder height offset of 0.8 mm (P = 0.032), a shoulder width of 0.6 mm (P = 0.045), a crown material of ZC (P < 2e-16), and a cement material of RMGIC (P < 0.05), respectively. In contrast, the effect of different polymerization degrees on SIF was insignificant (P = 0.95). CONCLUSION Our results suggest that the selection of a larger modulus of elasticity (MOE) material for the crown, the preparation of a smaller shoulder width within a safe range, a reasonable increase in the crown length, and the selection of adhesive materials with high fracture toughness are favorable methods to prevent further crack extension.
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Affiliation(s)
- Jingang Jiang
- Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, Heilongjiang, PR China; Robotics & Its Engineering Research Center, Harbin University of Science and Technology, Harbin, 150080, China.
| | - Jianpeng Sun
- Robotics & Its Engineering Research Center, Harbin University of Science and Technology, Harbin, 150080, China
| | - Hongyuan Ma
- Harbin Branch of Taili Communication Technology Limited, China Electronics Technology Group Corporation, Harbin, 150080, Heilongjiang, People's Republic of China
| | - Jingchao Wang
- The Second Affiliated Hospital of Harbin Medical University, Harbin, 150081, Heilongjiang, PR China
| | - Zhiyuan Huang
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, PR China
| | - Shan Zhou
- The Second Affiliated Hospital of Harbin Medical University, Harbin, 150081, Heilongjiang, PR China.
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Effect of the Combination of Restorative Material and the Etching Protocol in Enamel Microleakage in Class II Cavities after Thermocycling. BIOMED RESEARCH INTERNATIONAL 2023; 2023:1354738. [PMID: 36820225 PMCID: PMC9938782 DOI: 10.1155/2023/1354738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/31/2023] [Accepted: 02/01/2023] [Indexed: 02/12/2023]
Abstract
This study is aimed at evaluating the marginal microleakage of bulk-fill class II restorations after thermocycling. Thirty-two human third molars received class II cavities prepared on mesial and distal faces. The cavities were bonded according to the adhesive protocol (total or self-etching). The cavities were then restored with composite and divided into 8 groups based on the composite combination: layering technique with Filtek Z350XT (G1 and G5), first layer with Filtek Z350 XT Flowable Restorative and then Filtek Z350XT (G2 and G6), bulk-fill technique with Filtek One Bulk Fill (G3 and G7), and first layer with Filtek One Bulk Fill Flow and Filtek Z350 XT (G4 and G8). The restorations were then subjected to thermocycling (2000 cycles, 5°C and 55°C, dwell time of 30 s). After aging, the restored teeth were immersed in methylene blue for 48 hours. The restorations (n = 32) were sectioned in the middle (two sections). The microleakage results were analyzed by two-way ANOVA followed by Tukey's post hoc test (α = 0.05). The groups did not differ statistically from each other in terms of marginal microleakage (p = 0.295). It can be concluded that there is no difference in the percentage of microleakage between conventional and bulk-fill resins on both consistencies, as well as there is also no statistically significant difference when the adhesive system is used in a conventional or self-etching mode.
