Effect of High-Power LED Barriers on Shear Bond Strength and Curing Time in Orthodontic Brackets With Single-Component Adhesive

IF 2.2 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical and Experimental Dental Research Pub Date : 2025-06-11 DOI:10.1002/cre2.70153

Yasaman Bozorgnia, Mahla Tak, Maryam Jamali

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Abstract

Objective

The dental light-curing unit is a crucial component in bonding brackets. Since it cannot be steam-sterilized, it is covered with a disposable barrier and disinfected between patients. This study examined the impact of the cellophane layer used to cover the light guides on both the shear bond strength and the adhesive remnant index.

Material and Methods

Fifty human premolars, extracted for clinical purposes, were randomly allocated into five groups. Three of these groups were cured using a high-power LED unit with a cellophane layer, applying curing times of 3, 6, and 9 s. The remaining two groups were cured for 3 and 6 s without a cellophane layer. The bracket shear bond strengths were assessed utilizing a universal testing machine. The collected data underwent analysis through a one-way analysis of variance (ANOVA), followed by Tukey's post hoc test.

Results

The group with the highest shear bond strength was group 5 (6 s of light curing without a cellophane layer), while group 1 (3 s of light curing with a cellophane layer) had the lowest shear bond strength. Significant statistical differences were identified among the groups (p < 0.05). Moreover, no notable differences were observed concerning the adhesive remnant index.

Conclusion

The cellophane layer decreased the shear bond strength. Therefore, to achieve clinically accepted values, at least 9 s of radiation is necessary when using cellophane.

Abstract Image

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大功率LED阻隔剂对单组分胶粘剂正畸托槽剪切粘结强度和固化时间的影响

目的牙体光固化装置是粘接托槽的关键部件。由于它不能蒸汽消毒，所以在病人之间用一次性屏障覆盖并消毒。本研究考察了用于覆盖导光板的玻璃纸层对剪切粘接强度和粘接残余指数的影响。材料与方法50颗临床用前磨牙随机分为5组。其中三组使用带有玻璃纸层的大功率LED单元进行固化，固化时间分别为3、6和9秒。其余两组分别固化3 s和6 s，不加盖玻璃纸层。利用万能试验机评估支架剪切粘结强度。收集到的数据通过单因素方差分析（ANOVA）进行分析，然后进行Tukey事后检验。结果5组（光固化无玻璃纸层6 s）剪切结合强度最高，1组（光固化有玻璃纸层3 s）剪切结合强度最低。各组间差异有统计学意义（p < 0.05）。胶粘剂残留指数无显著性差异。结论玻璃纸层降低了剪切强度。因此，为了达到临床可接受的值，使用玻璃纸时至少需要9秒的辐射。

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来源期刊

Clinical and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.30

自引率

5.60%

发文量

165

审稿时长

26 weeks

期刊介绍： Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.