隐形矫治器矫治Ⅱ类错[牙合]畸形对颞下颌关节相关角度、间隙变化值的影响

The effect of invisible appliances on the changes in temporomandibular joint angles and gaps in the treatment of Class Ⅱ malocclusion

目的 探讨隐形矫治器矫治Ⅱ类错[牙合]畸形对颞下颌关节的影响。方法 选取Ⅱ类错[牙合]畸形患者70例,采用信封法将患者分为观察组(n=35)和对照组(n=35),观察组给予隐形矫治器矫治,对照组给予自锁托槽矫治器矫治。观察两组颞下颌关节相关角度、间隙变化值等。结果 观察组矫治前后上中切牙长轴与前颅底平面相交的下内角(U1-SN)变化值、上中切牙长轴与鼻根点-上牙槽座点连线交角(U1-NA)变化值分别为(11.05±1.01)°和(4.75±0.76)°,明显高于对照组(P <0.05);观察组矫治前后上颌中切牙、上颌侧切牙、下颌中切牙、下颌侧切牙变化值分别为(0.51±0.21)、(0.40±0.15)、(0.40±0.13)、(0.20±0.05)mm,明显低于对照组(P <0.05);观察组矫治前后菌斑指数(PLI)、牙龈指数(GI)和探诊深度(PD)变化值分别为(0.44±0.19)分、(0.41±0.13)分、(0.38±0.10)mm,明显低于对照组(P <0.05)。结论 隐形矫治器矫治Ⅱ类错[牙合]畸形有较好的应用价值,有利于患者颞下颌关节改善。

Objective To explore the effect of using invisible appliances to correct Class Ⅱ malocclusion on the temporomandibular joint.Methods Seventy patients with Class II malocclusion were selected and divided into an observation group(n = 35) and a control group(n = 35) using the envelope method.The observation group received invisible orthodontic treatment,while the control group received self-locking bracket orthodontic treatment.The changes in temporomandibular joint angles and gaps and so on between the two groups were observed.Results The changes before and after correction of the lower internal angle at the intersection of the long axis of the upper central incisor and the anterior skull base plane(U1-SN),angle between the long axis of the upper central incisor and the line connecting the nasal root point and the upper alveolar seating point(U1-NA) in the observation group were(11.05 ± 1.01) ° and(4.75 ± 0.76) °,respectively,which were significantly higher than those in the control group(P < 0.05).The changes in maxillary central incisors,maxillary lateral incisors,mandibular central incisors,and mandibular lateral incisors before and after treatment in the observation group were(0.51 ± 0.21) mm,(0.40 ± 0.15) mm,(0.40 ± 0.13) mm,and(0.20 ± 0.05) mm,respectively,which were significantly lower than those in the control group(P < 0.05).The changes in Plaque Index(PLI),Gingival Index(GI),and Exploration Depth(PD) before and after correction in the observation group were(0.44 ± 0.19) points,(0.41 ± 0.13) points,and(0.38 ± 0.10) mm,respectively,which were significantly lower than those in the control group(P < 0.05).Conclusion Invisible appliances have good application value in correcting Class Ⅱ malocclusion,which is beneficial for improving the temporomandibular joint of patients.