Pesun Igor J, Hodges James, Lai Juey H
Division of Prosthodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, 55455, USA.
J Prosthet Dent. 2002 Mar;87(3):311-8. doi: 10.1067/mpr.2002.122162.
The junction between a long-term, resilient denture liner and the denture base is difficult to finish and polish due to differences in the hardness of the materials. Gaps tend to form during finishing and polishing procedures.
This study measured the junctional gap between 2 long-term, resilient denture liners and a denture base material after different finishing and polishing procedures were performed. The surface smoothness of the 2 liner materials also was evaluated.
Molloplast-B and an experimental, heat-polymerized methyl siloxane-resin-based denture liner were processed (according to the manufacturer's instructions) against Lucitone 199 acrylic resin. Control specimens (n = 20) were 2 mm thick and flat. Experimental specimens (n = 64) were fabricated with a raised center section: a 3- x 5- x 15-mm half-cylindrical ridge with a junction at the top of the cylinder between the liner material and acrylic resin. The specimens were finished with 1 of 6 types of burs and polished with different combinations of rubber-impregnated acrylic polishers, pumice, and tin oxide. The finished specimens were examined and photographed with a scanning electron microscope, and the largest gap along the liner/denture base junction on each specimen was measured. Three-way analysis of variance without replication (P<.05) and post-hoc t tests were used to analyze the data and compare groups. RESULTS; Averaged across finishing and polishing techniques, a larger gap was recorded for the experimental liner material (22 microm) than for Molloplast-B (14 microm) (P<.00005). Qualitative evaluation suggested that the experimental liner material polished better than Molloplast-B. The smoothest surfaces were obtained when specimens were finished with fine-tooth cross-cut carbide burs and polished with both pumice and tin oxide. A comparison between polished and unpolished specimens, averaged over materials and finishing techniques, revealed that polishing reduced gap size (P=.015).
Within the limitations of this study, the 2 denture liners tested behaved similarly. The results suggest that the size of the gap at the liner/denture base junction may be affected by finishing and polishing techniques and vary among materials.
由于材料硬度不同，长期使用的弹性义齿衬垫与义齿基托之间的接合处难以完成修整和抛光。在修整和抛光过程中容易形成间隙。
本研究测量了在进行不同的修整和抛光程序后，两种长期使用的弹性义齿衬垫与一种义齿基托材料之间的接合间隙。还评估了两种衬垫材料的表面光滑度。
按照制造商的说明，将Molloplast - B和一种实验性的热聚合甲基硅氧烷树脂基义齿衬垫与Lucitone 199丙烯酸树脂一起加工。对照样本（n = 20）厚度为2毫米且表面平整。实验样本（n = 64）制作有一个凸起的中心部分：一个3×5×15毫米的半圆柱形脊，在圆柱体顶部衬垫材料与丙烯酸树脂之间有一个接合处。样本用6种类型的车针之一进行修整，并用浸橡胶丙烯酸抛光器、浮石和氧化锡的不同组合进行抛光。对完成后的样本用扫描电子显微镜进行检查和拍照，并测量每个样本沿衬垫/义齿基托接合处的最大间隙。使用无重复的三因素方差分析（P <.05）和事后t检验来分析数据并比较各组。结果：综合修整和抛光技术来看，实验性衬垫材料的间隙（22微米）比Molloplast - B（14微米）更大（P <.00005）。定性评估表明，实验性衬垫材料比Molloplast - B更容易抛光。当样本用细齿交叉切割硬质合金车针修整并用浮石和氧化锡抛光时，可获得最光滑的表面。综合材料和修整技术，对抛光和未抛光样本进行比较，结果显示抛光可减小间隙尺寸（P =.015）。
在本研究的局限性范围内，所测试的两种义齿衬垫表现相似。结果表明，衬垫/义齿基托接合处的间隙大小可能受修整和抛光技术影响，且在不同材料之间存在差异。
