Genetic Study on Mandibular Prognathism by Multivariate Analysis

Ishiguro, Kenji

doi:10.5357/koubyou.38.58

Cited by 6 publications

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“…The results of this study emphasized the role of genetic and environmental factors controlling craniofacial shape, although the general consensus holds that genetic factors predominate [Ishiguro, 1971;Krogman, 1974;Festing, 1976]. Recently, however, there has been growing realization that the interplay between these two factors is far more complex than traditionally envisioned [Gould, 1980;Sawin and Hamlet, 1970;Gruneberg, 1980].…”

Section: Discussionmentioning

confidence: 98%

Study of Mandibular Shape in the Mouse

Lavelle¹

1983

Cells Tissues Organs

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Mandibular shape was compared by the technique of medial axis transformation between four inbred strains of mice fed upon ‘hard’ and ‘soft’ diets. Multivariate analysis of component medial axis lengths showed the interstrain contrasts to be slightly greater between animals maintained on ‘hard’ as opposed to ‘soft’ diets. The mandibular shape contrasts primarily reflected differences of the ramus compared with the corpus, although the reasons for such changes have yet to be fully investigated.

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Section: Discussionmentioning

confidence: 98%

Study of Mandibular Shape in the Mouse

Lavelle¹

1983

Cells Tissues Organs

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“…The present consensus holds that craniofacial, including mandibular, form is primarily influenced by genetic factors [Ishiguro, 1971], although such control is far more complex than traditionally envisaged [Atchley et al, 1984]. Mandibular form is also markedly influ enced by muscular factors [Washburn, 1947], although they may be partly determined by genetic influences.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Mandibular and Neurocranial Form

Lavelle¹

1986

Cells Tissues Organs

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In a study of mandibular form, 19 traditional linear dimensions were found to be consistently greater for macrocephalics than microcephalies. As such dimensions combine both size and shape parameters together, their interpretation proved difficult. In order to examine specifically mandibular shape only, each mandibular outline form was digitized and subjected to the technique of medial axis transformation. The data indicate that the shape contrasts between the mandibles of macrocepahlics and microcephalies are more complex than traditionally envisaged and emphasize the need for further study to ascertain the effect of genetic and environmental influences on mandibular form.

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A factor analysis of cranial base and vault dimensions in children

Ohtsuki

Mukherjee

Lewis

et al. 1982

American J Phys Anthropol

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Lengths within the cranial base and vault were measured in cephalometric radiographs of 220 boys and 177 girls ranging in age from 0 to 15 years; all these children are participants in The Fels Longitudinal Growth Study. The present study is based on mixed longitudinal data derived from 1640 radiographs for boys and 1260 radiographs for girls. Factor analysis was applied separately for boys and girls for each age group; i.e., 0-3, 4-6, 7-9, 10-12, and 13-15 years. For the 0-3 year age group, two factors were extracted in each sex, whereas four factors were extracted in the rest of the age groups. The factor structures are similar in the three older age groups of boys (7-9, 10-12, and 13-15 years). The first four factors for these groups are labelled, respectively: cranial vault size, posterior cranial base length, presphenoid length, and basisphenoid length. The order of the third and fourth factors is reversed in the 7-9 year olds. For girls, the factors extracted were also the same in both the 7-9 and 10-12 year age groups, even though the order of factors was different between age groups; i.e., anterior cranial base length, cranial vault size, basisphenoid length, and basioccipital length. Differential growth rates among cranial base dimensions probably cause changes in factor patterns. Obliteration of the spheno-occipital synchondrosis is suggested as the mechanism responsible for the change of factor pattern in the girls. closure of this synchondrosis would have occurred too late to affect the patterns in boys.

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Genetic Study on Mandibular Prognathism by Multivariate Analysis

Cited by 6 publications

References 0 publications

Study of Mandibular Shape in the Mouse

Study of Mandibular Shape in the Mouse

Investigation of Mandibular and Neurocranial Form

A factor analysis of cranial base and vault dimensions in children

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