Effect of different composite modulation protocols on the conversion and polymerization stress profile of bulk-filled resin restorations.
Effect of different composite modulation protocols on the conversion and polymerization stress profile of bulk-filled resin restorations.
复制标题
不同复合调制方案对整体填充树脂修复体的转化和聚合应力分布的影响。
DOI：
10.1016/j.dental.2020.03.019
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Pfeifer,CS
中科院分区：
文献类型：
--
作者：
Erhardt,MCG;Goulart,M;Jacques,RC;Rodrigues,JA;Pfeifer,CS
目的研究不同复合调制方案（预热、光固化时间和加入低聚物）对树脂聚合应力、牙髓内温度变化和转化率的影响。方法对48颗拔除的第三磨牙进行I类蛀牙（深度4mm ×直径5mm）的制备，分为6组。修复以单次增量完成，根据以下组：(1)Filtek Z250XT（室温-激活20 s）；(2) Filtek Z250XT（室温-激活40秒）；(3) Filtek Z250XT(68℃预热-激活20 s)；(4) Filtek Z250XT(68℃预热-激活40 s)；(5) Filtek BulkFill（室温激活20秒）；(6) Filtek Z250XT（通过添加硫氨基聚氨酯低聚物在室温下改性-活化40 s）。声发射测试作为实时聚合应力（PS）评估。用热电偶记录牙髓内温度变化，用拉曼光谱测量底/顶转换度（DC）。数据分析采用单因素方差分析/Tukey检验（α= 5%）。结果树脂复合材料预热对牙髓内温度无显著影响（p= 0.077）。由于较少的声事件，含硫脲基复合材料表现出明显较低的PS。预加热复合材料组的PS差异不显著，Filtek BulkFill和硫脲基实验复合材料的DC显著升高。意义树脂复合材料预热不能降低直接修复时的聚合应力。然而，在树脂复合材料中加入硫脲可以降低聚合应力，同时提高DC。
ObjectiveThe aim of thisin vitrostudy was to test the effect of different composite modulation protocols (pre-heating, light-curing time and oligomer addition) for bulk filling techniques on resin polymerization stress, intra-pulpal temperature change and degree of conversion.MethodsClass I cavities (4 mm depth × 5 mm diameter) were prepared in 48 extracted third molars and divided in 6 groups. Restorations were completed with a single increment, according to the following groups: (1) Filtek Z250XT (room temperature – activated for 20 s); (2) Filtek Z250XT (at room temperature – activated for 40 s); (3) Filtek Z250XT (pre-heated at 68 °C – activated for 20 s); (4) Filtek Z250XT (pre-heated at 68 °C – activated for 40 s); (5) Filtek BulkFill (at room temperature – activated for 20 s); (6) Filtek Z250XT (modified by the addition of a thio-urethane oligomer at room temperature – activated for 40 s). Acoustic emission test was used as a real-time polymerization stress (PS) assessment. The intra-pulpal temperature change was recorded with a thermocouple and bottom/top degree of conversion (DC) measured by Raman spectroscopy. Data were analyzed with one-way ANOVA/Tukey's test (α= 5%).ResultsPre-heating the resin composite did not influence the intra-pulpal temperature (p= 0.077). The thio-urethane-containing composite exhibited significantly less PS, due to a lower number of acoustic events. Groups with pre-heated composites did not result in significantly different PS. Filtek BulkFill and the thio-urethane experimental composite presented significantly higher DC.SignificanceResin composite pre-heating was not able to reduce polymerization stress in direct restorations. However, thio-urethane addition to a resin composite could reduce the polymerization stress while improving the DC.