咬合接触が隣接歯に及ぼす影響

The effect of occlusal contacts on adjacent tooth.

抄録

目的:

本研究の目的は、咬合接触の変化が咬合時の隣接歯の変位に及ぼす影響を明らかにすることである。

PURPOSE: The purpose of this study was to clarify the influence of changes of occlusal contacts on adjacent tooth displacement during articulation.

材料および方法:

上顎左側第一大臼歯および隣接歯の変位量および変位方向を変位計M-3型を用いて測定した。本研究には7名の被験者が参加した。上顎左側第一大臼歯に白金箔を用いて8点の実験用咬合接触点を設定し、それぞれ頬側咬頭と舌側咬頭に対応する頬側群と舌側群の2群に分けた。

MATERIALS AND METHODS: The amount and direction of displacement of the maxillary left first molar and adjacent teeth were measured using a displacement transducer, Type M-3. Seven subjects were included in this study. On the maxillary left first molar, 8 experimental occlusal contact points were established using platinum foil and these were divided into 2 groups, the buccal and lingual groups, which corresponded to the buccal and lingual cusps, respectively.

結果:

食いしばり時、頬側群では3歯（第二小臼歯、第一大臼歯、第二大臼歯）の変位経路の方向に差が認められたが、舌側群では差はなく、3歯の変位方向は天然歯と同様であった。

RESULTS: During clenching, the buccal group showed differences in the direction of the tooth displacement paths among the 3 teeth (second premolar, first and second molar), but there was no difference in the lingual group and the direction of displacement of these 3 teeth was similar to the natural teeth.

結論:

支台歯だけでなく隣接歯の変位を得るためには，少なくとも1点の舌側咬合接触点を形成する必要がある．

CONCLUSION: It is necessary to make at least one lingual occlusal contact point to obtain displacement of not only the abutment tooth but also the adjacent teeth.