title: Root proximity and cortical bone thickness effects on the success rate of orthodontic micro-implants using cone beam computed tomography.
abstract: OBJECTIVE
  To evaluate factors (root proximity and cortical bone thickness) affecting the success rate of orthodontic micro-implants (OMIs) using cone-beam computed tomography (CBCT) images.
  
  
  METHODS
  We examined 172 OMIs (1.2-1.3 mm in diameter, 8 mm in length) implanted into the maxillary buccal alveolar bone of 94 patients (33 men, 61 women) with malocclusion. Root proximity and cortical bone thickness were measured, and the correlations between these measurements and OMI success rates were evaluated.
  
  
  RESULTS
  The overall success rate was 90.7% (156/172). The success rate increased as the distance between the root surface and OMI increased, showing a highly significant statistical correlation (P < .05). As the cortical bone thickness increased, the success rate increased, showing a slight, nonsignificant correlation (P > .05). Thus, the success rate of OMIs was affected more significantly by root proximity than cortical bone thickness.
  
  
  CONCLUSIONS
  When inserting OMIs, increasing the distance from the OMI to the root surface will significantly improve success rates.
authors.affiliation: Department of Orthodontics, School of Dentistry, University of Wonkwang, Iksan, South Korea.
authors.forename: Kyung-Inn
authors.initials: KI
authors.lastname: Min
authors.forename: Sang-Cheol
authors.initials: SC
authors.lastname: Kim
authors.forename: Kyung-Hwa
authors.initials: KH
authors.lastname: Kang
authors.forename: Jin-Hyoung
authors.initials: JH
authors.lastname: Cho
authors.forename: Eon-Hwa
authors.initials: EH
authors.lastname: Lee
authors.forename: Na-Young
authors.initials: NY
authors.lastname: Chang
authors.forename: Jong-Moon
authors.initials: JM
authors.lastname: Chae
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000539:Alveolar Process / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D054893:Cone-Beam Computed Tomography; D015921:Dental Implants; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008437:Maxilla / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D052280:Orthodontic Anchorage Procedures / Q000379:methods*; D012737:Sex Factors; D014092:Tooth Root / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D015921:Dental Implants