Effect of vertical preparation on fit of heat pressed zirconia reinforced lithium disilicate and monolithic zirconia three-unit fixed partial dentures: A comparative study

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Abstract Background: The aim of this study was to evaluate the effect of horizontal and vertical tooth preparation on the internal and marginal fit of zirconia reinforced lithium silicate and monolithic zirconia fixed partial dentures.Methods: Forty ceramic fixed partial dentures were divided into four groups (n=10) according to ceramic type and finish line design. Group HL: Horizontal tooth preparation with heat pressed zirconia reinforced lithium disilicate. Group HZ: Horizontal tooth preparation with zirconia fixed partial denture. Group VL: Vertical tooth preparation with heat pressed zirconia reinforced lithium disilicate fixed partial denture. Group: VZ: Vertical tooth preparation with zirconia fixed partial denture. Micro-CT was used to evaluate the fit of each fixed partial denture. Data were collected and statistically analyzed.Results: Horizontal preparation showed a significant better fit than that of vertical preparation for both abutments (P˂.001). Zirconia showed significant better fit than heat pressed zirconia reinforced lithium disilicate for the posterior abutment. All the results were within internal and marginal fit requirements.Conclusions: Nevertheless, being within the clinically acceptable fit values, the vertical preparation can negatively affect the marginal gap and internal fit of fixed partial dentures at certain points. The marginal gap and internal fit of the ceramic fixed partial dentures can be affected by ceramic type and finish line design.

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