Buso L, Oliveira-Júnior O B, Hiroshi Fujiy F, Leão Lombardo G H, Ramalho Sarmento H, Campos F, Assunção Souza R O
São Paulo State University, São José dos Campos, Brazil.
Minerva Stomatol. 2011 Jun;60(6):311-9.
Aim of the study was to evaluate the biaxial flexural strength of ceramics processed using the Cerec inLab system. The hypothesis was that the flexural strength would be influenced by the type of ceramic.
Ten samples (ISO 6872) of each ceramic (N.=50/n.=10) were made using Cerec inLab (software Cerec 3D) (Ø:15 mm, thickness: 1.2 mm). Three silica-based ceramics (Vita Mark II [VM], ProCad [PC] and e-max CAD ECAD]) and two yttria-stabilized tetragonal-zirconia-polycrystalline ceramics (Y-TZP) (e-max ZirCad [ZrCAD] and Vita In-Ceram 2000 YZ Cubes [VYZ]) were tested. The samples were finished with wet silicone carbide papers up to 1 200-grit and polished in a polishing machine with diamond paste (3 µm). The samples were then submitted to biaxial flexural strength testing in a universal testing machine (EMIC), 1 mm/min. The data (MPa) were analyzed using the Kruskal-Wallis and Dunn (5%) tests. Scanning electronic microscopy (SEM) was performed on a representative sample from each group.
The values (median, mean±sd) obtained for the experimental groups were: VM (101.7, 102.1±13.65 MPa), PC (165.2, 160±34.7 MPa), ECAD (437.2, 416.1±50.1 MPa), ZrCAD (804.2, 800.8±64.47 MPa) and VYZ (792.7, 807±100.7 MPa). The type of ceramic influenced the flexural strength values (P=0.0001). The ceramics ECADa, e-max ZrCADa and VYZa presented similar flexural strength values which were significantly higher than the other groups (PCb and VM IIb), which were similar statistically between them (Dunn's test). The hypothesis was accepted.
The polycrystalline ceramics (Y-TZP) should be material chosen for make FPDs because of their higher flexural strength values.
本研究的目的是评估使用Cerec inLab系统加工的陶瓷的双轴弯曲强度。假设是弯曲强度会受到陶瓷类型的影响。
使用Cerec inLab（软件Cerec 3D）制作每种陶瓷的10个样本（ISO 6872）（N = 50/n = 10）（直径：15毫米，厚度：1.2毫米）。测试了三种硅基陶瓷（Vita Mark II [VM]、ProCad [PC]和e-max CAD ECAD]）和两种氧化钇稳定的四方氧化锆多晶陶瓷（Y-TZP）（e-max ZirCad [ZrCAD]和Vita In-Ceram 2000 YZ Cubes [VYZ]）。样本用湿碳化硅砂纸打磨至1200目，并在抛光机中用金刚石膏（3微米）抛光。然后将样本在万能试验机（EMIC）中以1毫米/分钟的速度进行双轴弯曲强度测试。使用Kruskal-Wallis和Dunn（5%）检验分析数据（MPa）。对每组的一个代表性样本进行扫描电子显微镜（SEM）检查。
实验组获得的值（中位数、平均值±标准差）为：VM（101.7，102.1±13.65 MPa）、PC（165.2，160±34.7 MPa）、ECAD（437.2，416.1±50.1 MPa）、ZrCAD（804.2，800.8±64.47 MPa）和VYZ（792.7，807±100.7 MPa）。陶瓷类型影响弯曲强度值（P = 0.0001）。陶瓷ECADa、e-max ZrCADa和VYZa呈现出相似的弯曲强度值，显著高于其他组（PCb和VM IIb），这两组在统计学上相似（Dunn检验）。假设被接受。
由于其较高的弯曲强度值，多晶陶瓷（Y-TZP）应被选为制作固定局部义齿的材料。
