title: Comparison of tooth development stage of the maxillary anterior teeth before and after secondary alveolar bone graft: Unilateral cleft lip and alveolus vs unilateral cleft lip and palate.
abstract: OBJECTIVE
  To compare the effect of secondary alveolar bone graft (SABG) on the tooth development stage of the maxillary central incisor (MXCI) and maxillary canine (MXC) in terms of the severity of unilateral cleft.
  
  
  METHODS
  The subjects consisted of 50 boys with unilateral cleft lip and alveolus (UCLA) or unilateral cleft lip, alveolus, and palate (UCLP). The age- and sex-matched subjects were divided into group 1 (UCLA, n = 25; 9.3 ± 0.8 years old) and group 2 (UCLP, n = 25; 9.4 ± 0.6 years old). In panoramic radiographs taken 1 month before (T0) and 1 year after SABG (T1), tooth development stage was evaluated according to the Nolla developmental (ND) stage. A panoramic radiograph taken 3 years after SABG was used as a reference for the final root length of individual tooth.
  
  
  RESULTS
  In groups 1 and 2, the ND stage of the MXCI did not exhibit differences between the cleft and non-cleft sides at T0 and T1, respectively. However, although the ND stage of the MXC of group 2 was delayed on the cleft side compared with the non-cleft side at T0 (P < .05), the MXC on the cleft side developed faster than that on the non-cleft side after SABG (P < .01). In terms of tooth development speed, group 2 showed a higher rate of faster developed MXCs on the cleft side compared with the non-cleft side after SABG than group 1 (36.0% vs 8.0%, P < .05).
  
  
  CONCLUSIONS
  SABG performed at approximately 9 years of age might increase tooth development speed of MXC in patients with UCLP compared with patients with UCLA.
authors.affiliation: a  PhD Graduate Student, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea.
authors.forename: Heon-Mook
authors.initials: HM
authors.lastname: Park
authors.forename: Dong-Hun
authors.initials: DH
authors.lastname: Han
authors.forename: Seung-Hak
authors.initials: SH
authors.lastname: Baek
mesh_terms: D064728:Alveolar Bone Grafting / Q000379:methods*; D000539:Alveolar Process / Q000002:abnormalities; D016025:Bone Transplantation / Q000379:methods; D016022:Case-Control Studies; D002648:Child; D002971:Cleft Lip / Q000601:surgery*; D002972:Cleft Palate / Q000601:surgery*; D003481:Cuspid / Q000254:growth & development*; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000254:growth & development*; D008297:Male; D009805:Odontogenesis / Q000502:physiology*; D009971:Orthodontics, Corrective; D010155:Palatal Expansion Technique; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D019227:Tooth Apex / Q000254:growth & development; D019228:Tooth Crown / Q000254:growth & development; D014092:Tooth Root / Q000254:growth & development
keywords: Secondary alveolar bone graft; Tooth development stage; Unilateral cleft lip and alveolus; Unilateral cleft lip and palate
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