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Sharma S, Ramesh S, Rayapudi J. Biomechanical Performance of Mandibular Molars with Deep Mesio-Occlusal-Distal Cavities Rehabilitated with Horizontal Posts: A 3D Finite Element Analysis. Int J Dent 2023; 2023:3379373. [PMID: 37095899 PMCID: PMC10122578 DOI: 10.1155/2023/3379373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 02/04/2023] [Accepted: 02/27/2023] [Indexed: 04/26/2023] Open
Abstract
Aim To compare and contrast by three-dimensional finite element analysis the biomechanical performance of deep mesio-occlusal-distal cavities of mandibular molars reinforced by different sizes of horizontal fiber posts. Materials and Methods The finite element (FE) stress analysis was performed with the ANSYS, a commercial finite element method package. Based on the evidence-based scientific data and on the mechanical properties of materials, i.e., Young's modulus and Poisson ratio, the model of a mandible and mandibular first molar was replicated. The mandibular molar models replicating the clinical scenarios were simulated, designed, and built, assuming all materials to be homogenous, isotropic, and linearly elastic as follows: Model 1 control: the model of an intact first mandibular molar. Model 2: the prepared cavity mesio-occlusal-distal is replicated by the subtraction Boolean method. The remaining thickness of dentin is 1 mm. Model 3: these were rehabilitated by three different diameters of two horizontal fiber posts. Model 3A: fiber post diameter 1 mm, Model 3B: 1.5 mm and Model 3C: 2 mm. The dimensions of the cavity, the intercuspal distance between buccal walls and lingual walls, and the distance of placement of the post from occlusal reference points were all kept constant for all three subgroups of Model 3. The cavities of Model 3 were restored with Filtek bulk-fill posterior composite. After meshing the models, loads were defined on the buccal and lingual distal cusps with a constant value of 600 N and at an angle of 45°. Results The results of finite element analysis are expressed as stresses, i.e., tensile compressive, shear, or a combination known as von Mises stresses. The overall von Mises stresses were as follows: Model 1:154.83 Mpa; Model 2: 376.877 Mpa; Model 3A: 160.221 Mpa; Model 3B: 159.488 Mpa; Model 3C: 147.231 Mpa. Statistical analysis of the compiled data was carried out. It was seen that there was a significant difference in stress values from the intact tooth Model 1 and cavity Model 2 (p < 0.05) with means values of 53.1 and 139.22, respectively. The means of all subgroups were comparable but there was a statistically significant difference between Model 3, i.e., 3A (67.74), Model 3B (60.47), Model 3C (53.70), and Model 2. Model 1 and Model 3C had comparable mean values. Conclusion Rehabilitation of deep mesio-occlusal-distal cavities of molars with intact buccal and lingual walls with the aid of a horizontal post of any diameter has a similar stress distribution to an intact tooth. However, the biomechanical performance of a 2 mm horizontal post was exacting of the natural tooth. Horizontal posts can be included in expanding our restorative option for rehabilitating grossly mutilated teeth.
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Affiliation(s)
- Sonali Sharma
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India
| | - Sindhu Ramesh
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India
| | - Jasmine Rayapudi
- Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India
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Yousief SA, Galal RM, Alsharief HMA, Alharbi TTR, Alzhrani KAA, Migaishet HTA, Alshehri AAA, Nouruldeen AIA, Sait GAS, Jayar Y, Alharthi R, Alotaibi SA. Comparison of Two Types of Preparation for Laminate Veneer with Three Types of All-Ceramic Materials. Eur J Dent 2022; 17:120-126. [PMID: 35820443 PMCID: PMC9949923 DOI: 10.1055/s-0042-1743143] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
OBJECTIVE The objective of this study was to compare types of veneer preparations and their combination with three materials. MATERIALS AND METHODS Two finite element models were specially prepared used representing window and wrap around preparation for veneers. The "central incisor" tooth geometry was acquired using a laser scanner, and then its surface was adjusted to form a solid model prior to the removal of each preparation separately. Three materials (Lava Ultimate, IPS e-max, and Celtra) were tested in combination with the preparation type. Bone geometry was simplified as two coaxial cylinders in all models. Each model was subjected to two loading conditions of occlusion (edge-to-edge bite and normal bite). STATISTICAL ANALYSIS AND RESULTS It was observed that cortical, cancellous bone, and periodontal ligament are insensitive to preparation or materials. Their stresses and deformation were within physiological limits. Significant changes appeared on the central incisor tooth structure, cement layer, and veneer layer stresses and deformations under loading cases. CONCLUSIONS Edge-to-edge bite stresses are severe with window-type preparation, and normal bite did not show any critical values on tooth structure, cement layer, or veneer layer. Veneer layer finish line and its contact with the cement layer and tooth structure play a role in the loading transfer mechanism. Preparation type alters the values of stresses on tooth structure, cement, and veneer layers. With window preparation, extreme stresses appear at finish line, while stresses appear under the loading site with wrap around preparation. Veneer and cement layers withstand the load energy with wrap around preparation and reduce tooth structure stresses. Thus, the lifetime of veneer and cement layers might be longer with window preparation.
