Takuro Sakai
Biographic Data
| ID | 5204479 |
|---|---|
| NAME | Takuro Sakai |
| GIVEN NAMES | Takuro |
| FAMILY NAME | Sakai |
| SIGNATURE | SAKAI T |
| AFFILIATIONS | Aichi Gakuin University |
| ORCID | 0009-0001-9531-5464 |
| VERIFIED | Yes |
| TOTAL WORKS | 26 |
| TOTAL CITATIONS | 23 |
| AUTHOR COUNT | 26 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1954 |
| LATEST PUBLICATION YEAR | 1988 |
| H-INDEX | 2 |
Inter-island variation in tooth size of the Cook islanders, and their biological affinities with other Oceanic people
The dentition of the Cook islanders was metrically examined in terms of inter-island variation and biological population affinity. The mesiodistal and buccolingual crown diameters of the permanent dentition were recorded here on 146 plaster casts of male minors in the Cook Islands. According to the ethnic origin or native island of each subject, the samples have been divided into six population series. The results revealed that Pukapukans were gr…
The Dentition of the Micronesians
In this paper several dental characteristics of the Micronesians were compared with those of three other populations-Pashtuns, Hawaiians and Japanese-the data of which were obtained by one of the present authors, T. SAKAI. The materials used in this study were 194 skulls housed in the Bishop Museum, Honolulu. The Hawaiian samples used for comparison were obtained from the skulls in the same museum. The Japanese and Pashtun samples were the plaste…
Tooth Size and Its Sexual Dimorphism in Colobus Monkeys
The dentitions of three species of Colobus monkeys (Colobus polykomos, Colobus badius, and Colobus verus) are compared metrically for three characters: actual tooth size, rect angle (mesiodistal diameter×buccolingual diameter), and length-breadth index (buccolingual diameter/mesiodistal diameter×100). Comparisons of actual tooth size reveal that in general the smallest tooth size is found in C, verus, a greater tooth size in C, badius, and the la…
A Research on Multivariate Biological Affinity of Tooth Crowns
Biological distances among the Japanese, the Hawaiians and the Pashtuns were calculated using the male permanent dentition. Applied coefficients of distance and similarity were PENROSE's size and shape distances, MAHALANOBIS' generalized distance, canonical variates and Q-mode correlation. And these affinities were again computed in order to produce a shape distance based on Q-mode standardization of the raw data. In addition, HAYASHI's quantific…
The Dentition of the Hawaiians
The author investigated the dentition of the Hawaiians, and made comparisons with the Pashtuns in Afghanistan and the Japanese. The materials for this study were some 300 pre-European skeletons in the Bishop Museum, Honolulu. The materials of the Pashtuns and the Japanese were the plaster casts. The results are summarized as follows:1. The frequencies of the "Mongoloid dental complex" and related characteristics are higher among the Hawaiians tha…
Occlusal surface pattern of the lower molars and the second deciduous molar among the living Polynesians
The occlusal surface pattern of the lower molars and the second deciduous molar among the Polynesians living in Western Samoa was studied on plaster casts. The following are the characteristic traits of this race. The occlusal surface pattern of the first and second lower molars falls within the range of variation of the Mongoloid racial group. In general, the variation of the furrow pattern is remarkable, but the tendency of reduction of number …
Occlusion and Inclination of the Pashtun and Tajik in Afghanistan
We have reported previously on the descriptive features and the size of the dentition of the Pashtun and Tajik in Afghanistan. The present work concerns an occlusion and incisor inclination. The materials used were 111 upper and lower plaster casts of 74 Pashtuns and 37 Tajiks. The materials of the Japanese used in comparative study were 184 upper and lower plaster casts. On these plaster casts vertical overbite, horizontal overbite (overjet) (fi…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: VII. General Conclusion
The authors dercribed the crown characters of the Japanese permanent dentition on the exterior surface of enamel and on the interior surface of dentinoenamel border in previous chapters. The present article gives general conclusion as the last chapter of this work. The junction of the enamel and dentin has been investigated in several ways in the past. We used acid to dissolve away the enamel for our studies of the dentin core, and interpreted ma…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: VI. Mandibular Molar
We have reported on the pattern of the enamel-dentin border of the incisors, canines, premolars and maxillary molars in this journal (vol. 73, no. 3, vol. 75, no. 4, 5, vol. 77, no. 3, vol. 79, no. 4). The present article is the description on the mandibular molars as the sixth chapter of our work. The materials used in this study were 114 mandibular first molars and 77 second molars.The results were summarized as follows:1. On the enamel-dentin …
Tooth Size of the Pashtun and Tajik in Afghanistan
We have reported previously on the descriptive features of the dentition of the Pashtun and Tajik in Afghanistan. The present work concerns an odontometric investigation on the Pashtun and Tajik. The materials used were 114 upper and lower plaster casts of 75 Pashtuns and 39 Tajiks. The materials of the Japanese used in comparative study were 91 upper and lower plaster casts. On these plaster casts mesiodistal and buccolingual crown diameters wer…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: V. Maxillary Molar
