Resin-matrix ceramics for occlusal veneers: Effect of thickness on reliability and stress distribution
| Autor: | Edmara T.P. Bergamo, Estevam A. Bonfante, Altair Antoninha Del Bel Cury, Mirelle Maria Ruggiero, Rafael Soares Gomes, Mariana Itaborai Moreira Freitas |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Dental Stress Analysis
Ceramics Materials science medicine.medical_treatment 02 engineering and technology Nanoceramic Mandibular first molar Stress (mechanics) 03 medical and health sciences 0302 clinical medicine Materials Testing Shear stress medicine General Materials Science Ceramic Composite material General Dentistry Reliability (statistics) Weibull distribution Reproducibility of Results 030206 dentistry 021001 nanoscience & nanotechnology Dental Porcelain Resin Cements Dental Veneers Mechanics of Materials visual_art visual_art.visual_art_medium Computer-Aided Design Veneer 0210 nano-technology |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 37(3) |
| ISSN: | 1879-0097 |
| Popis: | Objective To evaluate the influence of resin-matrix ceramic material and thickness on reliability and stress distribution of occlusal veneers (OV). Methods One hundred and twenty-six OV of a mandibular first molar were milled using a CAD/CAM system and allocated according to materials (resin nanoceramic (RNC) or polymer-infiltrated ceramic network (PICN)) and thicknesses (0.5, 1.0 and 1.5 mm), totaling six groups (RNC0.5, RNC1, RNC1.5, PICN0.5, PICN1, and PICN1.5). Step-stress accelerated-life testing was performed (n = 21/group) with the load applied at the distobuccal cusp tip of the occlusal veneer until failure or suspension. The use level probability Weibull curves and reliability were calculated and plotted (90% CI). Finite element analysis evaluated the stress distribution according to maximum principal stress (σmax) on the restoration and maximum shear stress (τmax) on the cement layer. Results There was no difference in the probability of survival for the estimated missions among the groups, except at 600 N in which the results were significantly lower to PICN1.5 (6%) compared to RNC1 (55%) and RNC1.5 (60%). The σmax values were higher for PICN (31.85–48.63 MPa) than RNC (30.78–33.09 MPa) in the same thicknesses. In addition, 0.5 mm groups concentrated more stress in the restoration (33.09–48.63 MPa) than 1.0 mm (31.11–35.36 MPa) and 1.5 mm (30.78–31.85 MPa) groups in the same material. Significance Both resin-matrix ceramic materials seem up-and-coming restorative systems for occlusal veneers irrespective of the thicknesses as a consequence of the high reliability. |
| Databáze: | OpenAIRE |
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