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目的 研究正畸临界病例拔牙与否与鼻、颏部形态的关系.方法 按纳入标准选取治疗后侧貌良好并且治疗前为正畸临界病例的患者50例,分为拔牙组及非拔牙组,每组25例.选用29项指标,测量两组病例正畸治疗前的头颅侧位片,研究相应软硬组织形态,并对测量结果用SPSS19.0软件进行独立样本t检验.结果 拔牙组和非拔牙组两组间SNB角、SNPg角、PgNB、U1/SN角、11/MP角、U1/L1角、Pg-NP、SL8项硬组织指标及Prn-NP、FH/NsPos角、FH/SiPos角、ASn、Ls-EP、Li-EP、Cm-Sn-Ls、Li-Si-Pos角8项软组织指标有显著性差异(P＜0.05),反映两组间鼻、颏部形态差异有显著性.结论 本研究发现治疗后侧貌良好的正畸临界患者中,拔牙组鼻、颏部突度相对非拔牙组较小,而非拔牙组中鼻、颏部突度相对较大.“,”Objective To investigate the relationship between orthodontic treatment plan on extraction or non-extraction and morphology of nose and chin.Methods 25 extraction and 25 non-extraction patients with good post-treatment profile and borderline pretreatment condition were selected as two groups.Cephalometric analysis including 29 parameters was performed to compare the hard tissue and soft tissue changes in the two groups.Statistical Analysis was carried out with SPSS 19.0 software.Results There were significant differences in hard tissue parameters such as SNB,SNP,Pg-NB,U1/SN,11/MP,U1/L,Pg-NP and SL.Soft tissue parameters such as Prn-NP,SL,Prn-NP,FH/NsPos,FH/SiPos,A-Sn,Ls-EP,Li-EP,Cm-Sn-ls and Li-Si-Pos showed statistically significant differences.These means significant differences in the morphology of nose and chin in the two groups.Conclusions The extraction cases with good post-treatment lateral profile is good in the border line cases have less prominent nose and chin,while the non-extraction cases have more prominent nose and chin.