Fracture Strength of Veneer Contact Lens

Abstract

The no prep technique to ceramic veneer have some advantages, one of the most important is the preservation of tooth structure. Purpose: Evaluate fracture resistance in bovine teeth, of ceramic veneer in different thickness (0,3 to 1,0mm). Methods: 60 teeth were selected for this study. Forty fifth ceramic veneer were made for each tooth, variating the thickness in: G1 -0,7mm; G2 -0,5mm; G3 -0,3mm and G4 -1,0mm (control group).Flexural strength test was carried out after 24h of luting. The results were analysed by ANOVA and HSD of Tukey. Results: the results showed that was no statistic difference between the groups (G1-297.2200; G2 -294.5467; G3 -291.9380 and G4 -290.0733). Conclusion: The ceramic veneer thickness didn't have influence in the final flexural strength.

Thickness and yttria percentage influences the fracture resistance of laminate veneer zirconia restorations

“…While other studies found that reducing thickness exhibited superior fracture strength or no significant difference and it was proposed that the monoclinic phase/tetragonal phase distribution in the Y‐TZP could have influenced the outcome or they explained that by the difference in the methodology or one possible explanation for thinner Y‐TZP ceramics, resulting in higher strength could be the phase transformation t‐m created on the surface because of the machining process and a proportionally thicker monoclinic layer may be created on thinner specimens than on thicker specimens so Since the monoclinic layer has; 3%–4% volume expansion compared to the tetragonal phase, the compressive layer formed at the surface by this layer could have resulted in stronger thinner specimens (Akesson et al, 2009 ; Baptista da Silva et al, 2020 ; Sundh & Sjögren, 2004 ).…”

“…T A B L E 1 Descriptive statistics for different types of ceramics materials and their effect on fracture resistance. tetragonal phase, the compressive layer formed at the surface by this layer could have resulted in stronger thinner (Akesson et al, 2009;Baptista da Silva et al, 2020;Sundh & Sjögren, 2004).…”