Zirak Mitra, Vojdani Mahroo, Mohammadi Sorour, Khaledi Amir-Alireza
Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Int Soc Prev Community Dent. 2019 Jan-Feb;9(1):40-46. doi: 10.4103/jispcd.JISPCD_296_18. Epub 2019 Feb 14.
Water sorption and water solubility adversely affect the mechanical properties and biocompatibility of the denture material. This study aimed to evaluate the water sorption and solubility of three direct hard reline acrylic resins and a heat-curing one after immersion in food-simulating agents.
This study was performed on four groups of samples ( = 10 per group). The samples were made of three direct hard reline acrylic resins (TDV Cold Liner Rebase, Tokuyama Rebase II Fast, GC Reline Hard) and a heat-curing one (Meliodent). Each group was divided into four subgroups ( = 10) to undergo 7-day immersion in distilled water, 75% ethanol/water, 0.02 N citric acid, and heptane. Water sorption and solubility were calculated according to Oysaed and Ruyter formula. The statistical analyses were done by using SPSS software (version 22). Kruskal-Wallis H Test and Dunn's test were used to detect any significant difference among the groups ( < 0.05).
The median range of water solubility and water sorption values were -0.87-4.92 and 3.75-27.25 μg/mm, respectively. The median solubility and sorption values of different resins differed significantly in the same solution ( < 0.05). Besides, immersion in different solutions caused significant differences in the median solubility and sorption values of each reline material ( < 0.05), except for Meliodent whose solubility was not significantly affected by different solutions ( = 0.16).
Water sorption and solubility values of the tested hard reline resins were within the range of International Standards Organization 1567:1999. Given the low sorption and solubility values, these hard reline materials can be safely used in clinical situations.
吸水性和水溶性会对义齿材料的机械性能和生物相容性产生不利影响。本研究旨在评估三种直接硬衬丙烯酸树脂和一种热固化丙烯酸树脂在浸泡于食品模拟剂后的吸水性和溶解性。
本研究对四组样本进行（每组n = 10）。样本由三种直接硬衬丙烯酸树脂（TDV Cold Liner Rebase、Tokuyama Rebase II Fast、GC Reline Hard）和一种热固化丙烯酸树脂（Meliodent）制成。每组再分为四个亚组（n = 10），分别在蒸馏水、75%乙醇/水、0.02 N柠檬酸和庚烷中浸泡7天。根据Oysaed和Ruyter公式计算吸水性和溶解性。使用SPSS软件（版本22）进行统计分析。采用Kruskal-Wallis H检验和Dunn检验来检测各组之间的任何显著差异（P < 0.05）。
水溶性和吸水性值的中位数范围分别为-0.87 - 4.92和3.75 - 27.25μg/mm²。在相同溶液中，不同树脂的溶解性和吸附性中位数存在显著差异（P < 0.05）。此外，除Meliodent的溶解性不受不同溶液显著影响（P = 0.16）外，浸泡于不同溶液会导致每种硬衬材料的溶解性和吸附性中位数出现显著差异（P < 0.05）。
所测试的硬衬树脂的吸水性和溶解性值在国际标准化组织1567:1999规定的范围内。鉴于其低吸附性和溶解性值，这些硬衬材料可安全用于临床情况。
