摘要
目的探讨2×4矫治器配合下后牙面树脂垫早期阻断矫治乳前牙反的临床效果。方法乳牙期前牙反患者46例,平均年龄(4.2±0.6)岁,采用2×4矫治器配合下后牙面树脂垫高咬合进行早期阻断矫治。配对t检验比较头颅定位侧位片的牙、颌、面测量值在矫治前后的差异。结果矫治后所有患者乳前牙反解除。与矫治前相比,上中切牙角(UA-SN)增加11.57°(P<0.001),上牙弓长度(is-ms)增加2.26 mm(P<0.01);下中切牙角(LA-MP)减小4.38°(P<0.01),下牙弓长度(ii-mi)减少1.04 mm(P<0.01)。ANB增大1.44°。结论 2×4矫治器配合下后牙面树脂垫是早期阻断矫治乳前牙反的有效方法,患儿易于配合。
Objective The purposes of this study were to investigate the outcome of early interceptive treatment of deciduous anterior crossbites with a 2×4 appliance and posterior occlusal acrylic resin blocks,and to examine the changes of dentofacial morphology after treatment.Methods Forty-six（17 males,29 females;4.2±0.6 years old） subjects with deciduous anterior crossbites were treated with a 2×4 appliance and posterior occlusal acrylic resin blocks.Lateral cephalograms were obtained before and immediately after treatment.The differences in the cephalometric characteristics were compared using a paried t-test.Results All subjects obtained a positive overjet after active treatment of about6 months.UA-SN increased 11.57°（P0.001）;is-ms increased 2.26 mm（P0.01）;LA-MP decreased 4.38°（P0.01）;ii-mi decreased 1.04 mm（P0.01）.ANB increased 1.44°（P0.01）.Conclusion Posterior bite raising and 2×4 appliance therapy are effective interceptive treatments of deciduous anterior crossbites.The young children are cooperative during the treatment period.After treatment the retroclined upper incisors that may cause dental interference during the path of closure of the mandible were proclined.And the lower incisors were tipped lingually to achieve normal overjet which might provide a favorable environment for the maxillary growth.
出处
《广东牙病防治》
2012年第1期14-18,共5页
Journal of Dental Prevention and Treatment
