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Pucci CR, Mafetano APVP, Borges ALS, de Andrade GS, Dal Piva AMDO, Kleverlaan CJ, Tribst JPM. Substrate Rigidity Effect on CAD/CAM Restorations at Different Thicknesses. Eur J Dent 2023; 17:1020-1028. [PMID: 36513340 PMCID: PMC10756807 DOI: 10.1055/s-0042-1757910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVES This article evaluated the effect of substrates rigidities on the post-fatigue fracture resistance of adhesively cemented simplified restorations in lithium disilicate glass ceramic. METHODS Precrystalized computer-aided design/computer-aided manufacturing ceramic blocks were processed into disc-shaped specimens (n = 10, Ø = 10 mm), mimicking a simplified restoration at two thicknesses (0.5 and 1.0 mm). Thereafter, the discs were cemented onto different base substrates (dentin analogue [control], dentin analogue with a central core build-up of resin composite [RC], or glass ionomer cement [GIC]). The specimens were subjected to mechanical cycling in a chewing simulator (100 N, 1 × 106 cycles, 4 Hz) and then subjected to thermocycling aging (10,000 cycles, 5/37/55°C, 30 seconds). After the fatigue protocol, the specimens were loaded until failure (N) in a universal testing machine. Finite element analysis calculated the first principal stress at the center of the adhesive interface. RESULTS The results showed that "restoration thickness," "type of substrate," and their interaction were statistically significant (one-way analysis of variance; p < 0.001). Regardless the restoration thickness a higher fracture load was observed for specimens cemented to dentin analogue. Among the base materials, RC build-up presented the highest fracture load and lower stress magnitude for both restoration thicknesses in comparison with GIC build-up. The 0.5-mm restoration showed higher stress peak and lower fracture load when submitted to the compressive test. CONCLUSION More flexible base material reduces the fracture load and increases the stress magnitude of adhesively cemented lithium disilicate restorations regardless the ceramic thickness. Therefore, more rigid substrates are suggested to be used to prevent restoration mechanical failures.
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Affiliation(s)
- César Rogério Pucci
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, Brazil
| | - Ana Paula Valente Pinho Mafetano
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, Brazil
| | - Alexandre Luiz Souto Borges
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, Brazil
| | | | - Amanda Maria de Oliveira Dal Piva
- Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands
| | - Cornelis J. Kleverlaan
- Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands
| | - João Paulo Mendes Tribst
- Department of Oral Regenerative Medicine, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, The Netherlands
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Pacquet W, Tapie L, Mawussi B, Boitelle P. Volumetric and dimensional accuracy assessment of CAD-CAM-manufactured dental prostheses from different materials. J Prosthet Dent 2023; 129:150-159. [PMID: 34330531 DOI: 10.1016/j.prosdent.2021.05.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 05/18/2021] [Accepted: 05/18/2021] [Indexed: 01/18/2023]
Abstract
STATEMENT OF PROBLEM In computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry, the CAD of the prosthesis represents the clinical prerequisite design to restore the treated tooth. However, how closely the CAM prosthesis shape matches the CAD, particularly in relation to different materials, is unclear. PURPOSE The purpose of this in vitro study was to evaluate onlays designed and manufactured with the same CAD-CAM system but manufactured with different materials. MATERIAL AND METHODS A single standard tessellation language (STL) model was used to produce 6 composite resin onlays, 6 leucite glass-ceramic onlays, and 6 lithium disilicate glass-ceramic onlays. The onlays were digitized by using an X-ray microtomographic protocol with a metrological calibration. The CAD model was then compared with the scans of the different onlays. An analysis by region of interest was then carried out to assess the accuracy and reliability of the dimensional accuracy. RESULTS The composite resin and the lithium disilicate glass-ceramic had the best dimensional accuracy. The leucite glass-ceramic exhibited a lack of trueness linked to consistent overmilling. The composite resin had less peripheral chipping than the glass-ceramics. CONCLUSIONS The composite resin and the lithium disilicate glass-ceramic material exhibited satisfactory dimensional accuracy. Milling the glass-ceramic before crystallization considerably improved dimensional accuracy.
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Affiliation(s)
- William Pacquet
- Assistant Professor, Oral rehabilitation Department, Faculty of Dentistry, University Lille Nord de France, Paris, France.
