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Rocker jaws

American Journal of Physical Anthropology

|November 1, 1977

Summary

This summary is machine-generated.

Polynesian mandibles exhibit a distinctive rocker form due to unique cranial base angles and facial heights. These features necessitate specific mandibular growth patterns, resulting in a closed ramus-body angle and the characteristic rocker jaw shape.

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Area of Science:

Anthropology
Human Anatomy
Paleontology

Background:

Polynesian populations exhibit distinct craniofacial morphologies.
Understanding mandibular form is crucial for anthropological studies.

Purpose of the Study:

To investigate the relationship between cranial base angle, upper facial height, and mandibular morphology in adult Polynesians.
To explain the developmental basis of the 'rocker form' mandible.

Main Methods:

Analysis of adult Polynesian skeletal remains.
Measurement of cranial base angle, upper facial height, and mandibular ramus-body angle.
Assessment of antegonial notch presence and mandibular shape.

Main Results:

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Adult Polynesian mandibles predominantly display the 'rocker form'.

Crania show a very open cranial base angle and large upper facial height.

Mandibular growth patterns result in a closed ramus-body angle, antegonial notch absence, and the rocker form.

Conclusions:

The unique cranial morphology of Polynesians drives specific mandibular growth rotations.
These adaptations lead to the characteristic rocker-shaped mandible and loss of the antegonial notch.