Department of Preventive, Restorative and Paediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010 Bern, Switzerland.
Clin Oral Investig. 2012 Apr;16(2):469-79. doi: 10.1007/s00784-011-0522-2. Epub 2011 Feb 18.
The aim of our study is to evaluate the performance of surface sealants and conventional polishing after ageing procedures. Eighty circular composite restorations were performed on extracted human molars. After standardised roughening, the restorations were either sealed with one of three surface sealants (Lasting Touch (LT), BisCover LV (BC), G-Coat Plus (GP) or a dentin adhesive Heliobond (HB)) or were manually polished with silicon polishers (MP) (n = 16). The average roughness (Ra) and colourimetric parameters (CP) (Lab*) were evaluated. The specimens underwent an artificial ageing process by thermocycling, staining (coffee) and abrasive (toothbrushing) procedures. After each ageing step, Ra and CP measurements were repeated. A qualitative surface analysis was performed with SEM. The differences between the test groups regarding Ra and CP values were analysed with nonparametric ANOVA analysis (α = 0.05). The lowest Ra values were achieved with HB. BC and GP resulted in Ra values below 0.2 μm (clinically relevant threshold), whereas LT and MP sometimes led to higher Ra values. LT showed a significantly higher discolouration after the first coffee staining, but this was normalised to the other groups after toothbrushing. The differences between the measurements and test groups for Ra and CP were statistically significant. However, the final colour difference showed no statistical difference among the five groups. SEM evaluation showed clear alterations after ageing in all coating groups. Surface sealants and dentin adhesives have the potential to reduce surface roughness but tend to debond over time. Surface sealants can only be recommended for polishing provisional restorations.
我们的研究目的是评估表面密封剂和传统抛光在老化程序后的性能。在从人磨牙中提取的 80 个圆形复合修复体上进行了实验。在标准化粗糙化后，修复体用三种表面密封剂（持久触摸（LT）、BisCover LV（BC）、G-Coat Plus（GP）或牙本质粘合剂 Heliobond（HB）中的一种进行密封）或用硅抛光剂（MP）（n = 16）进行手动抛光。评估了平均粗糙度（Ra）和比色参数（CP）（Lab*）。将标本通过热循环、染色（咖啡）和研磨（刷牙）程序进行人工老化处理。每次老化后，重复 Ra 和 CP 测量。使用 SEM 进行定性表面分析。用非参数 ANOVA 分析（α = 0.05）分析测试组之间 Ra 和 CP 值的差异。HB 获得的 Ra 值最低。BC 和 GP 的 Ra 值低于 0.2μm（临床相关阈值），而 LT 和 MP 有时会导致更高的 Ra 值。LT 在第一次咖啡染色后显示出明显更高的变色，但在刷牙后恢复到其他组的正常水平。Ra 和 CP 的测量值和测试组之间的差异具有统计学意义。然而，最终的颜色差异在五个组之间没有统计学差异。SEM 评估显示，所有涂层组在老化后都有明显的变化。表面密封剂和牙本质粘合剂具有降低表面粗糙度的潜力，但随着时间的推移往往会脱粘。表面密封剂仅可推荐用于抛光临时修复体。
