Rashidi Tabish, Bhasin Navreet, Bumb Pratik P, Singh Amitu, Pawar Shubhra J, Priyadarshi Siddharth
Department of Prosthodontics, Dr. Rajesh Ramdasji Kambe Dental College and Hospital, Akola, Maharashtra, India.
Department of Prosthodontics Including Crown and Bridge, Surendera Dental College and Research Institute, Sri Ganganagar, Rajasthan, India.
J Pharm Bioallied Sci. 2022 Jul;14(Suppl 1):S825-S828. doi: 10.4103/jpbs.jpbs_10_22. Epub 2022 Jul 13.
It is important to construct the sprue in a way that ensures that the mold gets an appropriate supply of metal at the right speed. Many manufacturers now offer sprue designs that have not been advocated in textbooks or publications for their normal use.
The goal of this research was to compare the sprue design's marginal fit to that of the other designs.
During this investigation, we attempted to see whether the fabrication of metal copings could be improved. Three sprue designs were used in this research for the assessment of casting accuracy: normal cylindrical, funnel-shaped, and cuboidal or flattened sprue forms.
The mean marginal disparity of nickel-chromium (Ni-Cr) alloy copings made by three distinct brands was determined to be statistically insignificant.
Within the limitation of the study, it was concluded that the marginal accuracy of metal copings fabricated with three different brands of Ni-Cr alloy did not reveal a statistically significant result. However, out of the three different sprue designs, that is, cylindrical, cuboidal, and funnel shape, the marginal accuracy of cylindrical and cuboidal sprue designs was found to be better than that of the funnel shape sprue design because the funnel shape sprue design is narrow at the point of attachment, thereby increasing the flow pressure and decreasing the turbulence of the molten metal.
以确保铸模以合适的速度获得适量金属供应的方式构建浇道很重要。现在许多制造商提供的浇道设计在教科书或出版物中并未被提倡用于常规用途。
本研究的目标是比较浇道设计与其他设计的边缘适合性。
在本次调查中，我们试图了解金属冠的制作是否可以得到改进。本研究使用了三种浇道设计来评估铸造精度：普通圆柱形、漏斗形以及长方体或扁平形浇道形式。
由三个不同品牌制作的镍铬（Ni-Cr）合金冠的平均边缘差异在统计学上无显著意义。
在该研究的局限性范围内，得出的结论是，用三种不同品牌的Ni-Cr合金制作的金属冠的边缘精度未显示出统计学上的显著结果。然而，在三种不同的浇道设计中，即圆柱形、长方体形和漏斗形，发现圆柱形和长方体形浇道设计的边缘精度优于漏斗形浇道设计，因为漏斗形浇道设计在连接点处较窄，从而增加了流动压力并减少了熔融金属的湍流。
