Objectives. To investigate if reducing the light-curing time (while maintaining similar energy density) of resin-based surface sealants influences their erosion-preventive potential and mechanical stability after thermomechanical loading. Methods. Dentine samples were treated as follows: group 1—untreated, groups 2–4—Seal&Protect, groups 5–7—experimental sealer, and groups 8–10—Syntac Classic system. Groups 2, 5 and 8 were light-cured for 10 s (1000 mW/cm2), groups 3, 6 and 9 for 7 s (1400 mW/cm2), and groups 4, 7, and 10 for 3 s (3200 mW/cm2). After water storage (7 d), first measurement was performed to evaluate baseline permeability of the sealants. After a thermomechanical loading (5000 cycles, 50/5°C, 12000 brushing strokes) a second evaluation of permeability was conducted (measurement 2). Permeability was tested by storing the samples in HCl (pH 2.3; 24 h) and measuring the dentine calcium release by atomic absorption spectroscopy. Results. For the first and second measurements, no influence of light-exposure time on permeability was observed (ANOVA: P > 0.05). No significant difference in the stability of the respective sealants was observed when light-cured for different durations. Conclusion. Shortening the light-curing time, while maintaining energy density constant, has no influence on permeability and stability of the investigated sealants.
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机译：目标。要研究减少树脂基表面密封剂的光固化时间（同时保持相似的能量密度）是否会影响其在热机械载荷后的耐腐蚀潜力和机械稳定性。方法。牙本质样品的处理如下：第1组-未经处理，第2-4组-密封和保护，第5-7组-实验密封剂，第8-10组-Syntac Classic系统。第2、5和8组光固化10 s（1000 mW / cm 2 ），第3、6和9组光固化7 s（1400 mW / cm 2 ） ），然后将第4、7和10组持续3 s（3200 mW / cm 2 ）。储水（7 d）后，首先进行测量以评估密封胶的基线渗透率。在热机械载荷（5000次循环，50/5°C，12000次刷牙次数）之后，进行了第二次渗透率评估（测量2）。通过将样品储存在HCl（pH 2.3; 24 h）中并通过原子吸收光谱法测量牙本质钙的释放来测试渗透性。结果。对于第一次和第二次测量，未观察到曝光时间对磁导率的影响（ANOVA：P> 0.05）。当光固化不同持续时间时，在各个密封剂的稳定性上没有观察到显着差异。结论。缩短光固化时间，同时保持能量密度恒定，对所研究的密封胶的渗透性和稳定性没有影响。
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