sdj-10087

Comparative Study of Marginal Gap Among Zirconium Dioxide, Poly Ethyl Ethyl Ketone and Porcelain Fused to Metal Implant Supported Crowns

* Bassam K. Amin

*Department of Conservative Dentistry, College of Dentistry, Hawler Medical University, Erbil, Iraq.

Submitted: 14/01/2019; Accepted: 23/04/2019; Published 01/06/2019

DOI: https://doi.org/10.17656/sdj.10087

Abstract

Objective: Lifetime and clinical success of implant-supported crown are critically affected by the marginal gap. Marginal misfit may lead to microleakage, cement dissolution accumulation of bacteria, food, and oral debris, potentially causing gingival inflammation and peri-implantitis. The objective of this in vitro study was to compare the marginal gap of crowns made from three different materialsn.

Methods: A shouldered implant abutment was screwed to implant analog and scanned. Computer Aided Design-Computer Aided Manufacturing ( CAD/CAM ) was used to design crown. Zirconium dioxide, Poly ethyl ethyl ketone and porcelain fused to metal were used as materials to fabricate six crowns from each one respectively. Marginal gaps were measured by stereomicroscope at five points for all samples, measurements were recorded using Adobe Photoshop CC 2017 software, and the data were statistically analyzed and subjected to one-way ANOVA and Scheffe post hoc tests (p = 0.05).

Results: Mean marginal gaps of Zirconia crown were (786 +/- 794 μm) and for porcelain fused to metal were (883+/- 371μm), both groups were significantly different from Poly Ethyl ethyl ketone (2000 +/-1026 μm) group, but there was no significant difference between Zirconium dioxide and porcelain fused to metal.

Conclusions: Within the limitations of this study, it was concluded that although the marginal gaps of the studied implant-supported restorations were in the clinically acceptable range, crowns made from Zirconia provide less marginal gap followed by porcelain fused to the metal crown while PEEK material had the largest gap.

Keywords: Marginal Gap, CAD/CAM, Implant supported crowns Full Article - PDF

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