Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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Shear Bonding Strength of Three Cements Luted on Pediatric Zirconia Crowns and Dentin of Primary Teeth

3종 시멘트로 접착한 소아용 기성 지르코니아 전장관과 유치 상아질의 전단결합강도

  • Lee, Jeongeun (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Howon (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Lee, Juhyun (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Seo, Hyunwoo (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University)
  • 이정은 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 박호원 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 이주현 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 서현우 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소)
  • Received : 2017.09.07
  • Accepted : 2017.11.24
  • Published : 2018.08.31
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Abstract

The aim of this study was to evaluate the shear bond strength of three luting cements and to identify the effect of thermocycling. Zirconia discs were made similar to the inner surface of a preformed pediatric zirconia crown ($NuSmile^{(R)}$ ZR crown: ZRCr). The similarity between the zirconia discs and the inner surface of a ZRCr was confirmed by scanning electron microscope. Three luting cements were $Ketac^{TM}$ Cem Permanent Glass Ionomer Luting Cement (KGI), $RelyX^{TM}$ Luting Plus Cement (RLP), $RelyX^{TM}$ Unicem Self-Adhesive Universal Resin Cement (RUR). Three luting cements were bonded according to the manufacturer's instructions for 60 zirconia discs and 60 dentin of primary teeth. Total of 120 specimens were divided into two subgroups: One was not aged, and the other was tested with 5500 thermocycling. Shear bond strength was measured using a universal testing machine, and the fracture patterns were observed with SEM. On the zirconia discs and the dentin of primary teeth, shear bond strength of RUR was higher than that of KGI and RLP, and there were statistically significant differences by cement type. The shear bond strength differences for RUR were not statistically significant depending on thermocycling.

이 연구의 목적은 3종 시멘트의 전단결합강도를 평가하고 열순환 시행이 전단결합강도에 미치는 영향을 알아보고자 한다. 소아치과에서 사용되는 소아용 기성 지르코니아 전장관($NuSmile^{(R)}$ ZR crown)의 내면과 유사한 디스크 형태의 지르코니아 시편(Zirconia discs)을 제작하였다. 소아용 기성 지르코니아 전장관의 내면과 지르코니아 시편의 표면이 동일하도록 같은 몰드를 이용하여 제작하였으며 주사전자현미경을 통해 유사함을 확인하였다. 60개의 지르코니아 시편과 60개의 유구치 상아질 시편을 3종의 시멘트 $Ketac^{TM}$ Cem Permanent Glass Ionomer Luting Cement(KGI), $RelyX^{TM}$ Luting Plus Cement(RLP), $RelyX^{TM}$ Unicem Self-Adhesive Universal Resin Cement(RUR)에 따라 20개씩 나누고, 열순환 시행 유무에 따라 다시 10개씩 2개의 하위그룹으로 나누었다. 하위그룹 A는 열순환을 시행하지 않았고 하위그룹 B는 5500회의 열순환을 시행하였다. 만능 재료 시험기를 이용하여 전단결합강도를 측정한 후 파절 양상을 주사전사현미경으로 관찰하였다. 지르코니아 시편 및 유구치 상아질 시편에 접착한 시멘트의 전단결합강도는 RUR이 KGI와 RLP보다 높았으며 통계적으로 유의한 차이가 관찰되었다(p < 0.05). RUR의 전단결합강도는 열순환 시행하지 않은 군과 열순환 시행한 군 사이에 통계적으로 유의한 차이가 없었다.

Keywords

References

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