RESUMEN
Objective To investigate the effect of Orthodontic traction and porcelain in the treatment of anterior teeth subgingival quit.Methods 63 patients with anterior teeth subgingival quit were randomly assigned into observation group and control group,the control group were treated with conventional processing methods,the observation group were treated with orthodontic traction and porcelain repair nethod.the efficient and general treatment were compared.Results In the observation group,there were 12 cases cured,17 cases effective,2 cases ineffective,the total effective rate was 93.55％ (29/31) ; in the control group,there were 9 cases cured,14 cases effective,9 cases ineffctive,the total effective rate was 71.88％ (23/32).There were significantly difference between two groups (x2 =5.1323,P =0.0235).Tooth loose degrees,gingival condition and periodontal status and treatment of bone resorption rates of the observation group were 93.55％,93.55％,100.00％ and 96.77％,significantly higher than the control(71.88％,68.75％,71.88％,75.00％),the differences were statistically significant (all P ＜ 0.05).Crown retention between the two groups showed no significant difference between cases (P ＞ 0.05).Conclusion orthodontictraction has good effect in the treatment of former porcelain subgingival root pruning.