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KMID : 0362420010390020184
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Journal of Korean Academy of Prosthodontics
2001 Volume.39 No. 2 p.184 ~ p.196
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A STUDY ON THE BOND STRENGTH OF RESIN CEMENTS TO EMPRESS 2 CERAMIC
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Kim Jeong-Suk
Hwang Hee-Seong
Jeon Yun-Kyung
Jeon You-Jin
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Abstract
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The objective of this study was to investigate the influence of resin cements and ceramic etching on shear bond strength of Empress 2 ceramic and observe the change of microstructure of ceramic according to etching time. Sixty-six square ceramic specimens (6x6x1.5mm) were prepared. 6 specimens were etched with different etching times (0, 10, 20, 30, 40 and 60 seconds) and observed by means of a scanning electron microscope (SEM). Other sixty specimens were divided into 6 groups with 10 specimens in each group. 3 groups were etched with 4% hydrofluoric acid and each groups was bonded with 3 resin cements (Variolink II, Super-Bond C&B, Panavia F). Each specimen was subjected to a shear load in an Instron at a cross-head speed of 0.5mm/min and was observed with SEM after mechanical testing to establish modes of failure. The results were as follows : 1. Within etched groups, Variolink II and Super-Bond C&B exhibited significantly greater bonding strengths than Panavia F (p<0.05). 2. Bond strength of etching groups had three to five times greater than that of no-etching groups. 3. All of no-etching groups showed adhesive failure and etching groups mostly showed mixed failure. And, 20-second etching specimen showed the most distinct lithium disilicate crystal, so it is considered that 20-second etching is optimal time for bonding.
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KEYWORD
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IPS-Empress 2, Shear bond strength
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