Full course description
Recent adhesive resins provide excellent bonding. In the laboratory, the bond tests are very well established. Their bond procedures are controlled appropriately to follow the manufacturer’s instruction. However, in the clinical situation, there are many factors to prevent us to obtain the maximum performance of materials. Bonding in cavities, light intensity is reduced at the bottom of cavity, resulted in poor conversion of the bonding resin. The initial bonding is believed to be lower and the contraction stress of the filled composite resin easily de-bonded in that situation. The first placement of composite resin should be particularly important for bonding. Its thickness and also the light irradiation to the first layer of the composite increase the conversion of bonding resin. Recent flowable composite resin shows high mechanical properties comparable to the paste type of composite resins. The placement of flowable composite resin with sufficient light curing is to be recognized as a part of the bonding procedure. The indirect irradiation through the restoration is also very important for bonding of resin cement in indirect restorations. Another clinical issue is the bonding to caries affected dentin. The smear layer of caries affected dentin contains much more organic substance. The organic rich smear layer decreases the etching effect of self etching primer. To modify the organic-rich smear layer, the application of de-proteinizing solution is recommended. Selection of the de- proteinizing solution and application time are considered to be significant for obtaining good bonding.