Freitas-Pontes Karina M, Silva-Lovato Cláudia H, Paranhos Helena F O
Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
J Appl Oral Sci. 2009 Mar-Apr;17(2):116-21. doi: 10.1590/s1678-77572009000200009.
The association between a toothbrush and a dentifrice is the most used denture cleaning method. The purpose of this study was to evaluate the abrasiveness of specific and non-specific denture cleaning dentifrices on different heat-polymerized acrylic resins. Sixteen specimens (90 x 30 x 3 mm) of each acrylic resin (QC-20, Lucitone 550, Clássico, Vipi-Cril) were prepared and randomly assigned to 4 groups: 1: control (distilled water), 2: Colgate, 3: Bonyplus and 4: Dentu-Creme. The specimens were subjected to simulated toothbrushing in an automatic brushing machine using 35,600 brush strokes for each specimen. Brushing abrasion run at a 200-g load with the specimens immersed in 2:1 dentifrice/water slurry. Specimens were reconditioned to constant mass and the mass loss (mg) was evaluated. Data were analyzed by 2-way ANOVA and Tukey's test (a=0.05). Analysis of dentifrices' abrasive particles was made by scanning electron microscopy. Colgate produced the greatest mass reduction (42.44 mg, p<0.05), followed by Dentu-Creme (33.60 mg). Bonyplus was the less abrasive (19.91 mg), similar to the control group (19.69 mg) (p>0.05). The mass loss values indicated that QC-20 (33.13 mg) and Lucitone 550 (33.05 mg) resins were less (p<0.05) resistant to abrasion than Clássico (26.04 mg) and Vipi-Cril (23.43 mg). In conclusion, Colgate produced the greatest abrasion. Specific dentifrices for dentures tend to cause less damage to acrylic resins.
牙刷与牙膏配合使用是最常用的义齿清洁方法。本研究的目的是评估特定和非特定义齿清洁牙膏对不同热聚合丙烯酸树脂的磨损性。制备了每种丙烯酸树脂（QC - 20、Lucitone 550、Clássico、Vipi - Cril）的16个样本（90×30×3毫米），并随机分为4组：1：对照组（蒸馏水），2：高露洁，3：Bonyplus，4：Dentu - Creme。样本在自动刷牙机中进行模拟刷牙，每个样本刷35600次。刷牙磨损在200克负载下进行，样本浸泡在牙膏/水比例为2:1的浆液中。样本重新处理至质量恒定，并评估质量损失（毫克）。数据通过双向方差分析和Tukey检验（α = 0.05）进行分析。通过扫描电子显微镜对牙膏的磨料颗粒进行分析。高露洁导致的质量减少最大（42.44毫克，p<0.05），其次是Dentu - Creme（33.60毫克）。Bonyplus的磨损性最小（19.91毫克），与对照组（19.69毫克）相似（p>0.05）。质量损失值表明，QC - 20（33.13毫克）和Lucitone 550（33.05毫克）树脂比Clássico（26.04毫克）和Vipi - Cril（23.43毫克）树脂更不耐磨损（p<0.05）。总之，高露洁产生的磨损最大。特定的义齿牙膏往往对丙烯酸树脂造成的损害较小。