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Affiliation(s)
- Salah A. Yousief
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia,Crown and Bridge Department, Faculty of Oral and Dental Medicine, Al Azhar University, Assuit Branch, Egypt,Address for correspondence Salah A. Yousief Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom UniversityRiyadhSaudi Arabia
| | - Rami M. Galal
- Fixed and Removable Prosthodontics Department, National Research Centre, Giza, Egypt,Fixed Prosthodontics Department, AlNahda University, Egypt
| | | | | | | | | | | | | | | | - Yousef Jayar
- Fixed Prosthodontics Department, AlNahda University, Egypt
| | - Reham Alharthi
- Fixed Prosthodontics Department, AlNahda University, Egypt
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15
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Ausiello P, Dal Piva AMDO, di Lauro AE, Garcia-Godoy F, Testarelli L, Tribst JPM. Mechanical Behavior of Alkasite Posterior Restorations in Comparison to Polymeric Materials: A 3D-FEA Study. Polymers (Basel) 2022; 14:polym14081502. [PMID: 35458251 PMCID: PMC9024758 DOI: 10.3390/polym14081502] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 03/31/2022] [Accepted: 04/05/2022] [Indexed: 01/27/2023] Open
Abstract
The present investigation evaluated the effect of the combination of different dental filling materials in Class I cavities under occlusal loading using three-dimensional finite elements analysis (FEA). Six computer-generated and restored models of a lower molar were created in the CAD software and compared according to the biomechanical response during chewing load condition. Two adhesively bonded bulk restorative materials [bulk-fill resin composite (BF) or Alkasite (Alk)] were evaluated with or without the presence of a base material below (flowable resin composite or glass ionomer cement). A food bolus was placed on the occlusal surface mimicking the compressive occlusal load (600 N) during the static linear analysis. The maximum principal stress (tensile) was calculated as stress criteria in enamel, dentin and restoration. All models showed high stresses along the enamel/restoration margin with a similar stress trend for models restored with the same upper-layer material. Stress values up to 12.04 MPa (Alk) or up to 11.12 MPa (BF) were recorded at the enamel margins. The use of flexible polymeric or ionic base material in combination with bulk-fill resin composite or Alk did not reduce the stress magnitude in dentine and enamel. Class I cavities adhesively restored with bulk-fill resin composite showed lighter stress concentration as well as Alk. Therefore, adhesively bonded Alk restoration showed a promising mechanical behavior when used with different base materials or as a bulk restoration for posterior Class I cavity.
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Affiliation(s)
- Pietro Ausiello
- School of Dentistry, University of Naples Federico II, Via S. Pansini 5, 80131 Naples, Italy;
- Correspondence:
| | - Amanda Maria de Oliveira Dal Piva
- Academic Centre for Dentistry Amsterdam (ACTA), Department of Dental Materials, University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (A.M.d.O.D.P.); (J.P.M.T.)
| | | | - Franklin Garcia-Godoy
- Department of Bioscience Research, College of Dentistry—University of Tennessee Health Science Center, Memphis, TN 38163, USA;
| | - Luca Testarelli
- Department of Oral and Maxillofacial Sciences, La Sapienza University of Rome, 00161 Rome, Italy;
| | - João Paulo Mendes Tribst
- Academic Centre for Dentistry Amsterdam (ACTA), Department of Dental Materials, University of Amsterdam and Vrije Universiteit Amsterdam, 1081 LA Amsterdam, The Netherlands; (A.M.d.O.D.P.); (J.P.M.T.)
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16
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Fonseca GL, Neto NTL, Prieto MGDL, Azevedo F, Harrop C, Oliveira N. Effect of the bracketless orthodontics technique and resin composite material on the biomechanical response of the upper central incisor: 3D finite element analysis. APOS TRENDS IN ORTHODONTICS 2021. [DOI: 10.25259/apos_89_2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Objectives:
The bracketless orthodontic treatment (BOT) is an alternative technique which indicates using an orthodontic appliance composed of wires and composite resin assisted by 3D technology. However, the biomechanical response of central incisor orthodontic movement has yet to be investigated. Thus, the aim of the present investigation was to calculate the stress magnitude in central incisor movement through 3D finite element analysis using different wire diameters (0.012”, 0.014”, and 0.016”) of nickel–titanium wire and two different resin composites (Opallis and Filtek).
