Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
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Effect of mechanical surface treatment on the fracture resistance and interfacial bonding failure of Y-TZP zirconia

Y-TZP zirconia의 기계적 표면처리가 파절저항과 접착계면 실패에 미치는 영향

  • Yi, Yang-Jin (Department of Prosthodontics, Section of Dentistry, Seoul National University Bundang Hospital)
  • 이양진 (분당서울대병원 치과보철과)
  • Received : 2014.04.29
  • Accepted : 2014.05.17
  • Published : 2014.06.30
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Abstract

Purpose: Surface damage and bonding strength difference after micromechanical treatment of zirconia surface are to be studied yet. The aim of this study was to evaluate the difference of fracture resistance and bonding strength between more surface-damaged group from higher air-blasting particle size and pressure, and less damaged group. Materials and Methods: Disk shape zirconia ($LAVA^{TM}$) was sintered and air-blasted with $30{\mu}m$ particle size (Cojet), under 2.8 bar for 15 seconds, $110{\mu}m$ particle size (Rocatec), under 2.8 bar for 15 seconds, and $110{\mu}m$ particle size (Rocatec), under 3.8 bar for 30 seconds respectively. Biaxial flexure test and bonding failure load test were performed serially (n = 10 per group). For bonding test, specimens were bonded on the base material having similar modulus of elasticity of dentin with $200{\mu}m$-thick resin cement for tension of surface damage. Failure load of bonding was detected with acoustic emission (AE) sensor. Results: There were no significant differences both in the biaxial flexure test and bonding failure load test between groups (P > 0.05). Sub-surface cracks were all radial cracks except for two specimens. Conclusion: Within the limitations of no aging under monotonic load test, surface damage from higher air-blasting particle size and pressure was not significant. Evaluations of failure load with bonded zirconia disks was clinically relevant modality for surface damage and bonding strength, simultaneously.

목적: 본 연구의 목적은 air-blasting particle size를 달리하고 분사 압력과 시간을 통상보다 크게 증가시켜 표면에 큰 손상을 유발한 군을 상대적으로 작은 손상을 유발한 군과 비교하여 파절 저항과 접착 강도 차이를 보이는지 평가하는 데 있다. 연구 재료 및 방법: 지르코니아($LAVA^{TM}$) 디스크 표면에 각각 $30{\mu}m$- particle size (Cojet) 2.8 bar 15초, $110{\mu}m$- (Rocatec) 2.8 bar 15초, $110{\mu}m$- (Rocatec) 3.8 bar 30초로 조건을 달리하여 표면처리 후 각각 이축 굽힘하중 강도 실험과 접착 파절 하중 실험을 실행하였다. 접착은 상아질 유사 베이스에 $200{\mu}m$ 두께의 레진시멘트로 시행하여 인장력을 극대화하였으며 음향방출(AE) 센서로 실패하중을 검출하였다. 결과: 이축 굽힘하중 강도, 접착 파절하중은 세 군간 서로 유의성 있는 차이를 보이지 않았다(P > 0.05). 접착 시편의 균열은 대부분 radial crack이었다. 결론: 정하중 평가의 한계 내에서, air-blasting particle size와 압력에 의한 표면 손상은 크지 않았으며, 접착 파절하중 평가는 표면 손상과 접착 강도를 동시에 평가할 수 있는 방법이라 여겨진다.

Keywords

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