A Study on Shear Bond Strength of Core-veneer Interface for Bilayered all Ceramics

Bilayered all Ceramics에서 Core와 Veneer 계면의 전단결합강도에 관한 연구

  • Jung, Yong-Su (Department of Prosthodontics, College of dentistry, Wonkwang University) ;
  • Lee, Jin-Han (Department of Prosthodontics, College of dentistry, Wonkwang University) ;
  • Lee, Jae-In (Department of Prosthodontics, College of dentistry, Wonkwang University) ;
  • Dong, Jin-Keun (Department of Prosthodontics, College of dentistry, Wonkwang University)
  • 정용수 (원광대학교 치과대학 보철학교실) ;
  • 이진한 (원광대학교 치과대학 보철학교실) ;
  • 이재인 (원광대학교 치과대학 보철학교실) ;
  • 동진근 (원광대학교 치과대학 보철학교실)
  • Received : 2008.07.11
  • Accepted : 2008.09.25
  • Published : 2008.09.30

Abstract

Purpose: The purpose of this study was to investigate the bond strength of the core-veneer interface in all ceramic systems. Material and Methods: The all ceramic systems tested with their respective veneer were IPS Empress 2 with IPS Eris, IPS e.max Press with IPS e.max Ceram and IPS-e.max ZirCAD with IPS e.max Ceram. Cores (N=36, N=12/group, diameter: 10mm, thickness: 3mm) were fabricated according to the manufacturer's instruction and cleaned with ultrasonic cleaner. The veneer(diameter: 3mm, thickness: 2mm) were condensed in stainless steel mold and fired on to the core materials. After firing, they were again ultrasonically cleaned and embedded in acrylic resin. The specimens were stored in distilled water at $37^{\circ}C$ for 1 week. The specimens were placed in a mounting jig and subjected to shear force in a universal testing machine(Z020, Zwick, Germany). Load was applied at close to the core-veneer interface as possible with crosshead speed of 1.00mm/min until failure. Average shear bond strengths(MPa) were analyzed with a one-way analysis of variance and the Tukey test(${\alpha}=.05$). The failed specimens were examinated by scanning electron microscopy(JSM-6360, JEOL, Japan). The pattern of failure was classified as cohesive in core, cohesive in veneer, mixed or adhesive. Results: The mean shear bond strength($MPa{\pm}SD$) were IPS e.max Press $32.85{\pm}6.75MPa$, IPS Empress 2 $29.30{\pm}6.51MPa$, IPS e.max ZirCAD $28.10{\pm}4.28MPa$. IPS Empress 2, IPS e.max Press, IPS e.max ZirCAD were not significantly different from each others. Scanning electron microscopy examination revealed that adhesive failure did not occur in any all ceramic systems. IPS Empress 2 and IPS e.max Press exhibited cohesive failure in both the core and the veneer. IPS e.max ZirCAD exhibited cohesive failure in veneer and mixed failure.

Keywords

Bilayerd all ceramics;core-veneer interface;shear bond strength

Acknowledgement

Supported by : 원광대학교

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