Fracture resistance and marginal discrepancy of porcelain laminate veneers influenced by preparation design and restorative material in vitro

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• 作者：Tai-Min Lin^a ; Perng-Ru Liu^b ; Lance C. Ramp^c ; Milton E. Essig^c ; Daniel A. Givan^b ; Yu-Hwa Pan^d ; ^{alan8302018@gmail.com}
• 关键词：Traditional veneer ; Full veneer ; Fracture resistance ; Marginal discrepancy ; Sintered feldspathic porcelain ; CAD/CAM ; Resin tooth replica ; Cross-sectional view ; Ratio of elastic modulus
• 刊名：Journal of Dentistry
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：40
• 期：3
• 页码：202-209
• 全文大小：736 K

文摘

Objectives

The purpose of this investigation is to evaluate marginal discrepancy and fracture resistance of two veneering materials using two preparation designs.

Methods

Two veneer preparation designs (full and traditional) were restored with leucite-reinforced ceramic (ProCAD, Ivoclar Vivadent, Amherst, NY) milled by CAD/CAM (Cerec 3D milling system, Serona Dental Systems), and conventional sintered feldspathic porcelain (Noritake Super Porcelain EX3, Noritake Dental Supply Co). Forty-eight specimens were analysed with a sample size of n = 12 per group. The thickness of each veneer was measured on four specific surfaces. Marginal discrepancy was evaluated with a replica technique and cross-sectional view using a digital microscope. The fracture resistance of veneers cemented on standardised composite resin dies was evaluated using a universal testing machine. Results were analysed with ANOVA, Tukey-Kramer post hoc testing, and linear regression.

Results

The results of this investigation revealed no correlation between the thickness and marginal discrepancy of the veneers. The full preparation design with ProCAD and the traditional preparation design with feldspathic porcelain manifested smaller gap. Fracture resistance was decreased for the full preparation design with feldspathic porcelain.

Conclusions

In terms of marginal discrepancy and fracture resistance, the most favourable combination was a traditional veneer preparation design with conventional sintered feldspathic porcelain. For the full veneer preparation, a stronger ceramic material such as ProCAD is suggested.