Krane M, Patyk A, Kobes L W
Department of Prosthodontics, Center and School of Dentistry, University of Göttingen, Germany.
J Prosthet Dent. 1998 Apr;79(4):389-92. doi: 10.1016/s0022-3913(98)70150-7.
When compared with waxes and prefabricated components made of dental alloys, processing resins is difficult and often results in a less accurate fit. The exact linear dimension is hard to realize, as the materials required for a dental casting are adjusted to dental waxes, and usually there are no special processing instructions for these resins.
The surface structure of 16 residue-free burning resins was determined to find which could enlarge the range of application for waxes in the dental casting technique.
A total of 480 specimens (30 castings for each of 16 resins) were marked with an individually cut pyramid, which left an impression in the resin. This was distinctly visible in the metal after casting in "the lost form." The surfaces of these 480 specimens were measured in three dimensions with a positioning aid "before casting in resin" and "after casting in metal" by the Perthometer micrometer. All specimens were treated identically by the lost-wax process by using the rotation symmetry of the muffle. The differences in the surface data before casting in resin and after casting in metal characterize the quality of the particular resin.
Surface roughness differed between the 16 resins in the range of micrometer.
With the dental casting technique, it is recommended that some resins replace waxes or wax-resin compositions.
与牙科合金制成的蜡和预制部件相比，加工树脂很困难，而且通常导致贴合度不够精确。由于牙科铸造所需的材料是根据牙科蜡调整的，并且通常没有针对这些树脂的特殊加工说明，因此很难实现精确的线性尺寸。
确定16种无残留燃烧树脂的表面结构，以找出哪些树脂可以扩大蜡在牙科铸造技术中的应用范围。
总共480个样本（16种树脂每种30个铸件）用单独切割的棱锥标记，棱锥在树脂上留下印记。在“失蜡铸造”后，这在金属中清晰可见。使用 Perthometer 测微仪，借助定位辅助工具在“树脂铸造前”和“金属铸造后”对这480个样本的表面进行三维测量。通过使用马弗炉的旋转对称性，所有样本均采用失蜡法进行相同处理。树脂铸造前和金属铸造后的表面数据差异表征了特定树脂的质量。
16种树脂的表面粗糙度在微米范围内有所不同。
对于牙科铸造技术，建议使用某些树脂替代蜡或蜡 - 树脂组合物。
