Enlargement Zirconia Coefficient Or Shrinkage
Jul 24, 2019| The measurements of the final dental prosthesis must be known before milling the pre-sintered components.
Some machines use the multiplication (enlargement) coefficient, while others use shrinkage.
If the MULTIPLICATION COEFFICIENT method (enlargement coefficient) is used, each final measurement must be multiplied by this coefficient, specified for each lot.
If PERCENTAGE SHRINKAGE is used, the formula is:
[(pre-sint. - sint.) / (pre-sint.)]*100
(shrinkage of the pre-sintered product during sintering referred to the initial measurements of the pre-sintered product).
If this method is used, each measurement of the final prosthesis must therefore be multiplied by the following value:
100 /(100 – percentage shrinkage), specified for each lot.
The results obtained following one of the two methods indicate the dimensions which the pre-sintered prosthesis must have before being fired in the oven.
These values are based on the experience of Zotion Laboratory following various tests conducted considering machinability, density of the “green” (unsintered) product and final density.
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