Restorative Dentistry and Endodontics

  • 제34권1호
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  • Pages.51-60
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  • 2009
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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열순환 후 상아질 접착 계면의 수분 투과성 변화에 대한 정량적 분석

QUANTITATIVE COMPARISON OF PERMEABILITY IN THE ADHESIVE INTERFACE OF FOUR ADHESIVE SYSTEMS

  • 장주혜 (서울대학교 치의학대학원 치과보존학교실) ;
  • 이기욱 (한국기초연구과학지원연구원) ;
  • 김혜영 (서울대학교 치의학생명과학사업단 (BK 21)) ;
  • 이인복 (서울대학교 치의학대학원 치과보존학교실) ;
  • 조병훈 (서울대학교 치의학대학원 치과보존학교실) ;
  • 손호현 (서울대학교 치의학대학원 치과보존학교실)
  • Chang, Ju-Hea (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Yi, Kee-Wook (Geochronology Team, Korea Basic Science Institute) ;
  • Kim, Hae-Young (Craniomaxillofacial Life Science(BK 21), School of Dentistry, Seoul National University) ;
  • Lee, In-Bog (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Cho, Byeong-Hoon (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Son, Ho-Hyun (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
  • 발행 : 2009.01.30
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초록

본 연구는 현재 시판 되고 있는 여러 개의 상아질 접착제를 임상 술식에서와 같은 방법으로 사용한 다음 열순환 후 접착계면의 변화를 관찰 비교하고자 했다. 발거 한지 한 달 이내인 대구치 28개의 교합면 상아질 표면에 4종의 상아질 접착제 (OptiBond FL [OP], AdheSE [AD], Clearfil SE Bond [CL], Xeno III [XE]) 중 하나를 적용한 뒤 복합 레진 (Premisa, Kerr) 을 1 mm 두께로 올린 후 광중합 하였다. $4^{\circ}C$ 증류수에서 6일간 보관한 뒤, 치아의 정중선으로부터 수직으로 절단 하여 그 중 절반의 치아에서 2 mm 두께의 시편을 얻은 다음 남은 반쪽의 치아는 10,000회의 열순환을 가한 뒤 ($5^{\circ}-55^{\circ}$, 침지 시간 25초, 대기 시간 5초) 같은 방법으로 2 mm 두께의 시편을 얻었다. 연마한 시편을 24시간 동안 50% ammoniacal silver nitrate solution에 담근 다음 photo-developing solution에서 8시간 동안 환원시켰다. 계면을 가로지르는 5개의 line상에서 wavelength dispersive spectrometry (WDS) detector를 이용하여 주사전상에 있는 원소들의 중량비를 계산하였다. 또한 열순환 전과 후의 시편에서 얻어진 5개의 silver 측정치를 서로 비교하였다. 열순환 전의 접착제층(adhesive layer)에서는 OP에서 가장 적은 silver의 투과가 관찰되었으며 (p < 0.0001), CL, AD, XE 순으로 투과 량이 증가함을 보였다. 혼성층 (Hybrid layer) 에서는 CL의 투과량이 가장 적었다 (p = 0.0039). 열순환 후에 접착제층과 혼성층에서 silver의 투과량은 증가하지는 않았다. Scanning electron microscopy (SEM) 사진을 통하여 각 시편의 접착 계면에서 접착제에 따른 특이적인 silver의 투과상을 관찰할 수 있었다. 전반적으로 OP 와 CL의 접착계면이 열순환 과정 중에도 온전히 유지됨을 볼 수 있었다. 접착 계면에서의 수분 투과 양상은 각 접착제에 따라 다른 형태를 보였으며 열 순환에 의해 유의할 만한 변화를 야기하지는 않았다.

The purpose of this study was to perform quantitative comparisons of water permeable zones in both the adhesive and the hybrid layer before and after thermo cycling in order to assess the integrity of the bonding interface. Twenty eight flat dentin surfaces were bonded with a light-cured composite resin using one of four commercial adhesives [OptiBond FL (OP), AdheSE (AD), Clearfil SE Bond (CL). and Xeno III (XE)]. These were sectioned into halves and subsequently cut to yield 2-mm thick specimens; one specimen for control and the other subjected to thermocycling for 10,000 cycles. After specimens were immersed in ammoniacal silver nitrate for 24 h and exposed to a photo developing solution for 8 h, the bonded interface was analyzed by scanning electron microscopy (SEM) and wavelength dispersive spectrometry (WDS) at five locations per specimen. Immediately after bonding. the adhesive layer of OP showed the lowest silver uptake, followed by CL, AD. and XE in ascending order (p < 0.0001); the hybrid layer of CL had the lowest silver content among the groups (p = 0.0039). After thermocycling, none of the adhesives manifested a significant increase of silver in either the adhesive or the hybrid layer. SEM demonstrated the characteristic silver penetrated patterns within the interface. It was observed that integrity of bonding was well maintained in OP and CL throughout the thermocycling process. Adhesive-tooth interfaces are vulnerable to hydrolytic degradation and its permeability varies in different adhesive systems, which may be clinically related to the restoration longevity.

키워드

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