Guiraldo Ricardo Danil, Berger Sandrine Bittencourt, Punhagui Marilia Franco, Moretto Thais Staut, Lopes Murilo Baena, Gonini-Júnior Alcides, Sinhoreti Mário Alexandre Coelho
Department of Restorative Dentistry, School of Dentistry, University of North Parana, Londrina, Paraná, Brazil.
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
Eur J Dent. 2018 Apr-Jun;12(2):232-236. doi: 10.4103/ejd.ejd_195_17.
The aim of this study was to evaluate the stability of elastomer through detail reproduction and its dimensional stability (DS) after disinfection with 0.2% chloramine-T.
The elastomeric impression dental materials used in this study were polydimethylsiloxane (Oranwash L), polyvinyl siloxane (Express), polysulfide (Permlastic), and polyether (Impregum Soft). The entire press procedure was performed on a matrix in accordance with the ISO 4823. Detail reproduction was analyzed using an optical microscope (Stereozoom Microscope) over the 20-μm line with 25 mm of length at a magnification of ×4. DS was measured using an optical microscope (Scanning Tunneling Microscope) by subtracting the distance between the lines X and X' over the 20-μm line on the matrix (DM) from the distance between the lines on the impression material (DI) divided by DM and multiplied by 100 establishing the equation: DS = ([DI - DM]/DM) ×100; then, 100% was added to the results of the equation. The detail reproduction values were subsequently subjected to descriptive analysis by percentage (%), and the DS values (%) were submitted to Kolmogorov-Smirnov test, two-way ANOVA (material × disinfectant), and Tukey's test (α = 0.05).
All elastomeric impression materials showed 100% of detail reproduction, regardless of the disinfection procedure. Polysulfide (not disinfected) and polysulfide and polydimethylsiloxane (after disinfection with 0.2% chloramine-T) showed the smaller mean values of DS.
According to the stability properties analyzed, chloramine-T can be used for disinfection of elastomer molds.
本研究旨在通过细节再现评估弹性体的稳定性及其经0.2%氯胺-T消毒后的尺寸稳定性（DS）。
本研究中使用的弹性体印模牙科材料为聚二甲基硅氧烷（Oranwash L）、乙烯基聚硅氧烷（Express）、聚硫橡胶（Permlastic）和聚醚（Impregum Soft）。整个压制过程按照ISO 4823在模具上进行。使用光学显微镜（立体变焦显微镜）在长度为25 mm的20-μm线条上以×4放大倍数分析细节再现。使用光学显微镜（扫描隧道显微镜）测量DS，方法是用印模材料上20-μm线条上线条之间的距离（DI）减去模具上20-μm线条上线条X和X'之间的距离（DM），再除以DM并乘以100，建立公式：DS = ([DI - DM]/DM) ×100；然后，将该公式的结果加上100%。随后对细节再现值进行百分比（%）描述性分析，DS值（%）进行柯尔莫哥洛夫-斯米尔诺夫检验、双向方差分析（材料×消毒剂）和Tukey检验（α = 0.05）。
无论消毒程序如何，所有弹性体印模材料的细节再现率均为100%。聚硫橡胶（未消毒）以及聚硫橡胶和聚二甲基硅氧烷（经0.2%氯胺-T消毒后）的DS平均值较小。
根据所分析的稳定性特性，氯胺-T可用于弹性体模具的消毒。
