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http://dx.doi.org/10.4047/jap.2014.6.4.278

In vitro evaluation of the fracture resistance and microleakage of porcelain laminate veneers bonded to teeth with composite fillings after cyclic loading  

Sadighpour, Leyla (Dental Research Center, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences)
Geramipanah, Farideh (Dental Implant Research Center, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences)
Allahyari, Somayeh (Dental Research Center, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences)
Sichani, Babak Fallahi (Research Institute for Nuclear Medicine, Shariati Hospital, Tehran university of Medical Sciences)
Fard, Mohamd Javad Kharazi (Department of Epidemiology, School of Public Health, Tehran University of Medical Sciences)
Publication Information
The Journal of Advanced Prosthodontics / v.6, no.4, 2014 , pp. 278-284 More about this Journal
Abstract
PURPOSE. There is insufficient data regarding the durability of porcelain laminate veneers bonded to existing composite fillings. The aim of the present study was to evaluate the fracture resistance and microleakage of porcelain laminate veneers bonded to teeth with existing composite fillings. MATERIALS AND METHODS. Thirty maxillary central incisors were divided into three groups (for each group, n=10): intact teeth (NP), teeth with class III composite fillings (C3) and teeth with class IV cavities (C4). Porcelain laminate veneers were made using IPS-Empress ceramic and bonded with Panavia F2 resin cement. The microleakage of all of the specimens was tested before and after cyclic loading ($1{\times}10^6$ cycles, 1.2 Hz). The fracture resistance values (N) were measured using a universal testing machine, and the mode of failure was also examined. The statistical analyses were performed using one-way ANOVA and Tukey post hoc tests (${\alpha}=.05$). RESULTS. There was a significant difference in the mean microleakage of group C4 compared with group NT (P=.013). There was no significant difference in the fracture loads among the groups. CONCLUSION. The microleakage and failure loads of porcelain laminate veneers bonded to intact teeth and teeth with standard class III composite fillings were not significantly different.
Keywords
Porcelain laminate veneer; Fracture resistance; Microleakage;
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