歯牙の排列に関する計測学的研究
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概要
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Biometric measurements have been conducted on the distances from every incisal edges and occlusal tips of upper and lower dentitions to the Camper′s plane. A total of 94 individuals consisting of 44 males and 50 females from 18 to 23 of age were selected as the subjects according to a criterion that their teeth were sound in every respects, free from marked attrition and erosion, and the occlusion was normal as strictly as possible. Plaster models were prepared from alginate impressions of upper and lower jaws, and these were mounted on the specially designed apparatus following the preparation tecnipue of gnathostatic model routinely used in the orthodontic practice. On this jaw model, the basal plane of upper jaw was placed so as to come parallel to the Camper′s plane. In Fig.1 and 2 the method and apparatus were illustrated. The conclusions were reached as follows. It was confirmed that the plane including the mesial incisal edges of both central incisors and the buccal distal cusps of both second molars in lower jaw was not parallel to the Camper′s plane as it has been supposed so, because the present study has revealed that the former point of jaw were closer than the latter points to the Camper′s plane by 1.5 millimeters. Hence, for the purpose of utilizing the occlusal plane in denture work which is nearest parallel to the Camper′s plane, one would have to select either the one which connects the buccal cusps of both first premolars and the buccal distal cusps of both second molars in lower jaw, or the one which connects the buccal distal cusps of first and second premolars and the buccal distal cusp of first molar in upper jaw. Also it must be noted that in upper jaw the buccal distal cusp of first molar is lower than its mesial cusp, and among all the cusps in buccal side those of the first and second premolars are the lowest, while among all the cusps in lingual side the mesial cusp of first molar is the lowest. In lower jaw, the distal cusp of first molar is lowest among the buccal cusps of all teeth, while among the lingual cusps that of first premolar is lowest. The author believes that these facts as revealed in the present study must be taken into account by the clinicians in the practice of arranging the artificial teeth on denture plate.
- 九州歯科学会の論文
- 1958-09-30
著者
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