지르코니아의 다양한 표면처리 방법과 레진시멘트 종류에 따른 전단결합강도 비교
Comparison of shear bond strength according to various surface treatment methods of zirconia and resin cement types
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목적: 본 연구는 지르코니아의 거칠기 증가를 위한 4가지 표면처리 방법과 3종의 레진시멘트가 전단결합강도에 미치는 영향을 알아보고자 하였다. 재료 및 방법: 총 120개의 지르코니아 시편을 표면처리 방법에 따라 4개의 군으로 나누었다: 대조군, 아무 처리를 하지 않은 군; APA50군, 50 μm 크기의 Al2O3로 Airborne-particle abrasion (APA) 처리를 시행한 군; APA125군, 125 μm 크기의 Al2O3로 APA 처리를 시행한 군; ZA군, ZrO2 slurry를 적용한 군. 각 군에 3종의 레진시멘트(Panavia F 2.0, Superbond C&B, Variolink N)를 접착하고, 만능시험기를 이용하여 전단결합강도를 측정하였다. 주사전자현미경을 이용해 각 군의 대표 표본의 표면을 관찰하였다. 표면처리 방법과 레진시멘트 종류에 따른 상호작용이 존재하는지 알아보기 위하여 Two-way ANOVA를 실시하였고, 각 군 간의 통계적 차이를 알아보기 위해 One-way ANOVA를 시행하였다. 사후검정으로 Tukey HSD test를 실시하였다(α = .05). 결과: 표면처리에 따른 전단결합강도 비교에서, APA125군, APA50군, ZA군, 대조군 순으로 높은 값을 보였고, APA처리를 시행한 군(APA50군, APA125군) 간에는 통계적으로 유의한 차이가 없었다(P > .05). 또한, ZA군은 대조군보다 유의성 있게 높은 값을 보였다(P < .05). 레진시멘트 종류에 따라서는 Panavia F 2.0, Superbond C&B, Variolink N 순으로 높은 전단결합강도를 보였다(P < .05). APA50군과 APA125군에서는 거칠고 불규칙한 표면이 관찰되었고, ZA군에서는 작고 불규칙한 다공성과 거친 표면이 관찰되었다. 결론: 본 연구의 한계내에서, APA 처리와 ZrO2 slurry를 적용했을 때 지르코니아의 표면 거칠기가 증가됨을 확인할 수 있었고, MDP를 함유한 Panavia F 2.0가 지르코니아와의 가장 높은 전단결합강도를 보였다.
Abstract
Purpose: The aim of this study was to evaluate the effects of four surface treatment methods to improve zirconia roughness and three types of resin cement on the shear bond strength (SBS). Materials and methods: A total of 120 zirconia blocks were randomly divided into four surface treatments: non-treatment (Control), airborne-particle abrasion (APA) with 50 μm Al2O3 (APA50), APA with 125 μm Al2O3 (APA125), and ZrO2 slurry (ZA). Three resin cements (Panavia F 2.0, Superbond C&B, and Variolink N) were applied to the surface-treated zirconia specimens. All specimens were subjected to SBS testing using a universal testing machine. The surface of the representative specimens of each group was observed by scanning electron microscope (SEM). SBS data were analyzed with oneway ANOVA, two-way ANOVA test and post-hoc Tukey HSD Test (α=.05). Results: In the surface treatment method, APA125, APA50, ZA, and Control showed high shear bond strength in order, but there was no significant difference between APA125 and APA50 (P >.05). Also, ZA showed significantly higher shear bond strength than Control (P<.05). In the resin cement type, Panavia F 2.0, Superbond C&B, and Variolink N showed significantly higher shear bond strength in order (P<.05). In SEM images, the zirconia surfaces of the APA50 and APA125 showed quite rough and irregular shapes, and the zirconia surface of the ZA was observed small irregular porosity and rough surfaces. Conclusion: APA and ZrO2 slurry were enhanced the surface roughness of zirconia, and Panavia F 2.0 containing MDP showed the highest shear bond strength with zirconia.
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