| | - Laurent Tapie
- Senior Lecturer, Mechanical engineering Department, University Sorbonne Paris Nord, Paris, France
| | - Bernardin Mawussi
- Professor and Senior Lecturer, Mechanical engineering Department, University Sorbonne Paris Nord, Paris, France
| | - Philippe Boitelle
- Senior Lecturer, Oral rehabilitation Department, Faculty of Dentistry, University Lille Nord de France, Paris, France
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Yu P, Xiong Y, Zhao P, Yu H, Arola D, Gao S. Ceramic Inlay Bonded Interfaces in Minimally Invasive Preparations: Damage and Contributing Mechanisms in Sliding Contact. Oper Dent 2021; 47:E1-E11. [PMID: 34843621 DOI: 10.2341/20-144-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/24/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND In the preparation of inlay cavities, a choice must be made between conventional standard and minimally invasive preparation designs; in the long run, this choice can affect the integrity of the bonded interface. PURPOSE To evaluate the effect of minimally invasive cavity preparation designs on the extent and contributing mechanisms of damage to ceramic inlay bonded interfaces. METHODS AND MATERIALS Tooth blocks with 90°, 120° and 75° marginal angles were prepared, representing tooth cavities with conventional standard and minimally invasive preparations with large divergence and convergence angles and bonded to monolithic ceramic (IPS e.max CAD). Vickers indentations were placed at various distances from the bonded interface. The indentation morphology and crack length were observed. Reciprocating wear tests were performed on the bonded interface with a 20-newton (N) vertical load. The wear depth and wear-scar morphology were characterized after increments of cyclic sliding contact. RESULTS The 120° group exhibited longer indentation cracks in the ceramic, whereas the 75° group showed larger indentations in the enamel when compared to the 90° group (p<0.001). Consistent with the weaker edge crack resistance, the 120° group experienced the greatest wear (p=0.008), and the wear depth in the enamel of the 75° group exceeded that of the 90° group (p<0.001) in the early stage (5×102 cycles). However, no significant difference in the wear depth (p>0.147) and morphology were found at the later wear stage among the three groups. CONCLUSION Within the limitations of this study, minimally invasive preparations with 120° and 75° marginal angles can result in early sever damage at the ceramic inlay bonded interface but show comparable wear behaviors to the conventional 90° group at the later stage.
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Affiliation(s)
- P Yu
- Ping Yu, PhD, DDS, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Y Xiong
- Yuhuan Xiong, MD, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - P Zhao
- Peng Zhao, MD, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - H Yu
- Haiyang Yu, PhD, DDS, professor, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - D Arola
- Dwayne Arola, PhD, professor, Department of Materials Science and Engineering, Department of Oral Health Sciences, Department of Restorative Dentistry, University of Washington, Seattle, WA, USA
| | - S Gao
- *Shanshan Gao, PhD, DDS, associate professor, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Fan J, Xu Y, Si L, Li X, Fu B, Hannig M. Long-term Clinical Performance of Composite Resin or Ceramic Inlays, Onlays, and Overlays: A Systematic Review and Meta-analysis. Oper Dent 2021; 46:25-44. [PMID: 33882133 DOI: 10.2341/19-107-lit] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2020] [Indexed: 11/23/2022]
Abstract
CLINICAL RELEVANCE Composite resin or ceramic inlays, onlays, and overlays can achieve high long-term survival and success rates. SUMMARY
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Limjeerajarus N, Dhammayannarangsi P, Phanijjiva A, Tangsripongkul P, Jearanaiphaisarn T, Pittayapat P, Limjeerajarus CN. Comparison of ultimate force revealed by compression tests on extracted first premolars and FEA with a true scale 3D multi-component tooth model based on a CBCT dataset. Clin Oral Investig 2019; 24:211-220. [PMID: 31079245 DOI: 10.1007/s00784-019-02919-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 04/29/2019] [Indexed: 12/28/2022]
Abstract
OBJECTIVE The aim of this study was to develop a new method for creating a multi-component and true scale 3-dimensional (3D) model of a human tooth based on cone-beam computed tomography (CBCT) images. MATERIALS AND METHODS First maxillary premolar tooth model was reconstructed from a patient's CBCT images. The 2D serial sections were used to create the 3D model. This model was used for finite element analysis (FEA). Model validation was performed by comparing the ultimate compressive force (UF) obtained experimentally using a universal testing machine and from simulation. The simulations of three component-omitting models (silicone, cementum, and omitting both) were performed to analyze the maximum (max.) principal stress and stress distribution. RESULTS The simulation-based UF indicating tooth fracture was 637 N, while the average UF in the in vitro loading was 651 N. The discrepancy between the simulation-based UF and the experimental UF was 2.2%. From the simulation, the silicone-omitting models showed a significant change in max. principal stress, resulting in a UF error of 26%, whereas there was no notable change in the cementum-omitting model. CONCLUSION This study, for the first time, developed a true scale multi-component 3D model from CBCT for predicting stress distribution in a human tooth. CLINICAL RELEVANCE This study proposed a method to create 3D modeling from CBCT in a true scale and multi-component manner. The PDL-like component-omitting simulation led to a higher error value of UF, indicating the importance of multi-component tooth modeling in FEA. Tooth 3D modeling could help determine mechanical failure in dental treatments in a more precise manner.
