EFFECT OF MINISCREWS PERFORATION ON MAXILLARY CANINE RETRACTION RATE
The aim of this study was to evaluate the rate of canine retraction in maxillary first premolar extraction patients with or without flapless cortical perforations (FCPs) made with the help of a miniscrew. 30 adult patients with class II div I malocclusion were randomly allocated with the help of SPSS software to either perforation or conventional group for carrying out this randomized parallel group controlled trial in 1:1 ratio. Maxillary first premolars were extracted and canine retractions were commenced in both groups. Three bilateral cortical FCP were made in the perforation group with a self-tapping miniscrew of 1.5mm diameter. The patients were evaluated at 28 days after start of canine retraction. Data were analyzed with the help of SPSS software with an intention-to-treat approach.
Mean canine retraction in patients with conventional mechanics was 0.49 ± 0.08 mm while patients with FCP had a mean retraction of 1.52±0.11 mm measured at the tips of the canine and lateral incisor after 28 days. There were no losses to follow up. FCPs are an effective method of accelerating the rate of canine retractions by 2-3 fold in the first month of tooth movement.