Abstract
The normal and alloxan diabetic rats received either excessive amalgam filling in the maxillary first molar or elimination of the crowns of the mandibular second and third molars. After the treatments, these animals were fed on the powder diet (a normal laboratory diet) or the powder diet containing their feces. The animals were killed at intervals of 1, 3, 5, 7, 10, 14, 17 and 21 days. The histologically observations were performed on the periodontal tissues in the root bifurcation area of the mandibular first molar.
The results were as follows;
1. Excessive amalgam filling group
1) In both normal and alloxan diabetic rats on the powder diet, the resorption of the cementum and alveolar bone and the necrosis of the periodontal ligament were observed at 7 days. These injuries in normal and alloxan diabetic rats were repaired at 14 days and 21 days, respectively, but the osteopotic change was seened in alloxan diadetic rats at 21 days.
2) In normal rats on the powder diet with feces (C group), histological observations were similar to those seen in A group.
3) In alloxan diabetic rats on the powder diet with feces (c group), the resorption of the alveolar bone and the necrosis of the periodontal ligament were found at 7 days. These changes become severer by the inflammation after 7 days, and the injury was not repaired even at 21 days.
2. Elimination of the crowns group
1) In normal and alloxan diabetic rats on the powder diet, (B and b groups, respectively), the changes were less severe than those seen in A group.
2) In normal and alloxan diabetic rats on the powder diet with feces (D and d groups, respectively), the changes were less severe than those seen in A group.
