Abstract
In the field of conservative dentistry these days, clinical use of composite resin is becoming wide spread, however we can't but use the acid treatment and the application of the bonding agent together because we can't get complete adhesion between the composite resin and the dentin surface. Now, we have examined the dentin permeability, marginal leakage, and measured the contact angle of it after irradiation of YAG and CO2 laser with comparative low energy density. It proved that the dentinal tubules on lased surface are blocked owing to the inhibition of the dye penetration, the marginal sealing between the composite resin and the lased dentin surface is improved, and the contact angle is decreased remarkably by YAG laser irradiation (Energy density is from 6 to 25 J/cm2).
