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ePaper created 2014-11-23, 19:37:33 | version 1.30.01
08 I I C.E. article_ self-ligating systems thattheclipexertsontherectangularwireforeachof stepsNos.1,2and3.Thedataallowedtheresearcher to compare the mean scores between steps Nos. 1 and 3, after subjecting the clips to the force of 20 N for two hours in step No. 2 (Table 2). ThepurposeofstepNo.2wastosubmittheclipto a sustained effort, similar to what occurs in a com- plete orthodontic treatment. This made it possible to check the difference in the mechanical behavior of the clips between the initial and final stages. _Results ANOVA (analysis of variance) was utilized to provide statistical calculation, complemented by the Tukey test of multiple comparisons, with a signifi- cance level at 5 percent. Among the metallic interactive brackets, the In-Ovation R group showed the highest average, being significantly different than the other groups BioQuick and Empower (Table 3). _Discussion Higher levels of force represent a disadvantage from the traditional systems of brackets when the load applied directly to the crowns exceeds biologi- cal limits. It is important to emphasize that the force generated by the clip is not delivered to the teeth. The importance is related to a proper engagement of the archwire into the slot, putting together the characteristics of the prescription in straight wire appliances. It’s interesting to observe that it’s not just the initial force generated by the clip that’s relevant, but also how constant the force is maintained. Although some brands of interactive brackets showed initial forces apparently strong enough to maintain the archwire in position, they also showed that this strength is lost and dissipates over time, meaning the efficiency of an interactive bracket is related to the consistent power generated by the clip and not to the initial force provided by a brand new bracket. ortho1_2014 Table 4 Table 5 Table 4_ The difference between the averages of steps Nos. 1 and 3. Table 5_ The mean scores for steps Nos. 1 and 3 of the test for each group of brackets.