Midpalatal miniscrews for orthodontic anchorage: factors affecting clinical success.
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.
Kim
Young Ho
YH
Department of Orthodontics, Institute of Oral Health & Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
Yang
Seung-Min
SM
Kim
Seonwoo
S
Lee
Joo Yong
JY
Kim
Kyu Eok
KE
Gianelly
Anthony A
AA
Kyung
Seung-Hyun
SH
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