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

Volume 6 , Issue 1 , June 2019 , Pages 29-32

Authors

Bassam K. Amin 1

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

DOI logo 10.17656/sdj.10087

Keywords

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 materials.
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. 

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