Abstract:
The aim of this study was to evaluate the success rates and find factors
affecting the clinical success of screw implants used as orthodontic Anchorage. Two
hundred and seventy seven screw implants of 5 commercial brands were evaluated
in 104 patients (79 female, 25 male; mean age, 30.56 years). Success rates were
determined according to 14 clinical variables. The overall success rate was 80.14%.
The following clinical variables: gender, ethnicity, growth pattern, side of placement,
occlusogingival position, diameter and type of screw, and method of force application
did not show any statistical differences in success rates. Age, jaw and site of
placement, length of screw implants, immediate force application and root proximity
showed significant differences in success rates. Screws placed in the maxilla had a
significantly higher success rate than those in the mandible. Immediate force
application contributes to a high success rate than those that remain unload after
placement. Root proximity is a risk factor for the failure of screw anchorage.