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Affiliation(s)
- Nuttapol Limjeerajarus
- Research Center for Advanced Energy Technology, Faculty of Engineering, Thai-Nichi Institute of Technology, Bangkok, 10250, Thailand
| | - Phetcharat Dhammayannarangsi
- Research Center for Advanced Energy Technology, Faculty of Engineering, Thai-Nichi Institute of Technology, Bangkok, 10250, Thailand
| | - Anon Phanijjiva
- Research Center for Advanced Energy Technology, Faculty of Engineering, Thai-Nichi Institute of Technology, Bangkok, 10250, Thailand
| | - Pavita Tangsripongkul
- Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Thanomsuk Jearanaiphaisarn
- Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Pisha Pittayapat
- Department of Radiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Chalida Nakalekha Limjeerajarus
- Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand. .,Center of Excellence for Regenerative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand.
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Influence of Preparation Reconstruction on the Compressive Strength of CAD/CAM Ceramic Inlays. Int J Biomater 2019; 2019:7307649. [PMID: 30713558 PMCID: PMC6333008 DOI: 10.1155/2019/7307649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 12/10/2018] [Indexed: 02/04/2023] Open
Abstract
The aim of this study was to evaluate whether the compressive strength of lithium dissilicate ceramic inlays is influenced by the substrate (dentin or composite resin build-up) and to compare it to nonrestored teeth. Thirty freshly extracted human maxillary third molars were selected and randomly ascribed to three groups (n=10). Standardized Class II MOD preparations were made (bucco-palatal width = 2/3 of the intercuspal width and 2/3 of the width at the tooth equator for the proximal boxes), varying the extension of the preparations (Group 2: preparation limited to tooth structure; Group 3: pulpal floor of the preparation rebuilt with composite resin, IPS Empress Direct, restored with lithium dissilicate CAD/CAM ceramic inlays (e.max CAD) and cemented with a resin cement (Variolink II)). All groups were subjected to compressive strength test (1mm/min crosshead speed). The results showed that the fracture strength of G1 (control group) was significantly higher than G2 and G3, while within these groups there were no statistically significant differences. Both groups restored with lithium dissilicate restorations did not reach the fracture strength of the sound teeth but were statistically equivalent and sufficient to withstand physiologic masticatory forces.
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Biomechanical Properties of First Maxillary Molars with Different Endodontic Cavities: A Finite Element Analysis. J Endod 2018; 44:1283-1288. [DOI: 10.1016/j.joen.2018.04.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 03/28/2018] [Accepted: 04/08/2018] [Indexed: 11/18/2022]
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Lakshmi R, Abraham A, Sekar V, Hariharan A. Influence of connector dimensions on the stress distribution of monolithic zirconia and lithium-di-silicate inlay retained fixed dental prostheses – A 3D finite element analysis. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tdj.2015.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Wang XD, Jian YT, Guess PC, Swain MV, Zhang XP, Zhao K. Effect of core ceramic grinding on fracture behaviour of bilayered lithium disilicate glass–ceramic under two loading schemes. J Dent 2014; 42:1436-45. [DOI: 10.1016/j.jdent.2014.03.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 03/25/2014] [Accepted: 03/26/2014] [Indexed: 11/26/2022] Open
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Shibata S, Gondo R, Araújo É, Mello Roesler CRD, Baratieri LN. Influence of surrounding wall thickness on the fatigue resistance of molars restored with ceramic inlay. Braz Oral Res 2014; 28:S1806-83242014000100229. [PMID: 24918366 DOI: 10.1590/1807-3107bor-2014.vol28.0011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 02/19/2014] [Indexed: 11/22/2022] Open
Abstract
The purpose of this study was to evaluate the influence of buccal and lingual wall thickness on the fatigue resistance of molars restored with CAD/CAM ceramic inlays. Forty human third molars were selected and divided into 4 groups, according to the remaining surrounding wall thickness chosen for inlay preparation (n=10): G1, 2.0 mm; G2, 1.5 mm; G3, 1.0 mm; G4, 0.5 mm. All inlays were made from feldspathic ceramic blocks by a CAD/CAM system, and cemented adhesively. After 1 week stored in distilled water at 37 °C, the specimens were subjected to fatigue testing under the following protocol: 5Hz; pre-load of 200 N for 5,000 cycles, followed by increasing loads of 400, 600, 800, 1000, 1200 and 1400 N for 30,000 cycles each. The specimens were cycled until failure or completion of 185,000 cycles. The survival rate of the groups was compared using the Kaplan-Meier survival curves (p>0.05). All specimens withstood the fatigue protocol (185,000 cycles), representing a 100% survival rate. The Kaplan-Meier survival curves showed no difference between groups. It can be concluded that the remaining tooth wall thickness did not influence the fatigue resistance of molars restored with CAD/CAM ceramic inlays.
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Affiliation(s)
- Shizuma Shibata
- Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Renata Gondo
- Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Élito Araújo
- Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Carlos Rodrigo de Mello Roesler
- Deparment of Mechanical Engineering, Biomechanics Engineering Laboratory, University Hospital, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Luiz Narciso Baratieri
- Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil
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