Flexural strength and failure modes of layered ceramic structures.
Flexural strength and failure modes of layered ceramic structures.
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分层陶瓷结构的弯曲强度和故障模式。
DOI：
10.1016/j.dental.2011.09.008
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发表时间：
2011-12
期刊：
影响因子：
5
通讯作者：
Della Bona, Alvaro
中科院分区：
文献类型：
--
作者：
Borba, Marcia;de Araujo, Maico D.;de Lima, Erick;Yoshimura, Humberto N.;Cesar, Paulo F.;Griggs, Jason A.;Della Bona, Alvaro
为了评价试样设计对陶瓷结构抗弯强度（σf）和破坏模式的影响，验证了陶瓷材料受拉控制结构力学性能的假设。研究了三种固定局部义齿支架材料（YZ - Vita In-Ceram YZ; IZ - Vita In-Ceram Zirconia; AL - Vita In-Ceram AL）和两种贴面瓷（VM7和VM9）。条形标本以三种不同的设计（n=10）制作：单片，两层（瓷器-框架）和三层（TRI）（瓷器-框架-瓷器）。试件在37℃人工唾液中以1 MPa/s的速度进行三点抗弯强度测试。对于双层设计，试样在两种条件下进行了测试：瓷（PT）或框架陶瓷（FT）层在张力下。采用体视显微镜和扫描电镜对断口表面进行了分析。采用超声脉冲回波法测定杨氏模量(E)和泊松比（ν）。结果采用Kruskal-Wallis和Student-Newman-Keuls检验进行统计分析。除VM7和VM9外，各材料间的E值均有显著差异。YZ的ν值最高，z次之，AL次之，σf值最高。IZ与IZ- ft、AL与AL- ft的σf值差异无统计学意义。YZ-PT、IZ-PT、IZ-TRI、AL-PT、AL-TRI的σf值与VM7、VM9相似。确定了两种断裂模式：完全破坏和部分破坏。试件的力学性能由试验过程中材料受拉程度决定，证实了研究假设。
to evaluate the effect of the specimen design on the flexural strength (σf) and failure mode of ceramic structures, testing the hypothesis that the ceramic material under tension controls the mechanical performance of the structure. Three ceramics used as framework materials for fixed partial dentures (YZ - Vita In-Ceram YZ; IZ - Vita In-Ceram Zirconia; AL - Vita In-Ceram AL) and two veneering porcelains (VM7 and VM9) were studied. Bar-shaped specimens were produced in three different designs (n=10): monolithic, two layers (porcelain-framework) and three layers (TRI) (porcelain-framework-porcelain). Specimens were tested for three-point flexural strength at 1 MPa/s in 37°C artificial saliva. For bi-layered design, the specimens were tested in both conditions: with porcelain (PT) or framework ceramic (FT) layer under tension. Fracture surfaces were analyzed using stereomicroscope and scanning electron microscopy (SEM). Young’s modulus (E) and Poisson’s ratio (ν) were determined using ultrasonic pulse-echo method. Results were statistically analyzed by Kruskal-Wallis and Student-Newman-Keuls tests. Except for VM7 and VM9, significant differences were observed for E values among the materials. YZ showed the highest ν value followed by IZ and AL. YZ presented the highest σf. There was no statistical difference in the σf value between IZ and IZ-FT and between AL and AL-FT. σf values for YZ-PT, IZ-PT, IZ-TRI, AL-PT, AL-TRI were similar to the results obtained for VM7 and VM9. Two types of fracture mode were identified: total and partial failure. The mechanical performance of the specimens was determined by the material under tension during testing, confirming the study hypothesis.
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影响因子：
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作者：
Fleming, GJP;El-Lakwah, SFA;Marquis, PM
通讯作者：
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