Comparative dental development and microstructure ofProconsulteeth from Rusinga Island, Kenya

Beynon, A.D.; Dean, Christopher; Leakey, Meave G.; Reid, Donald J.; Walker, Alan

doi:10.1006/jhev.1998.0230

Cited by 111 publications

(96 citation statements)

References 50 publications

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“…Others made a thin section through the mesial cusps, and lapped this from either side to reveal the EDJ apices (e.g. Beynon et al, 1998;Reid et al, 1998). This method would be accurate so long as the EDJ cups tips occurred within the initial thin section.…”

Section: Measurements and Methodological Considerations Problem Of Sementioning

confidence: 99%

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

Suwa

Kono

2005

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Enamel thickness was investigated in the mesial cusp section of 167 unworn human molars by means of non-destructive micro-CT based methodology. Serial sections of the entire crown were taken at a voxel resolution of 28 microns, and the initial volume data set of each molar was standardized in orientation to obtain a vertical section that accurately contains the dentine tips of the two mesial cusps. Enamel thickness at the cusp tips, occlusal basin, and lateral crown face was measured in the mesial cusp section and in sections offset from that section by 0.6 mm. We found that thickness at the cusp tips may be overestimated in offset sections by up to about 1 mm, and those of the occlusal basin overestimated or underestimated by up to about 0.5 mm. We also found that maximum 'radial' thickness of the lateral crown face was least affected by section position, usually with discrepancies of less than about 0.1-0.2 mm. In all serial positions in both upper and lower molars, a 'functional' (lingual in uppers and buccal in lowers) to 'non-functional' side gradient in enamel thickness was observed in cusp tip, occlusal basin, and lateral crown face enamel, with the exception of the characteristically thin enamel at the protoconid and paracone cusp tips. Serial differences in thickness were seen between the thinner M1 and the two posterior molars in many but not all measures of thickness, the pattern of which appears to be influenced by the thin M1 mesiobuccal cusp enamel. Individual variation of maximum lateral thickness, the least variable measure of thickness, was found to be substantial (a 30-60% range) even with serial and buccolingual positions controlled. Correlation between whole crown average enamel thickness and maximum lateral thickness was high, indicating that the latter is a potentially useful predictor of overall enamel thickness of the molar crown. The present results indicate that interspecific comparisons of enamel thickness must be made with careful attention to positional placement of thickness measures, potential serial differences, and intraspecific variation.

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Section: Measurements and Methodological Considerations Problem Of Sementioning

confidence: 99%

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

Suwa

Kono

2005

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“…All incisors, canines, and molars were examined using a binocular microscope. Tooth crowns displaying well-preserved perikymata on the enamel surface were replicated using a Coltene putty-wash technique (see Beynon et al, 1998b). The molds were then cast in Logitech epoxy resin and sputter coated with 20 nm of gold, which enhances the visibility of features under reflective light microscopy.…”

Section: Methodsmentioning

confidence: 99%

Dental development and life history in Anapithecus hernyaki

Nargolwalla

Begun

Dean

et al. 2005

Journal of Human Evolution

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“…2 shows, the ages of eruption of the permanent teeth are not significantly different in captive male and female chimpanzees, and in a pooled sample of captive gorillas. Given these similarities, as well as those of various fossil apes (e.g., Beynon et al, 1998;Kelley and Smith, 2003), it is reasonable to assume that the sequence and relative timing of dental development in bonobos and chimps are sufficiently similar to compare them using the same criteria. Put differently, it would be surprising if the general sequence, pattern, and relative rate of eruption of the dentition in bonobos differed significantly from that of other African apes.…”

Section: Agingmentioning

confidence: 99%

A geometric morphometric analysis of heterochrony in the cranium of chimpanzees and bonobos

Lieberman

Carlo

León

et al. 2007

Journal of Human Evolution

102

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Comparative dental development and microstructure ofProconsulteeth from Rusinga Island, Kenya

Cited by 111 publications

References 50 publications

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

A micro-CT based study of linear enamel thickness in the mesial cusp section of human molars: reevaluation of methodology and assessment of within-tooth, serial, and individual variation

Dental development and life history in Anapithecus hernyaki

A geometric morphometric analysis of heterochrony in the cranium of chimpanzees and bonobos

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