临界病例拔牙与非拔牙治疗后侧貌突度变化的研究

Changes of Profile Prominence in Borderline Cases with Extraction and Non-extraction Orthodontic Treatment

目的 比较正畸拔牙与不拔牙治疗对临界病例侧貌突度的影响。方法 由5位正畸专家判断出的33个临界病例,根据其实际接受的治疗方式分为3组:①不拔牙治疗组12例患者;②拔4个第一双尖牙治疗组13例患者;③拔4个第二双尖牙治疗组8例患者。用结构重叠法,以眼耳平面(FH平面)为水平参照平面,对33例患者治疗前后头颅侧位片上反映侧貌突度的解剖标志点进行测量和比较。结果 拔牙组和不拔牙组患者治疗后,仅上下切牙的突度有显著性差异(P<0.01);而两种不同的拔牙方式对患者侧貌突度的影响无显著性差异(P>0.05)。结论 对于临界病例,拔牙治疗与不拔牙治疗对侧貌突度的影响主要表现为对上下切牙突度的改变,其对上下基骨及侧貌软组织突度的影响并不明显。

Objective To compare the treatment effect on the prominence of profile in borderline cases between extraction and non-extraction treatment. Methods The sample consisting of 33 borderline cases based on the judgment of 5 orthodontic specialists was divided into three groups according to the treatment way selected by the doctor in charge of the case. Three groups comprised 12 non-extraction cases, 13 four first premolars extraction cases and 8 four second premolars extraction cases. Structure su-perimposition was used to measure landmarks displacements which reflect the change of profile prominence before and after orthodontic treatment using pretreatment FH plane as a frame of reference. Results Only the prominence of upper and lower incisors showed statistically significance between the extraction and non-extraction treatments. There was no statistically significant difference between the extraction of four first premolars and second premolars. Conclusion The main effect of extraction vs. non-extraction on profile of borderline cases is the prominence of upper and lower incisors, while their influences on upper and lower base bone and soft-tissue profile are not obvious.