Mass retraction movement of the anterior upper teeth using orthodontic mini-implants as anchorage.
Summary of "Mass retraction movement of the anterior upper teeth using orthodontic mini-implants as anchorage."
Several studies have demonstrated the application of mini-implants in the orthodontic treatment as anchorage during the retraction movement of the anterior teeth.
This study was designed to evaluate the mass retraction movement of the anterior upper teeth using orthodontic mini-implants as anchorage. MATERIALS AND
Nine patients with class I malocclusion and Angle's class II, needing extractions of the upper first premolars, were enrolled in this case series. The retraction was performed using sliding mechanics and orthodontic anchorage on mini-implants. Measures were taken by initial and final cephalometric X-rays of the retraction movement to evaluate whether the mini-implants remained stationary and displacements of the incisors and the upper first premolars.
Out of 18 mini-implants, 8 mesialized (0.45 mm, average) and 3 extruded (0.14 mm, average). The upper incisors were retracted on the average of 4.21 mm, extruded 0.33 mm, and tipped 10.3°. There were no statistical significant modifications in the placement of the posterior teeth.
Although there was a very small displacement of the mini-implants, they still provided an adequate anchorage for the retraction of the anterior teeth, and there was no loss in the anchorage of the posterior teeth.
Pontifical Catholic University (PUC) Minas, Belo Horizonte, MG, Brazil.
This article was published in the following journal.
Name: Oral and maxillofacial surgery
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21274732
- DOI: http://dx.doi.org/10.1007/s10006-011-0260-2
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Medical and Biotech [MESH] Definitions
Orthodontic appliances, fixed or removable, used to maintain teeth in corrected positions during the period of functional adaptation following corrective treatment. These appliances are also used to maintain the positions of the teeth and jaws gained by orthodontic procedures. (From Zwemer, Boucher's Clinical Dental Terminology, 4th ed, p263)
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