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Journal of Dental Research
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Mandibular Biomechanics and Development of the Human Chin

I. Ichim, M. Swain and J.A. Kieser*

Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand


Figure 1
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  		Figure 1. Models of chinned (a) and chinless (b) mandibles morphed from a CT scan showing cortical and medullary bone. The vectoral muscle components are applied to the muscular areas of origin (c). Meshed models as occlusally loaded for molar bite (d) and incision (e).

 

Figure 2
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  		Figure 2. Strain distribution along the lower border (top) and mid-corpus (bottom) of chinned and non-chinned mandibular models under molar biting. The left side is the working side.

 

Figure 3
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  		Figure 3. Strain plots of chinned and flat-symphysis models during molar biting. The sections have the cancellous bone removed and are facing the working side of the corpus. Note the small differences in symphyseal low-strain for all 4 cases, on both the buccal and lingual aspects. Scale calibrated to a range of 100–2500 µ{varepsilon}.

 

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  		Figure 4. Calculated strains as compared with the bone mechanostat (not to scale). Values for both chinned and non-chinned designs are within the maintenance interval (see text for details).

 

Journal of Dental Research, Vol. 85, No. 7, 638-642 (2006)
DOI: 10.1177/154405910608500711
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