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

全瓷修复体具有良好的生物相容性、优良的机械性能和美观的外观。在机械和光学性能方面，由氧化钇稳定的四方氧化锆(骨架材料)和瓷质(贴面材料)制成的修复体比任何可用的替代材料都更接近天然牙齿。由于全瓷修复体具有广泛的适应症，有可能取代金属烤瓷修复体成为标准治疗方法。到目前为止，陶瓷支架的失败率比传统的金属支架修复要高，这是因为组件之间的粘结强度较低。了解氧化钇稳定的四方氧化锆与瓷器之间的结合机制，有可能通过产生两种陶瓷的匹配亚表面性能来有针对性地改善牙齿折断。研究目的是研究全瓷修复体生产过程中的粘结机制和由制造链决定的失效机制。将评估组件材料性能对粘结强度的影响。在生产链之后，将确定生产过程对两个粘合伙伴的表面和亚表面性能的影响和相互作用。最后，构建了一个实证模型。在模型有效后，结果被转移到风格化修复。经验模型描述了基于材料性质和生产工艺参数的体系的粘结强度。遵循制造和加工策略将被调整，以增加全陶瓷修复体的寿命。

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.