5Thilander H,Thilander B,Persson G.Treatment of impacted teeth by surgical exposure.A survey study[J].Sven Tandlak Tidskr,1973,66(6):519-525.
6Dachi SF,Howell FV.A survey of 3,874 routine full-month radiographs.II.A study of impacted teeth[J].Oral Surg Oral Med Oral Pathol,1961,14(10):1165-1169.
7Bass TB.Observations on the misplaced upper canine tooth[J].Dent Pract Dent Rec,1967,18(1):25-33.
8Johnston WD.Treatment of palatally impacted canine teeth[J].Am J Orthod,1969,56(6):589-596.
9Quirynen M,OpHeij DG,Adriansens A,et al.Periodontal health of orthodontically extruded impacted teeth.A split-mouth,long-term clinical evaluation[J].J Periodontol,2000,71(11):1708-1714.
10Witsenburg B,Boering G.Eruption of impacted permanent upper incisors after removal of supernumerary teeth[J].Int J Oral Surg,1981,10(6):423-431.
