2Pinho S, Ciriaco C, Faber J, et al. Impact of dental asymmetries on the perception of smile esthetics[J].Am J Orthod Dentofacial Orthop,2007,132(6) :748-753.
3Ali Fayyad M, Jamani KD, Agrabawi J. Geometric and mathematical proportions and their relations to maxillary anterior teeth[J].J Contemp Dent Pract,2006,7(5):62-70.
4Esposito M, Maghaireh H, Grusovin MG, et a7. Interventions for replacing missing teeth: management of soft tissues for dental implants[J]. Cochrane Database Syst Rev,2012,15(2) :6697.
5Choukroun J, Diss A, Simonpieri A, et a]. Platelet-rich fibrin(PRF): a second-generation platelet concentrate. Part IV: clinical effects on tissue healing[J].Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2006,101 (3) : 56-60.
6Chen Y,Kyung HM,Zhao WT,et al.Critical factors for the success of orthodontic mini-implants:a systematuc review[J].Am J Orthod Dentofacial Orthop,2009,135(3):284-291.
7Pandis N,Vlachopoulos K,Polych ronopoulou A,et al..Periodontal condition of th mandibular anterior dentition in patients with conventionaland self-ligating brackets[J].Orthod Craniofac Res,2008,11(4):211-215.