Abstract
We read the study “Apical root resorption due to mandibular first molar mesialization: a split-mouth study” by Winkler et al1Winkler J. Göllner N. Göllner P. Pazera P. Gkantidis N. Apical root resorption due to mandibular first molar mesialization: a split-mouth study.Am J Orthod Dentofacial Orthop. 2017; 151: 708-717Abstract Full Text Full Text PDF PubMed Scopus (11) Google Scholar in the April 2017 issue of the AJO-DO. Mandibular molar mesialization is a difficult process because of the cortical nature of mandibular bone and the wide buccolingual roots of the mandibular molars.2Roberts W.E. Bone physiology, metabolism, and biomechanics in orthodontic practice.in: Graber T.M. Vanarsdall Jr., R.L. Orthodontics: current principles and techniques. Mosby, St Louis1994: 193-257Google Scholar The split-mouth design mentioned by the authors was appropriate, since it nullifies various limiting factors such as the patient's overall periodontal health and the clinician's skill. As mentioned in the Discussion, orthodontic treatment improves the long-term prognosis of mesially inclined posterior teeth with appropriate biomechanics and no periodontal inflammation.3Kim S.J. Sung E.H. Kim J.W. Baik H.S. Lee K.J. Mandibular molar protraction as an alternative treatment for edentulous spaces: focus on changes in root length and alveolar bone height.J Am Dent Assoc. 2015; 146: 820-829Abstract Full Text Full Text PDF PubMed Scopus (12) Google Scholar, 4Gkantidis N. Christou P. Topouzelis N. The orthodontic periodontic interrelationship in integrated treatment challenges: a systematic review.J Oral Rehabil. 2010; 37: 377-390Crossref PubMed Scopus (115) Google Scholar However, as an addition, a record of measuring the pretreatment inclinations of the molars on orthopantograms and a comparison with their posttreatment positions could have given a better idea about the EARR associated with mesialization of molars. Clarification will be highly appreciated. Apical root resorption due to mandibular first molar mesialization: A split-mouth studyAmerican Journal of Orthodontics and Dentofacial OrthopedicsVol. 151Issue 4PreviewOur aim was to evaluate the risk of external apical root resorption (EARR) in mesialized mandibular molars due to space closure in patients with unilateral second premolar agenesis. The contralateral side served as the control. Full-Text PDF
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