الفهرس | Only 14 pages are availabe for public view |
Abstract This in-vitro study studied the marginal integrity of three types of Bulk Fill Composite resins in Class II cavities. Forty extracted human sound molars were selected. The teeth were fixed with sticky wax to the base of plastic cylinder. The cylinder was filled with self-curing acrylic resin so that only root was embedded within the selfcuring acrylic resin. Simple Class II cavities with parallel walls were prepared. The cavities were prepared using coarse diamond stone with water spray and finished with fine- grained burs. The cervical margin was established 1.5 mm above the cement - enamel junction. The overall dimensions and depth of the cavities were standardized as follow: 4 mm length occluso cervically and 4 mm width bucco lingually and 2 mm depth axially. The teeth were randomly divided into four groups (n=10 each). group 1: Tetric N bond Universal and Tetric Evo Ceram Bulk Fill composite. group 2: Single Bond Universal and Filtek Bulk Fill posterior composite. group 3: Futura bond U and Admira Fusion X-Tra. group 4: Tetric N bond Universal and Tetric Evo Ceram composite. All samples were thermo cycled for 600 cycles from 5oc to 50oc. Impressions of the teeth were made using a polyvinyl siloxane material (light body). The impressions were then poured with epoxy resin. These replicas were left 24 h for complete setting. Then, Gold sputtered and examined under SEM with different magnifications (x50, x2000) magnification. The marginal gap was measured for all the samples using Auto CAD software. |