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KMID : 0376319940060010239
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Dental Journal of CNU
1994 Volume.6 No. 1 p.239 ~ p.258
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A Study on the Resin/Dentin Adhesive Interface with Different Dentin Bonding Agents
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Abstract
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The purposes of this study were to evaluate dentin surfaces treated with different conditioning methods and to compare resin/dentin adhesive interfaces of six dentin bonding agents. Freshly extracted human third molars were cut to prepare
suprapulpal
dentin disks with a thickness of 1.5 mm. Dentin disks were treated with dentin conditioners. The modified dentin surfaces were examined morphologically by SEM. The dentin adhesives applied to the pretreated dentins, and embedded in an epoxide
resin. The
undecalcified specimens were sectioned to expose interfaces. The specimen surfaces were cleaned by argon ion beam sputtering and the interfaces were examined by SEM.
@ES The results were as follows:
@EN 1. The smear layers were removed completely in the Scotchbond Multi-Purpose, All Bond 2, and Super-Bond C & B. A porous structure was observed in the Scotchbond Multi-Purpose Coarse particles were precipitated in the Clearfil Photobond.
Debris
and
remnants were seen in the Scotchbond 2. The treated surface of Gluma had irregular outlines of dentinal tubules.
2. The depth of decalcification was diverse. The Clearfil Photobond showed a greater decalcification depth than the other groups. The hybrid layer was formed below the undecalcified reference line.
3. A resin-impregnated demineralized dentin with various thicknesses were formed at the bonding interfaces. The hybrid layer was not identified in the Gluma. The Clearfil Photobond showed greater impregnation of 4.2㎛. The average thickness of
the
hybrid layer was 3.9㎛in the Scotchbond Multi-Purpose, 3.4㎛in the All bond 2, 2.6㎛in the Super-Bond C & B, and 1.6㎛in the Scotchbond 2.
4. Although the separations in the Scotchbond 2 and Gluma groups were detected sometimes at the interfaces when exposed to the same sputtering condition. Most of the dentin boding systems showed hermetic seals
Above results suggest that the dentin conditionings removed smear layers completely and the applied adhesive resins penetrated into the partially demineralized dentin and formed a resin-impregnated layer. It seems that the hybrid layers will
contribute
to the micromechanical retention of restoration and to the reduced microleakage at the resin/dentin interface.
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