Although EARR has occurred in all teeth evaluated, the bracket design (self-ligating or conventional) did not demonstrate any influence on the results observed.
ObjectiveTo compare the frictional resistance between self-ligating and conventional
brackets tied to different types of wire.Material and MethodsAbzil Kirium Capelozza (Pattern I) and Easy Clip (Roth prescription) incisor
brackets were used. An elastomeric ligature or a ligating wire 0.10-in was used to
ligate the wire to the Abzil bracket. Three types of orthodontic archwire alloys
were assessed: 0.016-in NiTi wire, 0.016 x 0.021-in NiTi wire and 0.019 x 0.025-in
steel wire. Ten observations were carried out for each bracket-archwire angulation
combination. Brackets were mounted in a special appliance, positioned at 90
degrees in relation to the wire and tested in two angulations. Frictional test was
performed in a Universal Testing Machine at 5 mm/min and 10 mm of displacement.
The means (MPa) were submitted to ANOVA and Tukey's test set at 5% of
significance. The surfaces of wires and brackets were observed at SEM.ResultsSteel-tied brackets (16.48 ± 8.31) showed higher means of frictional resistance
than elastomeric-tied brackets (4.29 ± 2.16 ) and self-ligating brackets (1.66 ±
1.57) (P < 0.05), which also differed from each other (P < 0.05). As for the
type of wire, 0.019 x 0.025-in steel wire (5.67 ± 3.97) showed lower means (P <
0.05) than 0.16-in NiTi wire (8.26 ± 10.92) and 0.016 x 0.021-in NiTi wire (8.51 ±
7.95), which did not differ from each other (P > 0.05). No statistical
differences (P > 0.05) were found between zero (7.76 ± 8.46) and five-degree
(7.19 ± 7.93) angulations.ConclusionsFriction was influenced not only by the type of bracket, but also by the ligating
systems. Different morphological aspects were observed for the brackets and wires
studied
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