Goiato Marcelo Coelho, Pesqueira Aldiéris Alves, Santos Daniela Micheline dos, Dekon Stefan Fiúza de Carvalho
Department of Dental Materials and Prosthesis, School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil.
Braz Oral Res. 2009 Jan-Mar;23(1):49-53. doi: 10.1590/s1806-83242009000100009.
The purpose of this study was to evaluate the Shore A hardness and surface roughness of two silicones for maxillofacial prosthetic treatment, under the influence of chemical disinfection and storage. Twenty-eight specimens were obtained, half of which were made of Silastic MDX 4-4210 silicone and, the other half were made of Silastic 732 RTV silicone. The specimens were divided into four groups: Silastic 732 RTV and MDX 4-4210 with disinfection 3 times a week with Efferdent tablets and the same materials without disinfection. The hardness of the materials was analyzed with a Shore A Durometer. The surface roughness was established by a digital portable roughness tester, initially and 2 months after the confection of the specimens. A variance test was applied (2-way ANOVA), followed by Tukey test (the level of significance was set at 1%). The storage time factor statistically influenced (p < 0.01) the materials' properties of hardness and roughness. MDX 4-4210 (28.59 Shore A, 0.789 Ra) presented higher values than Silastic 732 RTV (18.08 Shore A, 0.656 Ra) for both properties. Regarding the disinfection period, there was no significant difference in any of the materials tested.
本研究的目的是评估两种用于颌面修复治疗的硅酮在化学消毒和储存影响下的邵氏 A 硬度和表面粗糙度。共获取了 28 个样本，其中一半由 Silastic MDX 4-4210 硅酮制成，另一半由 Silastic 732 RTV 硅酮制成。样本被分为四组：Silastic 732 RTV 和 MDX 4-4210，一组每周用 Efferdent 片剂消毒 3 次，另一组相同材料但不进行消毒。使用邵氏 A 硬度计分析材料的硬度。通过数字便携式粗糙度测试仪在样本制作初始时及制作后 2 个月测定表面粗糙度。应用方差检验（双向方差分析），随后进行 Tukey 检验（显著性水平设定为 1%）。储存时间因素对材料的硬度和粗糙度特性有统计学影响（p < 0.01）。对于这两种特性，MDX 4-4210（邵氏 A 硬度 28.59，表面粗糙度 Ra 0.789）的值均高于 Silastic 732 RTV（邵氏 A 硬度 18.08，表面粗糙度 Ra 0.656）。关于消毒周期，在所测试的任何材料中均未发现显著差异。
