Reliability and mode of failure of bonded monolithic and multilayer ceramics. Issue 2 (February 2017)

• Record Type: Journal Article
• Authors: Alessandretti, Rodrigo; Borba, Marcia; Benetti, Paula; Corazza, Pedro Henrique; Ribeiro, Raissa; Della Bona, Alvaro
• Is Part Of: Dental materials. Volume 33:Issue 2(2017)
• Page Start: 191
• Page End: 197
• Publication Date: 2017-02
• Subjects: CAD/CAM -- Ceramic -- Multilayer structures -- Sound detection -- Fractography; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2016.11.014
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract: Objectives: To evaluate the reliability of monolithic and multilayer ceramic structures used in the CAD-on technique (Ivoclar), and the mode of failure produced in ceramic structures bonded to a dentin analog material (NEMA-G10). Methods: Ceramic specimens were fabricated as follows (n = 30): CAD-on- trilayer structure (IPS e.max ZirCAD/IPS e.max Crystall./Connect/IPS e.max CAD); YLD- bilayer structure (IPS e.max ZirCAD/IPS e.max Ceram); LDC- monolithic structure (IPS e.max CAD); and YZW- monolithic structure (Zenostar Zr Translucent). All ceramic specimens were bonded to G10 and subjected to compressive load in 37 °C distilled water until the sound of the first crack, monitored acoustically. Failure load (Lf ) values were recorded (N) and statistically analyzed using Weibull distribution, Kruskal–Wallis test, and Student-Newman–Keuls test ( α = 0.05). Results: Lf values of CAD-on and YZW structures were statistically similar (p = 0.917), but higher than YLD and LDC (p < 0.01). Weibull modulus ( m ) values were statistically similar for all experimental groups. Monolithic structures (LDC and YZW) failed from radial cracks. Failures in the CAD-on and YLD groups showed, predominantly, both radial and cone cracks. Significance: Monolithic zirconia (YZW) and CAD-on structures showed similar failure resistance and reliability, but a different fracture behavior.