Title of article :
Effects of extreme cooling methods on mechanical properties and shear bond strength of bilayered porcelain/3Y-TZP specimens
Author/Authors :
Almeida-Jْnior، نويسنده , , Antonio A. and Longhini، نويسنده , , Diogo and Domingues، نويسنده , , Natلlia B. and Santos، نويسنده , , Claudinei and Adabo، نويسنده , , Gelson L.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Abstract :
Objectives
tudy investigated the effect of extreme cooling methods on the flexural strength, reliability and shear bond strength of veneer porcelain for zirconia.
s
M9 porcelain was sintered on zirconia bar specimens and cooled by one of the following methods: inside a switched-off furnace (slow), at room temperature (normal) or immediately by compressed air (fast). Three-point flexural strength tests (FS) were performed on specimens with porcelain under tension (PT, n = 30) and zirconia under tension (ZT, n = 30). Shear bond strength tests (SBS, n = 15) were performed on cylindrical blocks of porcelain, which were applied on zirconia plates. Data were submitted to one-way ANOVA and Tukeyʹs post hoc tests (p < 0.05). Weibull analysis was performed on the PT and ZT configurations.
s
y ANOVA for the PT configuration was significant, and Tukeyʹs test revealed that fast cooling leads to significantly higher values (p < 0.01) than the other cooling methods. One-way ANOVA for the ZT configuration was not significant (p = 0.06). Weibull analysis showed that normal cooling had slightly higher reliability for both the PT and ZT configurations. Statistical tests showed that slow cooling decreased the SBS value (p < 0.01) and showed less adhesive fracture modes than the other cooling methods.
al Significance
ooling seems to affect the veneer resistance and adhesion to the zirconia core; however, the reliability of fast cooling was slightly lower than that of the other methods.
Keywords :
Dental ceramic , Residual stress , Bilayer ceramic , Zirconia , COOLING
Journal title :
Journal of Dentistry
Journal title :
Journal of Dentistry