Fouda Shaimaa M, Gad Mohammed M, Ellakany Passent, El Zayat Mai, Farooqi Faraz A, Akhtar Sultan, Salah El-Din Mai
Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
Department of Dental Education, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.
J Prosthodont. 2025 Jan;34(1):91-100. doi: 10.1111/jopr.13801. Epub 2023 Nov 27.
To assess the influence of denture brushing on the surface roughness, hardness, and color stability of conventional, thermoformed, and CAD-CAM denture base materials.
Seven different denture base materials were included in this study; conventional heat-polymerized acrylic resin (PMMA) served as control, polyamide, acetal, two categories of milled acrylic discs (AvaDent and IvoCad), and two categories of 3D-printed resins (NextDent and FormLabs). The specimens were constructed according to manufacturers' instructions and then subjected to simulated brushing (20,000 cycles). According to the brushing method, the specimens were split into three groups, no brushing, brushing with water, and brushing with toothpaste. Surface roughness, hardness, and color change were evaluated before and after brushing. Collected data were analyzed using ANOVA, and post-hoc Tukey's tests (α = 0.05).
A significant difference was noted between the surface roughness of the tested materials before and after denture brushing (p < 0.05), and milled resin showed the least Ra values. Denture brushing with water significantly increased the Ra of PMMA (p = 0.004) and IvoCad (p = 0.032), while brushing using toothpaste did not show a significant increase. The brushing protocols did not alter the hardness of tested materials except that of PMMA (p = 0.001). The color stability of the tested materials showed comparable results with both brushing protocols.
The tested properties showed variations between the types of denture base resins. Hardness and color stability of CAD-CAM and thermoformed denture base resins were not altered by denture brushing and showed comparable results with both brushing methods. Surface roughness was the only property that showed alteration after denture brushing.
评估义齿刷牙对传统、热成型和计算机辅助设计与制造（CAD-CAM）义齿基托材料的表面粗糙度、硬度和颜色稳定性的影响。
本研究纳入了七种不同的义齿基托材料；传统热聚合丙烯酸树脂（聚甲基丙烯酸甲酯，PMMA）作为对照，聚酰胺、乙缩醛、两类铣削丙烯酸盘（AvaDent和IvoCad）以及两类3D打印树脂（NextDent和FormLabs）。标本按照制造商说明制作，然后进行模拟刷牙（20000次循环）。根据刷牙方法，标本分为三组，不刷牙、用水刷牙和用牙膏刷牙。在刷牙前后评估表面粗糙度、硬度和颜色变化。收集的数据使用方差分析和事后Tukey检验（α = 0.05）进行分析。
义齿刷牙前后测试材料的表面粗糙度存在显著差异（p < 0.05），铣削树脂的Ra值最小。用水刷牙显著增加了PMMA（p = 0.004）和IvoCad（p = 0.032）的Ra值，而用牙膏刷牙未显示出显著增加。刷牙方案除了对PMMA的硬度有影响外（p = 0.001），未改变测试材料的硬度。两种刷牙方案下测试材料的颜色稳定性结果相当。
测试的性能在义齿基托树脂类型之间存在差异。CAD-CAM和热成型义齿基托树脂的硬度和颜色稳定性不会因义齿刷牙而改变，并且两种刷牙方法的结果相当。表面粗糙度是义齿刷牙后唯一显示出变化的性能。
