Mahross Hamada Zaki, Mohamed Mahmoud Darwish, Hassan Ahmed Mohammed, Baroudi Kusai
Assistant Professor, Department of Prosthodontics, Alfarabi Collages , Riyadh, Saudi Arabia .
Assistant Professor, Department of Restorative Dental Sciences, Alfarabi Collages , Riyadh, Saudi Arabia .
J Clin Diagn Res. 2015 Sep;9(9):ZC39-42. doi: 10.7860/JCDR/2015/14580.6488. Epub 2015 Sep 1.
Surface roughness is an important property of denture bases since denture bases are in contact with oral tissues and a rough surface may affect tissues health due to microorganism accumulation. Therefore, the effect of cigarette smoke on the surface roughness of two commercially available denture base materials was evaluated to emphasize which type has superior properties for clinical use.
A total numbers of 40 specimens were constructed from two commercially available denture base materials; heat-cured PMMA and visible light cured UDMA resins (20 for each). The specimens for each type were randomly divided into: Group I: Heat cured resin control group; Group II: Heat cured acrylic resin specimens exposed to cigarette smoking; Group III: Light cured resin control group; Group IV: Light cured resin specimens exposed to cigarette smoking. The control groups used for immersion in distilled water and the smoke test groups used for exposure to cigarette smoking. The smoke test groups specimens were exposed to smoking in a custom made smoking chamber by using 20 cigarettes for each specimen. The surface roughness was measured by using Pocket SurfPS1 profilometer and the measurements considered as the difference between the initial and final roughness measured before and after smoking.
The t-test for paired observation of test specimens after exposure to smoking was indicated significant change in surface roughness for Group II (p< 0.05) but has no significance with Group IV. Otherwise, there were no significant differences with control groups (Group I and III).
The surface roughness of the dentures constructed from heat cured acrylic resin had been increased after exposure to cigarette smoke but had no impact on the dentures constructed from visible light cured resin.
义齿基托的表面粗糙度是一项重要特性，因为义齿基托与口腔组织接触，粗糙表面可能因微生物积聚而影响组织健康。因此，评估香烟烟雾对两种市售义齿基托材料表面粗糙度的影响，以强调哪种类型在临床应用中具有更优越的性能。
用两种市售义齿基托材料制作40个标本；热固化聚甲基丙烯酸甲酯（PMMA）和可见光固化的甲基丙烯酸聚氨酯（UDMA）树脂（各20个）。每种类型的标本随机分为：第一组：热固化树脂对照组；第二组：暴露于香烟烟雾中的热固化丙烯酸树脂标本；第三组：光固化树脂对照组；第四组：暴露于香烟烟雾中的光固化树脂标本。对照组用于浸入蒸馏水中，烟雾测试组用于暴露于香烟烟雾中。烟雾测试组的标本在定制的吸烟室中暴露于烟雾中，每个标本使用20支香烟。使用袖珍式SurfPS1表面轮廓仪测量表面粗糙度，测量值视为吸烟前后测量的初始粗糙度和最终粗糙度之间的差异。
对暴露于吸烟后的测试标本进行配对观察的t检验表明，第二组表面粗糙度有显著变化（p<0.05），但第四组无显著性差异。否则，与对照组（第一组和第三组）无显著差异。
热固化丙烯酸树脂制成义齿的表面粗糙度在暴露于香烟烟雾后有所增加，但对可见光固化树脂制成的义齿没有影响。
