乳歯列における歯間空隙と咬合状態との関連性

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  • Relationship between Interdental Spaces and Occlusion in Deciduous Dentition

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To elucidate the association children in between the interdental space and the occlusal status of the primary dentition, we divided 39 Hellman dental age stage II A (17 boys,22 girls, mean age: 4 years 7 months) with individual normal occlusion into an early primary dentition period group who were under 4 years 6 months of age and a late primary dentition period group who were 4 years 6 months of age and over, and then divided each of them into an interdental space group, which had an total upper interdental space of 3.0 mm or more and a total lower interdental space of 2.0 mm or more, and a closed group, which had a total upper interdental space less than 3.0 mm and a total lower interdental space less than 2.0 mm. We then analyzed the relationships between interdental space size and morphology of dentition, occlusal wear of the primary canines, occlusal force, and occlusal contact surface area, and obtained the following results:<BR>1. In the closed group, the upper interdental spaces in the early primary dentition period were larger than in the late primary dentition period, and in the interdental space group, were the reverse opposite.<BR>2. The crown mesiodistal width in both the upper and lower primary incisor area was greater in the closed group than in the interdental space group, but no difference between the groups was found in the primary molar area.<BR>3. The overbite and overjet were larger in the closed group than in the interdental space group.<BR>4. The occlusal wear of the primary canine teeth was less in the closed group than in the interdental space group.<BR>5. The total occlusal force and total occlusal contact area were smaller in the closed group than in the interdental space group.<BR>6. The occlusal force and occlusal contact area at primary canines and primary molar were higher in the interdental space group than in the closed group, but at the primary incisor were higher in the closed group, especialy in the early primary dentition period.<BR>7. In the interdental space group, the distribution of occlusal force and the distribution of occlusal contact area in the primary anterior tooth area were higher in the late primary dentition period than in the early primary dentition period, but in the primary molar area they were higher in the early primary dentition period than in the late primary dentition period.<BR>8. In the closed group, the distribution of occlusal force and distribution of occlusal contact surface in the primary anterior tooth area were higher in the early primary dentition period than in the late primary dentition period, but in the primary molar area they were higher in the late primary dentition period than in the early primary dentition period.

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