CLINICAL SCIENCE

Clinical study to evaluate the wear of natural enamel antagonist to zirconia and metal ceramic crowns Kailas Mundhe, MDS,a Veena Jain, MDS,b Gunjan Pruthi, MDS,c and Naseem Shah, MDSd Different materials, including ABSTRACT metal, metal ceramic, and ceStatement of problem. Tooth wear is a complex process, which, if not prevented, may adversely ramic, are used to fabricate affect the integrity of the stomatognathic system. Different restorative dental materials may affect extracoronal restorations.1 In the amount of wear on natural enamel antagonists. the past, ceramic crowns had Purpose. The purpose of this in vivo study was to evaluate and compare the wear of enamel inferior tensile strength, hardopposing natural enamel, zirconia, and metal ceramic crowns after 1 year. ness, brittleness, and resisMaterial and methods. Ten participants between 18 and 35 years of age requiring 2 complete tance to fracture than a metal crowns, 1 on either side of maxillary or mandibular molar region, and having healthy natural teeth ceramic crown.2 Recent dein the opposing arch were selected. For each participant, 1 monolithic polished zirconia crown and velopments have led to ceramic 1 glazed metal ceramic crown were fabricated and cemented. To evaluate the wear of the restorations with improved antagonistic natural enamel (premolar and molar), polyvinyl siloxane impressions were made properties.3 New low-fusing immediately (baseline) and at 1 year after cementation. The wear of natural enamel against natural enamel was evaluated as the control. The resulting casts were scanned (using a 3D white light ceramic materials are reported scanner), and 3D software was used to calculate the maximum amount of linear wear. to be more wear-friendly because of their lower hardness, Results. One-way repeated measures ANOVA was conducted to analyze data. Mean ±SD occlusal lower concentrations of crystal wear of the antagonistic enamel 1 year after the cementation of metal ceramic crowns was 69.20 ±4.10 mm for premolar teeth and 179.70 ±8.09 mm for molar teeth, whereas for zirconia crowns, it phase, and smaller crystal was 42.10 ±4.30 mm for premolar teeth and 127.00 ±5.03 mm for molar teeth. Occlusal wear of size.4,5 natural enamel opposing natural enamel was 17.30 ±1.88 mm in the premolar region and 35.10 Zirconia, one of the more ±2.60 mm in the molar region. The Bonferroni post hoc test revealed that the occlusal wear of recently introduced materials antagonistic enamel 1 year after the cementation of a metal ceramic crown was significantly higher is a crystalline dioxide of zir(P

Clinical study to evaluate the wear of natural enamel antagonist to zirconia and metal ceramic crowns.

Tooth wear is a complex process, which, if not prevented, may adversely affect the integrity of the stomatognathic system. Different restorative denta...
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