The effect of occlusogingival placement of clinical bracket points on the adaptation of a straight wire to the lingual arch form

Abstract

ObjectiveThe aim of this study is to compare the adaptation of a straight wire between brackets positioned at the mid-lingual surface and those placed gingivally by using a three-dimensional simulation software.MethodsThis cross-sectional study was performed using OrthoAid, an in-house software. The subjects were 36 adolescents with normal Class I occlusion. For each dental cast, two bracket positioning approaches, namely the middle and gingival, were examined. In the middle group, the reference points were placed on the mid-lingual surface of each tooth, while in the gingival group, the reference points were positioned lingually on the anterior teeth. A 4th degree polynomial was adopted, and the in-plane and off-plane root mean squares (RMSs) of the distances between the reference points and the fitted polynomial curve were calculated using the software. Statistical analysis was performed using the paired-samples t-test (α = 0.05).ResultsThe mean in-plane RMS of the polynomial curve to the bracket distance in the gingival group was significantly lower than that in the middle group (p < 0.001). The off-plane RMS was higher in the gingivally positioned brackets in the maxilla than in the middle group (p < 0.001). However, the off-plane RMS in mandible was not statistically significantly different between the two groups (p = 0.274).ConclusionsThe results demonstrated that the gingival placement of lingual brackets on the anterior teeth could decrease the distance between a tooth and the straight wire.

Agreement of the clinician's choice of archwire selection on conventional and virtual models

“…The scans were transferred to OrthoAid, a computer software application that was developed for orthodontics and used in previous studies. 22 The interexaminer and intraexaminer reliability of archwire selection using OrthoAid computer software were calculated to be .991 and .995, respectively, 9 which indicated excellent reliability.…”