J Korean Acad Conserv Dent.  2011 Nov;36(6):490-497. 10.5395/JKACD.2011.36.6.490.

Bonding efficacy of cured or uncured dentin adhesives in indirect resin

• Jang JH
• Lee BN
• Chang HS
• Hwang YC
• Oh WM
• Hwang IN

• KMID: 2176603
• DOI: http://doi.org/10.5395/JKACD.2011.36.6.490

Abstract

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 (microTBS) and confocal laser scanning microscopy (CLSM), respectively.
RESULTS
The indirect resin restoration groups showed a lower microTBS than the direct resin restoration groups. The microTBS 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.

Keyword

Bond interface; Confocal microscopy; Dentin adhesive; Microtensile bond strength; Resin inlay

MeSH Terms

Adhesives
Chimera
Dentin
Humans
Inlays
Light
Microscopy, Confocal
Molar
Resin Cements
Tooth
Adhesives
Resin Cements

Figure

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  Figure 1 Experimental groups and sequence.

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  Figure 2 CLSM images of the direct resin restoration groups. (a) Group OB-D, dentin adhesive, OptiBond FL. Obvious hybrid layer is observed. (b) Group OS-D, dentin adhesive, OneStep. Filler particles of composite resin (EsteliteΣ) were seen in both groups (asterisk).

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  Figure 3 CLSM images of the indirect resin restoration groups. (a) Group OB-C, cured dentin adhesive, OptiBond FL. Evident and homogenous hybrid layer (white arrow) is seen in resin-dentin interdiffusion zone (RDIZ). (b) Group OB-NC, uncured dentin adhesive, OptiBond FL. (c) Group OS-C, cured dentin adhesive, OneStep. Lateral branching of adhesive tubule tags (white arrowhead) are presented. (d) Group OS-NC, uncured dentin adhesive, OneStep. Note the discontinuous and ruptured hybrid layer (white arrow) in RDIZ.

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