Materials and Methods:
A 3D volume composed of enamel, dentin, cortical bone, cancellous bone, periodontal ligament, composite resin, and different orthodontic wire diameters was designed. After the modeling process, the models were exported to computer-aided engineering software divided into a finite number of elements, and a mechanical structural static analysis was conducted.
Results:
The stress results were plotted on colorimetric maps and in tables for comparison between the different models. The results showed that the central incisor orthodontic movement with BOT does not induce damage to the periodontal ligament, dental root, or bone tissue, regardless of the simulated orthodontic wire diameter and resin composite materials. The palatal composite resin and orthodontic wire also presented acceptable stress magnitude during orthodontic movement.
Conclusion:
Thus, the BOT technique promoted a suitable biomechanical response during central incisor movement regardless the resin composite.
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Affiliation(s)
| | | | | | - Felipe Azevedo
- Department of Orthodontics, University of Sete Lagoas (FACSETE), Brazil,
| | - Cristina Harrop
- Department of Orthodontics, University of Sete Lagoas (FACSETE), Brazil,
| | - Nivaldo Oliveira
- Department of Orthodontics, University of Sete Lagoas (FACSETE), Brazil,
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Ausiello P, Tribst JPM, Ventre M, Salvati E, di Lauro AE, Martorelli M, Lanzotti A, Watts DC. The role of cortical zone level and prosthetic platform angle in dental implant mechanical response: A 3D finite element analysis. Dent Mater 2021; 37:1688-1697. [PMID: 34497022 DOI: 10.1016/j.dental.2021.08.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/27/2021] [Accepted: 08/27/2021] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the influence of three different dental implant neck geometries, under a combined compressive/shear load using finite element analysis (FEA). The implant neck was positioned in D2 quality bone at the crestal level or 2 mm below. METHODS One dental implant (4.2 × 9 mm) was digitized by reverse engineering techniques using micro CT and imported into Computer Aided Design (CAD) software. Non-uniform rational B-spline surfaces were reconstructed, generating a 3D volumetric model similar to the digitized implant. Three different models were generated with different implant neck configurations, namely 0°, 10° and 20°. D2 quality bone, composed of cortical and trabecular structure, was modeled using data from CT scans. The implants were included in the bone model using a Boolean operation. Two different fixture insertion depths were simulated for each implant: 2 mm below the crestal bone and exactly at the level of the crestal bone. The obtained models were imported to FEA software in STEP format. Von Mises equivalent strains were analyzed for the peri-implant D2 bone type, considering the magnitude and volume of the affected surrounding cortical and trabecular bone. The highest strain values in both cortical and trabecular tissue at the peri-implant bone interface were extracted and compared. RESULTS All implant models were able to distribute the load at the bone-implant contact (BIC) with a similar strain pattern between the models. At the cervical region, however, differences were observed: the models with 10° and 20° implant neck configurations (Model B and C), showed a lower strain magnitude when compared to the straight neck (Model A). These values were significantly lower when the implants were situated at crestal bone levels. In the apical area, no differences in strain values were observed. SIGNIFICANCE The implant neck configuration influenced the strain distribution and magnitude in the cortical bone and cancellous bone tissues. To reduce the strain values and improve the load dissipation in the bone tissue, implants with 10° and 20 neck configuration should be preferred instead of straight implant platforms.
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Affiliation(s)
- Pietro Ausiello
- School of Dentistry, University of Naples Federico II, via S. Pansini 5, 80131 Naples, Italy.
