Ceramic brackets and low friction

Objectives: The aim of the present study was to evaluate the effects of 1.5 T and 3 T MRI on the adhesion between the orthodontic brackets and the teeth by evaluating the microleakage between the enamel, adhesive and brackets interfaces. Methods: 58 extracted human premolars which were received a standard bracket bonding procedure were randomly divided into three groups; control group (n = 20; no MRI), 1.5 T MRI group (n = 19; 20 min MRI exposure of 1.5 T) and 3 T MRI group (n = 19; 20 min MRI exposure of 3 T). The teeth were kept in distiled water for 2 weeks, and thereafter subjected to 500 thermal cycles. Then, specimens were sealed with nail varnish, stained with 0.5% basic fuchsin for 24 h, sectioned and photographed under a stereomicroscope. Microleakage was scored with regard to the adhesive–enamel and bracket–adhesive interfaces at the occlusal and gingival levels. Statistical analysis was accomplished by Kruskal–Wallis and Bonferroni–Dunn tests. Results: All of the groups exhibited statistically similar microleakage scores in the adhesive–enamel interface along occlusal margins (p>0.05, p = 0.331). The mean microleakage scores along gingival margins in the 3 T MRI group was significantly higher compared to the control group both in the adhesive–enamel and bracket–adhesive interfaces (p<0.05, p = 0.019 and p = 0.020 respectively). The microleakage scores along the gingival margins were also significantly higher than the occlusal margins in the 3 T MRI group (p<0.05, p = 0.029). Conclusions: 3 T MRI may weaken the adhesion between the enamel and the stainless steel orthodontic brackets.

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Comparison of the Sliding Resistance of Metallic, Composite and In-House 3D-Printed Brackets: An In Vitro Study

Brucculeri,

Pellitteri,

Palone

et al. 2024

Applied Sciences

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Objective: To evaluate the differences in frictional resistance between in-house 3D-printed resin brackets (IH3DBs) and two types of commercially available brackets in combination with three different archwires. Methods: Friction tests were performed using a dynamometer and a millimetre sled to simulate first premolar post-extraction space closure. Three different brackets, namely PRIMO metallic brackets, Crystal composite brackets and in-house 3D-printed brackets, were tested in combination with three different archwires (0.016-inch NiTi, 0.019 × 0.025-inch NiTi and 0.019 × 0.025-inch SS). Statistical analysis was performed to verify the differences in friction among the bracket and archwire combinations. For all the tests, the significance level was set at p < 0.05. Results: There were significant differences among the three brackets tested with both the 0.016-inch NiTi and 0.019 × 0.025-inch SS archwires (p = 0.026 and p = 0.017, respectively). Only tests with the 0.019 × 0.025-inch NiTi archwire yielded no statistically significant differences between the groups. The composite bracket generated clinically and statistically more friction than both the IH3DB and metallic bracket, with no differences between the latter two. Conclusions: The IH3DBs demonstrated comparable frictional resistance properties to the metal brackets and better than the composite brackets with all the archwires tested.

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Ceramic brackets and low friction

Abstract: Ceramic brackets with NCEL revealed frictional forces similar to those generated in conjunction with ceramic SLB, thereby helping to avoid metal artifacts in case of expected necessary MRI during orthodontic treatment with fixed appliances.

Cited by 3 publications

References 37 publications

Comparison of friction of metallic and ceramic brackets during sliding mechanics after prophylaxis with sodium bicarbonate jet: An in vitro study

Comparison of friction of metallic and ceramic brackets during sliding mechanics after prophylaxis with sodium bicarbonate jet: An in vitro study

Microleakage beneath orthodontic brackets in high field magnetic resonance imaging (MRI) AT 1.5 & 3 Tesla

Comparison of the Sliding Resistance of Metallic, Composite and In-House 3D-Printed Brackets: An In Vitro Study

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