Abstract
Objective: To analyze and compare the efficiency of the correction of mandibular crowding between two types of bracket systems. Material and method: According to the results of the power analysis for sample size calculation, 19 Angle Class I patients were included in the study and randomly divided into two groups: GI (n=10, mean age 19.68years, min 13.86, max 28.78, self-ligating brackets), and GII (n= 9, mean age 20.98years, min11.13, max 29.85, conventional preadjusted brackets). To carry out this study, the sequence of wires used was similar for both groups. Dental casts were made available at the start of the treatment (T1), after 180 days of leveling and alignment(T2), and at the completion of leveling (mean, 600 days, T3). The degree of crowding was measured by means of Little’s and Fleming’s irregularity indexes, by using a Mitutoyo digital caliper. Student’s t test and ANOVA were used to compare the efficiency of mandibular alignment between the two groups. Results: The results showed that in the initial alignment phase (after 180 days), no statistically significant difference was found between the groups. On the other hand, from phase T1 to T3, it was observed a statistically significant difference between the groups regarding the correction of mandibular crowding.
Highlights
The results showed that in the initial alignment phase, no statistically significant difference was found between the groups
From phase T1 to T3, it was observed a statistically significant difference between the groups regarding the correction of mandibular crowding
In the past few years, we have observed a proliferation of preadjusted brackets with self-ligating systems, in that they have been offered as an advantage in orthodontic clinical practice [1,2]
Summary
The results of the systematic error evaluations, made by the paired t test, and of the causal error evaluations, as measured by the Houston WJ [19] formula showed that intra examiner agreement was excellent. To verify the compatibility of both groups, Student’s t test was applied in the initial phase of the treatment, and a statistically significant difference was found for Fleming et al [10] and Little RM [17] indexes for lower crowding. In Fleming’s index, reduction was of 5.64 mm for group I and 3.9 mm for group II, in that no statistically significant difference was found in the efficiency of the lower alignment during this phase. These results were similar to those found by other researchers [10,24,25]. It must be emphasized that research works with a longer follow-up time may be required, in order to foster a correct use of self-ligating appliances, for the existing scientific evidence does not seem to support the idea that self-ligating bracket systems are effectively more efficient to correct lower arch dental crowding
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