| Wedge-shaped defect is an abrasion that caused by long-term abrasion in tooth cervical. It often is wedge shape. It is well-known to be prevalent in oral. Filling is the best therapy way and being used commonly .But the effect of filling are often limited by materials. In this research, we compared five kinds of materials that were usually being used in clinical. In order to give a reference to clinical application, we evaluate the microleakage of restorations and the pictures under scanning electronic microscope(SEM) and bond strength in vitro and the clicinal assessment for the five kinds of restorations of wedge - shaped defect.PART ONE: EXPERIMENTAL RESEARCH 1 EVALUATION OF MARGINAL SEAL OF FILLING MATERIALSIN WEDGE-SHAPED RESTORATIONSObjective: To compare the marginal microleakage of five kinds of dental filling materials.Methods: 120 extracted teeth were randomly divided into 5 groups with 24 teeth in each group. Standard cavity V were prepared on buccal cervical surface at the CEJ level and filled with silver amalgm (group A), traditional glass ionomer cement (GIC group B), composite_resin (group C), 3M-vitremer (group D),Dyract(group E) respectively. 12 teeth in each group were immersed in 2% methylene blue solution, then each sample was longitudinally sectioned . These were examined under x20 magnification to assess the degree of microleakage. Another 12 teeth in each group were...
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