利用压低辅弓增加后牙支抗的生物力学研究  

Biomechanical analysis of anchorage reinforcement by intrusion arch

作　　者：张栋梁[1] 周春华[1] 王旭 陈云 白玉兴[1] 

机构地区：[1]首都医科大学附属北京口腔医院正畸科,北京100006 [2]煤炭总医院口腔科,北京100028 [3]顺义区天竺镇卫生院,北京101300

出　　处：《中华口腔正畸学杂志》2011年第3期144-148,共5页Chinese Journal of Orthodontics

摘　　要：目的确定远中移动尖牙时，使用压低辅弓增加后牙支抗的最适后倾弯角度。方法按照Burstone方法弯制0．017×0．025英寸（1英寸-2．54cm）伊钛丝（TMA）的压低辅弓，主弓丝采用0．016×0．016英寸不锈钢丝，拉尖牙远中移动的拉簧为150g力。设计后倾弯分别为20°、30°、40°，采用口外正畸模拟生物力学检测系统（OrthodonticMeasurementandSimulationSystem，（）Mss）模拟临床加力，分别测量三维状态下切牙段、尖牙段和后牙段受力和力矩情况。结果尖牙远移过程中，无压低辅弓时，尖牙远中移动并倾斜，磨牙近中倾斜10°；压低辅弓的后倾弯为20°时，尖牙远中移动并倾斜，磨牙近中倾斜5°；后倾弯为30°时，尖牙远中移动基本保持直立，磨牙远中倾斜5°；后倾弯为10。时，尖牙远中移动有压低倾向，磨牙远中倾斜超过10°。结论尖牙远中移动时，弯制有30。后倾弯的乐低辅弓既能够增加后牙专精．又不影响前牙的覆[牙合]覆盖。Objective To determine the suitable anchorage bend in intrusion arch for anchorage reinforcement while retracting canines. Methods According to Burstone segmental arch wire technique, intrusion arch were fabricated by 0.017＂× 0. 025＂ beta titanium alloy（ TMA）, and working arch wire were fabricated by 0. 016＂ × 0. 016＂ stainless steel archwire, meanwhile canines were retracted distally by spring coil with 150 g force. OMSS were used to imitate the situation in clinic. Force and moments were measured three dimensionally at incisor segment, canine segment and posterior segment with 20, 30, 40 degree bite-opening bend in the intrusion arch separately. Results OMSS test showed that molar segment tipped mesially by 10 degree without intrusion arch, and molar segment tipped mesially by 5 degree while canine retracted distally when intrusion arch were activated by 20 degree tip back, and molar segment tipped distally by 5 degree while canine retracted and translated distally and with the aid of intrusion arch activated by 30 degree tip back, molar segment tipped distally by more than 10 degree while canine retracted and tipped distally with the aid of intrusion arch activated by 40 degree tip back. Conclusions Intrusion arch activated by 30 degree is ureferred for the best anchoraue reinforcement while canine retracted distallv.

关 键 词：压低辅弓 支抗曲 

分 类 号：R783.5[医药卫生—口腔医学]