论文部分内容阅读
目的:比较成人骨性Ⅱ类错患者不同垂直骨面型正畸前、后颏部软组织厚度变化,探讨拔牙矫治对软组织厚度的影响。方法:选择90例成人骨性Ⅱ类错患者为研究对象,将其分为低角、均角及高角组,每组30例。矫治前、后拍摄X线头颅侧位片。分别测量治疗前、后3组颏前点(Pog)、颏下点(Me)、颏顶点(Gn)的软组织厚度变化及Z角、FMIA角变化。结果:治疗前,高角组颏前部软组织厚度(Pog-Pog’)、颏顶部软组织厚度(Gn-Gn’)、颏下部软组织厚度(Me-Me’)均大于其他两组(均P<0.05);高角组Z角均大于其余两组,FMIA值均小于其他两组(均P<0.05)。治疗后,3组Pog-Pog’较治疗前均明显增加(均P<0.05),高角组治疗前、后的变化值高于其他两组(均P<0.05)。治疗后,3组Me-Me’、Gn-Gn’比较,差异均无统计学意义(均P>0.05);高角组治疗后FMIA角较治疗前增大(P<0.05);3组治疗后Z角较治疗前增大(P<0.05)。结论:拔牙矫治对成人骨性Ⅱ类错高角骨面型的颏部软组织厚度影响较大。矫治后上下切牙内收,鼻唇颏关系趋于协调。
OBJECTIVE: To compare the changes of soft tissue thickness before and after chin orthodontics in adult patients with skeletal Class Ⅱ malocclusion, and to explore the effect of extraction on the thickness of soft tissue. Methods: Ninety adult patients with skeletal Class Ⅱ malocclusion were selected as study objects and divided into low angle, average angle and high angle group, 30 cases in each group. Correction before and after shooting X-ray cephalograms. The changes of soft tissue thickness, Z angle and FMIA angle in the anterior pog, submental (Me) and apex (Gn) of the three groups before and after treatment were measured respectively. Results: Before treatment, the thickness of soft tissue (Pog-Pog ’), Gn-Gn’ and Me-Me ’in the anterior horn of the high-angle group were significantly higher than those in the other two groups ). The Z angles of the high-angle group were greater than those of the other two groups, and the FMIA values were less than those of the other two groups (all P <0.05). After treatment, the Pog-Pog ’in three groups were significantly increased (all P <0.05) before and after treatment, while the changes in high angle group before and after treatment were higher than those in the other two groups (all P <0.05). After treatment, there was no significant difference in Me-Me ’and Gn-Gn’ among the three groups (all P> 0.05); the FMIA angle in high-angle group was higher than that before treatment (P <0.05) Z angle than before treatment increased (P <0.05). Conclusion: Tooth extraction treatment has a great effect on the chin soft tissue thickness of adult skeletal Class Ⅱ malocclusion. After correction of the upper and lower incisors adduction, nasolabial chin relationship tends to be coordinated.