Texas Tech University Health Sciences Center El Paso, Woody L. Hunt School of Dental Medicine.
Colegio Odontologico de Jalisco.
Dent Mater J. 2022 Oct 2;41(5):705-709. doi: 10.4012/dmj.2022-018. Epub 2022 Jul 6.
This study uses fracture tests and fractographical analysis to compare computer-aided design and computer-aided manufacturing (CAD/CAM) lithium disilicate molar crowns with the previous occlusal thickness recommendation of 1.5-mm, the new recommendation of 1.0-mm, and a less invasive thickness of 0.8-mm. After fatigue application, fracture tests and fractographic analysis were conducted. The fracture resistance of CAD/CAM lithium disilicate molar crowns was different depending on the occlusal thickness of the restoration, and decreased with lower the thickness. However, the fracture resistance of crowns of all three thicknesses exceeded the reported maximum bite force in the first molar region after the fatigue process, and can be considered acceptable for use in the clinic.
本研究采用断裂试验和断口分析，比较了计算机辅助设计和计算机辅助制造（CAD/CAM）的二硅酸锂磨牙冠与之前推荐的 1.5mm 牙合面厚度、新推荐的 1.0mm 牙合面厚度和更微创的 0.8mm 牙合面厚度。在疲劳应用后，进行了断裂试验和断口分析。CAD/CAM 二硅酸锂磨牙冠的断裂阻力取决于修复体的牙合面厚度，厚度越低，断裂阻力越低。然而，三种厚度的冠在疲劳过程后，其断裂阻力均超过了第一磨牙区域报道的最大咬合力，可以认为在临床上是可以接受的。
