Raggio Daniela Prócida, Bonifácio Clarissa Calil, Bönecker Marcelo, Imparato José Carlos P, Gee Anton J de, Amerongen Willem Evert van
Department of Pediatric Dentistry, Dental School, University of São Paulo, São Paulo, SP, Brazil.
Braz Dent J. 2010;21(5):439-45. doi: 10.1590/s0103-64402010000500011.
The aim of this study was to assess the Knoop hardness of three high viscous glass ionomer cements: G1 - Ketac Molar; G2 - Ketac Molar Easymix (3M ESPE) and G3 - Magic Glass ART (Vigodent). As a parallel goal, three different methods for insertion of Ketac Molar Easymix were tested: G4 - conventional spatula; G5 - commercial syringe (Centrix) and G6 - low-cost syringe. Ten specimens of each group were prepared and the Knoop hardness was determined 5 times on each specimen with a HM-124 hardness machine (25 g/30 s dwell time) after 24 h, 1 and 2 weeks. During the entire test period, the specimens were stored in liquid paraffin at 37ºC. Significant differences were found between G3 and G1/G2 (two-way ANOVA and Tukey's post hoc test; p<0.01). There was no significant difference in the results among the multiple ways of insertion. The glass ionomer cement Magic Glass ART showed the lowest hardness, while the insertion technique had no significant influence on hardness.
G1 - Ketac Molar；G2 - Ketac Molar Easymix（3M ESPE）和G3 - Magic Glass ART（Vigodent）。作为一个平行目标，测试了三种不同的Ketac Molar Easymix置入方法：G4 - 传统刮勺；G5 - 商用注射器（Centrix）和G6 - 低成本注射器。每组制备10个样本，在24小时、1周和2周后，使用HM - 124硬度计（25克/30秒保压时间）对每个样本进行5次努氏硬度测定。在整个测试期间，样本保存在37℃的液体石蜡中。G3与G1/G2之间存在显著差异（双向方差分析和Tukey事后检验；p<0.01）。多种置入方式的结果之间没有显著差异。玻璃离子水门汀Magic Glass ART显示出最低的硬度，而置入技术对硬度没有显著影响。
