Abstract
This study was attempted in order to investigate the visible light-cured composite resin Fotofil(Johnson & Johnson)penetration into the etched normal primary dentin through a scanning electron microscope. Extracted or exfoliated teeth(noncarious: 17 cases)were used. Class V cavities were prepared dry with the diamond bars. The dentin was etched for 1minute, then rinsed with water for 30 seconds and dried by compressed air for 30 seconds. The resin was filled in the cavities and polymerized by visible light (Activator Light) for 60 seconds.
The following observations were obtained.
1. Only in one case out of 17 cases using Fotofil was the resin penetration into the primary dentin observed. Also the length of the resin tags into the dentin were extremely short being several microns.
2. It was found that there was no adhesion by micromechanical interlocking between Fotofil and the primary dentin.
