Abstract
Purpose Porcelain laminate veneers (PLVs) are sometimes required to be used for teeth with composite fillings. This study examined the fracture strength of PLVs bonded to the teeth restored with different sizes of class V composite fillings. Materials and Methods Thirty-six maxillary central incisors were divided into three groups (n=12): intact teeth (control) and teeth with class V composite fillings of one-third or two-thirds of the crown height (small or large group, resp.). PLVs were made by using IPS e.max and bonded with a resin cement (RelyX Unicem). Fracture resistance (N) was measured after cyclic loading (1 × 106 cycles, 1.2 Hz). For statistical analyses, one-way ANOVA and Tukey test were used (α=0.05). Results There was a significant difference between the mean failure loads of the test groups (P=0.004), with the Tukey-HSD test showing lower failure loads in the large-composite group compared to the control (P=0.02) or small group (P=0.05). The control and small-composite groups achieved comparable results (P > 0.05). Conclusions Failure loads of PLVs bonded to intact teeth and to teeth with small class V composite fillings were not significantly different. However, extensive composite fillings could compromise the bonding of PLVs.
Highlights
Porcelain laminate veneers (PLVs) represent an excellent treatment option for restoring aesthetics while preserving the integrity of the remaining tooth structure
E failure mode was examined with a stereomicroscope (Zeiss OPM1, Carl Zeiss, Oberkochen, Germany) at a magnification of ×20. e failure mode was categorised as adhesive, cohesive, or mixed. e homogeneity of variances and normal distribution of data were verified by Levene’s test and the Kolmogorov–Smirnov test, respectively. en, the mean values of fracture resistance were statistically analysed by one-way ANOVA and TukeyHSD post hoc using SPSS (SPSS Inc., Chicago, IL, USA) at a significance level of 95% (α 0.05)
Discussion e mean fracture resistance of the PLV-restored teeth with class V composite fillings was examined after cyclic loading
Summary
Porcelain laminate veneers (PLVs) represent an excellent treatment option for restoring aesthetics while preserving the integrity of the remaining tooth structure. E amount of enamel may be compromised by several factors, such as fracture, wear, and preparation of various types of restorations, including composite fillings [8,9,10]. One study on the clinical performance of PLVs showed that 70% of patients had previous composite fillings [2]. Under such circumstances, some clinicians believe that the preparation margins should be extended to sound enamel, far to the interproximal or even to the lingual enamel, to create intraenamel margins [7, 8]. Higher failure rates were observed when laminate veneers were bonded to large-composite fillings [2, 3]. A reliable bonding could be achieved with greater quantities of enamel surface and margins
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