| | | | - Maurizio Ventre
- Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, 80125 Naples, Italy; Center for Advanced Biomaterials for HealthCare@CRIB, Istituto Italiano di Tecnologia, 80125 Naples, Italy
| | - Enrico Salvati
- Polytechnic Department of Engineering and Architecture (DPIA), University of Udine, Via delle Scienze 206, Udine, Italy
| | - Alessandro E di Lauro
- School of Dentistry, University of Naples Federico II, via S. Pansini 5, 80131 Naples, Italy
| | - Massimo Martorelli
- Fraunhofer JL IDEAS, Department of Industrial Engineering, University of Naples Federico II, Naples, 80125, Italy
| | - Antonio Lanzotti
- Fraunhofer JL IDEAS, Department of Industrial Engineering, University of Naples Federico II, Naples, 80125, Italy
| | - David C Watts
- School of Medical Sciences and Photon Science Institute, University of Manchester, UK
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Effect of Direct and Indirect Materials on Stress Distribution in Class II MOD Restorations: A 3D-Finite Element Analysis Study. BIOMED RESEARCH INTERNATIONAL 2021; 2020:7435054. [PMID: 33381580 PMCID: PMC7755472 DOI: 10.1155/2020/7435054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 12/02/2020] [Accepted: 12/05/2020] [Indexed: 11/18/2022]
Abstract
The aim of this study is to investigate the stress distributions of different restoration options for class II mesio-occluso-distal (MOD) cavities. A class II MOD cavity with proximal box gingival floor 1 mm below cementoenamel junction was designed in a mandibular first molar tooth model. 3D finite-element analysis (FEA) and 3D-CAD modelling were used to examine the occlusal stresses distributed to the remaining buccal enamel (RBE), remaining lingual enamel (RLE), adhesive surfaces, and restorative materials by direct and indirect materials resulting from a 600 N of static occlusal load stimulating foodstuff. von Mises (VM) and maximum principal (Pmax) stresses were evaluated for two CAD/CAM materials and three direct materials. CAD/CAM materials exerted less stress than the direct restorative materials. Significant von Mises and Pmax stress value differences were seen among all restoration models on RBE. Reducing RLE and including it into the cavity would be a more effective option for this model in this scenario. As VM and Pmax stresses of PIHC CAD/CAM material for RBE and dentin were significantly lower than other tested materials, it may be the choice of material for indirect MOD restorations.
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Matuda AGN, Silveira MPM, de Andrade GS, Piva AMDOD, Tribst JPM, Borges ALS, Testarelli L, Mosca G, Ausiello P. Computer Aided Design Modelling and Finite Element Analysis of Premolar Proximal Cavities Restored with Resin Composites. MATERIALS 2021; 14:ma14092366. [PMID: 34062936 PMCID: PMC8125402 DOI: 10.3390/ma14092366] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 04/26/2021] [Accepted: 04/27/2021] [Indexed: 12/22/2022]
Abstract
This study evaluated the stress distribution in five different class II cavities of premolar models restored with conventional or bulk-fill flowable composite by means of finite element analysis (FEA) under shrinkage and occlusal loading. An upper validated premolar model was imported in the software, and five class II cavities with different occlusal extensions and dimensions were prepared: horizontal cavity on the mesial surface (horizontal slot), mesio-occlusal cavity, mesial cavity (vertical slot), tunnel type cavity and direct access cavity. The models were restored with conventional or bulk-fill flowable resin composite. The tested materials were considered as homogeneous, linear, and isotropic. The Maximum Principal Stress criteria was chosen to evaluate the tensile stress results. The lowest shrinkage stress value was observed in the direct access cavity restored with bulk-fill flowable resin composite (36.12 MPa). The same cavity, restored with conventional composite showed a score of 36.14 MPa. The horizontal slot cavity with bulk-fill flowable showed a score of 46.71 MPa. The mesio-occlusal cavity with bulk-fill flowable had a score of 53.10 MPa, while with conventional composite this was 55.35 MPa. Higher shrinkage stress was found in the vertical slot cavity with conventional resin 56.14 MPa, followed by the same cavity with bulk-fill flowable 56.08 MPa. Results indicated that the use of bulk-fill flowable composite resin more significantly decreased the polymerization shrinkage stress magnitude. The larger the cavity and the volume of material necessary to restore the tooth, the greater the residual stress on enamel and dentin tissue.
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Affiliation(s)
- Amanda Guedes Nogueira Matuda
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP 12245-000, Brazil; (A.G.N.M.); (M.P.M.S.); (G.S.d.A.); (A.M.d.O.D.P.); (A.L.S.B.)
| | - Marcos Paulo Motta Silveira
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP 12245-000, Brazil; (A.G.N.M.); (M.P.M.S.); (G.S.d.A.); (A.M.d.O.D.P.); (A.L.S.B.)
| | - Guilherme Schmitt de Andrade
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP 12245-000, Brazil; (A.G.N.M.); (M.P.M.S.); (G.S.d.A.); (A.M.d.O.D.P.); (A.L.S.B.)
