Graduate student, Postgraduate Program in Dentistry (PPGO), Federal University of Paraíba (UFPB), João Pessoa, Paraíba, Brazil.
PhD student, Postgraduate Program in Dentistry (PPGO), Federal University of Paraíba (UFPB), João Pessoa, Paraíba, Brazil.
J Prosthet Dent. 2022 Sep;128(3):521.e1-521.e8. doi: 10.1016/j.prosdent.2022.07.002. Epub 2022 Aug 13.
Cinnamaldehyde has been successfully used for the short-term disinfection of dentures; however, its long-term effects on the surface and color properties of denture base materials remain unknown.
The purpose of this in vitro study was to evaluate the effects of simulated immersion in cinnamaldehyde for up to 5 years on the surface roughness and color parameters of a heat-polymerized denture resin.
Eighty Ø10×5-mm disk-shaped specimens were prepared from microwave heat-polymerized polymethylmethacrylate (PMMA) and immersed in 4 solutions (n=20): TW-tap water (control), SH - 0.5% sodium hypochlorite, PX-alkaline peroxide, and CA-cinnamaldehyde (27 μg/mL). The immersion protocol simulated 104 cycles (3.5 months), 913 cycles (2.5 years), and 1825 immersion cycles (5 years) of a daily immersion cleaning protocol, with immersion times ranging from 10 to 20-minutes. Surface roughness (Sa) and the color parameters of CIELab (L∗ a∗ b∗, ΔEab), CIEDE2000 (ΔE00), and the National Bureau of Standards (NBS) were analyzed at baseline (t=0) and after the immersion cycles. The data were analyzed by 2-way analysis of variance (ANOVA) for repeated measures and the Tukey post hoc test (α=.01).
Sa was significantly increased in all groups after 1825 cycles compared with baseline (P<.01), regardless of the solution. Only the time factor significantly affected ΔEab, ΔE00, and NBS parameters, which were below the perceptibility and acceptability thresholds. After a simulated 5-year immersion, the surface roughness and color values of CA-treated specimens were not statistically different from those of the other groups (P>.01).
Cinnamaldehyde solution (27 μg/mL) produced minor effects on the surface roughness and color parameters of a heat-polymerized denture base resin similar to those of 0.5% sodium hypochlorite and alkaline peroxide after a 5-year simulated immersion.
肉桂醛已成功用于义齿的短期消毒；然而，其对义齿基托材料表面和颜色特性的长期影响尚不清楚。
本体外研究的目的是评估模拟浸泡在肉桂醛中长达 5 年对热聚合义齿树脂表面粗糙度和颜色参数的影响。
从微波热聚合聚甲基丙烯酸甲酯（PMMA）中制备了 80 个 Ø10×5-mm 圆盘形试件，并将其浸入 4 种溶液中（n=20）：TW-自来水（对照）、SH-0.5%次氯酸钠、PX-碱性过氧化物和 CA-肉桂醛（27μg/mL）。浸泡方案模拟了每天浸泡清洁方案的 104 个循环（3.5 个月）、913 个循环（2.5 年）和 1825 个浸泡循环（5 年），浸泡时间从 10 分钟到 20 分钟不等。在基线（t=0）和浸泡循环后，分析表面粗糙度（Sa）和 CIELab（L∗a∗b∗、ΔEab）、CIEDE2000（ΔE00）和国家标准局（NBS）的颜色参数。数据采用重复测量的 2 因素方差分析（ANOVA）和 Tukey 事后检验（α=.01）进行分析。
与基线相比，所有组在 1825 个循环后 Sa 均显著增加（P<.01），与溶液无关。只有时间因素显著影响ΔEab、ΔE00 和 NBS 参数，这些参数低于可察觉和可接受的阈值。经过模拟 5 年浸泡后，CA 处理的标本的表面粗糙度和颜色值与其他组之间无统计学差异（P>.01）。
肉桂醛溶液（27μg/mL）在模拟浸泡 5 年后，对热聚合义齿基托树脂的表面粗糙度和颜色参数的影响较小，与 0.5%次氯酸钠和碱性过氧化物相似。
