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)
Journal Title: World Journal of Pharmaceutical Research - Year 2017, Vol 6, Issue 10
Abstract
Background: Marginal fitness is an important factor in success and longevity of implant – retained restoration. Poor fitness and too large discrepancy lead to seepage of debris, cement dissolution and microbial colonization which lead to peri- implant inflammation and failure of implant 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 zirconia crowns using CORETIC 250i (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 better marginal fit and showed smaller marginal gap compare with metal ceramic crowns and veneered zirconia crowns.
Authors and Affiliations
Inas K. Mohammed and Asst. Prof. , Dr. Sabiha M. Kanaan
Keywords
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