Delgado A J, Amaya-Pajares S P, Su Y, Behar-Horenstein L, Donovan T E
University of Florida.
Oregon Health & Science University.
Eur J Prosthodont Restor Dent. 2018 Mar 1;26(1):40-45. doi: 10.1922/EJPRD_01755Delgado06.
The purpose of this study was to assess the gelation and polymerization time of three polyvinyl siloxane (PVS) putty materials and to determine if those times were affected by nitrile gloves under different conditions.
Ten specimens (n=10) were obtained for each PVS putty material (Express STD, 3M ESPE; Extrude Xtra, Kerr and Exafast, GC) and tested under different conditions (gloves washed, gloves unwashed and hands contaminated). The gelation and polymerization time were measured using an oscillating rheometer and recorded for 400 s at 37°C to simulate the oral environment.
The mean gelation time of hand contaminated specimens was 157.50 minutes and was significantly slower than that by using nitrile washed gloves (mean=117.94, p=.004) and by using unwashed gloves (mean=99.46, p⟨0.001). Unwashed gloves had significantly quicker gelation times compared to washed gloves (p=.046). The gelation time was significantly delayed with Exafast compared to Extrude Xtra and Express STD across all the different types of glove conditions (p⟨0.043). No significant differences were observed between polymerization time with Exafast and Extrude Xtra Putty.
Extrude Xtra putty material had significantly better performance than GC Exafast and Express. Hand contaminated specimens were affected by the gelation/polymerization time.
本研究旨在评估三种聚乙烯基硅氧烷（PVS）油灰材料的凝胶化和聚合时间，并确定在不同条件下腈手套是否会影响这些时间。
每种PVS油灰材料（Express STD，3M ESPE；Extrude Xtra，Kerr；Exafast，GC）获取10个样本（n = 10），并在不同条件下（手套清洗、手套未清洗和手部污染）进行测试。使用振荡流变仪测量凝胶化和聚合时间，并在37°C下记录400秒以模拟口腔环境。
手部污染样本的平均凝胶化时间为157.50分钟，明显慢于使用清洗过的腈手套（平均 = 117.94，p = 0.004）和未清洗手套（平均 = 99.46，p＜0.001）的情况。与清洗过的手套相比，未清洗手套的凝胶化时间明显更快（p = 0.046）。在所有不同类型的手套条件下，与Extrude Xtra和Express STD相比，Exafast的凝胶化时间明显延迟（p＜0.043）。Exafast和Extrude Xtra油灰的聚合时间之间未观察到显著差异。
Extrude Xtra油灰材料的性能明显优于GC Exafast和Express。手部污染样本受凝胶化/聚合时间的影响。
