In conclusion, the finish line configuration did not seem to affect the marginal and internal adaptation of PICN and lithium disilicate crowns. Using Mann-Whitney U test, the differences in IG for ‘material’ and ‘finish line’ were not found to be significant (P >. ANOVA revealed that the differences in marginal gap and absolute marginal discrepancies between the two materials was significant (P. The influence of material and finish line on the marginal and internal adaptation of crowns was assessed by analysing the data using two-way analysis of variance (ANOVA), non-parametric and Bon-ferroni multiple comparison post-hoc tests (α = 0.05). Marginal gap and absolute marginal discrepancies were evaluated at six pre-determined margin locations, and internal gap was measured at 60 designated points using a stereomicroscope-based digital image analysis system. 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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