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지르코니아 코어와 전장용 세라믹의 결합 강도에 대한 표면 처리방법 평가

Evaluation of surface treatment methods on the bond strength of veneer ceramic to the zirconia core

대한치과기공학회지 2020년 42권 3호 p.213 ~ 219
이광영, 홍민호,
소속 상세정보
이광영 ( Lee Gwang-Young ) - Wonkwang Health Science University Department of Dental Laboratory Technology
홍민호 ( Hong Min-Ho ) - Catholic University of Pusan College of Health Sciences Department of Dental Laboratory Science

Abstract


Purpose: This study aimed to identify the impact of physical surface roughing with a polishing tool onto the pre-sintering yttria-stabilized tetragonal zirconia polycrystals (TZP) core and liner treatment for chemical bonding on the bond strength of TZP core and veneering ceramic.

Methods: Overall, 80 specimens were classified into two groups (non-liner, NL; and usingliner, UL ) depending on the use of liner, and these two groups were then subclassified into four groups depending on the polishing tool used. (1) Non-liner groups: NS, non-liner+stone point; NC, non-liner+carbide bur; NP, non-liner+paper cone point; NT, non-liner+silicon point. (2) Using-liner groups: US, using-liner+stone point; UC, using-liner+carbide bur; UP, usingliner+ paper cone point; UT, using-liner+silicon point. The pre-sintering surface roughing values and shapes were observed, and after burning up the veneering ceramic, the shear bond strength was measured using a universal testing machine. For significance testing, a oneway analysis of variance and Tukey’s multiple comparison test were conducted. An optical microscope was used to observe the fracture plane, and the following results were obtained.

Results: Surface roughness NP (4.09±0.51 μm) represented a higher value than other groups (p<0.001). In shear bond strength, NS (35.21±1.44 MPa) of the NL group showed the highest bond strength (p<0.001). The UL group did not show a statistically significant difference between groups (p=0.612).

Conclusion: Our study findings reveal that the bond strength of TZP core and veneering ceramic was improved by pre-sintering physical surface treatment than by chemical bonding with liner surface treatment.

키워드

Bond strength; Liner; Veneering ceramic; Zirconia

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