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KMID : 0355219880130010061
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Journal of Korean Academy Oral Medicine
1988 Volume.13 No. 1 p.61 ~ p.70
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A Histochemical Study of the Masseter Muscle Fibers of White Rat with Unilateral Edentulous Jaw
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Abstract
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The study of the muscle fiber composition and the muscle fiber type conversion during unilateral edentulous condition was undertaken in the rostral superficial masseter muscle of the white rat.
16 4-week-old male white rats weighing approximately 130 gm that crowns of left upper and lower molare were cut intentionally, were divided into 4 groups (one control group and 3 experimental groups).
After experimental groups were sacrificied by etherization in 6 days (E 1), 18 days (E3) and 36 days (E3) separately, samples of the rostral superficial masseter muscle were obtained bilaterally and the proportion of type I, type HA, type IIB and type IIC fibers was determined and counted according to their histochemical activity of myosin ATPasc (at pH 9.4, pH 4.6 and pH 4.2) and PAS staining.
The obtained results were as foliows;
1. The rostral superficial masseter muscle of the white rat contained approximately 47.5%-type I fiber and 52.596 type II fiber.
2: Type I/Type II ratio off molar-present side was increased significantly in the group F.2 (18 days group).
3. Type HA fiber was increased at molar-present side and decreased at molar-absent side in experimental groups.
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