Ayman Al-Dharrab
Ph.D., Associate Professor & Consultant in Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Electron Physician. 2017 Jul 25;9(7):4766-4772. doi: 10.19082/4766. eCollection 2017 Jul.
The utilization of computer-assisted designing and computer-assisted milling CAD\CAM resins in the fabrication of removable prostheses is a modern-day concept that offers many advantages over the use of the traditional polymethylmethacrylate (PMMA).
This study instigated some of the mechanical properties of CAD\CAM denture base resin including the amount of residual monomer.
This study was conducted at the Faculty of Dentistry, King Abdulaziz University from October 2016 to February 2017. A total of seventy rectangular specimens were fabricated (group A: 35 heat-cured PMMA and group B: 35 CAD/CAM pre-polymerized acrylic resin blocks). The flexural strength and surface hardness were tested while the residual monomer content at baseline, two-day and seven-day intervals was estimated using gas chromatography (GC). Means and standard deviations were determined for each group as well as independent-samples t-test and ANOVA with repeated measures for comparison between the groups and subgroups of varying time intervals.
Heat cured PMMA (A), displayed higher flexural strength and low value flexural modulus compared to CAD/CAM acrylic resin denture base material (B). Student t-test indicated highly significant differences (p<0.001) of the flexural strength (t=37.911) and flexural modulus (t=88.559). The surface hardness of group (B) was significantly higher compared to group (A) as indicated by the t-test (t=20.430). Higher release of the monomer content was detected by GC in group (A) at different time intervals with a statistically significant difference (p<0.001) in residual monomer content.
CAD/CAM resin may be considered suitable for use in the construction of denture bases.
在可摘义齿制作中使用计算机辅助设计和计算机辅助铣削（CAD\CAM）树脂是一种现代理念，与使用传统的聚甲基丙烯酸甲酯（PMMA）相比具有许多优势。
本研究探究了CAD\CAM义齿基托树脂的一些机械性能，包括残余单体的含量。
本研究于2016年10月至2017年2月在阿卜杜勒阿齐兹国王大学牙科学院进行。共制作了70个矩形试件（A组：35个热固化PMMA；B组：35个CAD/CAM预聚合丙烯酸树脂块）。测试了弯曲强度和表面硬度，同时使用气相色谱法（GC）估计基线、两天和七天间隔时的残余单体含量。确定每组的均值和标准差，并使用独立样本t检验和重复测量方差分析对不同时间间隔的组和亚组进行比较。
与CAD/CAM丙烯酸树脂义齿基托材料（B组）相比，热固化PMMA（A组）表现出更高的弯曲强度和较低的弯曲模量值。学生t检验表明弯曲强度（t = 37.911）和弯曲模量（t = 88.559）存在极显著差异（p < 0.001）。t检验表明（B组）的表面硬度明显高于（A组）（t = 20.430）。GC检测到（A组）在不同时间间隔的单体含量释放更高，残余单体含量存在统计学显著差异（p < 0.001）。
CAD/CAM树脂可被认为适用于义齿基托的制作。
