Abstract
Purpose: The purpose of this study was to compare the marginal and internal fit of three-unit fixed
dental prostheses (FDPs) fabricated using CAD/CAM with two designs, two cement space (CS), and two
zirconia types.
Methods: A master model with two zirconia abutments and a missing tooth was scanned with an intraoral scanner. FDPs were fabricated with two designs (Full contour: FC, Framework: FW), two zirconia
types (multi-layer: L, single-layer: W), and two CS values (30 and 45 μm for L and 30 μm for W). There
were six experimental groups. The fit of the FDPs was evaluated using the replica method. The space
between an abutment and the FDPs in the marginal (MO), chamfer (CH), axial (AX), and occlusal (OC)
areas was measured under an optical microscope and the data was statistically analyzed using three-way
ANOVA and Bonferroni test (p < 0.05).
Results: FW-l-45 μm showed a significantly smaller space than those for the FC in MO (p = 0.011), CH
(p = 0.001) and AXE (p = 0.003). FW-l-30 μm showed a significantly smaller space than that for the
45 μm in AXE (p = 0.000) and OC (p = 0.016). FW-W-30 μm showed a significantly smaller space than
that for the L in MO (p = 0.000), CH (p = 0.000), AXE (p = 0.000), and OC (p = 0.002).
Conclusions: The design and CS of the FDPs affected the fit. FDPs with single-layer zirconia showed
better fit than that obtained with multi-layer zirconia.
