热循环对粘结水门汀与氧化锆陶瓷粘结强度的影响。
Effect of thermocycling on bond strength of luting cements to zirconia ceramic.
作者信息
Lüthy Heinz, Loeffel Olivier, Hammerle Christoph H F
机构信息
Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Center for Dental and Oral Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland.
出版信息
Dent Mater. 2006 Feb;22(2):195-200. doi: 10.1016/j.dental.2005.04.016. Epub 2005 Sep 6.
OBJECTIVES
The aim of this study was to evaluate the shear bond strength of different cements to densely sintered zirconia ceramic after aging by thermocycling.
METHODS
The following luting cements for bonding ZrO2-TZP (tetragonal zirconia polycrystals) were used in this study: Ketac-Cem, Nexus, Rely X Unicem, Superbond C&B, Panavia F, and Panavia 21. Groups of 30 test specimens were prepared by bonding stainless steel cylinders tribochemically silica-coated with the Rocatec-system to sandblasted ZrO2-TZP ceramic disks (cercon smart ceramics). Prior to testing all bonded specimens were stored in distilled water (37 degrees C) for 48 h and half of them (n=15) were additionally aged by thermocycling (10,000 times).
RESULTS
None of the fractures occurred at the interface of the metallic rods. The assemblies failed either at the interface between the ceramic surface and the cements or within the cements. Thermocycling affected the bond strength of all luting cements studied except for both Panavia materials and Rely X Unicem.
SIGNIFICANCE
Within the limits of this in vitro study the results showed that-after thermocycling-bond strengths for Ketac-Cem and Nexus were quite low. Nexus in combination with tribochemical silica-coating of ceramic surface produced a higher bond strength. The four adhesive resin cements (Rely X Unicem, Superbond C&B, Panavia F, and Panavia 21) gave superior results. The strongest bond to zirconia was obtained with Panavia 21.
目的
本研究旨在评估经热循环老化后不同粘结剂与致密烧结氧化锆陶瓷之间的剪切粘结强度。
方法
本研究使用了以下用于粘结ZrO2-TZP（四方氧化锆多晶体）的粘结剂：Ketac-Cem、Nexus、Rely X Unicem、Superbond C&B、Panavia F和Panavia 21。通过将经Rocatec系统进行摩擦化学硅涂层处理的不锈钢圆柱体粘结到喷砂处理的ZrO2-TZP陶瓷盘（cercon智能陶瓷）上，制备了每组30个测试样本。在测试前，所有粘结样本在蒸馏水（37℃）中储存48小时，其中一半样本（n = 15）额外进行热循环老化（10000次）。
结果
所有断裂均未发生在金属棒的界面处。组件失效要么发生在陶瓷表面与粘结剂之间的界面处，要么发生在粘结剂内部。除了Panavia两种材料和Rely X Unicem外，热循环影响了所有研究的粘结剂的粘结强度。
意义
在本体外研究的范围内，结果表明——热循环后——Ketac-Cem和Nexus的粘结强度相当低。Nexus与陶瓷表面的摩擦化学硅涂层相结合产生了更高的粘结强度。四种粘结树脂粘结剂（Rely X Unicem、Superbond C&B、Panavia F和Panavia 21）给出了更好的结果。使用Panavia 21获得了与氧化锆的最强粘结。
Zotero 插件