Abstract
BackgroundThe purpose of this retrospective cohort study was to investigate the success rates of orthodontic mini-implants (OMIs) placed in different insertion sites and to analyse patient and site- related factors that influence mini-implant survival.MethodsThree hundred eighty-seven OMIs were inserted in 239 patients for orthodontic anchorage and were loaded with a force greater than 2 N. Two different insertion sites were compared: 1. buccal inter-radicular and 2. palatal, at the level of the third palatal ruga. Survival was analysed for location and select patient parameters (age, gender and oral hygiene). The level of statistical significance was set at p < 0.05.ResultsThe overall success rate was 89.1%. There were statistically significant differences between insertion sites; success rate was 98.4% for OMIs placed in the anterior palate and 71% for OMIs inserted buccal between roots (p < 0.001).ConclusionsSuccess rate of OMIs was primarily affected by the insertion site. The anterior palate was a more successful location compared to buccal alveolar bone.
Highlights
The purpose of this retrospective cohort study was to investigate the success rates of orthodontic mini-implants (OMIs) placed in different insertion sites and to analyse patient and site- related factors that influence mini-implant survival
Analysis by anatomical site Significant differences in success rates were observed between the palatal and the inter-radicular insertion site (Table 1)
2 out of 190 palatal OMIs were lost. Those were inserted in the same patient, providing anchorage for molar distalization; The implants had to be removed before the treatment objectives had been achieved because they were loose
Summary
The purpose of this retrospective cohort study was to investigate the success rates of orthodontic mini-implants (OMIs) placed in different insertion sites and to analyse patient and site- related factors that influence mini-implant survival. The introduction of temporary anchorage devices (TADs) for skeletal anchorage in orthodontics promised to improve biomechanical possibilities for tooth movement [1, 2]; orthodontic mini-implants (OMIs) are the smallest TADs available [3]. Due to their reduced size, OMIs can be inserted at various sites in both jaws [4]. A meta-analysis of 52 studies on OMIs reported an overall failure rate of 13.5% [42]
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