Abstract
This histopathological study was undertaken to compare the pulpal response to one composite resin for posterior teeth from A company with that of another from B company, using the primary teeth of young dogs.
The results were as follows:
1. There was no significant difference between the two compostie resins. In the 3-day postoperative period, an initial inflammatory reaction elicited from cavity preparation was observed, but this response disappeared with time, and in the 21-day postoperative period, reparative dentin formation was displayed in all teeth.
2. No significant difference between the pulpal responses of the 2 products was shown if the remaining dentin thickness was greater than 100μ. However, if it was less than 100μ, it appeared that pulpal irritation of the composite resin from A company was slightly less.
