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3.6 Other Factors 29 To address the possibility that the cumulative LED treatment could influence the rate of OTM, a least square means analysis at arbitrary time points (Days 0, 20, 45, 60 and 80) was conducted (Figure 3.6). The average extraction space size at each extrapolated time point was similar and the extraction space sizes were noted to display similar reductions in size at each of the arbitrary time point. In addition, the rate of OTM for the LED-treated and control groups was not found to be statistically different at any of the time points (Day 20, p=0.2445; Day 45, p=0.1758; Day 60, p=0.1717; Day 80, p=0.1741). Other factors that were considered as possible influences on the rate of OTM were sex, age and orthodontic wire dimension. Repeated measures analysis using these did not demonstrate any significant influence or interactions of sex (p=0.0752), wire size (p=0.7427) or age (p=0.4117) on the rate of OTM in the two groups. 3.7 Summary of Findings The results indicate that the patients involved in this study were demographically similar in terms of age and that distribution of the side of LED application (left or right side) was balanced. The data indicates that the starting size of the extraction site was similar in the control and LED-treated sides. As well, there was no statistical difference in the change of extraction space size over time between both groups overall or at the first (T1) or second (2) recall periods. This finding was not altered by analyses that accounted for the effects of age, sex, wire size, cumulative LED received or possible temporal variations in OTM.PDF Image | Effect of LED Phototherapy on the Rate of Orthodontic Tooth Movement
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