Abd Elmenam Gnneip < /em>1, Hassan Elmotiam2, Ashraf Gebreel3, Abeer Alfallal4
1. Department of Removable Prosthodontics Faculty of Dentistry Tripoli University
2Professor of Removable Prosthodontics Faculty of Dentistry Mansoura University,Mansoura, Egypt.
3Assist. Prof. of Removable Prosthodontics Faculty of Dentistry Mansoura University Mansoura, Egypt.
4Professor of Biomaterial Faculty of Dentistry Mansoura University, Mansoura, Egypt.
Abstract:
Objectives:The aim of this work was to evaluate the bond strength between Versacrylic soft lining material (either self-cured or heat-cured) and heat cured acrylic resin.
Methods:For this study eighty acrylic resin specimens were prepared from a heat-cure acrylic resin. As American Society for Testing and Materials (ASTM), Forty cylindrical specimens of them prepared for tensile test (31 mm long and 16 mm in diameter) twenty specimens where joined to anther twenty specimens by 3 mm thickness of Versacrylic soft lining material. another forty block specimens for shear test (46 mm X 13 mm X 3 mm) were prepared twenty specimens where joined to another twenty specimens by 3 mm thickness of Versacrylic soft lining material. The prepared specimens were grouped as follows Group (I): consists to twenty testing specimens to evaluate the bond strength of self-cure Versacryl soft lining materials, then they were divided into: Sub-group (A): Ten block specimens were prepared for shear bond strength test. Sub-group (B): Ten cylindrical specimens for tensile bond strength test. Group (II): consist to twenty testing specimens to evaluate the bond strength of heat-cure Versacryl soft lining material, and then they were divided into Sub-Group (A): Ten block specimens were prepared for shear bond strength test. Sub-group (B): Ten cylindrical specimens for tensile bond strength test.
Results:The highest mean Tensile bond strength value was obtained for Versacryl soft lining material self-cure (2.29±0.523) heat-cure(3.85±0.66 ) Shear bond strength value was obtained for Versacryl soft lining material self-cure(1.167±.399) heat-cure(1.22±0.45) Tensile bond strength was significant higher than shear bond strength in both groups, There was no significant difference in shear bond strength between both group There was no significant correlation between tensile bond strength and shear bond strength for each group.
Conclusions:The use versacrylic resin material to reline the acrylic resin denture base, appear in this study to be satisfactory. As the bond strength of this material (shear and tensile) was suitable to be used clinically.