Composites kalyan/ dental implant courses by Indian dental academy

The light intensity at the resin surface is a critical factor in completeness of cure at the surface and within the material. The tip of the light source must be held within 1 mm of the surface to gain optimum penetration. More opaque shades reduce light transmission and cure only to minimal depths (1 mmm). A standard exposure time using most visible light is 20 seconds. In general, this is sufficient to cure a light shade of resin to a depth of 2 or 2.5 mm. A 40 second exposure improves the degree of cure at all depths, but it is required to obtain sufficient cure with the darker shades. Application of the light beam through 1 mm or less thickness of tooth structure produces a sufficient cure at shallower depths, but the hardness values obtained are not consistent. www.indiandentalacademy.com