Craniofacial morphology of growing rats with repeated amputation of incisors and recovery after cessation of amputation

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The purpose of this study was to investigate the craniofacial morphological changes in the growing rat after repeated amputation of the upper right and lower right incisors. The subsequent deformities or changes from the amputations and the recovery after the cessation of amputations were also observed in the mature rats. Thirty-four male Sprague-Dawley rats were divided into four groups. Group A received amputation every other day until twelve weeks old. Group B received amputation from two to twelve weeks old and then were fed without amputation until twenty-two weeks old. Normal control groups C and D were fed from twelve to twenty-two weeks old. Animals were weighed and body lengths were measured for the experimental period once a week. The radiographs of craniums and mandibles obtained after these experiments were processed into computer with an image scanner. The computerized image was measured and the data obtained in this study were analyzed statistically using paired Student's-t test. The results were as follows : 1. Among all groups the body lengths showed no significant difference. At twelve weeks old, the body weight of experimental group was significantly lighter than that of the control group. However, no significant weight difference among the groups was found at twenty-two weeks old. 2. No significant difference was found between the left (control) and right (experimental) sides of the cranium. 3. At twelve weeks old, the increase in the curvature of the right incisors, thinning of the upper incisal alveolar bone and thickening of the lower alveolar bone occurred in the mandible. At twelve weeks old, the supero-posterior growth of the right condylar heads showed a significant increase as compared to the left side. In the ramus, the right side was significantly longer than that of the left at the age of twelve weeks old. 4. In the group that was fed up to twenty-two weeks old, no significant differences between the left and right sides of the condylar regions were found. In the ramus and alveolar bone regions, significant differences remained, although the extent of change was reduced after the normalization of occlusion. The morphological alternations caused by incisor amputation during the growth stage may remain in some mandibular regions even when re-eruption occurred and normal occlusion was restored throughout the mature stage.
日本矯正歯科学会の論文

Craniofacial morphology of growing rats with repeated amputation of incisors and recovery after cessation of amputation

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