Graded structures for damage resistant and aesthetic all-ceramic restorations.
Graded structures for damage resistant and aesthetic all-ceramic restorations.
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DOI：
10.1016/j.dental.2009.01.002
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发表时间：
2009-06
期刊：
影响因子：
5
通讯作者：
Kim, Jae-Won
中科院分区：
文献类型：
--
作者：
Zhang, Yu;Kim, Jae-Won
临床研究揭示了氧化铝和氧化锆基全瓷修复体的几个性能缺陷：断裂；陶瓷核(特别是氧化锆核)的美学性能较差；难以实现陶瓷-树脂基牙本质的牢固粘结。我们的目标是通过开发一种功能梯度玻璃/氧化锆/玻璃(G/Z/G)结构来解决这些问题，该结构具有更好的抗损性、美观性和粘结性能。利用本实验室研制的玻璃粉组合物和市售氧化锆粉，我们成功地制备了功能梯度的G/Z/G结构。用扫描电子显微镜(SEM)观察了G/Z/G的显微组织。用X射线衍射仪对G/Z/G中的晶相进行了鉴定。利用纳米压痕的方法计算了G/Z/G的杨氏模量和硬度。通过球形压头加载，确定了粘结在聚碳酸酯基材上的G/Z/G板(厚度分别为20×20mm2、1.5 mm和0.4 mm)的胶结断裂临界载荷。在均相Y-TZP对照上进行了平行研究。G/Z/G结构由外表面美观的玻璃层、梯度玻璃-Y-TZP层和致密的Y-TZP内部组成。杨氏模量和硬度从表面到内部按幂函数关系递增。对于1.5 mm和0.4 mm厚的G/Z/G接骨板，骨水泥断裂的临界载荷分别为1990±107N(平均±SD，n=6)和227±20N(平均±SD，n=6)，分别比单块Y-TZP钢板(1.5 mm和0.4 mm厚分别为1388±90N和113±10N；平均±SD，n=6)分别高出约30%和50%。单样本t检验表明，G/Z/G和均匀Y-TZP两种试件厚度的径向断裂的临界载荷有显著差异(p<；0.001)。我们的结果表明，与均匀的Y-TZP相比，功能梯度的G/Z/G结构具有更好的抗损性、美观性和潜在的胶凝性能。
Clinical studies revealed several performance deficiencies with alumina- and zirconia-based all-ceramic restorations: fracture; poor aesthetic properties of ceramic cores (particularly zirconia cores); and difficulty in achieving a strong ceramic–resin-based cement bond. We aim to address these issues by developing a functionally graded glass/zirconia/glass (G/Z/G) structure with improved damage resistance, aesthetics, and cementation properties. Using a glass powder composition developed in our laboratory and a commercial fine zirconia powder, we have successfully fabricated functionally graded G/Z/G structures. The microstructures of G/Z/G were examined utilizing a scanning electron microscopy (SEM). The crystalline phases present in G/Z/G were identified by X-ray diffraction (XRD). Young’s modulus and hardness of G/Z/G were derived from nanoindentations. Critical loads for cementation radial fracture in G/Z/G plates (20×20 mm2, 1.5 or 0.4 mm thick) bonded to polycarbonate substrates were determined by loading with a spherical indenter. Parallel studies were conducted on homogeneous Y-TZP controls. The G/Z/G structure consists of an outer surface aesthetic glass layer, a graded glass-Y-TZP layer, and a dense Y-TZP interior. The Young’s modulus and hardness increase from surface to interior following power-law relations. For G/Z/G plates of 1.5 and 0.4 mm thick, critical loads for cementation radial fracture were 1990±107 N (mean±SD, n = 6) and 227±20 N (mean±SD, n = 6) respectively, which were ~30% and 50% higher than those for their monolithic Y-TZP counterparts (1388±90 N for 1.5 mm and 113±10 N for 0.4 mm thick; mean±SD, n = 6 for each thickness). A 1-sample t-test revealed significant difference (p < 0.001) in critical loads for radial fracture of G/Z/G and homogeneous Y-TZP for both specimen thicknesses. Our results indicate that functionally graded G/Z/G structures exhibit improved damage resistance, aesthetics, and potentially cementation properties compared to homogeneous Y-TZP.
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DOI：
10.1111/j.1151-2916.1998.tb02625.x
发表时间：
1998-09-01
影响因子：
3.9
作者：
Jitcharoen, J;Padture, NP;Suresh, S
通讯作者：
Suresh, S
影响因子：
5
作者：
Sundh, A;Molin, M;Sjögren, G
通讯作者：
Sjögren, G
影响因子：
9.4
作者：
Suresh, S;Olsson, M;Jitcharoen, J
通讯作者：
Jitcharoen, J
影响因子：
2.9
作者：
von Steyern, P. Vult;Ebbesson, S.;Nilner, K.
通讯作者：
Nilner, K.
影响因子：
7.6
作者：
Krejci, I;Albert, P;Lutz, F
通讯作者：
Lutz, F