Abstract
To: Editor, The Angle OrthodontistRe: Orthodontic treatment stability predictors: A retrospective longitudinal study. The Angle Orthodontist. 2016. Online EarlyI would like to congratulate the authors on publishing this interesting paper. It examined some of the factors related to stability of orthodontic treatment. I have two questions for the authors:1. The study showed an association between history of extractions and lack of midline stability. Using the space provided by extractions could be one of the effective methods to correct midline deviation. Sometimes we even perform asymmetric extraction to shift midline position. Since no details of the extractions or specific differences between the extraction and non-extraction cases were provided, can you provide insight into whether the extraction cases exhibited a higher incidence and/or greater severity of midline deviation before orthodontic treatment? Or perhaps extraction cases showed more improvement of midline position than the non-extraction cases? If this is true then do you think it might explain the negative association between extractions and midline stability?2. Different types of tooth movements may be needed or associated with the treatment of different dentoskeletal patterns or malocclusions. For example, mandibular incisors are often proclined during Class II treatment, and this could be unstable. However, the association between dentoskeletal patterns and treatment stability is not conclusive. The paper stated that ‘Angle Classification' of the subjects was extracted from the clinical history but results concerning Angle classification were not reported in the Results and Discussion sections. Can you share any specific information regarding the association between pretreatment Angle classification and stability in your study?Thank you for conducting this important investigation that raises interesting questions to discuss.
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