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KMID : 0988420020140010042
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Journal of Dental Science (C.N.U.)
2002 Volume.14 No. 1 p.42 ~ p.52
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Shear Bond Strength of Repaired Composite Resin Restorations
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Abstract
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This study was performed to evaluate the interfacial shear bond strength of base (direct and indirect) and repair composites with aging and surface treatment methods.
Direct composite resin specimens (Charisma^(r), Heraeus Kulzer, Germany) were aged for 5min, 1hour, 24hour, and 1week in 37℃ distilled water before surface treatment, and then divided into five groups:Group 1, grinding; Group 2, grinding and application of bonding agent;Group 3, grinding, etching with 37% phosphoric acid for 30sec, and application of bonding agent;Group 4, grinding, etching with 37% phosphoric acid for 30sec, silane treatment, and application of bonding agent;Group 5, grinding, etching with 4% hydrofluoric acid for 30sec, silane treatment, and application of bonding agent.
Indirect composite resin specimens (Artglass^(r), Heraeus Kulzer, Germany) were aged for 1week in 37℃ distilled water and divided into seven groups:Group 1-Group 5, equal to Charisma specimens;Group 6, grinding, etching with 37% phosphoric acid for 60sec, silane treatment, and application of bonding agent;Group 7, grinding, etching with 4% hydrofluoric acid for 60sec, silane treatment, and application of bonding agent.
The repair material(Charisma^(r)) was then added on the center of the surface (5mm in diameter, 5mm in height). The shear bond strength was tested and the data was analyzed using one-way ANOVA and the Student-Newman-Keuls test.
The following conclusions were drawn.
1. The shear bond strength of Charisma^(r) specimens aged for 1hour was significantly higher in Group 2 and Group 5 than in Group 1 (p<0.05), and that of Charisma^(r) specimens aged for 1week was significantly higher in Group 3 and Group 5 than in Group 1 (p<0.05). No significant difference was found in the bond strength of specimens aged for 5min and 24hours.
2. In Group 2 of the Charisma^(r) specimens, there was significant difference between the bond strength of 24hours and that of 1week (p<0.05).
3. In Group 4 of the Charisma^(r) specimens, the shear bond strength of specimens aged for 24hours was significantly higher than the others(p<0.05).
4. There was no significant difference between the shear bond strength of the Artglass^(r) specimens.
5. Most of the Charisma^(r) specimens showed cohesive fractures. Artglass^(r) specimens that were etched with acid (phosphoric or hydrofluoric) for 30sec showed more cohesive fractures.
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