Debris and friction of self-ligating and conventional orthodontic brackets after clinical use

To compare the degree of debris and friction of conventional and self-ligating orthodontic brackets before and after clinical use. Two sets of three conventional and self-ligating brackets were bonded from the first molar to the first premolar in eight individuals, for a total of 16 sets per type of...

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Bibliographic Details
Published in:The Angle orthodontist 2015-07, Vol.85 (4), p.673-677
Main Authors: Araújo, Raíssa Costa, Bichara, Lívia Monteiro, Araujo, Adriana Monteiro de, Normando, David
Format: Article
Language:English
Subjects:
Adult
Dental Alloys - chemistry
Dentistry
Female
Friction
Humans
Male
Original
Orthodontic Brackets - classification
Orthodontic Wires
Stainless Steel - chemistry
Stress, Mechanical
Surface Properties
Time Factors
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Summary:To compare the degree of debris and friction of conventional and self-ligating orthodontic brackets before and after clinical use. Two sets of three conventional and self-ligating brackets were bonded from the first molar to the first premolar in eight individuals, for a total of 16 sets per type of brackets. A passive segment of 0.019 × 0.025-inch stainless steel archwire was inserted into each group of brackets. Frictional force and debris level were evaluated as received and after 8 weeks of intraoral exposure. Two-way analysis of variance and Wilcoxon signed-rank test were applied at P < .05. After the intraoral exposure, there was a significant increase of debris accumulation in both systems of brackets (P < .05). However, the self-ligating brackets showed a higher amount of debris compared with the conventional brackets. The frictional force in conventional brackets was significantly higher when compared with self-ligating brackets before clinical use (P < .001). Clinical exposure for 8 weeks provided a significant increase of friction (P < .001) on both systems. In the self-ligating system, the mean of friction increase was 0.21 N (191%), while 0.52 N (47.2%) was observed for the conventional system. Self-ligating and conventional brackets, when exposed to the intraoral environment, showed a significant increase in frictional force during the sliding mechanics. Debris accumulation was higher for the self-ligating system.
ISSN:0003-3219
1945-7103
DOI:10.2319/012914-80.1