We have reported previously on the pattern of the enamel-dentin border of maxillary median incisor, maxillary canine, maxillary premolar and mandibular premolar in this journal (Vol. 73, no. 3, Vol. 75, no, 4, 5, Vol. 77, no. 3). The present article is the description on maxillary molar as the fifth chapter of our work. The material used in this study were 125 maxillary first molars and 100 second molars
AMorphological Study of Enamel-Dentin Border On the Japanese Dentition IV.Mandibular Premolar
Resemblance of Size of Tooth Crown Among Siblings
The dental arches of the siblings apparently resemble one another in their form and measurement values. How about the dimension of tooth crown? This question stimulated the present authors to look into their relation. The materials used in this study are the plaster casts of upper and lower jaws obtained from the inhabitants in Kamiina District, Nagano Prefecture. On these plaster casts mesiodistal and buccolingual crown diameters were measured, …
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: III. Maxillary Premolar
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
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: II. Maxillary Canine
We have reported previously on the morphology of the enamel-dentin border of maxillary median incisor in this journal (Vol. 73, No. 3, 1965). The present article is the description on maxillary canine as the second chapter of our work
Morphological Analysis of the Shovel-shaped Teeth
The shovel-shaped teeth were analysed morphologically in 560 plaster casts of upper and lower jaws obtained from Japanese in Chubu District, and results summarized as follows :(1) The incidence of shovel-shaped incisors and canines is shown in Table 1. It is somewhat lower among Japanese than among other Mongoloids, the Japanese forming a subdivision, different at least from that of Indians or Eskimos, within a division of Mongoloids.(2) A close,…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition
The exterior surface of the enamel layer of the teeth has frequently beensubject of morphological, morphogenetic and anthropological considerations. But regarding the interior surface of the enamel cap (enamel-dentin border), a few studies have been reported. To ascertain the morphological relationships between enamel surface and enamel-dentin border of the maxillary median incisor, the enamel has been artificially removed by means of acids
Labial Surface Pattern on Permanent Upper Incisors of the Japanese
The labial surface pattern of the upper central and lateral incisors in Japanese dentitions was studied. The materials used in this study were the 560 plaster casts of the upper and lower jaws of the Japanese living in the Chubu District of Japan, obtained with alginate impression material. The following results were obtained :1. The labial surface pattern of the upper central and lateral incisors are classified into three major groups according …
Shovel‐shaped incisors among the living Polynesians
A familial study of torus palatinus and torus mandibularis
On the Occlusal Surface Patterns of Cusps of Maxillary Molars in the Recent Japanese especially Reduction of Metacone: 特に遠心頬側咬頭の退化について
There is a distinct tendency in recent man, to enlarge the protocone at the expense of the paracone, the metacone and especially also of the hypocone. We ('56) observed the reduction of the hypocone among recent Japanese and arrived at the conclusion that the Japanese seem to be highly specialized in a trend toward a reduction in the cusp pattern on the maxillary molar.However, there is a tendency in fossil man, to decrease the metacone and in th…
On the "Tuberculum accesorium mediale internum " in Recent Japanese
The tuberculum accessorium mediale internum (termed by SLENKA in 1898) is situated between the metaconid and entoconid in lower permanent molars and has the appearance of an isolated wrinkle. It is sunk between the two cusps, from each of which it is separated by a deep and narrow furrow which extends over the superior half of the lingual surface.The authors investigated the frequency of appearance of the tuberculum accessorium medicale internum …
On the Occlusal Surface Patterns of Cusps of Maxillary Molars in Recent Japanese
The distal-lingual cusp (hypocone) is the most recently acquired structure in the evolution of the upper molar. There is a distinct tendency in recent man for the protocone to enlarge at the expense of the paracone, the metacone and especially also of the hypocone. This process becomes more intense from the first to the third molars so that finally one cusp remains on the lingual side and the originally rhomboid angular tooth assumes a more trian…
On the "Deflecting Wrinkle" in Recent Japanese
[in Japanese]
On the "Dryopithecns Pattern" in Recent Japanese
The Dryopithecus pattern, as described by GREGORY in 1916, has been a subject of study by many anthropologists, and many treatises on the subject have been published, but only a few were studies on Japanese subjects.The authors observed the fissure pattern -in three form (Y, +, X) according to JφRGENSEN'S classification- and the number of cusps by the method of making a plaster cast of the crowns of the first and the second lower molars of 438 Ja…
A familial study of torus palatinus and torus mandibularis
On the "Dryopithecns Pattern" in Recent Japanese
