• Title/Summary/Keyword: 견치

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A CLINICAL STUDY ON ANCHORAGE CONTROL OF MOLAR ANCHORING SPRING(MAS) DURING RETRACTION OF THE MAXILLARY CANINE (상악 견치 후방견인시 MAS(Molar Anchoring Spring)의 저항원 조절에 대한 임상적 연구)

  • Kim, Sun-Min;Rhee, Joon-No;Row, Joon;Chun, Youn-Sic
    • The korean journal of orthodontics
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    • v.28 no.2 s.67
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    • pp.269-276
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    • 1998

  • In maxillary canine retraction by means of sliding mechanics, we designed MAS(molar anchoring spring) to prevent anchorage loss and uncontrolled tipping of tooth movement and have applied it in clinical cases. The anchorage control of the maxillary first molar and type of tooth movement of the maxillary canine were studied in 31 subjects. The measurements were made on cephalograms, orthopantomograms and dental casts. The obtained results were as follows. 1. In case of the maxillary first molar, there was a little sagittal anchorage loss, but there was no vertical & transverse anchorage loss. 2. In case of the maxillary canine, there was distal tipping movement and also there was a little intrusion tendency.

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A FEM ANALYSIS FOR INITIAL STRESS ON THE UPPER GAMINE BY ORTHODONTIC FORCE OF INTRUSION ARCH WIRE ACTIVATION (Intrusion arch wire activation시 상악 견치에 가해진 초기응력의 유한요소법을 통한 고찰)

  • Kang, Jeong-Weon;Cha, Kyung-Suk;Lee, Jin-Woo
    • The korean journal of orthodontics
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    • v.28 no.3 s.68
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    • pp.391-398
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    • 1998

  • The purpose of this study was to find the distribution and measurement of compressive and tensile stress when intrusi- on arch wire is forced engage with upper canine and to analysis stress at each section through FEM. And we compare compressive and tensile ratio at each section. The results were as follows. 1. At FA point and cemento-enamel junction of upper canine, compressive and tensile force ratio is about the same. 2. At apex, compressive force is the four times as tensile force. ; In intrusion, we show root resorption at apex. 3. At Cemento-enamel junction, the compressive and tensile force show the maximun value except FA Point.

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