Investigastion of the bonding mechanisms between veneering and framework material of all-ceramic dental restorations

全瓷修复体具有优异的生物相容性、机械性能和美观的外观。关于机械和光学性能，由氧化钇稳定的四氧化锆（框架材料）和陶瓷（贴面材料）制成的修复体比任何可用的替代品都更接近天然牙齿。由于全瓷修复体适应症广泛，有可能取代金属陶瓷修复体成为标准治疗方法。到目前为止，由于组件之间的结合强度较低，陶瓷框架的失效率高于具有金属框架的传统组件。了解氧化钇稳定的四氧化锆和陶瓷之间的结合机制，有针对性地改善牙齿断裂的潜力，通过产生匹配的两种陶瓷的亚表面性能。本研究的目的是研究在生产全瓷双相陶瓷时，由制造链决定的粘结机制和失效机制。将评价组件材料特性对粘合强度的影响。在生产链之后，将确定生产过程对两种粘合伙伴的表面和次表面性质的影响和相互作用。最后，建立了一个实证模型。模型的有效性后，结果被转移到程式化的解释。该经验模型描述了基于材料特性和生产工艺参数的系统结合强度。遵循制造和机械加工策略将被调整以增加全陶瓷涂层的使用寿命。

All-ceramic dental prosthesis offers outstanding biocompatibility, excellent mechanical properties and aesthetic appearance. Regarding the mechanical and optical properties, a restoration made of yttria stabilized tetragonal zirconia (framework material) and porcelain (veneering material) matches the natural tooth closer than any available alternative. Due to the wide range of indications, all-ceramic restorations have the potential to replace metal-ceramic prosthesis as the standard therapy. So far, the failure rate of ceramic frameworks is higher compared to conventionell restorations with a metal framework, due to a lower bond strength between the components. Understanding the bonding mechanisms between yttria stabilized tetragonal zirconia and porcelain bears the potential for targeted improvement regarding tooth fracture by generating matched subsurface properties of both ceramics. The research objective is the investigation of the bonding mechanisms and the failure mechanisms determined by the manufacturing chain, while producing all-ceramic restorations. The influence of the components material properties on the bond strength will be evaluated. Following the chain of production, the effects and interactions of the production processes on the surface and subsurface properties of both bonding partners will be determined. Concluding, an empirical model is build. After validity of the model the results are transferred to stylized restorations. The empirical model describes the bond strength of the system based on material properties and parameters of the production process. Following the manufacturing and machining strategy will by adapted to increase the lifetime of all-ceramic restorations.