3Kanneppady SK, Balamanikandasrinivasan, Kumaresan R, et al. A comparative study on radiographic analysis of impacted third molars among three ethnic groups of patients attending AIMST Dental Institute, Malaysia [J]. Dent Res J (Isfahan), 2013, 10(3): 353-358.
4Chaushu S, Abramovitz I, Becker A. Failure in the orthodontic treatment of impacted maxillary canines [J]. Refuat Hapeh Vehashinayim, 2013, 30(2): 45-52.
5Rizzatto SM, de Menezes LM, Allgayer S, et al. Orthodontically induced eruption of a horizontally impacted maxillary central incisor[J]. Am J Orthod Dentofacial Orthop,2013,144(1):119-129.
6Cassetta F, Altieri F, Di Mambro A, et al. Impaction of permanent mandibular second molar: a retrospective study [J]. Med Oral Patol Oral Cir Bucal, 2015, 15(4): e564-568.
7Bereket C, Cakir-Ozkan N, Sener I, et al. Retrospective analysis of impacted first and second permanent molars in the Turkish population: a muhicenter study [J]. Med Oral Patol Oral Cir Bucal, 2011, 16 (7): e874-878.
8Suri L, Gagari E, Vastardis H. Delayed tooth eruption: pathogenesis, diagnosis, and treatment. A literature review[J]. Am J Orthod Dentofacial Orthop,2004,126(4): 432-445.
9Frazier-Bowers SA, Simmons D, Wright JT, et al. Primary failure of eruption and PTH1R: the importance of a genetie diagnosis for orthodontic treatment planning [J]. Am J Orthod Dentofaeial Orthop, 2010, 137(2): 160.e1-7.
