摘要
目的:观察改良钟摆矫治器(DistalJet)在远移磨牙 的过程中对于第二磨牙萌出的影响,为临床更好地应用该矫 治器提供参考和依据.方法:临床选取磨牙Ⅱ类关系病例28 (男12,女16)例,平均年龄11.4岁,DistalJet组13(男6,女 7)例,平均年龄10.7岁.选用治疗前后模型及头影侧位片,测 量关于第一及第二磨牙位置的9项线角指标,并于常规非拔 牙矫治组15(男6,女9)例,平均年龄11.9岁,进行两均数t 检验.结果:9项线角指标两组检验均有显著性差异(P< 0.01).第二磨牙萌出过程中发生明显颊向移位.第一磨牙颊 尖与第二磨牙颊尖连线夹角(R)增大(4.2°±0.6°,P< 0.01),同时第一磨牙长轴与SN平面夹角(m2 SN)(°)(治疗 前54.3±3.7,治疗后48.0±3.5),第二磨牙牙体中心与Ptv 距(m2 Ptv)(mm)(治疗前12.8±1.6,治疗后9.7±1.4)差异 显著(P<0.01).结论:第二磨牙未萌出时推第一磨牙远移 可发生第二磨牙的远中颊向的旋转移位,第二磨牙牙体长轴 随第一磨牙而朝远中倾斜.
AIM: To assess the effects of Distal Jet for the first molar distalization on the eruption of maxillary second molar. METHODS: The dental cast and cephalograms of 28 patients with classⅡ malocclusion were analyzed. The group of Distal Jet appliance had 13 patients, and the group of control orthodontics treatment (non-extraction) had 15 patients. 9 linear and proportional, angular measurements were made. Analysis of variance was applied in statistical analysis of the two groups. RESULTS: Significant difference was found in the 9 linear and proportional, angulars measurements in the two groups(P<0.01). The mean mesiobuccal rotation of the second molars was 4.2°±0.6°. The changes of m2-SN (°) (before treatment 54.3±3.7, after treatment 48.0±3.5) and m2-Ptv (mm) (before treatment 12.8±1.6, after treatment 9.7±1.4) in the second molar region indicated that both expansion and tipping occurred in the second molar. CONCLUSION: Mesiobuccal rotation and vestibular drift of second molars occur with the application of Distal Jet for first molar distalization.
出处
《第四军医大学学报》
北大核心
2005年第3期242-244,共3页
Journal of the Fourth Military Medical University
