Asymmetric head-gear: unilateral shortening vs. expansion of outer-bow
محل انتشار: دوفصلنامه ارتودنسی ایران، دوره: 3، شماره: 1
سال انتشار: 1387
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 107
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شناسه ملی سند علمی:
JR_ORTHO-3-1_002
تاریخ نمایه سازی: 25 بهمن 1400
چکیده مقاله:
Aim: To analysis the effect of unilateral shortening (Asymmetric Length, AL type) vs. expansion of head-gear outer-bow (Asymmetric Expansion, AE type) in delivering unilateral distal force.Methods: In ۳۶ situations, composed or different outer-bow shortening, expansion and different neck contour and position, the resultant distal force was analyzed. Applying an analysis described by Haack and Wienstein, the ratio by which the resultant distal force was divided between ۲ terminal molars was calculated.Results: In AL type head-gear a greater portion of force was delivered to contra-lateral terminal while in AE type headgear the ratio of force delivery between two molars could not be higher than ۱.۰۴ due to geometrical limitations.Conclusion: AL type head-gear is a predictable and effective way for asymmetric distal force delivery. The greater force will be received by the contra-lateral terminal to the shorter arm of the outer-bow. AE type is not suggested for distal force delivery due to its geometric limitation and relative ineffectiveness.
کلیدواژه ها:
نویسندگان
Allahyar Geramy
Department of Orthodontics, Tehran University of Medical Sciences, Dental Research Center(DRC-TUMS)
Seyed Amir Reza Fatahi Meybodi
Post graduate student, Department of Orthodontics, Tehran University of Medical Sciecnes
Amir Hooman Sadr Haghighi
Post graduate student, Department of Orthodontics, Tehran University of Medical Sciecnes