Sawada Tomofumi, Spintzyk Sebastian, Schille Christine, Schweizer Ernst, Scheideler Lutz, Geis-Gerstorfer Jürgen
Section Medical Materials Science & Technology, University Hospital Tübingen, Osianderstrasse 2-8, Tübingen 72076, Germany.
Materials (Basel). 2016 May 5;9(5):339. doi: 10.3390/ma9050339.
The aim of this study was to evaluate the fracture load and failure mode of all-ceramic crowns with different ceria-stabilized tetragonal zirconia/alumina nanocomposite (Ce-TZP/A) framework designs. Four frameworks (anatomical shape: AS, with a buccal or lingual supporting structure: BS and LS, or buccal and lingual supporting structures: BLS) were fabricated. All frameworks were veneered with porcelain to fabricate all-ceramic crowns followed by cementation to tooth analogs. The fracture load of each crown either without or with pre-loading (1.2 million cycles, 49 N) was measured. The failure mode was classified into partial or complete fracture. Differences were tested for significance ( < 0.05) by a two-way Analysis of Variance (ANOVA), followed by Tukey's test and by Fisher's exact test, respectively. Without pre-loading, supporting structures did not influence the fracture load or failure mode. Partial fractures were the most common failure mode. Pre-loading promoted the severity of the failure mode, although the fracture load among the framework designs was not influenced. In the AS group, prefailures were observed during pre-loading, and complete fractures were significantly increased after pre-loading. In contrast, the failure mode of the BLS group remained unchanged, showing only partial fracture even after pre-loading. This Ce-TZP/A framework design, comprised of an anatomical shape with additional buccal and lingual structures, has the potential to reduce the chipping of the veneering porcelain.
本研究的目的是评估不同氧化铈稳定四方氧化锆/氧化铝纳米复合材料（Ce-TZP/A）框架设计的全瓷冠的断裂载荷和失效模式。制作了四种框架（解剖形状：AS，有颊侧或舌侧支撑结构：BS和LS，或颊侧和舌侧支撑结构：BLS）。所有框架均用瓷贴面制作全瓷冠，然后粘结到牙齿模型上。测量每个全瓷冠在无预加载或有预加载（120万次循环，49 N）情况下的断裂载荷。将失效模式分为部分或完全断裂。分别通过双向方差分析（ANOVA），随后进行Tukey检验和Fisher精确检验来检验差异的显著性（<0.05）。在无预加载的情况下，支撑结构不影响断裂载荷或失效模式。部分断裂是最常见的失效模式。预加载促进了失效模式的严重程度，尽管框架设计之间的断裂载荷不受影响。在AS组中，预加载期间观察到预失效，预加载后完全断裂显著增加。相比之下，BLS组的失效模式保持不变，即使在预加载后也仅显示部分断裂。这种由具有额外颊侧和舌侧结构的解剖形状组成的Ce-TZP/A框架设计，有可能减少贴面瓷的崩裂。
