Shear bond strength of metal and ceramic brackets using conventional acid etch/primer and self-etch primer

Abstract

Aims: The aim of this in vitro study is to evaluate shear bond strength (SBS) of metal and ceramic brackets using conventional acid etch/primer and self-etch primer (SEP) adhesive systems. Methodology: Healthy, extracted 120 human premolar teeth were collected and were divided into group 1 – teeth bonded with metal brackets and group 2 – teeth bonded with ceramic brackets. These two groups were further subdivided: subgroup 1a – 30 metal brackets bonded using conventional acid etch/primer adhesive system, subgroup 1b – 30 metal brackets bonded using SEP, subgroup 2a – 30 ceramic brackets bonded using conventional acid etch/primer adhesive system, and subgroup 2b – 30 ceramic bracket bonded using SEP; brackets were debonded using a computerized universal Instron Testing Machine and the teeth were examined under ×10 magnification for adhesive remnants and scored according to modified adhesive remnant index (ARI). Results: The mean SBS of metal and ceramic brackets bonded using conventional acid etch/primer adhesive system showed higher bond strength than those bonded using SEP. Bond strength ranged from 7.25 to 12.23 MPa which was in the acceptable clinical range. Modified ARI scores calculated showed varied results. Conclusion: SBS values of all four subgroups exceeded the range of 6–8 MPa considered to be suitable for routine clinical use.

Keywords

• Ceramic brackets
• conventional acid etch/primer
• metal brackets
• self-etch primer
• shear bond strength