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

全陶瓷义齿具有良好的生物相容性、优良的力学性能和美观的外观。在机械和光学性能方面，由氧化钇稳定的四边形氧化锆（框架材料）和瓷（贴面材料）制成的修复比任何可用的替代品都更接近天然牙齿。由于适应症广泛，全瓷修复体有可能取代金属-陶瓷修复体成为标准的治疗方法。到目前为止，陶瓷框架的故障率比传统的金属框架修复高，因为组件之间的结合强度较低。了解氧化钇稳定的四方氧化锆和瓷器之间的键合机制，可以通过产生匹配的两种陶瓷的表面下性能来有针对性地改善牙齿断裂。研究目的是在生产全陶瓷修复体时，研究由制造链决定的键合机制和破坏机制。评估组件材料性能对结合强度的影响。在生产链之后，将确定生产过程对两个键合伙伴的表面和地下性质的影响和相互作用。最后，建立了实证模型。模型验证后，将结果转换为程式化恢复。经验模型根据材料性能和生产工艺参数描述了体系的结合强度。接下来的制造和加工策略将被调整，以增加全陶瓷修复体的使用寿命。

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.