Faculty of Dental Medicine, Centre for Interdisciplinary Research in Health (CIIS), Estrada da Circunvalação, Universidade Católica Portuguesa, Estrada da Circunvalação, Viseu, 3504 - 505, Portugal.
Faculty of Engineering (FEUP), Universidade do Porto, Praça Gomes Teixeira, Porto, 4099-002, Portugal.
BMC Oral Health. 2024 May 30;24(1):641. doi: 10.1186/s12903-024-04397-1.
Different processing techniques are employed to obtain poly (methyl methacrylate) (PMMA) with consistent surface quality in terms of topography and tribological function. The purpose of this research is to evaluate its influence on the surface height distribution.
In this research, samples of conventional and CAD/CAM acrylic resins were prepared. The following surface roughness parameters were extracted from the profilometric readings: arithmetic mean roughness (Pa), skewness (Psk) and kurtosis (Pku). Profilometric profiles were additionally obtained.
The average roughness (Pa) with the conventional technique was significantly higher compared to CAD/CAM (t = 4.595; P < 0.001). Heat-cured resins presented the highest mean Pa (F = 6.975; P = 0.06). Heat-cured and milled resins show lower coefficient variation (CV) values, indicating more consistent surface finishing. The surface profiles revealed distinct characteristics in terms of skewness and kurtosis.
The surface processing method, chemical composition and resin type significantly influence the surface finishing of the resin. The CAD/CAM resins exhibited superior results in terms of surface arithmetic mean roughness (Pa). However, heat-cured resin revealed to present the better surface consistency.
为了获得在形貌和摩擦学功能方面具有一致表面质量的聚甲基丙烯酸甲酯（PMMA），采用了不同的加工技术。本研究旨在评估其对表面高度分布的影响。
本研究中，制备了常规和 CAD/CAM 丙烯酸树脂样品。从轮廓测量读数中提取以下表面粗糙度参数：算术平均粗糙度（Pa）、偏度（Psk）和峰度（Pku）。此外，还获得了轮廓曲线。
与 CAD/CAM 相比，常规技术的平均粗糙度（Pa）显著更高（t=4.595；P<0.001）。热固化树脂的平均 Pa 值最高（F=6.975；P=0.06）。热固化和铣削树脂的变异系数（CV）值较低，表明表面精加工更一致。表面轮廓在偏度和峰度方面呈现出明显的特征。
表面加工方法、化学成分和树脂类型显著影响树脂的表面精加工。CAD/CAM 树脂在表面算术平均粗糙度（Pa）方面表现出更好的结果。然而，热固化树脂显示出更好的表面一致性。
