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- Original Article Self-adhesion of low-viscosity composites to dentin surface
- Tae-Hee Cho, Kyoung-Kyu Choi, Sang-Hyuk Park, Sang-Jin Park
-
2003;28(3):-221.
DOI: https://doi.org/10.5395/JKACD.2003.28.3.209
Published online: May 31, 2003
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- Corresponding author (psangjin@khu.ac.kr)
Copyright © 2003 Korean Academy of Conservative Dentistry
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Abstract
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The objectiveness of this study was to evaluate whether low-viscosity composite can bond effectively to dentin surface without bonding resin. The low-viscosity composites being 50wt% filler content were made by the inclusion of bonding resin of two self-etching systems(Clearfil SE Bond, Unifil Bond) varied with contents as 0, 10, 20, 30, 40, 50wt%.Exposed dentin surfaces of extracted 3rd molars are used. Dentin bond strengths were measured. The tests were carried out with a micro-shear device placed testing machine at a CHS of 1mm/min after a low-viscosity composite was filled into an iris cut from micro tygon tubing with internal diameter approximately 0.8mm and height of 1.0mm.
Flexural strength and modulus was increased with the addition of bonding resin.
Micro-shear bond strength to dentin was improved according to content of bonding resin irrespective of applying or not bonding resin in bonding procedure, and that of Clearfil SE Bond groups was higher than Unifil Bond.
There were no significant difference whether use of each bonding resin in bonding procedure for S-40, S-50, U-50(p>0.05).
In SEM examination, resin was well infiltrated into dentin after primed with self-etching primer only for S-50 and U-50 in spite of the formation of thinner hybrid layer.
Low viscosity composite including some functional monomer may be used as dentin bonding resin without an intermediary bonding agent. It makes a simplified bonding procedure and foresees the possibility of self-adhesive restorative material.
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REFERENCES
Fig. 6
SEM image of interfaces bonded with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-0 resin. Note the well-formed resin tags with lateral branches and homogeneous thicker hybrid layer. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-0 resin directly. An inconsistent and thinner hybrid layer and a decreased number of tags were formed.
Fig. 7
The adhesive interfaces with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-20 resin. Hybrid layer was formed uniformly and resin tags were infiltrated into dentinal tubules deeply. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-20 resin directly. Note few tags relatively and uneven hybrid layer.
Fig. 8
The adhesive interfaces with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-50 resin. Hybrid layer was well-formed uniformly and a number of resin tags and canaliculi were observed. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-50 resin directly. In spite of thinner hybrid layer relatively, the presence of a great number of long tags were observed.
Fig. 9
SEM image of interfaces bonded with Unifil Bond. (a) as the manufacturer's instruction and bonded with U-0 resin. Note uniform hybrid layer but the poorly-formed resin tags. (b) Specimen primed with self-etching primer of Unifil Bond without bonding resin applied and bonded with U-0 resin directly. Hybrid layer was thin and inconsistent and there was scarcely any tag.
Fig. 10
SEM image of interfaces primed with self-etching primer of Unifil Bond and bonded with U-20 resin replacing the bonding resin. (a) Note resin infiltrated into dentinal tubule very well and lateral braches at 1,500× of magnification. (b) Magnified(×6,000) image of white box area in (a) micrograph. The hybrid layer is approximately 1~2µm thick, the resin tags exhibit some few tags relatively thinner hybrid layer.
Fig. 11
The adhesive interface with Unifil Bond. (a) as the manufacturer's instruction and bonded with U-50 resin. Hybrid layer was well-formed uniformly and a number of resin tags were observed. (b) Specimen primed with self-etching primer of Unifil Bond without bonding resin applied and bonded with U-50 resin directly. In spite of thinner hybrid layer relatively, the presence of a great number of long tags were observed.
Tables & Figures
REFERENCES
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Fig. 1
Schematic diagram for micro-shear bond test.
Fig. 2
Comparison of flexural strength.
Fig. 3
Relation between contents of bonding resin and flexural.
Fig. 4
Comparison between bond strength with or without applying bonding resin for Clearfil SE Bond.
Fig. 5
Comparison between bond strength with or without applying bonding resin for Unifil Bond.
Fig. 6
SEM image of interfaces bonded with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-0 resin. Note the well-formed resin tags with lateral branches and homogeneous thicker hybrid layer. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-0 resin directly. An inconsistent and thinner hybrid layer and a decreased number of tags were formed.
Fig. 7
The adhesive interfaces with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-20 resin. Hybrid layer was formed uniformly and resin tags were infiltrated into dentinal tubules deeply. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-20 resin directly. Note few tags relatively and uneven hybrid layer.
Fig. 8
The adhesive interfaces with Clearfil SE Bond. (a) as the manufacturer's instruction and bonded with S-50 resin. Hybrid layer was well-formed uniformly and a number of resin tags and canaliculi were observed. (b) Specimen primed with SE Primer without bonding resin applied and bonded with S-50 resin directly. In spite of thinner hybrid layer relatively, the presence of a great number of long tags were observed.
Fig. 9
SEM image of interfaces bonded with Unifil Bond. (a) as the manufacturer's instruction and bonded with U-0 resin. Note uniform hybrid layer but the poorly-formed resin tags. (b) Specimen primed with self-etching primer of Unifil Bond without bonding resin applied and bonded with U-0 resin directly. Hybrid layer was thin and inconsistent and there was scarcely any tag.
Fig. 10
SEM image of interfaces primed with self-etching primer of Unifil Bond and bonded with U-20 resin replacing the bonding resin. (a) Note resin infiltrated into dentinal tubule very well and lateral braches at 1,500× of magnification. (b) Magnified(×6,000) image of white box area in (a) micrograph. The hybrid layer is approximately 1~2µm thick, the resin tags exhibit some few tags relatively thinner hybrid layer.
Fig. 11
The adhesive interface with Unifil Bond. (a) as the manufacturer's instruction and bonded with U-50 resin. Hybrid layer was well-formed uniformly and a number of resin tags were observed. (b) Specimen primed with self-etching primer of Unifil Bond without bonding resin applied and bonded with U-50 resin directly. In spite of thinner hybrid layer relatively, the presence of a great number of long tags were observed.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Self-adhesion of low-viscosity composites to dentin surface
The materials used in this study
Experimental composites classified by contents of bonding agent in this study.
*S-0 and U-0 are same composite(cont.=control group).
Flexural strength of experimental composites(MPa±SD).
*Same superscript means no statistical difference.
Flexural modulus of experimental composites(GPa±SD).
*Same superscript means no statistical difference.
Micro-shear bond strength with or without applying bonding procedure (MPa±SD).
*Same superscript means no statistical difference.
Table 1
The materials used in this study
Table 2
Experimental composites classified by contents of bonding agent in this study.
*S-0 and U-0 are same composite(cont.=control group).
Table 3
Flexural strength of experimental composites(MPa±SD).
*Same superscript means no statistical difference.
Table 4
Flexural modulus of experimental composites(GPa±SD).
*Same superscript means no statistical difference.
Table 5
Micro-shear bond strength with or without applying bonding procedure (MPa±SD).
*Same superscript means no statistical difference.
