Aleksandruk Grazyna
Zakładu Protetyki Stomatologicznej Pomorskiej Akademii Medycznej w Szczecinie, al. Powstańców Wlkp. 72, 70-111 Szczecin.
Ann Acad Med Stetin. 2002;48:163-78.
This work has dealt with the in vitro physicochemical, elastic, and microbiological properties of polymer lining materials used in dental prosthetics. Representatives of two soft polymer groups were analyzed: Vertex Soft NF, a plastified acrylic polymer, and Molloplast B, a silicon elastomer. Vertex Rapid Simplified and Triplex--two acrylic polymers routinely used at the Department of Prosthetic Dentistry were chosen as representatives of rigid acrylic material. The laminar plates of the denture are lined with elastic material to reduce wear discomfort and eliminate symptoms associated with compression of the oral mucosa by the denture. Wear-dependent deterioration in physicochemical, elastic, and microbiological properties presents as prosthetic stomatopathies due to the combined action of mechanical lesions, fungal growth, and toxicity of components of the denture, necessitating replacement of the denture. Samples used in this study were prepared at the Department of Dental Prosthetics, Pomeranian Academy of Medicine. The process of polymerization was carried out strictly as recommended by the manufacturers. The in vitro analyses were done at the Polymer Institute, Technical University of Szczecin, and the Department of Microbiology and Immunology, Pomeranian Academy of Medicine. A special system was used to reproduce conditions in the oral cavity and study their effects on the elastic liners. Samples were placed in the chamber for varying periods, depending on the type of test and material. Thermodynamic analysis was done to confirm proper polymerization and hardening. Time-dependent loss of contact between the elastic liner and rigid denture under tangential (shear) and normal (tear) stress applied to the liner-denture interface was examined. Resistance was studied using INSTRON model 4206-006 universal testing machine. Compressive changes in elastic properties of the soft materials were examined by calculating Young's modulus. Changes in viscoelastic properties of the materials depending on temperature and frequency were followed using dynamic mechanical thermal analysis (DMTA). A precision microbalance from Sartorius (+/- 0.00001 g) was used to measure time-dependent changes in weight and sorption of water. Adhesion of Candida albicans to the rigid and soft acrylic materials was determined after incubation for 3, 6 or 24 h at 37 degrees C. The study has shown that adhesive strength is much greater for acryl-acryl than acryl-silicon interface. Elastic properties of Molloplast B are very stable and superior to those of Vertex Soft NF. Time-dependent sorption of water and changes in weight have confirmed the stable nature of Molloplast B. Adhesion of Candida albicans to Vertex Soft NF was less noticeable.
这项工作研究了牙科修复体中使用的聚合物衬里材料的体外物理化学、弹性和微生物学特性。分析了两种软质聚合物组的代表材料：Vertex Soft NF（一种增塑丙烯酸聚合物）和Molloplast B（一种硅橡胶）。选择了义齿修复科常规使用的两种丙烯酸聚合物Vertex Rapid Simplified和Triplex作为硬质丙烯酸材料的代表。义齿的层状板用弹性材料衬里，以减少磨损不适，并消除义齿对口腔黏膜压迫相关的症状。由于机械损伤、真菌生长和义齿成分毒性的共同作用，物理化学、弹性和微生物学特性随磨损而恶化会导致义齿性口炎，因此需要更换义齿。本研究中使用的样本由波美拉尼亚医学院义齿修复科制备。聚合过程严格按照制造商的建议进行。体外分析在什切青工业大学聚合物研究所和波美拉尼亚医学院微生物学与免疫学系进行。使用一种特殊系统来重现口腔环境并研究其对弹性衬里的影响。根据测试类型和材料，将样本放置在腔室中不同的时间段。进行热力学分析以确认聚合和硬化是否适当。研究了在衬里 - 义齿界面施加切向（剪切）和法向（撕裂）应力时，弹性衬里与硬质义齿之间随时间的接触损失情况。使用INSTRON 4206 - 006型万能试验机研究阻力。通过计算杨氏模量来检查软质材料弹性性能的压缩变化。使用动态机械热分析（DMTA）跟踪材料的粘弹性性能随温度和频率的变化。使用赛多利斯精密微量天平（精度为±0.00001 g）测量重量随时间的变化以及水的吸附情况。在37℃下孵育3、6或24小时后，测定白色念珠菌对硬质和软质丙烯酸材料的粘附情况。研究表明，丙烯酸 - 丙烯酸界面的粘合强度远大于丙烯酸 - 硅橡胶界面。Molloplast B的弹性性能非常稳定，优于Vertex Soft NF。随时间的水吸附和重量变化证实了Molloplast B的稳定性。白色念珠菌对Vertex Soft NF的粘附不太明显。
