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Journal of Dental Research
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Regional Alterations in Fiber Type Distribution, Capillary Density, and Blood Flow after Lower Jaw Sagittal Advancement in Pig Masticatory Muscles

T. Gedrange1, B. Walter2, I. Tetzlaff1, M. Kasper3, H. Schubert4, W. Harzer1 and R. Bauer2,*

1 Department of Orthodontics, Technical University, Dresden, Germany;
2 Institute of Pathophysiology, Friedrich Schiller University, D-07740 Jena, Germany;
3 Institute of Anatomy, Technical University, Dresden, Germany; and
4 Institute of Laboratory Animal Science, Jena, Germany;


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  		Figure 1. Effect of long-term lower jaw sagittal advancement of fiber type distribution (upper panel), capillary density (middle panel), and blood flow (lower panel) of masticatory muscles [masseter muscle, superficial part, anterior region (M1), medial region (M2); profound part, posterior region (M3); temporal muscle, anterior (TP1) and posterior (TP2) part; medial pterygoid muscle (PM); geniohyoid muscle (GH)] of juvenile pigs (N = 6, open columns), compared with untreated animals (N = 6, filled columns). Values are expressed as means + SD. *P < 0.05.

 

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  		Figure 2. Masticatory muscle blood flow under resting conditions as a function of capillary density (Number of samples = 84, r = 0.89, P < 0.01). Note that the wide variety of capillary density and muscle blood flow under resting conditions resulted partly from regional remodeling of masticatory muscles after long-term lower jaw sagittal advancement, induced by build-ups on the mandibular molars and premolars for 4 wks.

 

Journal of Dental Research, Vol. 82, No. 7, 570-574 (2003)
DOI: 10.1177/154405910308200716
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