Sczepanski Felipe, Sczepanski Claudia Roberta Brunnquell, Berger Sandrine Bittencourt, Consani Rafael Leonardo Xediek, Gonini-Júnior Alcides, Guiraldo Ricardo Danil
Department of Restorative Dentistry, School of Dentistry, University North of Parana (UNOPAR), Londrina, PR, Brazil.
Department of Physiotherapy, School of Physiotherapy, State University of North Parana (UNEP), Jacarezinho, PR, Brazil.
Eur J Dent. 2014 Oct;8(4):533-537. doi: 10.4103/1305-7456.143638.
To evaluate the surface roughness of acrylic resin submitted to chemical disinfection via 1% sodium hypochlorite (NaClO) or 1% peracetic acid (C2H4O3).
The disc-shaped resin specimens (30 mm diameter ×4 mm height) were polymerized by heated water using two cycles (short cycle: 1 h at 74°C and 30 min at 100°C; conventional long cycle: 9 h at 74°C). The release of substances by these specimens in water solution was also quantified. Specimens were fabricated, divided into four groups (n = 10) depending on the polymerization time and disinfectant. After polishing, the specimens were stored in distilled deionized water. Specimens were immersed in 1% NaClO or 1% C2H4O3 for 30 min, and then were immersed in distilled deionized water for 20 min. The release of C2H4O3 and NaClO was measured via visual colorimetric analysis. Roughness was measured before and after disinfection. Roughness data were subjected to two-way ANOVA and Tukey's test.
There was no interaction between polymerization time and disinfectant in influencing the average surface roughness (Ra, P = 0.957). Considering these factors independently, there were significant differences between short and conventional long cycles (P = 0.012), but no significant difference between the disinfectants hypochlorite and C2H4O3 (P = 0.366). Visual colorimetric analysis did not detect release of substances.
It was concluded that there was the difference in surface roughness between short and conventional long cycles, and disinfection at acrylic resins polymerized by heated water using a short cycle modified the properties of roughness.
评估经1%次氯酸钠（NaClO）或1%过氧乙酸（C2H4O3）进行化学消毒的丙烯酸树脂的表面粗糙度。
圆盘形树脂标本（直径30毫米×高4毫米）通过热水聚合，采用两个周期（短周期：74°C下1小时，100°C下30分钟；传统长周期：74°C下9小时）。还对这些标本在水溶液中的物质释放量进行了量化。根据聚合时间和消毒剂将标本制作出来并分为四组（n = 10）。抛光后，将标本储存在蒸馏去离子水中。将标本浸入1% NaClO或1% C2H4O3中30分钟，然后再浸入蒸馏去离子水中20分钟。通过目视比色分析测量C2H4O3和NaClO的释放量。在消毒前后测量粗糙度。粗糙度数据进行双向方差分析和Tukey检验。
聚合时间和消毒剂在影响平均表面粗糙度（Ra，P = 0.957）方面没有相互作用。单独考虑这些因素时，短周期和传统长周期之间存在显著差异（P = 0.012），但次氯酸盐消毒剂和C2H4O3之间没有显著差异（P = 0.366）。目视比色分析未检测到物质释放。
得出的结论是，短周期和传统长周期在表面粗糙度上存在差异，并且采用短周期通过热水聚合的丙烯酸树脂进行消毒会改变粗糙度特性。
