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KMID : 0362720050430110720
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Journal of the Korean Dental Association
2005 Volume.43 No. 11 p.720 ~ p.727
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Shear bond strength of 7th generation dentin bonding agent
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Goo Jae-Hong
Cha Hyun-Suk
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Abstract
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Purpose :The objective of this study was to evaluate shear bond strength of seventh generation dentin adhesive system (i-bond).
Materials and Methods : Specimens were obtained from 48 extracted human molars. Twelve dentin specimens were randomly assigned to each of 4 different adhesive systems (Prime & bond NT; One up bond; Prompt L-pop; I-bond). The occulusal surfaces of molars were grounded flat to expose dentin surface and 4 different bonding systems were applied according to the manufacturer’s instructions. The plastic molds were placed on the bonded surface, and composite resin (Z250) were added on that surface and light irradiated for 40 sec. The resin-bonded teeth were stored in water (37℃) for 24 hours, and these specimens were tested in a shear mode at a cross-head speed of 1.0mm/min using an Instron testing machine. The data for each groups were subjected to an Tukey multiple comparisons test (p=0.05).
Results : i-bond exhibited significantly lower bond strength (7.41 ± 1.39 MPa) than Prime & bond NT (19.69 ± 5.05 MPa) and One up bond(10.84 ± 2.91 MPa)(p<0.05). Prompt L-pop (10.38 ± 2.02 MPa) and i-bond were not significantly different(p>0.05).
Fracture surface of i-bond indicated adhesive fracture. One up bond and Prompt L-pop indicated adhesive/cohesive complex fracture, and Prime & bond NT indicated cohesive fracture.
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KEYWORD
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7th generation dentin bonding agent, shear bond strength, fracture surface:i-bond
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