The effect of air-abrasion and heat treatment on the XXXX behavior of Y-TZP.

@entity16773 @entity174 @entity3758
OBJECTIVES: This study evaluated how the flexural strength and @entity174 behavior of a zirconia-based ceramic (Y-TZP) were affected by pre- and post-sintering mechanical and thermal treatments. METHODS: Treatments included sandblasting with different particle size and type (30 m @entity3758 ; 50 and 110 m @entity16773 ) and thermal conditioning. Two hundred bar-shaped specimens of pre-sintered Y-TZP ceramic (Lava Frame, 3M) were prepared (specimen dimensions: 25mm length*4mm width*0.7mm thickness) and divided into three groups (before sintering, after sintering and after sintering with heating treatment). The before sintering group specimens were airborne-particle abraded prior to dense sintering. Specimens from the after sintering group were airborne-particle abraded after sintering. The after sintering with heating treatment group specimens were submitted to a heating procedure after airborne-particle abrasion. The controls were the specimens that were sintered and not treated with any conditioning procedures. The specimens from all experimental conditions were analyzed by SEM, CLSM and XRD. All specimens were tested in four-point bending. Data were statistically analyzed using one-way ANOVA and Post Hoc tests (a=0.05). A Weibull analysis was used to analyze the strength reliability. RESULTS: Sandblasting pre-sintered zirconia before sintering significantly decreased the flexural strength, except when the smallest blasting particles were used (30 m @entity3758 ). Phase transformation (t-m) was observed after sandblasting and reverse transformation (m-t) was observed after heating. SIGNIFICANCE: Sandblasting with 30 m @entity3758 and 50 m @entity16773 allowed lower phase transformation. However, 30mm @entity3758 presented better reliability.
