Abstract

COMPARATIVE STUDY OF VERTICAL MARGINAL FIT ON IMPLANT ABUTMENT USING METAL CERAMIC CROWNS, FULL CONTOUR ZIRCONIA CROWNS (CAD/CAM) AND VENEERED ZIRCONIA CROWNS (CAD/CAM) (AN IN VITRO STUDY)

Inas K. Mohammed and Dr. Sabiha Mahdi Kanaan*

Abstract

Background: Marginal fitness is an important factor in success and longevity of implant – retained restoration.) Objective: To evaluate and compare vertical marginal fit among three materials used in construction crowns in the dental implant (metal- ceramic- full contour zirconia- veneered zirconia crowns. Material and method:- Four implant abutment on maxillary cast with first premolar and first molar (right & left )on both side receive thirty crowns on were divided into three group :- Group A:-10 samples were constructed with metal ceramic crowns used lost wax technique. Group B:-10 samples were constructed with full-contour zirconia crowns used (Imes –Icore) CAD-CAM system. Group C:-10 samples were constructed with veneered zirconia crowns used (Imes –Icore) CAD-CAM system. Vertical marginal gaps were measured at four points on each tooth surface. Sixteen points per tooth sample were measured using a digital microscope at a magnification of (230X). The marginal discrepancy found by use the mean of this sixteen points the Comparison of significance among the different groups using (Kruskal- Wallis H) test showed a statistically highly significant differences (p < 0.000). Furthermore, comparison of significance between each pair of groups using Paired-Samples, (Mann- Whitney U) showed statistically highly significant differences (p < 0.000). Results: The results of this study revealed that the least marginal gaps were, recorded at full contour zirconiaa crowns using (Imes –Icore) CAD-CAM system (39,239 -+26,575 um) and highest marginal gap were recorded at metal ceramic crowns using lost wax technique (92,513- +32,466 um) and veneered zirconia crowns were between of them (68,433-+40, 346 um). In conclusion, full contour zirconia crowns constructed with CAD-CAM system provided butter marginal fit and showed smaller marginal gap compare with metal ceramic crowns and veneered zirconia crowns.

Keywords: Implant Abutment, Metal Ceramic, Zirconia.