School of Dentistry (DOD), Division of Prosthodontics, Universidade Federal do Rio Grande do Norte -UFRN, 59056-000, Natal, Brazil.
Materials Engineering Department, Universidade Federal do Rio Grande do Norte - UFRN, Natal, Brazil.
Mater Sci Eng C Mater Biol Appl. 2014 May 1;38:79-84. doi: 10.1016/j.msec.2014.01.032. Epub 2014 Jan 24.
The purpose of this work was to evaluate the interaction of different layering porcelains with zirconia via shear bond strength test and microscopy. Four different groups of dental veneering porcelains (VM9, Zirkonzanh, Ceramco, IPS) were fused onto forty zirconia-based cylindrical substrates (8mm in diameter and 12 mm in height) (n=10), according to the manufacturer's recommendations. Additionally, layered dental porcelain (D-sign, Ivoclar) was fired on ten Ni-Cr cylindrical substrates Shear bond strength tests of the veneering porcelain to zirconia or Ni-Cr were carried out at a crosshead speed of 0.5mm/min. After the shear bond tests, the interfaces were analyzed by scanning electron microscopy (SEM). The fracture type exhibited by the different systems was also assessed. The results were statistically analyzed by ANOVA at a significant level of p<.05. The shear bond strength values of the porcelain-to-NiCr interfaces (25.3±7.1 MPa) were significantly higher than those recorded for the following porcelain-to-zirconia systems: Zirkonzanh (18.8±1 MPa), Ceramco (18.2±4.7 MPa), and IPS (16±4.5 MPa). However, no significant differences were found in the shear bond strength values between the porcelain-to-NiCr and porcelain (VM9)-to-zirconia (23.2±5.1 MPa) groups (p>.05). All-ceramic interfaces revealed mixed failure type, cohesive in the porcelain and adhesive at the interface. This study demonstrated that all-ceramic systems do not attain yet the same bond strength standards equivalent to metal-ceramic systems. Therefore, despite the esthetic appeal of all-ceramic restorations, the adhesion between the porcelain and zirconia framework is still an issue considering the long term success of the restoration.
本研究旨在通过剪切结合强度测试和显微镜观察评估不同层压瓷与氧化锆的相互作用。根据制造商的建议，将四种不同类型的牙科贴面瓷（VM9、Zirkonzanh、Ceramco、IPS）熔合到四十个氧化锆基圆柱形基底（直径 8mm，高度 12mm）上（n=10）。此外，将分层牙科瓷（D-sign、Ivoclar）烧制在十个 Ni-Cr 圆柱形基底上。以 0.5mm/min 的十字头速度对贴面瓷与氧化锆或 Ni-Cr 的剪切结合强度进行测试。剪切结合强度测试后，通过扫描电子显微镜（SEM）分析界面。还评估了不同系统表现出的断裂类型。使用方差分析（ANOVA）对结果进行统计分析，显著水平为 p<.05。瓷与 Ni-Cr 界面的剪切结合强度值（25.3±7.1 MPa）明显高于以下瓷与氧化锆系统的记录值：Zirkonzanh（18.8±1 MPa）、Ceramco（18.2±4.7 MPa）和 IPS（16±4.5 MPa）。然而，瓷与 Ni-Cr 和瓷（VM9）与氧化锆（23.2±5.1 MPa）之间的剪切结合强度值没有发现显著差异（p>.05）。全瓷界面显示混合失效类型，瓷内为内聚性，界面为黏附性。本研究表明，全陶瓷系统尚未达到与金属陶瓷系统相当的相同结合强度标准。因此，尽管全瓷修复体具有美学吸引力，但考虑到修复体的长期成功，瓷与氧化锆基底之间的粘附仍然是一个问题。
