title: Midpalatal miniscrews for orthodontic anchorage: factors affecting clinical success.
abstract: BACKGROUND
  The purpose of this study was to investigate the success rate of midpalatal miniscrews used for orthodontic anchorage and the factors affecting clinical success.
  
  
  METHODS
  One hundred twenty-eight consecutive patients (101 female, 27 male; mean age, 23.4 years), who received a total of 210 miniscrews in the midpalatal suture area, were examined. Success rates were determined according to 10 clinical variables.
  
  
  RESULTS
  The overall success rates were 88.20% for the total number of patients and 90.80% for the total number of miniscrews. There were no significant associations among success rate and sex, total period of treatment with miniscrews, diameter of miniscrews, types of tooth movements, and variables that represent sagittal and vertical skeletal relationships (ANB, FMA, and Sn-GoGn). The operator's learning curve, patient's age, area (midpalatal or parapalatal), and splinting significantly influenced the success rates. After adjusting for other variables, only 1- splinting-showed a significant effect on the success rate.
  
  
  CONCLUSIONS
  The joining of 2 miniscrews by splinting, placement of the miniscrew in the midpalatal suture, patient's age (especially >15 years), and operator's skill were factors influencing the clinical success of orthodontic miniscrews in the palate.
authors.affiliation: Department of Orthodontics, Institute of Oral Health & Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Young Ho
authors.initials: YH
authors.lastname: Kim
authors.forename: Seung-Min
authors.initials: SM
authors.lastname: Yang
authors.forename: Seonwoo
authors.initials: S
authors.lastname: Kim
authors.forename: Joo Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Kyu Eok
authors.initials: KE
authors.lastname: Kim
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Gianelly
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Kyung
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001863:Bone Screws; D002648:Child; D002983:Clinical Competence; D003393:Cranial Sutures; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D008904:Miniaturization; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D021362:Palate, Hard / Q000601:surgery*; D013165:Splints; D016896:Treatment Outcome; D055815:Young Adult