含消毒剂和改性剂的石膏混合物对表面处理过的硅酮印模材料的湿润情况。

Abdelaziz Khalid M, Combe Edward C, Hodges James S

Mansoura University, Faculty of Dentistry, Egypt.

J Prosthodont. 2005 Jun;14(2):104-9. doi: 10.1111/j.1532-849X.2005.00019.x.

PURPOSE

This work evaluated wettability of silicone impression surfaces by gypsum mixes containing disinfectants.

MATERIALS AND METHODS

Two types of dental stone were modified by mixing with aqueous solutions of either sodium hypochlorite or povidone iodine. These materials were subjected to further modification by adding a mixture of 1% gum arabic and 0.132% calcium hydroxide to reduce the water requirement of the hemihydrate. Mix consistency tests were carried out to determine the effect of the disinfectants and the modifying additives on the mix fluidity. Contact angles of the mixed materials were measured when they were poured against a polyvinylsiloxane impression material that had undergone the following treatments (1) no treatment (control), (2) surfactant treated, (3) disinfectant treated, and (4) treated with both surfactant and disinfectant. One-way analysis of variance (ANOVA) was carried out using Dunnett's method to determine if experimental groups were significantly different from the control.

RESULTS

Gypsum mix consistency was reduced by the presence of combined gum arabic and calcium hydroxide additives. Contact angle data showed that the additives and disinfectants incorporated into the gypsum had, in general, no beneficial effect on the wetting of an untreated silicone surface, or a surface treated with surfactant. In some instances, better wetting was obtained with disinfectant-treated surfaces, and surfaces that had been disinfected and treated with surfactant.

CONCLUSIONS

Fluidity of the mixed gypsum was affected by the modifying additives. Chemical disinfectants incorporated in gypsum have little effect on the wetting behavior of dental gypsum. Modifying dental stone powders with gum arabic and calcium hydroxide additives (before mixing at the manufacturers' recommended liquid/powder ratios), improved the wetting behavior of the mixed materials in some cases, but results were not consistent.

目的

本研究评估了含消毒剂的石膏混合物对硅橡胶印模表面的润湿性。

材料与方法

将两种类型的牙科石膏与次氯酸钠或聚维酮碘水溶液混合进行改性。通过添加1%阿拉伯胶和0.132%氢氧化钙的混合物进一步改性这些材料，以降低半水石膏的需水量。进行混合稠度测试，以确定消毒剂和改性添加剂对混合物流动性的影响。当将混合材料浇铸在经过以下处理的聚硅氧烷印模材料上时，测量其接触角：（1）未处理（对照），（2）表面活性剂处理，（3）消毒剂处理，以及（4）表面活性剂和消毒剂联合处理。使用Dunnett法进行单因素方差分析（ANOVA），以确定实验组与对照组是否存在显著差异。