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Chapter 4: DISCUSSION This study investigated whether extra-orally derived, transdermal IR- LED phototherapy applied during extraction space closure was able to increase the rate of OTM. It showed that there was no statistical difference in the rate of OTM over a 3 month period of bilaterally symmetrical extraction space closure. A discussion of the design employed in the study and the possible reasons for the finding of a lack of effect of IR-LED on OTM and future directions will be conducted in the following subsections. 4.1 The Evaluation of Orthodontic Tooth Movement: Extraction Space Closure versus Changes in Overall Occlusion. In evaluating the rate of tooth movement, studies can be categorized as quantitative if they measure the rate of tooth movement directly or qualitative if they report on treatment progression via improvements in the degree of malocclusion. This study focused on a quantitative measure of the rate of movement of specific teeth. In contrast to the chosen mode of evaluating tooth movement, indices of malocclusion are sometimes used to categorize patients and assess treatment progress. However, indices of malocclusion often involve several variables that contribute in varying degrees to the malocclusion index rating. For example, some indices such as the IOTN (Index of Orthodontic Treatment Need) emphasize factors such as esthetics (Borzabadi-Farahani et al., 2012; Lima et al., 2010; Manzanera et al., 2010). Although important in a successful treatment outcome, these 34PDF Image | Effect of LED Phototherapy on the Rate of Orthodontic Tooth Movement
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