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Optical Coherence Tomography Investigations and Modeling of the Sintering of Ceramic Crowns

机译:陶瓷冠烧结的光学相干层析成像研究与建模

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摘要

Dental prostheses are sintered in ovens that sometimes suffer from a loss of calibration. This can lead to variations of the sintering temperature outside the range recommended by the manufacturer. Stress and even fractures in dental ceramics may occur, and this leads to the necessity to rebuild the dental construct. The aim of this work is to monitor the quality of sintering processes using an established biomedical imaging technique—optical coherence tomography (OCT). Conventional current procedures imply the fabrication of supplemental samples that add to the expenses and are only evaluated visually. To our knowledge, we were the first to propose the use of OCT, a non-destructive method that brings objectivity for such assessments, focusing, in a previous study, on metal ceramic dental prostheses. Here, a different material, pressed ceramics, is considered, while we propose a quantitative assessment of the results—using reflectivity profiles of en-face (i.e., constant-depth) OCT images of sintered samples. The results for both the pressed ceramics and metal ceramics prostheses are discussed by obtaining the analytic functions of their reflectivity profiles. A multi-parametric analysis demonstrates the best parameter to characterize the loss of calibration of dental ovens. Rules-of-thumb are extracted; producing dental prostheses with defects can thus be avoided.
机译:牙科假体在烤箱中烧结,有时会失去校准能力。这可能导致烧结温度的变化超出制造商建议的范围。牙科陶瓷中可能会发生应力甚至断裂,这导致必须重建牙科结构。这项工作的目的是使用已建立的生物医学成像技术-光学相干断层扫描(OCT)监控烧结过程的质量。当前的常规程序意味着制造补充样品,这增加了费用并且仅在视觉上进行评估。据我们所知,我们是第一个提出使用OCT的人,OCT是一种非破坏性方法,为评估提供了客观性,在先前的研究中,重点放在金属陶瓷假牙上。在这里,我们考虑使用另一种材料,即压制陶瓷,同时我们建议对结果进行定量评估-使用烧结样品的正面(即恒定深度)OCT图像的反射率曲线。通过获得其反射率曲线的解析函数,讨论了压制陶瓷假体和金属陶瓷假体的结果。多参数分析显示了表征牙科烤箱校准损失的最佳参数。提取经验法则;因此可以避免产生具有缺陷的假牙。

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