The relationship between facial protrusion and root length in the dentition of baboons

Siegel, Michael I.

doi:10.1159/000143842

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…In order for the variation in dental and skeletal tissues to be as coordinated as they appear to be, the tissues are either integrated during their development (for example, phenotypic plasticity, developmental linkage), or they are not integrated but each is independently under tight genetic control. The latter alternative, however, is unlikely given the amount of plasticity that has been observed in both the jaws (maxilla and mandible) and the dentition (Riesenfeld, 1970; Riesenfeld & Seigel, 1970; Seigel, 1972; Boughner & Hallgrímsson, 2008; Cobb & Baverstock, 2009a). In order for integration to work effectively both tissues cannot be equally plastic at any one time; one must have greater influence over the other (e.g.…”

Section: Introductionmentioning

confidence: 99%

Balancing the spatial demands of the developing dentition with the mechanical demands of the catarrhine mandibular symphysis

Cobb

Panagiotopoulou

2010

Journal of Anatomy

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The superior transverse torus of the catarrhine mandible has been shown to effectively reduce bending at the symphysis during unilateral postcanine biting. While the adult superior transverse torus contains trabecular bone, the juvenile one is almost entirely filled by developing permanent incisors until their eruption. This study uses finite elements analysis (FEA) to investigate whether the presence of developing incisors in the juvenile symphysis increases strains on the superior transverse torus. Two FE models of a juvenile Macaca fascicularis mandible were created: one included all the developing teeth; the second was modified to remove the incisor tooth crypts by filling them with trabecular bone. The models were loaded identically to simulate static physiological unilateral biting on dp 4 and strain magnitudes, patterns and distributions of the two FE models were compared. The FEA results show a notable increase in strain magnitudes by up to 40% when the developing incisors are present. The results indicate that, in order to maintain the same symphyseal strain magnitudes during chewing, the presence of the incisors in the symphysis necessitates a larger superior transverse torus in the juvenile than would be required if the superior transverse torus did not house the developing incisors. These results highlight the adaptational balance of the symphyseal morphology throughout ontogeny between biomechanics and the spatial demands of the developing dentition. Based on the findings we therefore propose that the spatial requirements of the developing incisors during ontogeny can act as a constraint on the functional adaptation and subsequent adult morphology observed in the catarrhine mandibular symphysis.

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Section: Introductionmentioning

confidence: 99%

Balancing the spatial demands of the developing dentition with the mechanical demands of the catarrhine mandibular symphysis

Cobb

Panagiotopoulou

2010

Journal of Anatomy

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“…Siegel [45] found a direct relationship between the degree of facial pro trusion measured as palatal or mandibular length and tooth root length in the longfaced baboon Papio anubis. The anthropometric data confirmed com parative and experimental findings in rodents and in carnivores suggestive of a biochemical mechanism capable of transmitting changes in the ontogenetic growth rate of the facial skeleton to the roots of the teeth.…”

Section: Surgical Orthodonticsmentioning

confidence: 99%

Monkey Models in Dental Research

Dreizen¹,

Levy²

1977

J Med Primatol

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“…It was found that relative root length of the teeth was short in short-faced dogs and long in long-faced dogs. Finally, it was shown [Siegel, 1972] that in baboons ( Papio anubis) in which facial protrusion varies, there exist significant correlations between dental root length and palatal length and mandibular length as well. Korkhaus [1929] was the first to demon strate that, while the crown and upper two thirds of the roots of human teeth are genetically conditioned, the morphology of the apical third of the root is strongly influenced by environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Relationship between facial protrusion and tooth length in four strains of rats

Riesenfeld¹

1977

Cells Tissues Organs

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Total tooth length was measured in the first lower molar of two short-faced strains of rats (Sprague-Dawley and Buffalo) and two long-faced strains (BN and GRL). Tooth length was significantly longer in the long-faced than in the short-faced strains. The same correlation had previously been found in dogs, baboons and human populations, as well as in rats in which facial shortening was obtained experimentally by septum removal. The data suggest that the same mechanism is responsible for this relationship in all groups.

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The relationship between facial protrusion and root length in the dentition of baboons

Cited by 9 publications

References 2 publications

Balancing the spatial demands of the developing dentition with the mechanical demands of the catarrhine mandibular symphysis

Balancing the spatial demands of the developing dentition with the mechanical demands of the catarrhine mandibular symphysis

Monkey Models in Dental Research

Relationship between facial protrusion and tooth length in four strains of rats

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