Archive \ Volume.8 2017 Issue 4

A Comparative Analysis of Shear Bond Strength of Composite and Acrylic Teeth to Heat-Cured Acrylic Resin by Difference Preparation Methods

Mojtaba Ramezani , Pezhman moradi
Abstract

Objectives: One of the basic problems in patients using removable denture is detachment of artificial teeth from the denture acrylic base. The bond strength of artificial teeth to acrylic base may affect this problem.    

Materials & Methods: In this experimental study, five groups of artificial teeth (n=150), including 30 phoenix artificial teeth, 30 Emeral artificial teeth, 30 crystal artificial teeth, 30 ECL artificial teeth (Beta Dent Co, Iran), and 30 Ivoclar artificial teeth( Ivoclar Vivadent) were prepared by three different methods: 50 without surface preparation, 50 by methylmethacrylate monomer, and 50 by cavity preparation. Then, wax investment was performed, replacing the heat-cured acrylic resin. To determine the shear bond strength by Universal Testing Machine (UTM), a shear force with a speed of 1mm/min was delivered to samples and the force causing the fracture was recorded. The location and type of fracture were then investigated. The obtained data were analyzed by Kruskal-Wallis test.  

Results: The results showed a significant difference in shear bond strength between different artificial teeth in anterior teeth prepared by MM (p=0.004) and CV (p=0.048). Moreover, the findings indicated no significant difference in shear bond strength between different artificial teeth in posterior teeth prepared by MM (p=0.256) and CV (p=0.232).

Conclusion: The findings showed a significant difference between the shear bond strength of acrylic and composite denture artificial teeth to heat-cured acrylic resin