The exceptional strength and appealing aesthetics of porcelain veneered yttria partially stabilised zirconia (YPSZ) dental prostheses, has led to the widespread adoption of these materials. However, near-interface chipping of the porcelain remains the primary failure mode. Advanced experimental techniques have recently revealed significant variations in residual stress and YPSZ phase distribution at the YPSZ–porcelain interface. Therefore, in order to improve existing understanding and effectively optimise the production of these devices, an enhanced model of the YPSZ coping that includes these newly discovered phenomena is presented in this study.

Macroscale stresses are shown to arise through the uneven temperatures within the coping during the sintering process and the coefficient of thermal expansion mismatch with the porcelain during veneering. In contrast, microscale stresses are driven by the YPSZ phase transformation and the associated volumetric expansion. The eigenstrain approach proposed here was found to demonstrate a good match between the phase variation determined experimentally, and the corresponding residual stress distribution showed an effective comparison with the empirical measurements. The proposed technique is a straightforward but powerful method for simulating this dominant mechanical behaviour, with significant potential to combine the resulting expressions into existing models. These enhanced simulations are the only viable approach for the precise, reliable and systematic optimisation of prosthesis production parameters that are needed to significantly reduce prosthesis failure rates.

瓷贴面氧化钇部分稳定的氧化锆（YPSZ）牙修复体的出色强度和引人入胜的美观性已导致这些材料的广泛采用。但是，瓷器的近界面碎裂仍然是主要的故障模式。先进的实验技术最近揭示了YPSZ-瓷界面处的残余应力和YPSZ相分布的显着变化。因此，为了增进现有的理解并有效地优化这些设备的生产，本研究提出了一种包含这些新发现现象的增强型YPSZ应对模型。

在烧结过程中，由于顶盖内部温度不均匀，在饰面期间，热膨胀系数与瓷不匹配，从而产生了宏观应力。相反，微观应力是由YPSZ相变和相关的体积膨胀驱动的。发现这里提出的特征应变方法证明了实验确定的相变之间的良好匹配，并且相应的残余应力分布显示出与经验测量值的有效比较。拟议的技术是一种简单但功能强大的方法，用于模拟这种主要的机械行为，具有将结果表达式组合到现有模型中的巨大潜力。这些增强的仿真是唯一可行的精确方法，