Shear strength evaluation of composite–composite resin associations

Ribeiro, José Carlos Rabelo; Gomes, Priscila Nogueira; Moysés, Marcos Ribeiro; Dias, Sérgio Candido; Pereira, Luciano José; Ribeiro, João Gustavo Rabelo

doi:10.1016/j.jdent.2008.01.015

« Previous Next »Journal of Dentistry
Volume 36, Issue 5 , Pages 326-330, May 2008

Shear strength evaluation of composite–composite resin associations

José Carlos Rabelo Ribeiro
- Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil
Priscila Nogueira Gomes
- Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil
Marcos Ribeiro Moysés
- Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil
Sérgio Candido Dias
- Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil
Luciano José Pereira
- Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, MG, Brazil
- Corresponding author at: Universidade do Vale do Rio Verde, Av: Castelo Branco, 82 Bairro: Chácara das Rosas, CEP: 37410000, Três Corações, Minas Gerais, Brazil. Tel.: +55 35 3239 1276; fax: +55 35 3235 2513.
João Gustavo Rabelo Ribeiro
- São Paulo State Dental School, UNESP, Araraquara, SP, Brazil

Received 14 November 2007; received in revised form 30 January 2008; accepted 31 January 2008.

Abstract

Objective

The aim of this study was to investigate the shear strength between distinct associations of different commercial composite resins and their fracture modes.

Methods

Nine composite–composite associations (n=90) were prepared for shear strength evaluation and separated into the following groups: Z/Z (Filtek Z250 UD+Filtek Z250 A2); Z/D (Filtek Z250 UD+Durafill VS A2); Z/S (Filtek Z250 UD+Filtek Supreme YT); C/C (Charisma OA2+Charisma A2); C/D (Charisma OA2+Durafill VS A2); C/S (Charisma OA2+Filtek Supreme YT); H/H (Herculite XRV B2D+Herculite XRV B2E); H/D (Herculite XRV B2D+Durafill VS A2); H/S (Herculite XRV B2D+Filtek Supreme YT). Shear tests were carried out using universal mechanical test equipment with a load of 200kgf and speed of 0.5mm/min. Ultimate shear strength data (MPa) from all tested groups were submitted to analysis of variance (one-way ANOVA) and the Tukey test. The fractured surfaces of the test samples were visually evaluated by binocular stereomicroscope at 20 times magnification. Fractures were classified as either adhesive or cohesive or mixed.

Results

The highest ultimate shear strength observed for composite–composite associations was found for the groups: Z/Z, C/S, H/H, H/S, Z/S and C/C. Those associations containing the Durafill resin were weaker than the others.

Conclusion

Microparticle RBC associations presented lower shear strength than hybrid and/or nanoparticle RBC associations, once the only significant difference was found when the Durafill resin was involved.

Keywords: Composite repair, Dental materials, Shear strength, Nano-fillers, Micro-fillers, Hybrid fillers