الفهرس Only 14 pages are availabe for public view
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Abstract
the present study was performed on 60 recently extracted sound human premolars ,the teeth were collected and cleaned from any calculus deposits and soft tissues debris by ultrasonic sclaer ,the buccal and lingual surface of all teeth were microscopically examined at X20magnification to assure the absence of craks or defects the selected teeth were free of caries restoration and showed no evidence of white spots ,before cavity preparation ,a stander shaped cylindrical class V cavity was made in the buccal and lingual surface of each tooth According to the present study it can be concluded that :
1. Gingival margins exhibited significantly more microleakage than occlusal margins in both types of composites in all testing periods
2. flowable composite showed better 2 month initial adaptationat gingival margins than packable composite
3. water storage produced a slow progressive deterioration of adaptation after 4 month and become more significant at 6 months intervals
4. flowable composite exhibited more deterioration of adaptation than packable composite at both 4 and 6 month periods of water immersion
5. surface sealant improved adaptation of both flowy and packable composite of the 2 and 4 month aged groups however the test specimens a Gradual increase of leakage that become markedly significantly 6 month intervals