Bond strength of veneer ceramic and zirconia cores with different surface modifications after microwave sintering
The Journal of Advanced Prosthodontics
;
: 485-493, 2013.
Article
in English
| WPRIM
| ID: wpr-227894
ABSTRACT
PURPOSE:
To evaluate the effects of surface treatments on shear bond strength (SBS) between microwave and conventionally sintered zirconia core/veneers. MATERIALS ANDMETHODS:
96 disc shaped Noritake Alliance zirconia specimens were fabricated using YenaDent CAM unit and were divided in 2 groups with respect to microwave or conventional methods (n=48/group). Surface roughness (Ra) evaluation was made with a profilometer on randomly selected microwave (n=10) and conventionally sintered (n=10) cores. Specimens were then assessed into 4 subgroups according to surface treatments applied (n=12/group). Groups for microwave (M) and conventionally (C) sintered core specimens were as follows; M(C),C(C) untreated (control group), M1,C1Al2O3 sandblasting, M2,C2liner, M3,C3Al2O3 sandblasting followed by liner. Veneer ceramic was fired on zirconia cores and specimens were thermocycled (6000 cycles between 5degrees-55degrees C). All specimens were subjected to SBS test using a universal testing machine at 0.5 mm/min, failure were evaluated under an optical microscope. Data were statistically analyzed using Shapiro Wilk, Levene, Post-hoc Tukey HSD and Student's t tests, Two-Way-Variance-Analysis and One-Way-Variance-Analysis (alpha=.05).RESULTS:
Conventionally sintered specimens (1.06 +/- 0.32 microm) showed rougher surfaces compared to microwave sintered ones (0.76 +/- 0.32 microm)(P=.046), however, no correlation was found between SBS and surface roughness (r=-0.109, P=.658). The statistical comparison of the shear bond strengths of C3 and C1 group (P=.015); C(C) and M(C) group (P=.004) and C3 and M3 group presented statistically higher (P=.005) values. While adhesive failure was not seen in any of the groups, cohesive and combined patterns were seen in all groups.CONCLUSION:
Based on the results of this in-vitro study, Al2O3-sandblasting followed by liner application on conventionally sintered zirconia cores may be preferred to enhance bond strength.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Zirconium
/
Ceramics
/
Adhesives
/
Collodion
/
Fires
/
Methods
/
Microwaves
Language:
English
Journal:
The Journal of Advanced Prosthodontics
Year:
2013
Type:
Article
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