替牙期骨性Ⅲ类错牙合咬合重建治疗的研究(3)
2014-05-16 01:28
导读:因此对高角病例或长面型,患儿慎用。本研究中发现8岁之前使用扩弓联合前牵引可获得较为理想的前移上颌骨的效果,对年龄较大些的儿童,同样的治疗
因此对高角病例或长面型,患儿慎用。本研究中发现8岁之前使用扩弓联合前牵引可获得较为理想的前移上颌骨的效果,对年龄较大些的儿童,同样的治疗方法将产生较多的牙齿移动,而与年龄较小的患儿比较骨骼变化相对较小。故对于高角或长面型患儿应尽早矫治,在取得良好矫治结果的基础上,尽量少的或避免对患儿的面型产生不利影响。
对上颌发育不足,而下颌正常或面下三分之一为较长的特殊病例,因面弓下端对下颌的压迫,对治疗是不利的,这种病例可将下颌的颏部支托,转移到其它部位,如双侧眶下的颧骨区,这将有待于今后进一步研究。
总之,对前方牵引和快速扩弓的近远期疗效目前仍存在不同的观点,如何更好地改进矫治装置设计,有效控制影响牵引效果的各种因素,使疗效更加稳定,仍是正畸医师面临的重要课题。关于此种治疗方法的长期稳定性和复发情况,尚有待于进一步研究。
4结论
本研究显示:应用上颌平面牙合垫式矫正器加前方牵引装置后,SNA角增大,A点前移,ANB角增大,SNB角减少。表明应用前方牵引矫正器可以通过对上颌骨、前部颌骨的前方矫形力牵引刺激上颌骨发育,以颏部及额部作为支抗,交互作用抑制下颌骨的生长,且牙齿在矫治过程中发生相应改变,患者软组织侧貌得到改善。早期应用前方牵引矫治器可诱导上颌骨发育,抑制下颌骨过度生长,使上下颌骨发育趋于协调生长,咬合关系重新建立,由原来的Ⅲ类关系变为Ⅰ类关系,改善或阻断Ⅲ类错牙合畸形向更严重的方向发展。
参考文献
(转载自http://www.NSEAC.com中国科教评价网)
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