鋳造冠の辺縁形態が歯肉に及ぼす影響
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概要
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For the purpose of investigating the effect of marginal morphology of crown prostheses on the periodontal tissue, four types of cast crowns, with the finishing line at 0.5mm below the gingival crest, were made and a setting experiment was conducted in the premolar of the dog. The following crowns were used ; Group I : The fit of crown margin was confirmed at wax pattern taking and polishing, under the stereoscopic microscope ; Group II : The margin of the crown for Group I was grounded slightly with silicon points to make it smooth and round ; Group III : The fit of the margin was confirmed macroscopically ; Group IV : Marked overhang was provided at the margin. Observations were made for 1, 3, and 12 months and histopathological changes, due to difference in fit of the margin, in the periodontium were examined. Furthermore, microstructural changes in the epithelial layer of the gingival sulcus and at the cervical margin were observed under the scanning electron microscopy. The results were as follows : 1. In Groups I and II, no changes in the tissue structure in three months were as in controls. In 12-month cases, inflammatory cells were found in the lamina propria under the epithelial layer of the gingival sulcus. However, no difference was found between the two group. 2. In Groups III and IV, changes in the tissue structure were seen since early stages and inflammation extended with time. Greater inflammatory changes were found in Group IV than in Group III. 3. The thickness of the cementum layer at the margin averaged 58.3μm in Group I, 52.8μm in Group II, 113.3μm in Group III, and 125.6μm in Group IV. 4. The surface of the epithelial layer of the gingival sulcus in Groups I and II was relatively flat and cell borders were relatively clear. The portion corresponding to the crown margin was protruded in Group III and depressed in Group IV. In both groups cell borders were unclear and cellular space was expanded. 5. The margins were sharp like a knife-edge in Group I and round and smooth in Group II. Neither group showed deposits such as plaque on the margin. In Groups III and IV, the margins were irregular, and grinding scratches were found. Deposits increased with time. 6. Deposits were found on the surface of cementum in every group and increased markedly with time in Groups III and IV.
- 九州歯科学会の論文
- 1988-12-25
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