The objective of this study was to evaluate the frequency and severity of orthodontically induced external apical root resorption (OIEARR) on incisors following nonextraction treatment to correct mild to moderate Class II malocclusions.
From a total of 70 consecutively treated growing patients, 32 were treated with a Forsus appliance simultaneously to brackets (FG group) and 38 were treated with a Xbow appliance followed by brackets (XG group). All patients had at least end-to-end Class II molar relationship in either side, an OJ larger than 5 mm, and an ANB larger than 4°. Both groups used the same bracket prescription and archwire sequence. A repeated-measures multiple analysis of covariance was used to assess was chosen to determine if treatment approach had any bearing on the amount of OIEARR. Factors considered were degree of OIEARR, sex, age, and their interactions.
When comparing OIEARR between the FG and XG groups, of the teeth that experienced no resorption, 43.8% were treated with FG, whereas 56.2% were treated with XG. In teeth that experienced mild OIEARR, 41.7% were treated with FG, and 58.3% were treated with XG. In teeth that experienced moderate OIEARR, 67.3% were treated with FG, and 32.7% were treated with XG. Finally, in teeth with severe OIEARR, 42.9% were treated with FG, and 50.8% were treated with XG. There was no statistical difference noted in terms of OIEARR for patients treated with either treatment (P=0.412). Other factors had no bearing on the results.
Frequency and severity of incisor OIEARR were not different between the two treatment approaches.
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Accepted: July 31, 2015
Received in revised form: July 5, 2015
Received: May 11, 2015
All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.
Conflict of interests: None of the authors declare any potential conflict of interest, except Dr. Flores-Mir, who has lectured about the Xbow appliance worldwide.
© 2015 World Federation of Orthodontists. Published by Elsevier Inc. All rights reserved.