title: A digital volumetric tomography (DVT) study in the mandibular molar region for miniscrew placement during mixed dentition.
abstract: OBJECTIVE
  To assess bone thickness for miniscrew placement in the mandible during mixed dentition by using digital volumetric tomograph (DVT).
  
  
  METHODS
  A total of 15 healthy patients aged 8-10 years old, with early exfoliated mandibular second deciduous molar, were included. DVT images of one quadrant of the mandible were obtained using Kodak extraoral imaging systems and analyzed by Kodak dental imaging software. The error of the method (EM) was calculated using Dahlberg's formula. Mean and standard deviation were calculated at 6 and 8 mm from the cementoenamel junction (CEJ).Paired t-test was used to analyze the measurements.
  
  
  RESULTS
  Buccal cortical bone thickness, mesiodistal width and buccolingual bone depth at 6 mm were found to be 1.73 + 0.41, 2.15 + 0.49 and 13.18 + 1.22 mm, respectively; while at 8 mm measurements were 2.42 + 0.34, 2.48 + 0.33 and 13.65 + 1.25 mm, respectively. EM for buccal cortical bone thickness, mesiodistal width and buccolingual bone depth was 0.58, 0.40 and 0.48, respectively. The difference in measurement at 6 and 8 mm for buccal cortical plate thickness (P < 0.05) and buccolingual bone thickness (P < 0.05) was found to be significant, whereas for mesiodistal width it was insignificant (P > 0.05).
  
  
  CONCLUSIONS
  Bone thickness measurement has shown promising evidence for safe placement of miniscrews in the mandible during mixed dentition. The use of miniscrew is the best alternative, even in younger patients.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Sharad Pawar Dental College and Hospital, Wardha, Maharashtra, India.
authors.forename: Mayur S
authors.initials: MS
authors.lastname: Bhattad
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Sharad Pawar Dental College and Hospital, Wardha, Maharashtra, India.
authors.forename: Sudhindra
authors.initials: S
authors.lastname: Baliga
authors.affiliation: Department of Orthodontics, Sharad Pawar Dental College and Hospital, Wardha, Maharashtra, India.
authors.forename: Pavan
authors.initials: P
authors.lastname: Vibhute
mesh_terms: D001863:Bone Screws; D002508:Cephalometry / Q000379:methods; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003818:Dentition, Mixed; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008334:Mandible / Q000000981:diagnostic imaging*; D008904:Miniaturization; D008963:Molar / Q000000981:diagnostic imaging*; D009929:Organ Size; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods; D019237:Tooth Cervix / Q000000981:diagnostic imaging