Zirconia in fixed prosthesis. A literature review

Abstract

Statement of problem: Evidence is limited on the efficacy of zirconia-based fixed dental prostheses. Objective: To carry out a literature review of the behavior of zirconium oxide dental restorations. Material and Methods: This literature review searched the Pubmed, Scopus, Medline and Cochrane Library databases using key search words “zirconium oxide,” “zirconia,” “non-metal restorations,” “ceramic oxides,” “veneering ceramic,” “zirconia-based fixed dental prostheses”. Both in vivo and in vitro studies into zirconia-based prosthodontic restoration behavior were included. Results: Clinical studies have revealed a high rate of fracture for porcelain-veneered zirconia-based restorations that varies between 6% and 15% over a 3- to 5-year period, while for ceramo-metallic restorations the fracture rate ranges between 4 and 10% over ten years. These results provoke uncertainty as to the long-term prognosis for this material in the oral medium. The cause of veneering porcelain fractures is unknown but hypothetically they could be associated with bond failure between the veneer material and the zirconia sub-structure. Key words:Veneering ceramic, zirconia-based ceramic restoration, crown, zirconia, tooth-supported fixed prosthesis.

Clinical Evaluation and Patient Satisfaction of Single Zirconia‐Based and High‐Noble Alloy Porcelain‐Fused‐to‐Metal Crowns in the Esthetic Area: A Retrospective Cohort Study

“…This result agreed with a previous study based on 263 single crowns and 120 FPDs . In addition, a systematic review showed that the chipping rate for ZC crowns varied between 6% and 15% over a 3‐ to 5‐year period, although for HC crowns, it varied between 4% and 10% over 10 years . In this study, the chipping rate for ZC crowns was slightly higher, but the difference did not reach statistical difference ( p = 0.20); however, caution should be taken for clinicians to extrapolate this result to molar sites due to the limited number of included patients and low rate of veneer chipping in the esthetic area.…”

Hardware complications and failure of three‐unit zirconia‐based and porcelain‐fused‐metal implant‐supported fixed dental prostheses: a retrospective cohort study with up to 8 years

“…Among all restorative dental ceramic materials, zirconia shows the best mechanical properties (Agustin‐Panadero et al. ). This may explain the relative high survival rate of posterior implant‐supported fixed partial denture.…”

Veneered Zirconia‐Based Restorations Fracture Resistance Analysis

“…6 This chipping of the veneering layer is the primary concern in zirconia-based restorations. 1,3,[7][8][9] Many factors can cause the chipping of the veneering layer including the design of the zirconia core, support and thickness of the veneering layer, [9][10][11][12] the firing protocol, [13][14][15] surface treatment of the zirconia core, [16][17][18][19] the morphology of the circular finish line, 20 the adhesive forces between the core and veneering layer, 21 the mismatch of the coefficients of thermal expansion between the core and the veneering layer, 13,22 the type of the veneering layer ceramic, 23 and the zirconia veneering technique. 4,[23][24][25][26][27] The layering veneering technique has shown limitations such as lack of shade uniformity, formation of microbubbles, and varying skill of the dental technician.…”