IADR Abstract Archives
Shear Bond Strength of Metal Brackets to Enamel Using Total Etch vs. Self Etch Techniques
Objectives: Bonding brackets to enamel require proper conditioning of the surface using phosphoric acid +resin-based cement. Self-etching primers were introduced to simplify the steps of etching and priming. The purpose of this study was to evaluate shear bond strength to enamel using total etch and self-etch techniques.
Methods: Thirty extracted caries-free human premolars were cleaned and embedded in acrylic, leaving the enamel surface exposed for bonding. Fifteen teeth (group 1) were prepared using total etch technique, ALLBOND Universal (BISCO Inc. Schaumburg, IL) was applied following manufacturer's instructions. Fifteen teeth (group 2) were prepared using a ALLBOND Universal as a self-etching primer following manufacturer's instructions, LIGHT-BOND bracket adhesive (RELIANCE ORTHODONTICS, Itasca IL) was used on all brackets and then placed on the enamel surface, light cured for 30s. Teeth were stored in water (37C) for 2hrs. Shear bond strength test was performed using a universal testing machine (INSTRON, Norwood MA), using a flat blade at a crosshead speed of 5mm per min. Data was gathered in Kgs. and converted to MPa. T-Test was performed to determine differences between the groups (p<0.05).
Results: Group 1 exhibited a mean value of 17.74 MPa (sd=4.34) , group 2 exhibited a mean value of 9.35 MPa (sd=3.06). After comparing the means of the two samples it was found that confidence interval for the difference between the means, extended from 5.20445 to 10.9782. Since the interval does not contain the value 0, there is a statistically significant difference between the means of the samples at 95.0% confidence level
Conclusions: We can conclude that total etch technique will yield higher bond strength results to enamel, than those obtained when using a self etching primer, thus, using a total etch technique might be considered appropriate for bracket bonding to enamel.
Methods: Thirty extracted caries-free human premolars were cleaned and embedded in acrylic, leaving the enamel surface exposed for bonding. Fifteen teeth (group 1) were prepared using total etch technique, ALLBOND Universal (BISCO Inc. Schaumburg, IL) was applied following manufacturer's instructions. Fifteen teeth (group 2) were prepared using a ALLBOND Universal as a self-etching primer following manufacturer's instructions, LIGHT-BOND bracket adhesive (RELIANCE ORTHODONTICS, Itasca IL) was used on all brackets and then placed on the enamel surface, light cured for 30s. Teeth were stored in water (37C) for 2hrs. Shear bond strength test was performed using a universal testing machine (INSTRON, Norwood MA), using a flat blade at a crosshead speed of 5mm per min. Data was gathered in Kgs. and converted to MPa. T-Test was performed to determine differences between the groups (p<0.05).
Results: Group 1 exhibited a mean value of 17.74 MPa (sd=4.34) , group 2 exhibited a mean value of 9.35 MPa (sd=3.06). After comparing the means of the two samples it was found that confidence interval for the difference between the means, extended from 5.20445 to 10.9782. Since the interval does not contain the value 0, there is a statistically significant difference between the means of the samples at 95.0% confidence level
Conclusions: We can conclude that total etch technique will yield higher bond strength results to enamel, than those obtained when using a self etching primer, thus, using a total etch technique might be considered appropriate for bracket bonding to enamel.