![]() The stone dies were scanned to produce virtual models, on which ceramic crowns were designed and milled, ten each for the four material-finish line combinations (n=10). Two master metal dies were used to create forty stone dies, twenty each for the two finish lines, shoulder and chamfer. A secondary aim was to assess the effect of finish line configuration on the fit accuracy of crowns made from the two materials. The aim of this in-vitro study was to evaluate the precision of fit of machined monolithic PICN single crowns in comparison to lithium disilicate crowns, in terms of marginal gap, internal gap, and absolute marginal discrepancies. A polymer infiltrated ceramic network (PICN) material has recently been introduced for dental use and evidence is developing on the fit accuracy of such crowns with different preparation designs.
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