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首页> 外文会议>Congress of the World Federation for Laser Dentistry >OCT and shear-force evaluations of Zirconia Fixed Partial Prosthesis processed with a conventional CAD/CAM technology
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OCT and shear-force evaluations of Zirconia Fixed Partial Prosthesis processed with a conventional CAD/CAM technology

机译：OCT和抗剪切力评估氧化锆固定的部分假体用传统的CAD / CAM技术处理

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Introduction. Dental ceramics show better biocompatibility and aesthetic properties in dental constructs with regard to metals. However, they also have an insufficient mechanical stability, as well as low resistance limits due to their fragility. Taking into account these aspects, glass infiltrated with ceramic materials such as alumina (i.e., zirconia-reinforced ceramics) is being nowadays considered a better material for full fixed partial prostheses (FPPs) than ceramics: the former has a higher mechanical resistance, which makes it more appropriate for restoration areas, where there is an increased mechanical stress. The interest for zirconia is growing due both to its resistance and to the possibility to develop such prostheses using the CAD/CAM technology. Materials and methods. 24 all ceramic FPPs created with CAD/CAM technology were used. The models were scanned with Zeno Wieland Scanner, a one touch scanning machine which requires between 45-60 s for a full model scan. The scanner provides 3 axis-architecture and automatic data processing. The zirconia infrastructures resulted from milling zirconia green disks in Wieland units, followed by the deposition of ceramic masses and then by burning procedures. All the samples were assessed with a Time Domain Optical Coherence Tomography (TD-OCT) system working at a wavelenght of 1300 nm. Using OCT investigations, material defects were detected in the areas of maximal tension, i.e. the connectors, the oclusal, and the cervical areas. These samples with defects in the above areas have not been considered for the study further on. Finally, the samples were loaded in a MultiTest 5 i Mecmesin system and tested until fracture occurred. The MultiTest 5-i creates tensile and compression forces of up to 5 kN. Results and discussions. All the test samples survived a dynamic load of 1.2 × 107 cycles and a thermal cycle mixer simulator version; signs of failure in terms of fracture lines were observed in all samples. The average value of the force necessary to break the FPPs obtained from the tests is 1750 N. Conclusions. Conventional metal-ceramic fixed partial dentures are still considered the standard for edentulous spaces in the posterior region. Therefore, the resistance of metal-ceramic fixed partial dentures has served in this study as a guide for new ceramics tests. All the values from this study conducted in FPP with zirconia frames were much lower than the values reported for metal ceramic fixed partial dentures (i.e., 2500-3000 N), but higher that 1000 N, which is considered the lowest resistance point to be utilized in the rear region of the oral cavity.
机译：介绍。牙科陶瓷在金属方面表现出牙科结构中的更好的生物相容性和美学性质。然而，它们也具有不足的机械稳定性，并且由于其脆弱而导致的低电阻限制。考虑到这些方面，用陶瓷材料（即氧化铝增强陶瓷等陶瓷材料（即氧化锆增强陶瓷）渗透的玻璃被认为是完全固定的部分假体（FPP）的更好的材料，而不是陶瓷：前者具有更高的机械抗性，这使得更适合恢复区域，在那里有增加的机械应力。氧化锆的兴趣由于其抵抗力和可能使用CAD / CAM技术开发这种假体的可能性而增长。材料和方法。 24使用了使用CAD / CAM技术创建的所有陶瓷FPP。使用Zeno Wieland Scanner扫描模型，这是一个触摸扫描机，需要45-60秒以进行全模型扫描。扫描仪提供3轴架构和自动数据处理。氧化锆基础设施由米兰机组碾磨氧化锆绿盘，其次是陶瓷质量沉积，然后通过燃烧程序。用时间域光学相干断层扫描（TD-OCT）系统在1300nm的波兰人工作中评估所有样品。使用OCT调查，在最大张力的区域中检测到材料缺陷，即连接器，Oclusal和宫颈区域。这些样品在上述区域中没有考虑进一步考虑研究。最后，将样品加载到Mulitest 5 I Mecmesin系统中并测试直至发生骨折。 MultiTest 5-I产生高达5 kN的拉伸和压缩力。结果和讨论。所有测试样品均存在1.2×107周期的动态负载和热循环混合器模拟器版本;在所有样品中观察到在骨折线方面失败的迹象。打破试验中获得的FPP所需的力的平均值为1750 n。结论。常规的金属陶瓷固定部分假牙仍被认为是后部区域中的透明空间的标准。因此，本研究中的金属陶瓷固定部分假牙的抗性作为新陶瓷测试的指导。通过氧化锆框架的FPP中进行该研究的所有值远低于金属陶瓷固定部分假牙（即2500-3000n）所报告的值，但是1000 n的值较高，这被认为是要使用的最低电阻点在口腔的后部区域。

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