种植体支抗与横腭杆在双颌前突患者前牙内收中应用效果比较

目的:比较种植体支抗与横腭杆在双颌前突患者前牙内收中应用效果.方法:将采取拔除4个第一双尖牙方法治疗的42例双颌前突成年患者分为2组,其中24例应用种植体支抗(MS组),18例应用横腭杆作为加强支抗的手段(T组).应用X线头影测量分析2组患者的骨骼、牙齿及软组织变化.结果:治疗后,2组ANB角变化量差异有统计学意义(P<0.01);SN、MP在MS组中减少,在T组中增大,差异有统计学意义(P<0.05);上前牙的内收量在MS组中较T组明显(P<0.01),上颌磨牙及切牙在MS组被压低,而在T组中均有一定程度的伸长(P<0.05);软组织方面,MS组UL-E减小量明显高于T组(P<0.01).结论:微种植体可以在失状向和垂直向提供绝对支抗,并在双颌前突患者的前牙内收中取得令人满意的骨骼、牙齿及软组织变化.

Comparsion of the effects of transpalatal arch and mini-screw on anterior teeth retraction for patients with bimaxillary protrusion

Objective:To compare the effects of transpalatal arch(TPA) and mini-screw(MS) applicated in anterior teeth retraction for patients with bimaxillary protrusion.Methods:Forty-two patients with bimaxillary protrusion treated with pulling four first pairs of fangs were divided into MS group(24 cases),which were used by mini-screw and T group(18 cases),which were used by transpalatal arch for strengthening anchorage.The changes of skeletal,dental and soft tissue of all cases were measured by X-ray.Results:The angle differences of ANB of two groups had statistical significance(P<0.01),SN-MP of MS group decreased,but increased in T group(P<0.05).The adduction quantities of front upper teeth of MS group were obviouser than that of group T.Upper molars and incisor teeth of MS group were kept down,while its were extended in T group(P<0.05).The linear measurement(UL-E) of MS group were significantly higher than that of T group(P<0.01).Conclusions:Mini-screw implants could provide absolute anchorage in vertical and sagittal directions,and can obtain good effects on skeletal,dental and soft tissue.