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目的探讨拔牙和非拔牙矫治对安氏Ⅱ1错患者下颌第三磨牙的影响。方法随机选择2005年1月至2007年12月云南省第二人民医院口腔正畸门诊收治的安氏Ⅱ1错患者27例,分为拔牙组15例(矫治拔除4个双尖牙)和非拔牙组12例(保存全牙列矫治),均采用Edgwise矫治技术治疗。对患者治疗完成时的全颌曲面断层片进行各指标测量及比较分析。结果治疗结束后,拔牙组和非拔牙组下颌第三磨牙萌出间隙(BX)均较治疗前分别平均增加2.6mm和0.71mm,组间比较差异有统计学意义(P<0.05);拔牙组下颌第三磨牙近中倾斜角(θ)平均减小4.36°,而非拔牙组则平均增大0.41°,组间比较差异有统计学意义(P<0.01);拔牙组BX与下颌第三磨牙牙冠宽度之比(BX/MD)虽有明显变化,但与非拔牙组比较差异无统计学意义(P>0.05)。结论对于生长期安氏Ⅱ1错患者,拔牙矫治更有利于下颌第三磨牙的正常萌出。
Objective To investigate the effects of extraction and non-extraction on mandibular third molars in patients with AngleⅡ1 malocclusion. Methods 27 cases of Angle Ⅱ 1 malocclusion admitted to Oral Orthodontic Department of Second People’s Hospital of Yunnan Province from January 2005 to December 2007 were randomly selected and divided into extraction group (15 cases) and non-occlusion group (4 cases) Tooth extraction group of 12 cases (preservation of the whole dentition orthodontics), are treated with Edgwise orthodontic treatment. All the patients were treated at the completion of the whole jaw curved surface of each index measurement and comparative analysis. Results After the treatment, the eruption gap (BX) of mandibular third molar in the tooth extraction group and the non-extraction group increased 2.6mm and 0.71mm respectively on average, with significant difference between the two groups (P <0.05) The mean inclination angle (θ) of the third molars decreased by 4.36 ° on average, but the average increase of 0.41 ° in the non-extraction group was statistically significant (P <0.01). The ratio of BX to mandibular third molars Although the ratio of crown width (BX / MD) had significant changes, there was no significant difference compared with non-extraction group (P> 0.05). Conclusion For the patients with Angle ¢ ò1 malformation in the growing stage, tooth extraction is more beneficial to the normal eruption of the third molar of the mandible.