A roentgenographic cephalometric comparison of bite opening efficacy using cervical traction gear, cervical traction gear with meisal spur, and anterior high pull gear
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The effects of extraoral traction on anterior bite opening were studied. Twenty-seven patients were divided into three groups and treated with either cervical traction, cervical traction with incisal spur, or anterior high pull gear. Significant changes in molar extrusion and mandibular plane contributed directly to overbite reduction. The CTG with Kuhn spur exerted maximum influence on these variables. Incisor intrusion, palatal plane and occlusal plane were not shown to be significantly effected by extraoral traction. However, the data was suggestive of vari ability between appliances. Perhaps if the sample size was increased, significant differences might become apparent. The greatest reduction of apical base discrepancy was observed with appliances having posterior force vectors . The anterior high pull gear showed little success in reducing point A.
Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1975. Orthodontics.Bibliography included.
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