Effect of light-tip distance on polymerization of resin composite.

摘要: The inability to place a light tip in close approximation resin restoration may affect the resultant polymerization and clinical durability of restoration. This research measured intensity at surface composite, as well 2 mm within its bulk, tip-to-resin distance is moved from 0 10 mm. composite both locations was for various distances using exposure durations 10, 20, 40, 60 seconds. Light did not decrease with inverse square distance. on greatly dependent upon duration exposure. extent below still primarily duration, but had significant affect. For 40 seconds, greater than 4 demonstrated surface.