| | - Amanda Maria de Oliveira Dal Piva
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP 12245-000, Brazil; (A.G.N.M.); (M.P.M.S.); (G.S.d.A.); (A.M.d.O.D.P.); (A.L.S.B.)
| | | | - Alexandre Luiz Souto Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, SP 12245-000, Brazil; (A.G.N.M.); (M.P.M.S.); (G.S.d.A.); (A.M.d.O.D.P.); (A.L.S.B.)
| | - Luca Testarelli
- Department of Oral and Maxillo Facial Sciences, “Sapienza” University of Rome, 00161 Rome, Italy;
| | - Gabriella Mosca
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, School of Dentistry, University of Naples Federico II, 80138 Naples, Italy;
| | - Pietro Ausiello
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, School of Dentistry, University of Naples Federico II, 80138 Naples, Italy;
- Correspondence:
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Gomes de Carvalho AB, de Andrade GS, Mendes Tribst JP, Grassi EDA, Ausiello P, Saavedra GDSFA, Bressane A, Marques de Melo R, Borges ALS. Mechanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molars. MATERIALS 2021; 14:ma14081923. [PMID: 33921347 PMCID: PMC8070423 DOI: 10.3390/ma14081923] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 11/24/2022]
Abstract
This study evaluated the effect of the combination of three different onlay preparation designs and two restorative materials on the stress distribution, using 3D-finite element analysis. Six models of first lower molars were created according to three preparation designs: non-retentive (nRET), traditional with occlusal isthmus reduction (IST), and traditional without occlusal isthmus reduction (wIST); and according to two restorative materials: lithium-disilicate (LD) and nanoceramic resin (NR). A 600 N axial load was applied at the central fossa. All solids were considered isotropic, homogeneous, and linearly elastic. A static linear analysis was performed, and the Maximum Principal Stress (MPS) criteria were used to evaluate the results and compare the stress in MPa on the restoration, cement layer, and tooth structure (enamel and dentin). A novel statistical approach was used for quantitative analysis of the finite element analysis results. On restoration and cement layer, nRET showed a more homogeneous stress distribution, while the highest stress peaks were calculated for LD onlays (restoration: 69–110; cement layer: 10.2–13.3). On the tooth structure, the material had more influence, with better results for LD (27–38). It can be concluded that nRET design showed the best mechanical behavior compared to IST and wIST, with LD being more advantageous for tooth structure and NR for the restoration and cement layer.
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Affiliation(s)
- Ana Beatriz Gomes de Carvalho
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
| | - Guilherme Schmitt de Andrade
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
| | - João Paulo Mendes Tribst
- Graduate Program in Dentistry, Department Dentistry, University of Taubate (UNITAU), Taubate 12020-270, Brazil;
| | - Elisa Donária Aboucauch Grassi
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
| | - Pietro Ausiello
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, School of Dentistry, University of Naples Federico II, 80138 Naples, Italy
- Correspondence:
| | - Guilherme de Siqueira Ferreira Anzaloni Saavedra
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
| | - Adriano Bressane
- Graduate Oral Health Applied Science, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil;
| | - Renata Marques de Melo
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
| | - Alexandre Luiz Souto Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, Brazil; (A.B.G.d.C.); (G.S.d.A.); (E.D.A.G.); (G.d.S.F.A.S.); (R.M.d.M.); (A.L.S.B.)
