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背景:快速扩大牙弓是快速扩大颌骨的有效方法,而与快速扩展相比,缓慢扩展稳定性更高,复发更少,但四圈簧扩弓的长期稳定性少见报道。目的:回顾性分析正畸临床中四圈簧扩大牙弓的临床效果。方法:混合牙列期及恒牙列早期牙弓狭窄患者22例使用四圈簧扩大牙弓至少3mm,在扩大牙弓之前(T1期)、Ⅰ期四圈簧扩弓治疗完成或整个治疗结束(T2期)及治疗完成后2年(T3期)分别制取牙齿石膏研究模型并摄取头颅后前位片,在模型上测量两侧第一恒磨牙之间距离,在后前位片上描点(J点)测量两侧基骨间距离及磨牙倾斜度,评价牙弓扩大的矫正及矫形效果。结果与结论:与扩弓前相比,四圈簧扩弓治疗后患者第一恒磨牙倾斜度和两侧基骨间距离逐渐减小;而四圈簧扩弓治疗后相比,随访2年时,患者两侧第一恒磨牙间距离、第一恒磨牙倾斜度和两侧基骨间距离的差异无显著性意义(P>0.05),提示四圈簧扩大牙弓的长期效果是稳定的,并有矫形效果。
BACKGROUND: The rapid expansion of the dental arch is an effective method for rapidly expanding the jaw. Compared with the rapid expansion, the slow expansion has higher stability and less recurrence. However, the long-term stability of the four-coil expansion is seldom reported. Objective: To retrospectively analyze the clinical effect of four-coil spring enlarging dental arch in orthodontic clinic. Methods: Twenty-two patients with mixed dentition and early dentition were enrolled in this study. Twenty-four patients were enrolled in this study. Twenty-four patients were enrolled in this study. Before enlarging the arch (T1) (T2) and 2 years after the completion of treatment (T3) were prepared dental gypsum model and intake of cranial anterior film, measured on both sides of the first molar on both sides of the distance between the molars in the post-anterior film point ( J point) to measure the distance between both sides of the base bone and the inclination of the molar to evaluate the effect of dental arch enlargement correction and orthopedic. RESULTS AND CONCLUSION: Compared with those before the dilatation, the inclination of the first permanent molars and the distance between the two sides of the base were decreased after the four-coil expansion. , The distance between the first permanent molars on both sides of the patient, the inclination of the first permanent molars and the distance between the two sides of the base bone were not significant (P> 0.05), suggesting that the long-term effect of the four-coil spring expanding dental arch is stable , And have orthopedic effect.