Introduction: There is an increasing number of optical intraoral scanners (IOSs)
that are based on different scanning technologies; the choice of which may affect
clinical use. Aim: To investigate the marginal integrity and internal fit of CAD/CAM
ceramic crowns constructed using three different (IOSs)with one milling CAM unit.
Material & methods: 18 white epoxy resin dies were duplicated from a prepared
maxillary first premolar tooth and divided into groups A, B, and C (n=6). Group A
dies were scanned with Sirona Omnicam (IOS). Group B dies were scanned with Trios
3Shape (IOS), and group C dies were scanned with Emerald PlanScan (IOS). All dies
received standardized Emax CAD crowns milled by Inlab MC X5 milling machine
and were fired for crystallization and glazing in Programat p 310 ceramic furnaces.
Vertical marginal gaps were measured. All crowns were cemented using Theracem
resin cement. Internal fit was measured by sectioning half of the cemented crowns in a
bucco-lingual direction and the other half in a mesio-distal direction. Data analysis was
performed using 2way-ANOVA and paired t-test at 0.05 using IBM SPSS version 29.0.
Results: There was a statistically significant difference in mean vertical marginal
gap among the three groups (p < /span>≤0.05). The highest values were reported by Group < /p>
C followed by group B. The lowest values were reported by group A. The mean
internal gap of group C was significantly lower than other groups, while there was no
statistically significant difference between mean internal gap of group B & group A.
Conclusion: All tested (IOSs) proved to produce clinically acceptable ceramic
restorations in terms of marginal and internal adaptation. Difference of scanning
technologies of IOSs was found to affect significantly marginal and internal adaptation
of the CAD/CAM ceramic crowns.