3종 시멘트로 접착한 소아용 기성 지르코니아 전장관과 유치 상아질의 전단결합강도
Shear Bonding Strength of Three Cements Luted on Pediatric Zirconia Crowns and Dentin of Primary Teeth
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초록
이 연구의 목적은 3종 시멘트의 전단결합강도를 평가하고 열순환 시행이 전단결합강도에 미치는 영향을 알아보고자 한다. 소아치과에서 사용되는 소아용 기성 지르코니아 전장관(NuSmile® 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 KetacTM Cem Permanent Glass Ionomer Luting Cement(KGI), RelyXTM Luting Plus Cement(RLP), RelyXTM Unicem Self-Adhesive Universal Resin Cement(RUR)에 따라 20개씩 나누고, 열순환 시행 유무에 따라 다시 10개씩 2개의 하위그룹으로 나누었다. 하위그룹A는 열순환을 시행하지 않았고 하위그룹 B는 5500회의 열순환을 시행하였다. 만능 재료 시험기를 이용하여 전단결합강도를 측정한후 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 차이가없었다.
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® 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 KetacTM Cem Permanent Glass Ionomer Luting Cement (KGI), RelyXTM Luting Plus Cement (RLP), RelyXTM 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.
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