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21
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Lithium Disilicate Ceramic Endocrown Biomechanical Response According to Different Pulp Chamber Extension Angles and Filling Materials. MATERIALS 2021; 14:ma14051307. [PMID: 33803194 PMCID: PMC7963147 DOI: 10.3390/ma14051307] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/02/2021] [Accepted: 03/04/2021] [Indexed: 12/28/2022]
Abstract
The purpose of this study is to evaluate the effect of pulp chamber extension angles and filling material mechanical properties on the biomechanical response of a ceramic endocrown. A 3D model of maxillary molar that underwent endodontically treatment was exported to computer aided design software to conduct finite element analysis (FEA). The endocrown model was modified considering different pulp chamber extension angles (right angle; 6°, 12° and 18° of axial divergence). The solids were imported into the computer aided engineering software in Standard for the Exchange of Product Data (STEP) format. Nine different filling materials were simulated to seal the orifice of the root canal system under each endocrown restoration (resin composite, bulk-fill resin composite, alkasite, flowable resin composite, glass ionomer cement, autocured resin-reinforced glass ionomer cement, resin cement, bulk-fill flowable resin composite, zinc oxide cement), totaling 36 models. An axial load (300 N) was applied at the occlusal surface. Results were determined by colorimetric graphs of von-Misses stress (VMS) and Maximum Principal Stress (MPS) on tooth, cement layer, and endocrown restorations. VMS distribution showed a similar pattern between the models, with more stress at the load region for the right-angled endocrowns. The MPS showed that the endocrown intaglio surface and cement layer showed different mechanical responses with different filing materials and pulp chamber angles. The stress peaks plotted in the dispersion plot showed that the filling material stiffness is proportional to the stress magnitude in the endocrown, cement layer and tooth adhesive surface. In addition, the higher the pulp chamber preparation angle, the higher the stress peak in the restoration and tooth, and the lower the stress in the cement layer. Therefore, 6° and 12° pulp chamber angles showed more promising balance between the stresses of the adhesive interface structures. Under the conditions of this study, rigid filling materials were avoided to seal the orifice of root canal system when an endocrown restoration was planned as rehabilitation. In addition, the pulp chamber axial walls were prepared between 6° and 12° of divergence to balance the stress magnitude in the adhesive interface for this treatment modality.
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Effect of Shrinking and No Shrinking Dentine and Enamel Replacing Materials in Posterior Restoration: A 3D-FEA Study. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11052215] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The aim of the present study was to investigate the effect of shrinking and no shrinking dental filling materials combination in posterior restorations under the combined effects of polymerization shrinkage and occlusal load by means of 3D Finite Elements Analysis. Six computer-generated and restored class I or class II cavities models of a lower molar were designed in the CAD software and evaluated according to the cavity and restorative procedure. Different shrinking and no shrinking adhesive materials combination with diverse Young’s modulus were considered. A food bolus was modeled on the occlusal surface replicating the chewing load using static linear analyses Polymerization shrinkage was simulated for the shrinking different restorative materials. The maximum principal stress was selected as analysis criteria. All models exhibited higher stresses along the dentine restoration interfaces with different magnitude and a similar stress trend along enamel restoration interface. Stress values up to 22 MPa and 19 MPa were recorded in the enamel and restoration, respectively. The use of elastic not shrinking material layer in combination with bulk fill composite reduced the stress magnitude in dentine and enamel to replace dental tissues. Class I and class II posterior cavities adhesively restored with shrinking filling material’s combination showed the most unfavorable stress concentrations and the multilayer technique is a promising restorative alternative in posterior adhesive restorations when deep dentin and enamel volumes are missing.
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Influence of Polymeric Restorative Materials on the Stress Distribution in Posterior Fixed Partial Dentures: 3D Finite Element Analysis. Polymers (Basel) 2021; 13:polym13050758. [PMID: 33670991 PMCID: PMC7957672 DOI: 10.3390/polym13050758] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/12/2021] [Accepted: 02/12/2021] [Indexed: 01/06/2023] Open
Abstract
Background: This study evaluated the effect of interim restorative materials (acrylic resin (AR), resin composite (RC) or polyetheretherketone (PEEK) for dental computer-aided design/computer-aided manufacturing (CAD/CAM)) on the stress distribution of a posterior three-unit fixed partial denture. Methods: The abutment teeth (first molar and first premolar) were modeled using the BioCAD protocol containing 1.5 mm of axial reduction and converging axial walls. A static structural analysis was performed in the computer-aided engineering software, and the Maximum Principal Stress criterion was used to analyze the prosthesis and the cement layers of both abutment teeth. The materials were considered isotropic, linearly elastic, homogeneous and with bonded contacts. An axial load (600 N) was applied to the occlusal surface of the second premolar. Results: Regardless of the restorative material, the region of the prosthetic connectors showed the highest tensile stress magnitude. The highest stress peak was observed with the use of RC (129 MPa) compared to PEEK and AR. For the cement layers, RC showed the lowest values in the occlusal region (7 MPa) and the highest values for the cervical margin (14 MPa) compared to PEEK (21 and 12 MPa) and AR (21 and 13 MPa). Conclusions: Different interim restorative materials for posterior fixed partial dentures present different biomechanical behavior. The use of resin composite can attenuate the stress magnitude on the cement layer, and the use of acrylic resin can attenuate the stress magnitude on the connector region.
