Mass retraction movement of the anterior upper teeth using orthodontic mini-implants as anchorage.

Autor: de Lima Araújo LH; Pontifical Catholic University Minas, Belo Horizonte, MG, Brazil., Zenóbio EG, Pacheco W, Cosso MG, Manzi FR, Shibli JA
Jazyk: angličtina
Zdroj: Oral and maxillofacial surgery [Oral Maxillofac Surg] 2012 Mar; Vol. 16 (1), pp. 95-9. Date of Electronic Publication: 2011 Jan 28.
DOI: 10.1007/s10006-011-0260-2
Abstrakt: Background: Several studies have demonstrated the application of mini-implants in the orthodontic treatment as anchorage during the retraction movement of the anterior teeth.
Purpose: This study was designed to evaluate the mass retraction movement of the anterior upper teeth using orthodontic mini-implants as anchorage.
Materials and Methods: 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.
Results: 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.
Conclusions: 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.
Databáze: MEDLINE
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