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

지르코니아 코어와 전장용 세라믹의 결합 강도에 대한 표면 처리 방법 평가

  • Lee, Gwang-Young (Department of Dental Laboratory Technology, Wonkwang Health Science University) ;
  • Hong, Min-Ho (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan)
  • 이광영 (원광보건대학교 치기공과) ;
  • 홍민호 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Received : 2020.07.24
  • Accepted : 2020.08.27
  • Published : 2020.09.30

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 one-way 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 ㎛) 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.

Keywords

References

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