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28 extraction space size from T0 to T1 and T1-T2 (Figure 3.4). In the case of the one exception in the LED group, there was a lack of tooth movement from T0 to T1 followed by a subsequent decrease in extraction space size during the second recall period. The exclusion of this data set did not affect the statistical significance of the comparison of controls versus LED-treated OTM rates. The resulting rates of OTM for the control and LED-treated (thick, hatched red and solid blue lines, respectively; Figure 3.4) groups were described using the following line equations: LED-treated Extraction space (in mm) = 5.227 - 0.042*days. Control Extraction space (in mm) = 5.004 - 0.039*days. These equations indicate that the average starting extraction space size of both groups was similar, with 5.227mm for the LED-treated side compared with 5.004mm for the control side. Also, both groups were found to have no statistically significant difference in average OTM rates with 0.042mm/d and 0.039mm/d for the LED-treated side and control sides, respectively (p=0.5066). In other words, accounting for the variation in orthodontic appointment interval length of each patient corresponded with the finding of no difference in the rate of OTM (slope of the line in Figure 3.4) between the LED treated and control sides. Further statistical analysis was conducted to test if there were any changes in the size of the extraction space over time between the two groups which could be better described with a quadratic modeled repeated measures analysis. In a similar manner to the linear model, this analysis compared the individual change in extraction space over time of the LED-treated and control sides of each patient and revealed no significant differences (p=0.4362, Figure 3.5).PDF Image | Effect of LED Phototherapy on the Rate of Orthodontic Tooth Movement
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