EVALUATION OF THE COMPRESSIVE STRENGTH OF HYBRID AND NANOCOMPOSITES-ORIGINAL RESEARCH
Esthetic correction represents one of the clinical conditions that require the use of composite veneers in the anterior region. Aim of the study is to evaluate the fracture strength of direct veneers in maxillary central incisors fabricated from composites (Direct Technique).Thirty sound human maxillary central incisors were used in this in vitro study. Teeth were randomly divided into three experimental groups of ten teeth each. Group A-Restored with Nano Hybrid (Ceram Spheretec), Group B-Restored with Microhybrid (Tetric n ceram) & Group C-Restored with Direct Composite Veneer(Spectrum).Standard preparations were done using ceramic veneer set and all specimens were stored in distilled water at 37 degree C for 2 weeks. After that the specimens were mounted in a acrylic block. The load was applied on the incisal part of the veneer to the long axis of the tooth using Universal Testing Machine .Results were analyzed with One Way Anova & LSD Tests. Group a showed higher mean of fracture strength with stastically significant difference in comparison to group B and group C. All Veneers used in this study can be considered as acceptable for treatment in the anterior region. Direct Composite veneer is the most favourable technique in terms of fracture strength.
Keywords; Composite veneers, Direct Veneers, Fracture strength, Microhybrid composite, Nanocomposite.