실리카 마이크로겔을 첨가한 3D프린팅 의치상 레진과 경성 이장재 간의 전단 접착강도 비교 연구
Comparison of shear bond strength between hard relining material and 3D-printing denture base resin containing silica micro-gel
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목적: 현재 3D 프린팅을 통한 총의치의 제작은 적층 제조의 특성상 물리적 특성의 한계점들이 존재한다. 이를 극복하기 위한 여러 방법들 중 레진에 미세입자를 첨가해 강도를 높이는 방법이 유효하다고 밝혀졌다. 이에 본 연구에서는 3D 프린팅 레진 의치상의 표면에 존재하는 미세입자를 제거했을 때 의치상 레진과 이장 재료 간의 전단 접착강도를 비교 분석하기 위해 실험을 진행하였다. 연구 재료 및 방법: 63 μm 크기의 실리카 마이크로겔을 3D 프린팅 의치상용 레진에 2 wt%, 3 wt% 중량비로 혼합하고, 대조군을 포함한 세 중량비의 레진을 원기둥 형태로 출력하였다. 표면의 실리카 입자를 용해시키기 위해 에칭 용액을 적용하고, Tokuyama Rebase II normal, KOOLINER, ProBase Cold의 세 재료를 원통형 모양으로 부착한 다음 전단 접착강도를 측정하고 중량비에 따른 유의차를 평가하였다. 또한 파절 양상을 입체현미경으로 관찰하였다. 결과: 전단 접착강도는 세 레진 모두 실리카가 혼합되지 않은 대조군에서 가장 큰 평균값을 보였으며, 중량비 간에는 접착 강도의 유의한 차이가 존재하였다. 간접법 첨상용 레진인 ProBase Cold에서 가장 큰 값의 강도가 측정되었고, 모든 군에서 파절 양상은 접착성 파절이 주로 일어났다. 결론: 실리카 마이크로겔을 첨가한 3D 프린팅 의치상 레진에서 표면의 실리카를 용해하고 이장용 레진을 접착했을 때, 전단 접착강도가 유의하게 감소하였다.
Abstract
Purpose: Various methods have been attempted to overcome limitations of physical characteristics of 3D-printed dentures; among them a novel method of increasing fracture strength by adding fine particles into the resin has been found to be effective. However, there are still limited research on the effect of these particles on the bond strength between the printed resin and denture relining materials. The purpose of this study is to compare the shear bond strength between the 3D-printing denture base resin and various relining materials when micro-particles on the surface of the resin are removed. Materials and Methods: 63 μm-sized silica microgels were mixed into 3D-printing denture base resin to make groups of weight ratio of 2 wt% and 3 wt%. After printing all 3 groups, including the control group, an HF etching solution was applied to dissolve the silica micro-particles on the surface. Three kinds of relining materials, Tokuyama Rebase II normal, KOOLINER, and ProBase Cold were attached to the surface. The shear bond strength values and the failure modes for each group were analyzed. Results: The shear bond strength showed the largest average value in the control group, in which silica was not mixed, among all three relining materials. Also, there were significant differences between specimens with different weight ratios. The largest value was measured in ProBase Cold, and the main failure mode was adhesive failure in all groups. Conclusion: The shear bond strength was significantly reduced when the silica micro-particles on the surface were removed from the 3D printing denture base resin.
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