Year : 2019

Volume : Volume 10

Issue : Issue 3

Address for correspondence :
Dr. Chandni Bharti.
drchandnibharti@gmail.com

Abstract

Background:  This study is aimed to determine the clinical success rate of orthodontic mini screw implants by investigating the initial( from insertion till force application) & long term stability & to evaluate the various factors associated with the Stability of mini screw implants. Material and methods: The data consisted of 50 mini screw implants in 21 patients with age ranging from 14 to 26 years was selected for the study - all these patients who underwent fixed orthodontic treatment with miniscrews placed as orthodontic anchorage. Micro implants of 1.5 X 9 mm Titanium mini-screws(S.K. Surgicals, Pune) were inserted during fixed orthodontic treatment. All screws were examined for initial Stability- after the insertion, before force application and for long term stability-minimum one month after force application. The examination of Stability was done by manual examination for mobility. Each response variable was dichotomous; the value was recorded as 0 if mini screw loosened (failed) or one of the mini-screws was stable (successful). All the data was recorded on an excel sheet and subjected to statistical analysis. Results: the overall success rate was 88 %. The success rate was higher in younger individuals but deceased as age advanced; males had a higher success rate as compared to females; maxilla had a higher success rate as compared to mandible mid-palatal & maxillary buccal area had a higher success rate than other sites; firm tissue had a higher success rate than movable tissue type although this difference was statically insignificant except for the jaw involved and tissue type. Conclusion: the Stability of the mini screw implants cannot be guaranteed or predicted. For this reason, any treatment plan should consider the possibility of failures.

Keywords: Orthodontic anchorage, primary and secondary Stability, miniscrew, miniscrew failure.