上下無歯顎臼歯部の歯槽堤と筋圧中立帯との頬舌的位置関係について
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概要
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In use of complete dentures for the upper and lower jaws, positioning of artificial teeth in the molar region is one of the factors which affect the retention and stability of the dentures. For the purpose of determining the standards for posterior teeth arrangement in the complete dentures, the bucco-lingual positional relation between the neutral zone and alveolar ridge of the upper and lower jaws of edentulous patients was measured on the occulusal plane. The results were as follows : 1. The bucco-lingual width of the neutral zone was about 8.5mm at the molar region. It got narrower at the second molar and was narrower than that of the artificial second molar in about 13% of the cases. 2. The median point of the neutral zone was positioned 2.5mm to the buccal side, on the average for the molar region, from the interalveolar crest line. 3. In the cases where the crest of the alveolar ridge of the lower jaw was definite, the median point of the neutral zone was positioned 2.0mm to the buccal side, on the average for the molar region, from the crest of the alveolar ridge of the lower jaw. 4. In the cases where the crest of the alveolar ridge of the lower jaw was indefinite, the median point of the neutral zone was positioned 1.9mm to the buccal side, on the average for the molar region, from the mid-point of the width of the alveolar ridge of the lower jaw. 5. The median point of the neutral zone was positioned 3.0mm to the buccal side, on the average for the molar region, from the crest of the alveolar ridge of the upper jaw and 3.1mm to the lingual side from the buccal border of the upper alveolar ridge. 6. The distance between the right and left sides of interalveolar crest lines, the crests of the alveolar ridge, and the median points of the neutral zone was 40.3mm, 41.7mm, and 45.4mm respectively, on the average for the molar region. On the basis of the foregoing, it would be desirable to arrange the artificial teeth in the molar region of the lower jaw about 2mm more to the buccal side than in the conventional method, to achieve a functional posterior teeth arrangement with the crest of the alveolar ridge and the interalveolar crest line as the reference points. Furthermore, in view of the fact that the neutral zone gets narrower at the second molar in about 13% of the cases, arranging premolar at the second molar sites would be suitable to all cases. It is also concluded that arranging teeth to the buccal rather considerably instead of crossbite arrangement would not cause any hindrance functionally in almost all cases.
- 九州歯科学会の論文
- 1980-05-25
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