Shear bond strength of repaired composite resin restorations

Soo-young Choi; Sun-Wa Jeong; Yun-Chan Hwang; Sun-Ho Kim; Chang Yun; Won-Mann Oh; In-Nam Hwang

doi:10.5395/JKACD.2002.27.6.569

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Choi, Jeong, Hwang, Kim, Yun, Oh, and Hwang: Shear bond strength of repaired composite resin restorations

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2002; 27(6): 569-576.

Published online: 30 November 2002

DOI: https://doi.org/10.5395/JKACD.2002.27.6.569

Shear bond strength of repaired composite resin restorations

Soo-young Choi, Sun-Wa Jeong^*, Yun-Chan Hwang, Sun-Ho Kim, Chang Yun, Won-Mann Oh, In-Nam Hwang

Department of Conservative Dentistry, College of Dentistry, DSRI, Chonnam National University, Korea.

^*Department of Dentistry, College of Medicine, Seonam University, Korea.

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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®, Heraeus Kulzer, Germany) were aged for 5 min, 1 hour, 24 hours, and 1 week 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®, Heraeus Kulzer, Germany) were aged for 1 week 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; Group7, grinding, etching with 4% hydrofluoric acid for 60 sec, silane treatment, and application of bonding agent.

The repair material(Charisma®) was then added on the center of the surface (5 mm in diameter, 5 mm 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® specimens aged for 1 hour was significantly higher in Group 2 and Group 5 than in Group 1 (p<0.05), and that of Charisma® specimens aged for 1 week 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 5 min and 24 hours.

2. In Group 2 of the Charisma® specimens, there was significant difference between the bond strength of 24 hours and that of 1 week (p<0.05).

3. In Group 4 of the Charisma® specimens, the shear bond strength of specimens aged for 24 hours was significantly higher than the others(p<0.05).

4. There was no significant difference between the shear bond strength of the Artglass® specimens.

5. Most of the Charisma® specimens showed cohesive fractures. Artglass® specimens that were etched with acid (phosphoric or hydrofluoric) for 30 sec showed more cohesive fractures.

Keywords: Shear bond strength, repaired resin, Indirect resin restorations

Figures and Tables

Fig. 1

The shear bond strength of Charism® specimens aged for 5 min.

Fig. 2

The shear bond strength of Charisma® specimens aged for 1 hr.

Fig. 3

The shear bond strength of Charisma® specimens aged for 24 hrs.

Fig. 4

The shear bond strength of Charisma® specimens aged for 1 wk.

Fig. 5

The shear bond strength of Artglass® specimens.

Fig. 6

Comparison of the shear bond strength of Charisma® specimens.

Table 1

The shear bond strength (MPa) of composite resin. (mean±S.D., n=5)

Table 2-1

Failure mode of Charisma® specimens.

Table 2-2

Failure mode of Artglass® specimens.

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