Ferreira Amanda, Aras Meena, Chitre Vidya, Coutinho Ivy, Rajagopal Praveen
Department of Prosthodontics and Crown & Bridge, Goa Dental College and Hospital, Bambolim, Goa, India.
J Indian Prosthodont Soc. 2018 Oct-Dec;18(4):305-313. doi: 10.4103/jips.jips_197_18.
The purpose of this study was to assess and compare the effect of the simulated Indian and Mediterranean climates on the Shore A hardness of a commercially available nonpigmented room temperature vulcanizing maxillofacial silicone.
Sixty specimens were fabricated from A-2000 silicone material (Factor II), using a stainless steel mold of dimension 20 mm × 2 mm. The initial Shore A hardness was noted using a digital durometer. Thirty samples were subjected to the simulated Mediterranean climate (Group I), and the remaining thirty samples were subjected to the Indian tropical climate (Group II) in an accelerated weather chamber to simulate 1 year of clinical use. Final Shore A hardness was noted. A one-way ANOVA and Bonferroni tests were performed for the Shore A hardness at < 0.05.
The mean initial Shore A hardness for both the groups was 24.9833. After accelerated weathering, Group I showed mean Shore A hardness of 33.0000 whereas Group II showed mean Shore A hardness of 38.0000.
The Shore A hardness of Factor II, before and after accelerated artificial weathering, was statistically significant at 0.05 level ( < 0.05). The change in Shore A hardness was greater in the simulated tropical climate group (Group II) as compared to the simulated Mediterranean climate group (Group I) but within clinical limits.
本研究旨在评估和比较模拟的印度和地中海气候对市售非色素室温硫化颌面硅橡胶邵氏A硬度的影响。
使用尺寸为20mm×2mm的不锈钢模具，由A - 2000硅橡胶材料（Factor II）制作60个样本。使用数字硬度计记录初始邵氏A硬度。30个样本置于模拟地中海气候环境中（第一组），其余30个样本置于模拟印度热带气候环境中（第二组），在加速老化试验箱中模拟1年临床使用情况。记录最终邵氏A硬度。对邵氏A硬度进行单因素方差分析和Bonferroni检验，显著性水平设定为<0.05。
两组的初始邵氏A硬度平均值均为24.9833。加速老化后，第一组的邵氏A硬度平均值为33.0000，而第二组为38.0000。
加速人工老化前后，Factor II的邵氏A硬度在0.05水平具有统计学显著性（<0.05）。与模拟地中海气候组（第一组）相比，模拟热带气候组（第二组）的邵氏A硬度变化更大，但在临床限度内。
