Department of Dental Materials and Prosthodontics, University of São Paulo, School of Dentistry of Ribeirão Preto, Brazil.
Department of Pediatric Dentistry, University of São Paulo, School of Dentistry of Ribeirão Preto, Brazil.
J Prosthodont. 2019 Feb;28(2):e857-e862. doi: 10.1111/jopr.12680. Epub 2017 Dec 13.
To evaluate the effect of experimental (Ricinus communis) and commercial dentifrices used for denture cleaning on abrasiveness (gravimetric method; roughness), hardness, and color stability of a resilient relining material.
Sixty circular (15 × 3 mm) specimens were distributed into four groups: C (control; brushing with water); CO (brushing with Colgate - for natural teeth); CB (brushing with Corega Brite - for complete dentures); RC (brushing with experimental dentifrice). Brushing was performed in a toothbrushing machine with a soft brush and a dentifrice suspension for 50 minutes, calculated to correspond to 1 year of regular brushing. Variables were measured initially and after the trial period. For the gravimetric method, the difference in mass was considered. The surface roughness was measured by a rugosimeter, and the hardness test was performed by a Shore A durometer. Color changes (ΔE; CIE Lab* and NBS systems) were measured by a portable spectrophotometer. Results were analyzed by ANOVA/Tukey's test (α = 0.05).
The largest mass variation (μg; p < 0.0001) occurred in C (-6.21 ± 3.18). Concerning roughness, CB (0.26 ± 0.04) showed the lowest value, followed by RC (0.29 ± 0.08) and CO (0.34 ± 0.24) (p < 0.0001). Group C produced the greatest surface roughness (0.72 ± 0.25). Hardness values decreased after brushing with water (p = 0.014). No significant differences were found among RC (50.31 ± 1.03), CO (49.11 ± 1.31), CB (49.17 ± 1.23), and C (48.02 ± 1.26). Color stability was similar in all groups (p = 0.135; C: 2.3 ± 0.77; CO: 2.6 ± 0.54; CB: 2.2 ± 0.44; RC: 2.9 ± 1.56).
The use of experimental dentifrice could be indicated, as it showed similar results to the specific dentifrice, keeping the resilient material properties within acceptable values.
评估实验性（蓖麻）和商业假牙清洁剂对弹性衬里材料的耐磨性（重量法；粗糙度）、硬度和颜色稳定性的影响。
将 60 个圆形（15×3mm）试件分为四组：C（对照；用水刷牙）；CO（用 Colgate 刷牙-用于天然牙齿）；CB（用 Corega Brite 刷牙-用于全口义齿）；RC（用实验性牙膏刷牙）。在牙齿刷洗机上用软毛刷和牙膏悬浮液刷洗 50 分钟，计算相当于常规刷洗 1 年。初始和试验期后测量变量。对于重量法，考虑质量差异。用粗糙度仪测量表面粗糙度，用 Shore A 硬度计进行硬度测试。用便携式分光光度计测量颜色变化（ΔE；CIE Lab*和 NBS 系统）。结果采用方差分析/ Tukey 检验（α=0.05）进行分析。
最大质量变化（μg;p<0.0001）发生在 C 组（-6.21±3.18）。关于粗糙度，CB（0.26±0.04）值最低，其次是 RC（0.29±0.08）和 CO（0.34±0.24）（p<0.0001）。C 组产生的表面粗糙度最大（0.72±0.25）。用清水刷牙后硬度值下降（p=0.014）。RC（50.31±1.03）、CO（49.11±1.31）、CB（49.17±1.23）和 C（48.02±1.26）组之间无显著差异。所有组的颜色稳定性相似（p=0.135；C：2.3±0.77；CO：2.6±0.54；CB：2.2±0.44；RC：2.9±1.56）。
实验性牙膏的使用可能是可取的，因为它与特定牙膏的结果相似，使弹性材料的性能保持在可接受的范围内。
