Burnett C A, Maguire H
Division of Restorative Dentistry, School of Clinical Dentistry, Queen's University of Belfast, UK.
J Dent. 1996 Jan-Mar;24(1-2):99-103. doi: 10.1016/0300-5712(95)00050-x.
Correct sprue design is a major factor in the reduction of defects in castings of cobalt-chromium alloy. The purpose of this study was to investigate the sprue arrangements decided by a group of dental technicians, for a series of proposed removable partial denture castings, in order to determine if there was any consistency between them which would suggest the application of criteria in their design.
Information was gathered by postal inquiry with recipients asked to indicate their sprue designs on diagrams of patterns for proposed cobalt-chromium partial denture castings.
Replies were received for 260 proposed castings from dental schools, technical colleges and commercial laboratories which gave an overall response rate of 52%. Results displayed a wide range of responses in relation to sprue number and dimension, attachment site and the intended direction of metal flow.
It was concluded that the group of technicians studied arbitrarily chose sprue arrangements for the castings proposed rather than following definite design criteria that seek to minimize potential problems during casting procedures.
正确的铸道设计是减少钴铬合金铸件缺陷的主要因素。本研究的目的是调查一组牙科技术人员为一系列拟议的可摘局部义齿铸件所确定的铸道布置，以确定他们之间是否存在任何一致性，从而表明在其设计中应用标准。
通过邮政询问收集信息，要求收件人在拟议的钴铬局部义齿铸件模型图上标明他们的铸道设计。
收到了来自牙科学校、技术学院和商业实验室对260个拟议铸件的回复，总体回复率为52%。结果显示，在铸道数量和尺寸、附着部位以及金属流动的预期方向方面，回复范围广泛。
得出的结论是，所研究的技术人员群体为拟议的铸件任意选择铸道布置，而不是遵循旨在尽量减少铸造过程中潜在问题的明确设计标准。
