Predicting Mouth Width from Inter-Canine Width—A 75% Rule

Carl N. Stephan · Maciej Henneberg

70 citations0/0 files storedJournal of Forensic Sciences

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Forensic Anthropology and Bioarchaeology Studies Orthodontics and Dentofacial Orthopedics Face recognition and analysis

Abstract

It has been suggested that inter-canine width plus 57% of the cumulative distance between the lateral aspect of the canines and the pupil centers can be used to estimate mouth width. Evidence also suggests that the distance between the medial irises approximates actual mouth width fairly well. However, these soft tissue prediction guidelines are limited because they rely on accurate medio-lateral positioning of the pupils within the orbits, for which no systematic empirical evidence appears to exist at this stage. It would, therefore, be more appropriate to use only known hard tissue landmarks in mouth width prediction. This study reports the results of using inter-canine width as a percentage of mouth width for its prediction. This method seems favorable in comparison to the other guidelines because it is as accurate, uses known hard tissue landmarks, and does not rely on assumptions concerning pupil location. Estimating mouth width by using the canines alone, therefore, seems the best guideline to use in facial approximation techniques, at least given knowledge existing at this stage.

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References

1963The human skeleton in forensic medicine 1955The human skeleton in forensic medicine. I.1963The Human Skeleton in Forensic Medicine 1998Making faces: using forensic and archaeological evidence 1984Facial sculpture on the skull for identification 2003Facial approximation: An evaluation of mouth‐width determination 1998Making Faces: Using Forensic and Archaeological Evidence 2002Facial Approximation: Globe Projection Guideline Falsified by Exophthalmometry Literature

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2018An overview of the latest developments in facial imaging 2018Assessment of accuracy and recognition of three-dimensional computerized forensic craniofacial reconstruction 2011On Gerasimov’s Plastic Facial Reconstruction Technique: New Insights to Facilitate Repeatability*2008Mouth width prediction in craniofacial identification: cadaver tests of four recent methods, including two techniques for edentulous skulls.2015The big man has a big mouth: Mouth width correlates with perceived leadership ability and actual leadership performance

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