Evaluation of Fracture Resistance in Aqueous Environment of Four Restorative Systems for Posterior Applications. Part 1

Abstract

Fracture resistance of monolithic lithium disilicate in an aqueous environment is promising and requires second phase testing to evaluate the potential of various thicknesses appropriate for posterior single tooth applications. Doubling the IPS e.max Zirpress zirconia core from 0.4 mm to 0.8 mm increased the fracture resistance of this restorative system threefold.

Fracture load of ceramic restorations after fatigue loading

“…Their study did not fatigue specimens and used LAVA Plus (3M ESPE) zirconia and e.max Press (Ivoclar Vivadent) lithium disilicate bonded with a resin cement. Dhima et al 14 recorded lower values (743 N for 2-mm-thick lithium disilicate and 1106 N for 2-mm-thick bilayered zirconia). Their study was performed with e.max ZirPress (Ivoclar Vivadent) zirconia, and fracture testing was performed under water.…”

In vitro analysis of the fracture resistance of CAD–CAM monolithic zirconia molar crowns with different occlusal thickness

“…Previous in vitro investigations showed that monolithic zirconia SCs exhibited fracture loads higher than those of layered zirconia restorations (Dhima et al 2013;Sun et al 2014;Lan et al 2015). Recently, an in vitro analysis reported that monolithic zirconia crowns with an occlusal thickness of 0.5 mm showed sufficient fracture resistance to withstand occlusal loads in the molar regions (Nakamura et al 2015).…”

Survival rate of lithium disilicate restorations at 4 years: A retrospective study

“…2 However, clinical longevity cannot be accurately predicted based on these properties or from in vitro load-to-failure tests. [3][4][5][6] Most of these systems have been brought to market with almost no independent clinical testing. Ninety-five percent of metal ceramic restorations are intact and functioning at 11 years.…”