Effect of Different Joint Designs on Transverse Strength on Repair of Heat Cured Acrylic Resin

Taisir K. Ismael, Qusay Abd. Hasan and Zainab T. Kareem

Abstract

Denture fracture is a crucial issue with dental prosthetics. Using mechanical and chemical modifications in the joint area can cause increasing in the binding strength of fractured denture base surfaces, and it must be as original strength as much as possible.  So the aim of this study was to identify the effect of different repair design on the transverse strength of acrylic resin material. Out of 40 specimens of heat cured acrylic resin with dimension (65 mmmm×10 mmmm×2.5 mm) (length, width, and thickness respectively), 8 of them were kept intact and considered as a control group. 32 samples were cut at the middle to create a gap (3 mm) and prepared with different joint designs as butt, round, grooves for wire embedding ( 0.7 mm), and beveled (each of them have 8 samples). Transverse strength was tested. Result of transverse strength test showed that the highest mean value recorded by wire embedding group which equal to (91715), while the lowest mean value represented by round group which equals to (55.605). Modifications that created to the repair area have a significant effect on transverse strength of repaired specimens.