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Tribst JPM, Borges ALS, Silva-Concílio LR, Bottino MA, Özcan M. Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D-FEA Study. MATERIALS 2021; 14:ma14030649. [PMID: 33572533 PMCID: PMC7866804 DOI: 10.3390/ma14030649] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/22/2021] [Accepted: 01/26/2021] [Indexed: 12/14/2022]
Abstract
The goal of this study was to evaluate the stress distribution in an endocrown restoration according to different provisional restorative materials. An endodontically treated maxillary molar model was selected for conducting the finite element analysis (FEA), with a determined amount of dental remnant of 1.5 mm. The model was imported to the analysis software (ANSYS 19.2, ANSYS Inc., Houston, TX, USA) in STEP format. All contacts were considered perfectly bonded. The mechanical properties of each structure were considered isotropic, linear, elastic, and homogeneous. Three different provisional restorative materials were simulated (acrylic resin, bis-acrylic resin, and resin composite). An axial load (300 N) was applied at the occlusal surface in the center of the restoration. Results were determined by colorimetric stress maps of maximum principal stress, maximum shear stress, and total deformation. The different materials influenced the stress distribution for all structures; the higher the material’s elastic modulus, the lower the stress magnitude on the cement layer. In the present study, all provisional restorative materials showed similar stress patterns in the endocrown and on the cement layer however, with different magnitude. Based on this study limitation, the use of resin composite to manufacture provisional endocrowns is suggested as a promising material to reduce the stresses in the cement layer and in the dental tissue surfaces.
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Affiliation(s)
- João Paulo Mendes Tribst
- School of Dentistry, University of Taubaté, Taubaté, São Paulo 12020-340, Brazil; (J.P.M.T.); (L.R.S.-C.)
| | - Alexandre Luiz Souto Borges
- Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220-690, Brazil; (A.L.S.B.); (M.A.B.)
| | | | - Marco Antonio Bottino
- Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220-690, Brazil; (A.L.S.B.); (M.A.B.)
| | - Mutlu Özcan
- Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland
- Correspondence:
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de Andrade GS, Pinto ABA, Tribst JPM, Chun EP, Borges ALS, de Siqueira Ferreira Anzaloni Saavedra G. Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study. Comput Methods Biomech Biomed Engin 2021; 24:1026-1034. [PMID: 33410710 DOI: 10.1080/10255842.2020.1866561] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This study evaluated the polymerization shrinkage stress of three tooth preparation designs for indirect ceramic overlay by finite element analysis: isthmus preparation (IST); without isthmus preparation (wIST); and non-retentive preparation (nRET). The models were created based in prepared dental typodonts and were digitally impressed with an intraoral scanner. The interfaces in all models were considered perfectly bonded and all materials were considered homogeneous, linear, and isotropic. The polymerization shrinkage of the cement layer (100 µm) was simulated and evaluated by maximum principal stress criteria. The stress peaks followed this sequence: restoration = IST (13.4 MPa) > wIST (9.3 MPa) > nRET (9 MPa); cement layer = IST (16.9 MPa) > wIST (12.6 MPa) > nRET (10-7.5 MPa); and teeth = IST (10.7 MPa) > wIST (10.5 MPa) > (9 MPa). For the cement layer, the non-retentive preparation (nRET) had the lowest shrinkage stress from all the groups, obtaining a more homogeneous stress distribution on the cement surface. Regarding the abutment teeth, the IST generated a higher shrinkage stress area on the dental structure, concentrating higher stress magnitude at the axiopulpar and axiogingival angles. Non-retentive preparation seems to reduce polymerization shrinkage stress.
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Affiliation(s)
- Guilherme Schmitt de Andrade
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil
| | - Alana Barbosa Alves Pinto
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil
| | - João Paulo Mendes Tribst
- Departament of Dentistry, Postgraduate Program in Dentistry, University of Taubaté (UNITAU), Taubaté, Brazil
| | | | - Alexandre Luiz Souto Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil
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