Donát Szebeni , Roland Told , Sándor Kunsági-Máté , József Szalma , Péter Maróti , Katalin Böddi , Edina Lempel
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SS was measured from the start of polymerization to 5 min using a Materials Testing Machine. The radiant exitance of LCUs was measured using a spectrophotometer. ANOVA and Tukey's post-hoc test, multivariate analysis and partial eta-squared statistics were used to analyze the data (p < 0.05).</p></div><div><h3>Results</h3><p>AFCT-modification significantly decreased ME (p < 0.001). ME was reduced by half by day 10 and by one tenth by the end of the 14-day compared to the 3-day sampling. ME itself was dependent, whereas the percentage of monomers released was independent of the PP used (p > 0.05). FOB showed the lowest SS (p < 0.001), while there was no significant difference between TPF and TEC (p = 0.124). Both ME and SS were significantly influenced by material type and PP.</p></div><div><h3>Significance</h3><p>The incorporation of the AFCT monomer reduced ME, but this was inversely related to a decrease in exposure time. 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引用次数: 0
摘要
研究目的目的是比较单片和多片 LED 固化单元（LCU）的快速（3 秒）和常规（20 秒）聚合方案（PP）对含和不含加成-断裂链转移（AFCT）单体的块状填充树脂基复合材料（RBC）的收缩应力（SS）和单体洗脱（ME）的影响：用两种含不同 AFCT 单体的 RBC（Filtek OneBulk-FOB；Tetric PowerFill-TPF）和一种不含 AFCT 单体的 RBC（Tetric EvoCeram Bulk-TEC）制备圆柱形（5x4 毫米）试样。浸泡 3 天、10 天和 14 天（75% 乙醇）后，使用标准单体通过高效液相色谱法对 ME 进行量化。使用材料试验机测量了从聚合开始到 5 分钟的 SS 值。使用分光光度计测量 LCU 的辐射出射率。采用方差分析、Tukey 后检验、多元分析和部分等方统计来分析数据（p 结果：AFCT 改性明显降低了 ME（p 0.05）。FOB 显示出最低的 SS（p 显著性：AFCT 单体的加入降低了 ME 值，但这与暴露时间的缩短成反比。随着 ME 值的增加，SS 值也随 PP 值的快速增加而降低。将 AFCT 分子与适当的树脂、引发剂系统结合使用，对聚合动力学和单体融入网络具有重要意义。
Monomer elution and shrinkage stress analysis of addition-fragmentation chain-transfer-modified resin composites in relation to the curing protocol
Objective
The purpose was to compare the effects of rapid (3 s) and conventional (20 s) polymerization protocols (PP) of mono- and multichip LED curing units (LCU) on shrinkage stress (SS) and monomer elution (ME) in bulk-fill resin-based composites (RBC) with and without addition-fragmentation chain-transfer (AFCT) monomer.
Methods
Cylindrical (5x4mm) specimens were prepared from two RBCs containing different AFCT monomers (Filtek OneBulk-FOB; Tetric PowerFill-TPF) and one without (Tetric EvoCeram Bulk-TEC). After soaking for 3, 10, and 14 days (75 % ethanol), ME was quantified using standard monomers by High-Performance Liquid Chromatography. SS was measured from the start of polymerization to 5 min using a Materials Testing Machine. The radiant exitance of LCUs was measured using a spectrophotometer. ANOVA and Tukey's post-hoc test, multivariate analysis and partial eta-squared statistics were used to analyze the data (p < 0.05).
Results
AFCT-modification significantly decreased ME (p < 0.001). ME was reduced by half by day 10 and by one tenth by the end of the 14-day compared to the 3-day sampling. ME itself was dependent, whereas the percentage of monomers released was independent of the PP used (p > 0.05). FOB showed the lowest SS (p < 0.001), while there was no significant difference between TPF and TEC (p = 0.124). Both ME and SS were significantly influenced by material type and PP.
Significance
The incorporation of the AFCT monomer reduced ME, but this was inversely related to a decrease in exposure time. SS values reduced by rapid PP in parallel with increasing ME values. The utilization of the AFCT molecule in conjunction with an appropriate resin-, initiator-system is of significant consequence for the kinetics of polymerization and the incorporation of monomers into the network.
期刊介绍：
Dental Materials publishes original research, review articles, and short communications.
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The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology.
Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.
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