The effect upon the periodontium of dogs of tooth reduction and crown margin placement

Abstract

The purpose of this experiment was to investigate the effects of: Crown margin placement; temporary crown utilization; and restorative manipulation on the tissues. The three dogs were used each one having six premolars crowned. Two molars were prepared and crowned for each of the three levels of margin placement studied. The three dogs were sacrificed in succession, the first two days past-insertion, the second two weeks past-insertion and the last two months past-insertion. The results indicate that margins terminating at the free gingival margin do produce an inflammatory reaction directly or indirectly in the adjacent tissue. The use of temporary acrylic crowns does not cause overt inflammatory reactions in the adjacent gingiva. The results also show that damage to crevicular epithelium due to prosthetic pocedures is reversible as healing occurs.