第一大臼歯の萌出,咬合推移と咬合接触面積および咬合力の変化-第2報経年的採取資料の分析結果について-

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  • A Study of the Effect of the Eruption and Transition of the First Permanent Molar on the Occlusion, Occlusal Contact Area and Occlusal Force -2 The Longitudinal Data Analyses-

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This study is a part of the study on the development of the occlusal function in children that was carried out by the department of pediatric dentistries of six colleges to examine the longitudinal change regarding the occlusal contact for a period of 2 years starting from around the time of the eruption of the first permanent molar. We examined longitudinally the occlusal contact area, the mean pressure, the occlusal power and the maximum power for the first permanent molar and second deciduous molar in 18 cases using data obtained four times every six month from around the time of the eruption of the first permanent molar. There was consequently a positive correlation between the contact area and each other parameter. The occlusion of the first permanent molar demonstrated maturating with fluctuations in each of the four types of contact area during the examination's period. It was in the end suggested that the first permanent molar in every type could be obtained finally a stable situation bilaterally with cooperation of the deciduous second molar. One of the types however did not obtain bilateral harmony of the contact area in cooperation with the deciduous second molar with the final data. It was indicated that this case should be further considered to obtain a conclusion. If further follow-up survey for this research can be succeeded, it will provide a more definite conclusion.

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