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Standards Development
This document specifies a test method for the calibration of resistanceheated high temperature sintering furnaces that are suitable for the sintering of dental restorations in the temperature range up to 1 700 °C.
High temperature sintering furnaces are used for sintering restorations made from oxide ceramics and from sintered metal in dentistry. Significantly higher temperatures than those for firing dental ceramic masses containing silicates are necessary here. Zirconium oxide (ZrO2) is typically sintered at a temperature of up to 1 700 °C.
The sintering temperature is of vital importance for the properties of the sintered material. Too high a sintering temperature generally results in a larger grain size. Too low a sintering temperature results in an inadequate sintering quality and possibly residual porosity.
Incorrect sintering temperatures can result in low strength, discrepant colouration or low ageing resistance. Furthermore, a poor accuracy of fit owing to excessively low or uneven shrinkage may occur.
Too high temperatures can lead to a softening and consequently a deformation of the restoration.
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https://connect.iso.org/pages/viewpage.action?pageId=27590861
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