지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
이용수
초록· 키워드
오류제보하기
Objective: The purpose of this study was to predict the optimal bending angles of a running loop for bodily protraction of the mandibular first molars and to clarify the mechanics of molar tipping and rotation. Methods: A threedimensional finite element model was developed for predicting tooth movement, and a mechanical model based on the beam theory was constructed for clarifying force systems. Results: When a running loop without bends was used, the molar tipped mesially by 9.6° and rotated counterclockwise by 5.4°. These angles were almost similar to those predicted by the beam theory. When the amount of tip-back and toe-in angles were 11.5° and 9.9°, respectively, bodily movement of the molar was achieved. When the bend angles were increased to 14.2° and 18.7o, the molar tipped distally by 4.9° and rotated clockwise by 1.5°. Conclusions: Bodily movement of a mandibular first molar was achieved during protraction by controlling the tip-back and toe-in angles with the use of a running loop. The beam theory was effective for understanding the mechanics of molar tipping and rotation, as well as for predicting the optimal bending angles.
목차
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES
참고문헌 (18)
참고문헌 신청
[학술지(정기간행물)] - Proffit WR / 1994 / Forty-year review of extraction frequencies at a university orthodontic clinic / Angle Orthod 64 : 407 ~ 414
[학술지(정기간행물)] - Schoppe RJ / 1964 / An Analysis of second premolar extraction procedures / Angle Orthod 34 : 292 ~ 302
[학술지(정기간행물)] - Brandt S / 1975 / Different extractions for different malocclusions / Am J Orthod 68 : 15 ~ 41
[학술지(정기간행물)] - Na JY / 1996 / Orthodontic treatment with upper first and lower second premolars extracted / Korean J Orthod 26 : 113 ~ 124
[학술지(정기간행물)] - Schumacher HA / 1996 / Analysis of forces and moments in arch guided molar protraction using Class I and Class II elastics. An invitro study / J Orofac Orthop 57 : 4 ~ 14
[학술지(정기간행물)] - Schoppe RJ / 1964 / An Analysis of second premolar extraction procedures / Angle Orthod 34 : 292 ~ 302
[학술지(정기간행물)] - Brandt S / 1975 / Different extractions for different malocclusions / Am J Orthod 68 : 15 ~ 41
[학술지(정기간행물)] - Na JY / 1996 / Orthodontic treatment with upper first and lower second premolars extracted / Korean J Orthod 26 : 113 ~ 124
[학술지(정기간행물)] - Schumacher HA / 1996 / Analysis of forces and moments in arch guided molar protraction using Class I and Class II elastics. An invitro study / J Orofac Orthop 57 : 4 ~ 14
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