期刊
ANGLE ORTHODONTIST
卷 86, 期 6, 页码 905-908出版社
E H ANGLE EDUCATION RESEARCH FOUNDATION, INC
DOI: 10.2319/021016-115.1
关键词
Microleakage; Flash-free; Adhesive; Thermal cycling
Objective: To compare microleakage under 3M Unitek's APC Flash-Free Adhesive Coated System bracket and the APC PLUS Adhesive Coated System bracket after thermal cycling. Materials and Methods: Forty freshly extracted human maxillary premolars were randomly divided into two groups and bonded with either a Flash-Free bracket or a PLUS bracket. After bonding, the samples were incubated in a water bath at 37 degrees C for 24 hours and thermocycled for 5000 cycles between 5 degrees C and 50 degrees C. All teeth were immersed in a 2% methylene blue solution for 24 hours, embedded in acrylic and sectioned in a buccolingual direction at approximately the center of the bracket. Microleakage was observed at the enamel-adhesive interface from the occlusal and gingival margins of the bracket base. Statistical analysis was conducted using the Mann-Whitney U-test. Results: The median microleakage was higher in the Flash-Free group, but the difference between the two groups was not statistically significant (P > .05). Conclusion: In a laboratory setting, there is no significant difference between the extent of microleakage under the APC Flash-Free Adhesive Coated System bracket and the APC PLUS Adhesive Coated System bracket after thermal cycling.
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