The Japanese Journal of Pediatric Dentistry
Online ISSN : 2186-5078
Print ISSN : 0583-1199
ISSN-L : 0583-1199
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-
Yasuhiro Masumoto, Takanobu Morinushi, Tadashi Ogura, Megumi Nagata, Youichi Yamasaki, Kiyohito Minematu, Takako Fujise, Haruaki Hayasaki, Minoru Nakata, Sumio Kumasaka, Noboro Uchimura, Masanao Doi, Morito Akasaka, Hiroyuki Karibe, Kiyokazu Ogata, Susumu Kikuchi, Midori Nakashima, Hiroo Miyazawa
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Keywords: First Permanent Molar, Occlusal Contact Area, Occlusal Force, Bilateral Balance
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1999 Volume 37 Issue 3 Pages 475-481

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Abstract
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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© The Japanese Society of Pediatric Dentistry
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