Journal of the Anthropological Society of Nippon

A Morphological Study of Enamel-Dentin Border on the Japanese Dentition

III. Maxillary Premolar

Takuro SAKAI, Izumi SASAKI, Hajime HANAMURA

1967 Volume 75 Issue 5 Pages 207-223
Published: 1967
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.75.207

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We have reported previously on the morphology of the enamel-dentin border of maxillary median incisor and canines in this journal (Vol. 73, No. 3 and Vol. 75, No. 4). The present article is the description on maxillary premolar as the third chapter of our work. The materials used in this study were 125 extracted maxillary first premolars and 54 second premolars.

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Age and Sex Correlations on the Cross Section of Parietal Hair

Eiki IKOMA, Sadao TSUMOTO, Takeshi MAEBO, Sumiko TAKEDA

1967 Volume 75 Issue 5 Pages 224-229
Published: 1967
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.75.224

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Cross sections of parietal hair of 1024 males and 2046 females of various ages were measured. The maximum and minimum diameters of the hair shaft and the hair index were statistically studied in terms of age and sex.
The maximum and minimum diameters in the cross section of the hair shaft were very variable depending upon age.
In males, both diameters change with a rather linear relationship to age, while in females they show a rather smooth curve relationship. In infancy and childhood, the diameters in males are larger than those in females, but in adults, they are smaller in males than in females.
In females, a diameter to age correlationship shows two phases at 13 and 48 years of age respectively.
Except infancy, in both sexes, the hair index in the cross section of the hair shaft is almost constant irrespective of age.
It seems that studies of parietal hair on the cross section shoud not be made without a careful consideration of age and sex.

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Morphological Observations on the Dentiton of a Giantism Patient and a Dwarfism Patient

Yutaka YAMAZAKI

1967 Volume 75 Issue 5 Pages 230-242
Published: 1967
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.75.230

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The dentitions of both a giantism patient (male, 219cm in stature) and a dwarfism patient (female, 114cm in stature) were studied. The observations and measurements were made on the plaster casts taken from the upper and the lower jaws. Anatomical details of the teeth and the dental arches are to be shown in the photographs, and the measured values are given in the tables.
The results are summarized as follows :
(1) No congenital absent tooth was recognized in both cases.
(2) There was scarcely any anomalous formation to be noticed in the dentition of the giantism patient (Fig. 2), but highly reduced tendencies were observed in that of the dwarfism patient (Fig. 5).
(3) Concerning the tooth size (mesio-distal diameter of the tooth crown) of the giantism patient, the second and the third molars were fairly large, while the remaining teeth approximately showed the average size. But almost all the teeth of the dwarfism patient were very small (Table 3, Fig. 8). It might be suggested that both the enlargement of the second and the third molars in the giantism patient and the reduction of teeth in the dwarfism patient should result from an abnormal condition of the endocrine gland.
(4) The dimensions of the upper and the lower dental arches of the giantism patient were exceedingly large, while those of the dwarfism patient were small in the extreme (Table 4, Fig. 9).
(5) In both cases the form of the dental arches presented a peculiar appearance. In the giantism patient the upper arch showed an oblong and the lower one showed U-form (Fig. 2), whereas the arches of the dwarfism patient were a round form in both the upper and the lower jaws (Fig. 5)
(6) Disharmony between the tooth size and the dimensions of the dental arches in the giantism patient was conpensated by diasthema in the anterior part of the jaws (Table 2, Fig. 2 & 3) and that in the dwarfism patient was made amends by semi-circular tendency of the dental arches as well as zigzag arrangement of the front teeth (Fig. 5 & 6).
(7) Several fairly deep grooves were forming on the surface of front teeth of the dwarfism patient, and these grooves accorded with the lines of perikymata (Fig. 6).
(8) In the giantism patient, one or two accesory cusps exclusive of hypoconulid were observed at the distal border on the occlusal surface of the lower molars (Fig. 11 & 12).

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