2Anastasia F,Athena KS,Zaki B,et al.Incidence of impacted and supernumerary teeth-a radiographic study in a North Greek population[J].Med Oral Patol Oral Cir Bucal,2011,16(1):56-61.
3Liu BY,Lo ECM,Chu CH,et al.Randomized trial on fluorides and sealants for fissure caries prevention[J].J Dent Res,2012,91(8):753-758.
4Peterson LJ, Ellis E, Hupp JR, et al. Oral and maxillo- facial surgery[M]. 4th ed. New York:Elsevier Mosby, 2003: 184-214.
5Koemer KR. Manual of minor oral surgery for the gen- eral dentist[M]. New York: Wiley-Blackwell, 2006: 49- 80.
6Wood DL, Hoag PM, Donnenfeld OW, et al. Alveolar crest reduction following full and partial thickness flaps [J]. J Periodontol, 1972, 43(3) : 141-144.
7van der Westhuijzen A J, Becker PJ, Morkel J, et al. A randomized observer blind comparison of bilateral facial ice pack therapy with no ice therapy following third mo- lar surgery[J]. Int J Oral Maxillofac Surg, 2005, 34(3): 281-286.