A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations

摘要: Abstract Objective: The aim of this study was to evaluate whether the method light curing could influence: (a) marginal sealing and resin composite adaptation cavity wall; (b) polymerization contraction rate; (c) hardness at top bottom surfaces a body composite. Methods: Standard cylindrical cavities, 1 mm deep 3 mm in diameter were prepared on flat superficial dentin bovine teeth. teeth bonded with one two adhesive systems (Clearfil Photo Bond, Super-Bond D Liner) filled hybrid resins cured using three intensities 600, 270 20 mW/cm2, various times. After thermal cycling, specimens subjected dye penetration test walls. In addition, same conditions, rate measured. difference over time measured Knoop measurements taken made Teflon mold dimensions as dentin. Results:When an initial intensity 270 mW/cm2 for 10 s, 5 s interval then 600 mW/cm2 50 s, best wall observed compared other modes. Earlier hardening occurred base surface composite, most completed during flowable stage All methods demonstrated results some degree opening gap formation, worst being 600 mW/s 60 s. Significance: use low (270 mW/cm2) 10 s followed by high (600 mW/cm2) 50 s provides walls possibly least stress.