Korean J Orthod.  1981 Jun;11(1):25-30.

An experimental study of the effects of removal of the masticatory muscles on the growth of the mandible in the guinea pig

• Park TS
• Ryu YK

Abstract

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 intraperitoneaily. In the right side the head was shaved. 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.

MeSH Terms

Animals
Chloral Hydrate
Guinea Pigs*
Guinea*
Head
Mandible*
Masseter Muscle
Masticatory Muscles*
Molar
Muscles
Pterygoid Muscles
Swine
Temporal Muscle
Tooth
Chloral Hydrate