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KMID : 0362320060310060415
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Journal of Korean Academy of Operative Dentistry
2006 Volume.31 No. 6 p.415 ~ p.426
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AGING EFFECT ON THE MICROTENSILE BOND STRENGTH OF SELF-ETCHING ADHESIVES
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Park Jin-Sung
Kim Jong-Soon
Kim Min-Soo
Son Ho-Hyun
Gwon Hyeok-Chun
Cho Byeong-Hoon
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Abstract
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In this study, the changes in the degree of conversion (DC) and the microtensile bond strength (MTBS) of self-etching adhesives to dentin was investigated according to the time after curing. The MTBS of Single Bond (SB, 3M ESPE, USA), Clearfil SE Bond (SE, Kuraray, Japan), Xeno-III (XIII, Dentsply, Germany), and Adper Prompt (AP, 3M ESPE, USA) were measured at 48h, at 1 week and after thermocycling for 5,000 cycles between 5℃ and 55℃. The DC of the adhesives were measured immediately, at 48h and at 7 days after curing using a Fourier Transform Infra-red Spectrometer. The fractured surfaces were also evaluated with scanning electron microscope. The MTBS and DC were significantly increased with time and there was an interaction between the variables of time and material (MTBS, 2-way ANOVA, p = 0.018; DC, Repeated Measures ANOVA, p < 0.001). The low DC was suggested as a cause of the low MTBS of self-etching adhesives, XIII and AP, but the increase in the MTBS of SE and AP after 48h could not be related with the changes in the DC. The microscopic maturation of the adhesive layer might be considered as the cause of increasing bond strength.
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KEYWORD
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Self-etching adhesive, Microtensile bond strength, Degree of conversion, Brittle fracture, Aging
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