Marginal Integrity of Different CAD/CAM Monolithic Ceramic Crowns with Vertical and Horizontal Finish Line Preparations

Document Type : Original Article

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Associate Professor, Fixed Prosthodontics, Faculty of Dentistry, October 6 University, Giza, Egypt

Abstract

Purpose: Evaluate the marginal fit of different monolithic ceramic crowns for prepared teeth with vertical and horizontal finish lines.
Materials & Methods: Sixty monolithic ceramic crowns were fabricated, divided equally into two groups: vertical finish line preparation design (VFL) and horizontal finish line preparation design (HFL). Each group was divided according to the utilized ceramic material into three subgroups (n=10). Subgroup {CZI}: Zirconia (Ceramill Zolid), subgroup {VE}: Hybrid ceramic (Vita Enamic) and subgroup {CD}: Zirconia reinforced Lithium Silicate (Celtra Duo). Vertical gaps of all ceramic crowns were measured at 20 predetermined points without cementation.
Results: All marginal gap results lied within the clinically acceptable range. {VFL} Group: {VE}subgroup showed the lowest mean marginal gap followed by {CZI} then {CD}subgroups with statistically significant difference between {VE}&{CD}subgroups. {CZI} showed a non-significant difference with and {VE} and {CD} subgroups. {HFL} Group: {VE}subgroup showed the lowest mean marginal gap value followed by {CD} then {CZI}with a statistically significant difference between the three subgroups. All {VFL}, subgroups showed significantly higher marginal gaps compared to their corresponding subgroups in the {HFL} group.
Conclusions: Both finish line preparations offered clinically acceptable marginal gaps for the 3 ceramic materials used, although each material presented significantly different marginal gaps with both preparations.

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Egyptian Dental Journal
Volume 70, Issue 2 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
April 2024
Pages 1761-1759

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