Structural Alterations of Zirconia Depending on Sintering Parameters and Effects on Bond Strength After Different Surface Treatments

Yıl 2019, Cilt: 22 Sayı: 4, 402 - 411, 29.12.2019

Mehmet Emre Coskun Mehmet Fehim Çelenk

https://doi.org/10.7126/cumudj.583267

Öz

Objectives:
Zirconia having different physical and optical properties is obtained
after the application of different sintering parameters. This study aims to investigate structural variations
after administering different sintering protocols and to evaluate the effect of
different surface treatments on shear bond strength.

Materials and Methods: Eighty translucent zirconia specimens (7x3 mm)
were divided into two different sintering groups (1480 0C for 180
min; 1510 0C for 30 min), then divided into four subgroups according
to surface treatments: control, sandblasted, Er-YAG, and Nd-YAG (n:10). One specimen from each group was analyzed with XRD and
one from each subgroup was analyzed with SEM. Ceramics (5x3 mm) were fired onto
the zirconia for shear bond strength test using universal testing machine and
the failure mode was determined by using stereomicroscope. Translucency
and contrast ratio were measured by using spectrophotometer, and biaxial
flexural strength test performed by employing universal testing machine on
specimens with a diameter (15x1,3 mm) from each sintering group (n:10). Data was analyzed by using
two-way ANOVA and Bonferroni Post hoc tests (P<.05).

Results: The short
sintering group showed higher biaxial flexural strength (943.87±48.69 MPa). The
highest surface roughness values were obtained in short sintering groups and
within the groups Nd-YAG application was found the most effective method
(4.11±0.28 Ra). The highest bond strength value was obtained in sandblasted
short time sintered group (29.71±2.52 MPa). The translucency and contrast ratio
showed no significant difference.

Conclusion: Although a physically stronger zirconia is
obtained by short sintering process, long-term sintered zirconia forms a more
durable bond strength with ceramics. Sandblasting improve the ceramic-zirconia
bond strength may have more benefits than the use of Er-YAG, and Nd-YAG lasers.

Anahtar Kelimeler

zirconia, sintering, shear bond strength, surface treatment

Proje Numarası

DIS-172

Kaynakça

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