Murata Hiroshi, Toki Kazuhito, Hong Guang, Hamada Taizo
Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
J Prosthet Dent. 2002 Oct;88(4):409-14. doi: 10.1067/mpr.2002.128101.
Little is known about the influence of tissue conditioners on physical property alteration of denture base resins.
This study evaluated the influence of a variety of commercial tissue conditioners on alteration of viscoelastic properties of a heat-polymerized denture base acrylic resin.
Four tissue conditioners and 1 heat-polymerized denture base acrylic resin were used. In one experiment, acrylic resin specimens (1.0-mm thick) were immersed in the liquid component of tissue conditioners for 36 hours. In another experiment, tissue conditioners were applied to acrylic resin specimens (0.5-mm and 1.0-mm thick) in a 2-mm layer; the specimens then were immersed in distilled water for 1 week. Control specimens for both groups had no lining and were immersed in distilled water for 36 hours and 1 week, respectively. Dynamic viscoelastic properties of the acrylic resin specimens were measured at 37 degrees C with an automatic viscoelastometer. Tensile storage modulus (E'), tensile loss modulus (E"), and loss tangent (tan delta) were determined at 1 Hz. These parameters were compared with analysis of variance and the Dunnett test at a predetermined significance level of.05. All statistical comparisons were made with reference to the control group and not to each other.
Only the liquid of Hydro-Cast significantly reduced E' and increased tan delta of the acrylic resin (P<.05). Acrylic resin specimens 0.5-mm thick and lined with tissue conditioners tended to have lower E' and higher tan delta than the control. However, only Hydro-Cast and SR-Ivoseal significantly decreased E', and only Hydro-Cast raised tan delta of the acrylic resin (P<.05). No significant difference was found among the E" values. The tissue conditioners did not affect E', E", or tan delta of acrylic resin specimens 1.0-mm thick.
Within the limitations of this study, some tissue conditioners significantly plasticized the denture base acrylic resin 0.5-mm thick. However, when the acrylic resin was 1.0-mm thick, no plasticization by the tissue conditioners was noted.
关于组织调节剂对义齿基托树脂物理性能改变的影响，人们了解甚少。
本研究评估了多种市售组织调节剂对热聚合义齿基托丙烯酸树脂粘弹性性能改变的影响。
使用了四种组织调节剂和一种热聚合义齿基托丙烯酸树脂。在一个实验中，将丙烯酸树脂标本（1.0毫米厚）浸泡在组织调节剂的液体成分中36小时。在另一个实验中，将组织调节剂以2毫米的厚度涂覆在丙烯酸树脂标本（0.5毫米和1.0毫米厚）上；然后将标本浸泡在蒸馏水中1周。两组的对照标本均未进行衬层处理，分别浸泡在蒸馏水中36小时和1周。使用自动粘弹性仪在37摄氏度下测量丙烯酸树脂标本的动态粘弹性性能。在1赫兹下测定拉伸储能模量（E'）、拉伸损耗模量（E"）和损耗角正切（tanδ）。通过方差分析和Dunnett检验在预定的显著性水平0.05下对这些参数进行比较。所有统计比较均参照对照组进行，而非相互比较。
仅Hydro-Cast的液体显著降低了丙烯酸树脂的E'并增加了tanδ（P<0.05）。0.5毫米厚且衬有组织调节剂的丙烯酸树脂标本的E'往往低于对照组，tanδ则高于对照组。然而，只有Hydro-Cast和SR-Ivoseal显著降低了E'，且只有Hydro-Cast提高了丙烯酸树脂的tanδ（P<0.05）。E"值之间未发现显著差异。组织调节剂对1.0毫米厚的丙烯酸树脂标本的E'、E"或tanδ没有影响。
在本研究的局限性范围内，一些组织调节剂使0.5毫米厚的义齿基托丙烯酸树脂显著增塑。然而，当丙烯酸树脂为1.0毫米厚时，未观察到组织调节剂的增塑作用。