The Dryopithecus pattern, as described by GREGORY in 1916, has been a subject of study by many anthropologists, and many treatises on the subject have been published, but only a few were studies on Japanese subjects.The authors observed the fissure pattern -in three form (Y, +, X) according to JφRGENSEN'S classification- and the number of cusps by the method of making a plaster cast of the crowns of the first and the second lower molars of 438 Ja…
On the "Protostylid" of the Japanese
The protostylid of DAHLBERG (mesio-buccal prominence of DE JONGE) is closely associated with the buccal groove which separates the protoconid from the hypoconid. It is a prominence or ridge of enamel which is limited to the mesial part of the buccal surface of lower permanent molars and lower- deciduous second molars which ascends from the gingival end of the buccal groove and extends mesio-occulusally.On the protostylid of the Japanese, TAKABATA…
On the "Tuberculum accesorium mediale internum " in Recent Japanese
The tuberculum accessorium mediale internum (termed by SLENKA in 1898) is situated between the metaconid and entoconid in lower permanent molars and has the appearance of an isolated wrinkle. It is sunk between the two cusps, from each of which it is separated by a deep and narrow furrow which extends over the superior half of the lingual surface.The authors investigated the frequency of appearance of the tuberculum accessorium medicale internum …
On the Occlusal Surface Patterns of Cusps of Maxillary Molars in Recent Japanese
The distal-lingual cusp (hypocone) is the most recently acquired structure in the evolution of the upper molar. There is a distinct tendency in recent man for the protocone to enlarge at the expense of the paracone, the metacone and especially also of the hypocone. This process becomes more intense from the first to the third molars so that finally one cusp remains on the lingual side and the originally rhomboid angular tooth assumes a more trian…
On the "Deflecting Wrinkle" in Recent Japanese
[in Japanese]
On the "Dryopithecns Pattern" in Recent Japanese
The Dryopithecus pattern, as described by GREGORY in 1916, has been a subject of study by many anthropologists, and many treatises on the subject have been published, but only a few were studies on Japanese subjects.The authors observed the fissure pattern -in three form (Y, +, X) according to JφRGENSEN'S classification- and the number of cusps by the method of making a plaster cast of the crowns of the first and the second lower molars of 438 Ja…
On the Occlusal Surface Patterns of Cusps of Maxillary Molars in the Recent Japanese especially Reduction of Metacone: 特に遠心頬側咬頭の退化について
There is a distinct tendency in recent man, to enlarge the protocone at the expense of the paracone, the metacone and especially also of the hypocone. We ('56) observed the reduction of the hypocone among recent Japanese and arrived at the conclusion that the Japanese seem to be highly specialized in a trend toward a reduction in the cusp pattern on the maxillary molar.However, there is a tendency in fossil man, to decrease the metacone and in th…
A familial study of torus palatinus and torus mandibularis
Shovel‐shaped incisors among the living Polynesians
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition
The exterior surface of the enamel layer of the teeth has frequently beensubject of morphological, morphogenetic and anthropological considerations. But regarding the interior surface of the enamel cap (enamel-dentin border), a few studies have been reported. To ascertain the morphological relationships between enamel surface and enamel-dentin border of the maxillary median incisor, the enamel has been artificially removed by means of acids
Labial Surface Pattern on Permanent Upper Incisors of the Japanese
The labial surface pattern of the upper central and lateral incisors in Japanese dentitions was studied. The materials used in this study were the 560 plaster casts of the upper and lower jaws of the Japanese living in the Chubu District of Japan, obtained with alginate impression material. The following results were obtained :1. The labial surface pattern of the upper central and lateral incisors are classified into three major groups according …
Morphological Analysis of the Shovel-shaped Teeth
The shovel-shaped teeth were analysed morphologically in 560 plaster casts of upper and lower jaws obtained from Japanese in Chubu District, and results summarized as follows :(1) The incidence of shovel-shaped incisors and canines is shown in Table 1. It is somewhat lower among Japanese than among other Mongoloids, the Japanese forming a subdivision, different at least from that of Indians or Eskimos, within a division of Mongoloids.(2) A close,…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: III. Maxillary Premolar
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
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: II. Maxillary Canine
We have reported previously on the morphology of the enamel-dentin border of maxillary median incisor in this journal (Vol. 73, No. 3, 1965). The present article is the description on maxillary canine as the second chapter of our work
Resemblance of Size of Tooth Crown Among Siblings
The dental arches of the siblings apparently resemble one another in their form and measurement values. How about the dimension of tooth crown? This question stimulated the present authors to look into their relation. The materials used in this study are the plaster casts of upper and lower jaws obtained from the inhabitants in Kamiina District, Nagano Prefecture. On these plaster casts mesiodistal and buccolingual crown diameters were measured, …
