Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

In this study, marginal and internal misfit and fracture load with and without thermal-mechanical aging (TMA) of monolithic ZLS and lithium disilicate (LDS) crowns were evaluated. Crowns were milled using a computer-aided design/computer-aided manufacturing system. Marginal gaps (MGs), absolute marg...

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Bibliographic Details
Published in:Journal of applied oral science 2017-05, Vol.25 (3), p.282-289
Main Authors: Gomes, Rafael Soares, Souza, Caroline Mathias Carvalho de, Bergamo, Edmara Tatiely Pedroso, Bordin, Dimorvan, Del Bel Cury, Altair Antoninha
Format: Article
Language:English
Subjects:
Analysis of Variance
Compressive Strength
Computer-Aided Design
Crowns
Dental Marginal Adaptation
Dental materials
Dental prosthesis
Dental Prosthesis Design
Dental Prosthesis, Implant-Supported - methods
Dental Restoration Failure
DENTISTRY, ORAL SURGERY & MEDICINE
Materials Testing
Organometallic Compounds - chemistry
Original
Reference Values
Reproducibility of Results
Statistics, Nonparametric
Succinates - chemistry
Surface Properties
Time Factors
Tooth Fractures
X-Ray Microtomography
Zirconium - chemistry
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Summary:In this study, marginal and internal misfit and fracture load with and without thermal-mechanical aging (TMA) of monolithic ZLS and lithium disilicate (LDS) crowns were evaluated. Crowns were milled using a computer-aided design/computer-aided manufacturing system. Marginal gaps (MGs), absolute marginal discrepancy (AMD), axial gaps, and occlusal gaps were measured by X-ray microtomography (n=8). For fracture load testing, crowns were cemented in a universal abutment, and divided into four groups: ZLS without TMA, ZLS with TMA, LDS without TMA, and LDS with TMA (n=10). TMA groups were subjected to 10,000 thermal cycles (5-55°C) and 1,000,000 mechanical cycles (200 N, 3.8 Hz). All groups were subjected to compressive strength testing in a universal testing machine at a crosshead speed of 1 mm/min until failure. Student's t-test was used to examine misfit, two-way analysis of variance was used to analyze fracture load, and Pearson's correlation coefficients for misfit and fracture load were calculated (α=0.05). The materials were analyzed according to Weibull distribution, with 95% confidence intervals. Average MG (p
ISSN:1678-7757
1678-7765
1678-7765
1678-7757
DOI:10.1590/1678-7757-2016-0233