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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of chemical disinfectants on the transverse strength of heat-polymerized acrylic resins submitted to mechanical and chemical polishing.
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Effect of chemical disinfectants on the transverse strength of heat-polymerized acrylic resins submitted to mechanical and chemical polishing.

机译：化学消毒剂对经受机械和化学抛光的热聚合丙烯酸树脂的横向强度的影响。

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STATEMENT OF PROBLEM: Immersion in chemical solutions used for cleansing and disinfecting prostheses can decrease the strength of denture base resins, making them more prone to fracture during use. PURPOSE: The purpose of this study was to assess the effect of immersion in different chemical disinfectants for varying time periods on the transverse strength of 3 mechanically or chemically polished heat-polymerized acrylic resins. MATERIAL AND METHODS: A total of 630 rectangular specimens (65 x 10 x 3 mm), 210 per resin (Classico, Lucitone 550, and QC-20), were fabricated. One side of each specimen was not polished and the other was either mechanically (n=300) or chemically (n=300) polished, and immersed for 10, 20, 30, 45, or 60 minutes in either 1%, 2.5%, or 5.25% sodium hypochlorite or 2% glutaraldehyde. Mechanically polished (n=15) and chemically polished (n=15) control specimens were immersed only in distilled water. The transverse strength (N/mm 2 ) was tested for failure in a universal testing machine, at a crosshead speed of 5 mm/min. Data were statistically analyzed using 2-way ANOVA and Student t test. Multiple comparisons were performed using Tukey and Scheffe tests (alpha=.05). RESULTS: There was significant difference (P < .01) between types of polishing, with chemical polishing resulting in lower transverse strength. ANOVA identified significant differences (P < .01) in strength between mechanically polished Lucitone 550 and QC-20, and among all 3 chemically polished resins. No significant differences were observed between resins submitted to both types of polishing or between different immersion periods (10 to 60 minutes), disinfectants, or interaction. CONCLUSIONS: Lucitone 550 resin presented the greatest transverse strength values with both types of polishing. Among the mechanically and chemically polished specimens, transverse strength was not affected after immersion in the disinfectants for the immersion periods tested (10 to 60 minutes). Chemically polished control and experimental (immersed in all solutions) QC-20 specimens showed significant differences in transverse strength values.
机译：问题陈述：浸入用于清洁和消毒假牙的化学溶液中会降低义齿基料树脂的强度，使其在使用过程中更容易断裂。目的：本研究的目的是评估在不同时间段内浸泡在不同化学消毒剂中对3种机械或化学抛光的热聚合丙烯酸树脂的横向强度的影响。材料与方法：总共制作了630个矩形样本（65 x 10 x 3毫米），每种树脂210个（Classico，Lucitone 550和QC-20）。每个标本的一侧均未抛光，另一侧则进行机械抛光（n = 300）或化学抛光（n = 300），并分别以1％，2.5％，10％，20％，30％，45％或60分钟浸泡，或5.25％次氯酸钠或2％戊二醛。机械抛光（n = 15）和化学抛光（n = 15）的对照样品仅浸入蒸馏水中。在万能试验机中以5mm / min的十字头速度测试横向强度（N / mm 2）是否损坏。数据采用2通方差分析和Student t检验进行统计分析。使用Tukey和Scheffe测试（alpha = .05）进行了多次比较。结果：抛光类型之间存在显着差异（P <.01），化学抛光导致较低的横向强度。方差分析表明，机械抛光的Lucitone 550和QC-20之间以及所有三种化学抛光的树脂之间在强度上存在显着差异（P <.01）。在两种抛光类型的树脂之间或在不同的浸泡时间（10至60分钟），消毒剂或相互作用之间都没有观察到显着差异。结论：Lucitone 550树脂在两种抛光方式下均表现出最大的横向强度值。在机械和化学抛光的样本中，在测试的浸泡时间（10至60分钟）中浸泡在消毒剂中后，横向强度没有受到影响。化学抛光的对照样品和实验样品（浸入所有溶液中）的QC-20样品在横向强度值上存在显着差异。

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