AMorphological Study of Enamel-Dentin Border On the Japanese Dentition IV.Mandibular Premolar
Tooth Size of the Pashtun and Tajik in Afghanistan
We have reported previously on the descriptive features of the dentition of the Pashtun and Tajik in Afghanistan. The present work concerns an odontometric investigation on the Pashtun and Tajik. The materials used were 114 upper and lower plaster casts of 75 Pashtuns and 39 Tajiks. The materials of the Japanese used in comparative study were 91 upper and lower plaster casts. On these plaster casts mesiodistal and buccolingual crown diameters wer…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: V. Maxillary Molar
We have reported previously on the pattern of the enamel-dentin border of maxillary median incisor, maxillary canine, maxillary premolar and mandibular premolar in this journal (Vol. 73, no. 3, Vol. 75, no, 4, 5, Vol. 77, no. 3). The present article is the description on maxillary molar as the fifth chapter of our work. The material used in this study were 125 maxillary first molars and 100 second molars
Occlusal surface pattern of the lower molars and the second deciduous molar among the living Polynesians
The occlusal surface pattern of the lower molars and the second deciduous molar among the Polynesians living in Western Samoa was studied on plaster casts. The following are the characteristic traits of this race. The occlusal surface pattern of the first and second lower molars falls within the range of variation of the Mongoloid racial group. In general, the variation of the furrow pattern is remarkable, but the tendency of reduction of number …
Occlusion and Inclination of the Pashtun and Tajik in Afghanistan
We have reported previously on the descriptive features and the size of the dentition of the Pashtun and Tajik in Afghanistan. The present work concerns an occlusion and incisor inclination. The materials used were 111 upper and lower plaster casts of 74 Pashtuns and 37 Tajiks. The materials of the Japanese used in comparative study were 184 upper and lower plaster casts. On these plaster casts vertical overbite, horizontal overbite (overjet) (fi…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: VII. General Conclusion
The authors dercribed the crown characters of the Japanese permanent dentition on the exterior surface of enamel and on the interior surface of dentinoenamel border in previous chapters. The present article gives general conclusion as the last chapter of this work. The junction of the enamel and dentin has been investigated in several ways in the past. We used acid to dissolve away the enamel for our studies of the dentin core, and interpreted ma…
A Morphological Study of Enamel-Dentin Border on the Japanese Dentition: VI. Mandibular Molar
We have reported on the pattern of the enamel-dentin border of the incisors, canines, premolars and maxillary molars in this journal (vol. 73, no. 3, vol. 75, no. 4, 5, vol. 77, no. 3, vol. 79, no. 4). The present article is the description on the mandibular molars as the sixth chapter of our work. The materials used in this study were 114 mandibular first molars and 77 second molars.The results were summarized as follows:1. On the enamel-dentin …
The Dentition of the Hawaiians
The author investigated the dentition of the Hawaiians, and made comparisons with the Pashtuns in Afghanistan and the Japanese. The materials for this study were some 300 pre-European skeletons in the Bishop Museum, Honolulu. The materials of the Pashtuns and the Japanese were the plaster casts. The results are summarized as follows:1. The frequencies of the "Mongoloid dental complex" and related characteristics are higher among the Hawaiians tha…
A Research on Multivariate Biological Affinity of Tooth Crowns
Biological distances among the Japanese, the Hawaiians and the Pashtuns were calculated using the male permanent dentition. Applied coefficients of distance and similarity were PENROSE's size and shape distances, MAHALANOBIS' generalized distance, canonical variates and Q-mode correlation. And these affinities were again computed in order to produce a shape distance based on Q-mode standardization of the raw data. In addition, HAYASHI's quantific…
Tooth Size and Its Sexual Dimorphism in Colobus Monkeys
The dentitions of three species of Colobus monkeys (Colobus polykomos, Colobus badius, and Colobus verus) are compared metrically for three characters: actual tooth size, rect angle (mesiodistal diameter×buccolingual diameter), and length-breadth index (buccolingual diameter/mesiodistal diameter×100). Comparisons of actual tooth size reveal that in general the smallest tooth size is found in C, verus, a greater tooth size in C, badius, and the la…
The Dentition of the Micronesians
In this paper several dental characteristics of the Micronesians were compared with those of three other populations-Pashtuns, Hawaiians and Japanese-the data of which were obtained by one of the present authors, T. SAKAI. The materials used in this study were 194 skulls housed in the Bishop Museum, Honolulu. The Hawaiian samples used for comparison were obtained from the skulls in the same museum. The Japanese and Pashtun samples were the plaste…
Medicine (22 works) · Dentistry (18 works) · Orthodontics (17 works) · Orthodontics (17 works) · Molar (13 works) · dental development and anomalies (12 works) · Dentition (11 works) · Biology (8 works) · Mathematics (8 works) · Dentin (7 works)