Histological and Radiographic Changes after Surgical Correction of Permanent Canines in Dogs

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  • 犬における永久犬歯の外科的矯正後のX線学的および組織学的変化
  • イヌ ニ オケル エイキュウ ケンシ ノ ゲカテキ キョウセイゴ ノ Xセンガ

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Abstract

Histological and radiographic changes in the root and periodontal tissue after surgical correction of displaced permanent canines caused by retention of deciduous canines were studied. The dogs were divided into 2 groups according to the surgical force used to create tooth movement. In group I, a surgical orthodontic force of several hundred grams (within 1kg) was applied to the teeth, whereas in group II, several kilograms (2-4kg) force was enployed. Comparisons of both groups with control (untreated) teeth were then made radiographically and histologically. There were no evident radiographic changes in group I compared with the control group, but enlargement of the pulpal space, abnormal dentinogenesis and malformation of the root were seen in group II. Mild histological changes such as secondary cementum formation and slight widening of the alveolar space were seenin group I. However, in group II, disturbance of root formation or deformation of the root was observed along with severe pathological changes including resorption of dentine, interruption of root dentinogenesis, reticular degeneration of pulpal tissue, and formation of bone-like tissue in the pulp.

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