Effect of cements on fracture resistance of monolithic zirconia crowns

• Main Authors: Keisuke Nakamura (Author), Mathieu Mouhat (Author), John Magnus Nergård (Author), Solveig Jenssen Lægreid (Author), Taro Kanno (Author), Percy Milleding (Author), Ulf Örtengren (Author)
• Format: Book
• Published: Taylor & Francis Group, 2016-12-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 2333-7931; 10.3109/23337931.2015.1129908
• Keywords: Monolithic zirconia crowns; fracture resistance; zinc phosphate cement; glass-ionomer cement; resin-based cement; Dentistry; RK1-715
• Source: Acta Biomaterialia Odontologica Scandinavica, Vol 2, Iss 1, Pp 12-19 (2016)

Objectives The present study investigated the effect of cements on fracture resistance of monolithic zirconia crowns in relation to their compressive strength. Materials and methods Four different cements were tested: zinc phosphate cement (ZPC), glass-ionomer cement (GIC), self-adhesive resin-based cement (SRC) and resin-based cement (RC). RC was used in both dual cure mode (RC-D) and chemical cure mode (RC-C). First, the compressive strength of each cement was tested according to a standard (ISO 9917-1:2004). Second, load-to-failure test was performed to analyze the crown fracture resistance. CAD/CAM-produced monolithic zirconia crowns with a minimal thickness of 0.5 mm were prepared and cemented to dies with each cement. The crown-die samples were loaded until fracture. Results The compressive strength of SRC, RC-D and RC-C was significantly higher than those of ZPC and GIC (p < 0.05). However, there was no significant difference in the fracture load of the crown between the groups. Conclusion The values achieved in the load-to-failure test suggest that monolithic zirconia crowns with a minimal thickness of 0.5 mm may have good resistance against fracture regardless of types of cements.