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目的:研究骨密度对正畸支抗稳定性的影响。方法:选择进行正畸治疗,需要拔除4颗第一前磨牙及弱支抗矫治的安氏Ⅰ类错牙合的健康男性患者212名,年龄18-25周岁,其中支抗失控患者16名,支抗稳定患者196名,通过双能X线骨密度仪测定每位患者4颗第二前磨牙根尖区周围0.5 cm2范围区域的骨密度,并运用统计学方法进行对比分析。结果:经单因素方差分析,两组患者第二前磨牙区域骨密度值具有显著性差异(P<0.05)。结论:骨密度可能是影响正畸支抗稳定性的因素,在正畸支抗设计时应列为参考指标之一。
Objective: To study the effect of bone mineral density on the stability of orthodontic anchorage. Methods: To choose orthodontic treatment, we need to remove 212 healthy male patients with Class Ⅰ malocclusion treated by first premolar and weak braces, aged 18-25 years old, including 16 patients with uncontrolled uncontrolled limbs, 196 patients with stable stability were measured by dual-energy X-ray absorptiometry in each patient 4 second molar area around 0.5 cm2 around the apical area of bone mineral density, and the use of statistical methods for comparative analysis. Results: The BMD of the second premolar area had significant difference (P <0.05) by single factor analysis of variance. Conclusion: BMD may be the factor that affects the stability of orthodontic support. It should be listed as one of the reference indexes in orthodontic support design.