Mini-screw implant or transpalatal arch-mediated anchorage reinforcement during canine retraction: A randomized clinical trial

• Localización: Journal of orthodontics, ISSN-e 0301-228X, ISSN 1465-3125, Nº. 2-39, 2012, págs. 102-110
• Idioma: inglés
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• Resumen

  • Objective: To compare mesial movement of upper first molars during maxillary canine retraction using a pre-adjusted edgewise appliance provided by anchorage reinforcement and a transpalatal arch or mini-screw implant.

    Design: Randomized clinical trial.

    Setting: Department of Orthodontics and Dentofacial Orthopedics, Armed Forces Medical College, Pune, India.

    Subjects and methods: From a cohort of subjects requiring the extraction of both upper first premolars and pre-adjusted edgewise appliances to correct their malocclusion, a total of 30 were randomly allocated to receive two different forms of anchorage reinforcement: Group A � receiving mini-screw implant and Group B � receiving a transpalatal arch Group A subjects received titanium mini-screw implants placed at the start of treatment between the maxillary second premolar and maxillary first molar. Maxillary second premolars were secured to the mini-screw implants using of 0·010-inch stainless steel ligature wire. Group B subjects received a custom-made transpalatal arch which was soldered to maxillary first molar bands. Active canine retraction was initiated in both groups on placement of a 0·019×0·025-inch stainless steel archwire using nickel titanium closed coil springs.

    Outcome measures: Mesial movement of the upper first molars as measured on pre- (T1) and post-treatment (T2) lateral skull radiographs.

    Results: The results showed that in Group A the mean mesial movement of the first molars between T1 and T2 was 0·0 mm (SD 0·02; P?=?0·90), whereas in Group B there was a mean forward movement of the first maolars of 2·48 mm (SD 0·71; P<0·001).

    Conclusion: In this trial, mini-screw implants placed prior to levelling and aligning were able to provide absolute anchorage during maxillary canine retraction, in contrast to a transpalatal arch.