Abstract
Objectives: Surface quality strongly influences the mechanical strength of dental restorative materials by a specific surface flaw population. Perfect polishing is thus a highly recommended clinical procedure to ensure maximum mechanical performance. Dental restorations are commonly exposed to masticatory loads much lower than their short time fracture strength. Surface microcracks can grow under subcritical fatigue loads resulting in premature failure of a restoration. This study was conducted to discuss the relevant parameters on ceramic strength and degradation over time. The aim was to correlate surface roughness, fracture strength, toughness and degradation behavior by slow crack growth with the results of a prospective clinical trial. The fracture strength
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