研究目的
Investigating the effect of a modified photoactivation protocol using two simultaneous light-curing units on the shear bond strength (SBS) of brackets to enamel.
研究成果
Simultaneous photoactivation of the orthodontic cement using two light-curing units, one positioned at each proximal face of the bracket, yielded similar bonding ability compared to the conventional light-curing method. Photoactivation of the orthodontic cement at one proximal face of the bracket only is not recommended, irrespective of the light-curing time used.
研究不足
The study did not investigate the long-term effects of the photoactivation protocols beyond 1000 thermal cycles. The use of bovine teeth instead of human teeth may also limit the direct applicability of the findings to clinical settings.
1：Experimental Design and Method Selection:
A complete randomized and blinded 4×2 factorial study design was used to test four photoactivation protocols of the orthodontic cement on bovine incisors.
2：Sample Selection and Data Sources:
120 bovine permanent incisors were used, with their roots embedded in PVC tubes for the crown buccal face to be in a perpendicular position to the horizontal level.
3：List of Experimental Equipment and Materials:
Stainless steel Edgewise metallic brackets, resin-based orthodontic cement Transbond XT, LED curing unit (Radii Cal; SDI), calibrated power meter (Ophir Optronics), mechanical testing machine (DL500; EMIC).
4：Experimental Procedures and Operational Workflow:
After cleaning and acid-etching the teeth surfaces, brackets were bonded using the orthodontic cement and subjected to one of four photoactivation protocols. SBS was tested immediately or after 1000 thermal cycles.
5：Data Analysis Methods:
Data were subjected to two-way ANOVA and Student-Newman-Keuls’ test (α=0.05).
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