Edge chipping and flexural resistance of monolithic ceramics.
Edge chipping and flexural resistance of monolithic ceramics.
复制标题
DOI：
10.1016/j.dental.2013.09.004
复制
发表时间：
2013-12
期刊：
影响因子：
5
通讯作者：
Lawn, Brian R.
中科院分区：
文献类型：
--
作者：
Zhang, Yu;Lee, James J. -W.;Srikanth, Ramanathan;Lawn, Brian R.
关键词：
测试这样一种假设，即整体陶瓷可以开发出兼具美学和上级抗断裂性的产品，以规避传统全瓷冠和固定义齿的加工和性能缺陷，这些全瓷冠和固定义齿由坚硬坚固的核和美观的瓷贴面组成。具体来说，是为了证明可以生产出具有更低断裂敏感性的整体假体。应用方案来量化两类牙科陶瓷，微结构改性氧化锆和二硅酸锂玻璃陶瓷的抗碎裂性以及抗弯曲失效性。一个尖锐的压头被用来诱导芯片附近的边缘的平层试样，并与预测的结果进行比较，从临界载荷方程。从建立的弯曲强度关系和实验数据验证的预测计算所需的临界载荷产生粘结到牙本质的整体标本的粘结表面失效。整体氧化锆相对于它们的贴面对应物具有上级抗碎裂性和抗弯曲断裂性。虽然它们具有上级美学，但相对于瓷饰面氧化锆，玻璃陶瓷表现出较低的强度但较高的抗碎片断裂性。这项研究表明，新的和改进的整体陶瓷装饰，结合耐用性和可接受的美学前景广阔。
Test the hypothesis that monolithic ceramics can be developed with combined esthetics and superior fracture resistance to circumvent processing and performance drawbacks of traditional all-ceramic crowns and fixed-dental-prostheses consisting of a hard and strong core with an esthetic porcelain veneer. Specifically, to demonstrate that monolithic prostheses can be produced with a much reduced susceptibility to fracture. Protocols were applied for quantifying resistance to chipping as well as resistance to flexural failure in two classes of dental ceramic, microstructurally-modified zirconias and lithium disilicate glass–ceramics. A sharp indenter was used to induce chips near the edges of flat-layer specimens, and the results compared with predictions from a critical load equation. The critical loads required to produce cementation surface failure in monolithic specimens bonded to dentin were computed from established flexural strength relations and the predictions validated with experimental data. Monolithic zirconias have superior chipping and flexural fracture resistance relative to their veneered counterparts. While they have superior esthetics, glass–ceramics exhibit lower strength but higher chip fracture resistance relative to porcelain-veneered zirconias. The study suggests a promising future for new and improved monolithic ceramic restorations, with combined durability and acceptable esthetics.
登录
查看更多内容
影响因子：
3.4
作者：
Gehrt, Maren;Wolfart, Stefan;Edelhoff, Daniel
通讯作者：
Edelhoff, Daniel
影响因子：
4.6
作者：
Kelly, J. Robert;Rungruanganunt, Patchnee;Vailati, Francesca
通讯作者：
Vailati, Francesca
影响因子：
2.7
作者：
Kim, JH;Miranda, P;Lawn, BR
通讯作者：
Lawn, BR
影响因子：
7.6
作者：
Kim, J.-W.;Kim, J.-H.;Zhang, Y.
通讯作者：
Zhang, Y.
DOI：
10.1002/jbm.b.31657
发表时间：
2010-08-01
影响因子：
3.4
作者：
Kim, Jae-Won;Liu, Lela;Zhang, Yu
通讯作者：
Zhang, Yu