Structural Alterations of Zirconia Depending on Sintering Parameters and Effects on Bond Strength After Different Surface Treatments
Abstract
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.
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References
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Details
Primary Language
English
Subjects
Health Care Administration
Journal Section
Research Article
Authors
Mehmet Fehim Çelenk
0000-0002-7484-2855
Türkiye
Publication Date
December 29, 2019
Submission Date
June 27, 2019
Acceptance Date
September 30, 2019
Published in Issue
Year 1970 Volume: 22 Number: 4