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KMID : 0362320110360060490
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Journal of Korean Academy of Operative Dentistry
2011 Volume.36 No. 6 p.490 ~ p.497
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Bonding efficacy of cured or uncured dentin adhesives in indirect resin
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Jang Ji-Hyun
Lee Bin-Na
Chang Hoon-Sang
Hwang Yun-Chan
Oh Won-Mann
Hwang In-Nam
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Abstract
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Objectives:This study examined the effect of the uncured dentin adhesives on the bond interface between the resin inlay and dentin.
Materials and Methods:Dentin surface was exposed in 24 extracted human molars and the teeth were assigned to indirect and direct resin restoration group. For indirect resin groups, exposed dentin surfaces were temporized with provisional resin. The provisional restoration was removed after 1 wk and the teeth were divided further into 4 groups which used dentin adhesives (OptiBond FL, Kerr; One-Step, Bisco) with or without light-curing, respectively (Group OB-C, OB-NC, OS-C and OS-NC). Pre-fabricated resin blocks were cemented on the entire surfaces with resin cement. For the direct resin restoration groups, the dentin surfaces were treated with dentin adhesives (Group OB-D and OS-D), followed by restoring composite resin. After 24 hr, the teeth were assigned to microtensile bond strength (μTBS) and confocal laser scanning microscopy (CLSM), respectively.
Results:The indirect resin restoration groups showed a lower μTBS than the direct resin restoration groups. The μTBS values of the light cured dentin adhesive groups were higher than those of the uncured dentin adhesive groups (p < 0.05). CLSM analysis of the light cured dentin adhesive groups revealed definite and homogenous hybrid layers. However, the uncured dentin adhesive groups showed uncertain or even no hybrid layer.
Conclusions:Light-curing of the dentin adhesive prior to the application of the cementing material in luting a resin inlay to dentin resulted in definite, homogenous hybrid layer formation, which may improve the bond strength.
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KEYWORD
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Bond interface, Confocal microscopy, Dentin adhesive, Microtensile bond strength, Resin inlay
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