Background: The commonly used models to evaluate orthodontic tooth movement(OTM)in humans are canine retraction, lower anterior de-crowding, premolar buccal/apical movement, incisor apical movement, en-mass retraction, mesial/distal movement of molars and dental expansion. In therapeutic extraction cases, closure of first premolar space is a major step; hence earlier researchers have focused their attention on canine retraction to evaluate OTM. Objective: Studying OTM by considering as much as possible key factors that might have an effect on OTM is important and hence this review aimed to discuss whether the well-studied confounding variables had been considered when evaluating tooth movement in canine retraction studies. Method-Data source: Literature search had been carried out in the PubMed and Cochrane central library database using an appropriate search strategy together with hand searching. Study selection: A total of 47 articles were scrutinized from 418 clinical trials that met the stringent inclusion and exclusion criteria. Data extraction: Two authors independently extracted the data from each article with a pre-defined data field and the extracted data was finalized by the third author. Results: There is a presence of heterogeneity among the studies. Few studies have given adequate attention to well-studied confounding variables. Conclusion: The present review reveals that the factors that influence the tooth movement are vast and hence the outcomes of these studies should be viewed cautiously.
Key words: Confounding factors, OTM, Canine retraction.
Received: 16 September 2018 Revised: 22 September 2018 Accepted: 2 November 2018
Corresponding author: Dr. S. Lalithapriya M.D.S., Ph.D Research scholar, Department of Orthodontics & Dentofacial Orthopaedics, Rajah Muthiah Dental College & Hospital, Annamalai University, Chidambaram, Tamil nadu, India Pin-608002
This article may be cited as: Lalithapriya S, Rajasigamani K, Bhaskar V. Whether adequate attention given to confounding factors affecting tooth movement in canine retraction studies? - A literature review with systematic criteria. J Adv Med Dent Scie Res 2018;6(11):51-61.