Centre for Oral Bioengineering (Dental Physical Sciences Unit), Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, UK; School of Dentistry (SOD), Federal Medical Teaching Institution (FMTI)/PIMS, Shaheed Zulfiqar Ali Bhutto Medical University (SZABMU), Islamabad, Pakistan.
Centre for Oral Bioengineering (Dental Physical Sciences Unit), Bart's and The London School of Medicine and Dentistry, Queen Mary University of London, UK.
Dent Mater. 2021 Jun;37(6):1054-1065. doi: 10.1016/j.dental.2021.03.019. Epub 2021 Apr 19.
To study the effects of incorporating a further crosslinking agent and a novel surfactant on the water absorption behaviour of experimental VPS impression materials.
Part 1: The water uptake behaviour of Aquasil-Ultra-Monophase (AqM) was studied gravimetrically in three media (DW, 1%NaOCl and Perform ID), at 23 °C and 37 °C, over a period of one and four-months (n = 5) to gain information on long-term immersion. Part 2: Five experimental materials were formulated: Exp-I and II as hydrophobic and Exp-III-V as hydrophilic, containing an additional cross-linking agent (TFDMSOS) and Rhodasurf CET-2 surfactant. Their water uptake and desorption (both at 23 °C) properties (gravemetrically), solubility, pH and diffusion coefficient (DC) data were compared with three commercial, hydrophilic VPS impression materials, over seven days (n = 5). The results were analysed statistically.
Part 1: Significant differences in water absorbed by AqM were observed in the three media at 23 °C. Aq M had a significantly higher uptake in 2% Perform ID, than in DW and NaOCl. At 37 °C, over four-months the uptake profiles were more enhanced and differed. Part 2: All Exp and commercial materials significantly increased in weight in both media (DW and 1% NaOCl at 23 °C), with differing uptake profiles and non-reached equilibrium. Exp-VPS absorbed significantly less water than commercial-VPS. Desorption of all VPS from both parts was faster than absorption, followed Fickian diffusion kinetics and reached equilibrium within 1-3 days. Desorption DCs for Exp-VPS were higher than commercial materials (10 versus 10 m s). The solubility was higher in 1% NaOCl compared to DW. The pH of DW after immersion of samples significantly increased compared to 1% NaOCl.
The incorporation of novel cross-linking agent, TFDMSOS and non-ionic surfactant, Rhodasurf CET-2, (ethoxylated-cetyl-oleyl alcohol) improved the dimensional stability of hydrophilic Exp-VPS in DW and 1% NaOCl. These materials merit further research in producing accurate casts of the patient's anatomy following disinfection.
研究进一步交联剂和新型表面活性剂对实验性 VPS 印模材料吸水行为的影响。
第 1 部分：通过重量法在 3 种介质（DW、1%NaOCl 和 Perform ID）中，在 23°C 和 37°C 下，对 Aquasil-Ultra-Monophase（AqM）的吸水率进行研究，在一个月和四个月的时间内（n=5），以获得长期浸泡的信息。第 2 部分：配制了 5 种实验材料：Exp-I 和 Exp-II 为疏水性，Exp-III-V 为亲水性，均含有额外的交联剂（TFDMSOS）和 Rhodasurf CET-2 表面活性剂。在 7 天内（n=5），通过重量法比较了它们的吸水率和脱吸（均在 23°C）、溶解度、pH 值和扩散系数（DC）数据，与 3 种商业亲水 VPS 印模材料进行比较。对结果进行了统计学分析。
第 1 部分：在 23°C 下，AqM 在三种介质中的吸水率存在显著差异。AqM 在 2%Perform ID 中的吸收量显著高于 DW 和 NaOCl。在 37°C 下，四个月后，吸收曲线更加明显不同。第 2 部分：在 23°C 的两种介质（DW 和 1%NaOCl）中，所有 Exp 和商业材料的重量均显著增加，吸收曲线不同，未达到平衡。Exp-VPS 的吸水率明显低于商业-VPS。所有 VPS 的解吸速度均快于吸收，随后遵循菲克扩散动力学，在 1-3 天内达到平衡。Exp-VPS 的解吸 DC 高于商业材料（10 对 10 m s）。在 1%NaOCl 中的溶解度高于 DW。与 1%NaOCl 相比，DW 浸泡样品后的 pH 值显著升高。
新型交联剂 TFDMSOS 和非离子表面活性剂 Rhodasurf CET-2 的加入提高了亲水性 Exp-VPS 在 DW 和 1%NaOCl 中的尺寸稳定性。这些材料在经过消毒后，为生产患者解剖结构的精确印模提供了进一步的研究价值。
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