Stephan and Henneberg used the inter-canine width to estimate the width of the mouth. The authors are from the University of Adelaide, Australia.
(1) forensic anthropology: reconstruction of facial features from skull dimensions
(2) cosmetic dentistry
(3) evaluation of patients with scleroderma or perioral burns
(1) Mouth width is the distance from chelion to chelion with the mouth relaxed.
(2) Inter-canine distance is the distance between the most lateral aspects of the canines.
ratio of intercanine width to resting mouth width =
mouth width in cm =
= (intercanine width in cm) / 0.758
If the race and gender of the person is known, the following more specific factors can be used.
• An asymmetrical position of the mouth relative to the teeth could affect the accuracy of a reconstruction.
• The study was based on 93 subjects, but the ages were not stated. The results should apply to adults but I am not sure about the young or elderly.
• I am not sure if there is any difference in the inter-canine measurements for the maxillary or mandibular canines.
• The study was done based on photographs. If the measurement was done directly on the person then the slight curvature of the teeth would need to be accounted for.
• The study assumes normal dentition. Severe abnormalities of the dentition and malocclusion would invalidate the method.
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