近親間における歯列弓の歯牙彎曲、歯列弓及び口蓋の形態の類似性

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Similarities in the tooth curve of the dental arch, in the morphological patterns of the dental arch and the palate existing among twins, brother and sister, and parent and children were studied. The regulative curve of the dental arch was measured in the following manner : A Plane was established on upper jaw which included four points in it consisting of mesio-palatal and disto-palatal cusps of the right and left molars, and this plane was conveniently called "The first molar plane" by the author. The heights from this plane to individual teeth of the dental arch were measured in this study, taking the middle points of incisal margins, tips of the cuspids and the cusps of every posterior teeth as measuring bases. The results were summarized as follows. 1) The heights of teeth : The height of the first molar was the lowest, and it became higher successively in the order of the teeth locating frontally. 2) The heights of every teeth were lowest at the age of 15 which increased slightly thereafter. 3) There was hardly any noticeable difference with sexes in the heights of teeth of both sexes. 4) In the similarity study of the tooth height among children of the same parent, it was revealed that there was hardly noticed any difference between brothers and between sisters, and the similarity was the least between elder sister and younger brother, and between elder brother and younger sister. In the similarity study of the regulative curve, it was observed that there was hardly any difference in similarity to be found between brothers and between sisters, and that there was least silmiarity between the male and the female members. 5) The similarity in the tooth height among parentand children was expressed conveniently in the following simplified formulae. father : sons≤farher : daughters mother : sons≦mother : daughters father : sons≒mother : sons father : daughters≥mother : daughters 6) The correlation coefficients of the tooth heights among consanguinous children were as follows. Correlation Coefficients male : male……0.051-0.508 female : female……0.002-0.434 male : female……-0.006-0.302 7) The correlation coefficients between the tooth height and the dental arch breadth, dental arch length and between the palate height were as follows. male……-0.049-0.511 female……-0.039-0.520 The correlation coefficient between the height of first molar and the posterior palatal height proved to be greatest. 8) The correlation coefficientsof the incisal overbite among consanguinous peoples were as follows. Identical twins……0.68-0.86 Fraternal twins males : males females : females}……0.47-0.81 males : females……-0.06-0.14 Siblings……0.03-0.34 parents : children……0.04-0.33 9) The correlation coefficients among consanguinous peoples between the dental arch length and the dental arch breadth were as follows. Identical twins……0.44-0.88 Fraternal twins males : males females : females}……0.56-0.77 males : females……0.32-0.61 Siblings……0.03-0.57 Parents : children……-0.03-0.54 10) The correlation coefficients among consanguinous peoples in the dental arch index were as follows. Identical twins……0.25-0.77 Fraternal twins males : males fewales : fewales}……-0.23-0.76 maless : females……0.20-0.56 Siblings……-0.18-0.09 Parents : children……-0.07-0.35
九州歯科学会の論文

近親間における歯列弓の歯牙彎曲、歯列弓及び口蓋の形態の類似性

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