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KMID : 0361919810110010025
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Korean Journal of Orthodontics
1981 Volume.11 No. 1 p.25 ~ p.29
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AN EXPERIMENTAL STUDY OF THE EFFECTS OF REMOVAL OF THE MASTICATORY MUSCLES ON THE GROWTH OF THE MANDIBLE IN THE GUINEA PIG
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Abstract
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Fifteen young pigs were used in this study. The animals were divided into three groups ; 1. Group for removal of the temporal muscle,
2. Group for removal of the masseter muscle,
3. Group for removal of masseter and internal pterygoid muscles.
The animals were anesthetized with 3.5% chloral hydrate ntraperitoneaily. In the right side the head was shaved.
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The masticatory muscle was removed. The animals were sacrificed four .months later. ´ The ´ head was separated from trunk and cleaned by boiling in a solution of potassiumm hydroxide. The results were as follows ;
1. In the group for removal of the temporal muscle, the Coronoid process of the mandible was resorbed.
2. In the group for removal of the masseter muscle, there was produced asymmetrical growth of
the mandible, attrition of the molar teeth in the control side, and resorption of the mandibular angle.
3. In the group for removahof the Masseter and Internal muscles, the changes were more severe
than that of the group for removal of the masseter muscle. The mandibular angle was completely absent.
4. The growth of the bone seems definitely related to the presence of the muscular tissue actively pulling upon it.
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KEYWORD
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