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A Laboratory Investigation to Compare Enamel Preparation by Sandblasting or Acid Etching Prior to Bracket Bonding

Present address: Department of Orthodontics, Sunderland Royal Hospital, Kayll Road, Sunderland, Tyne and Wear, UK.

J. F. McCabe, D.S.C.

Departments of Child Dental Health, and Dental Materials Science, Newcastle Dental School, Framlington Place, Newcastle Upon Tyne NE2 4BW, UK

D. T. Millett, B.D.SC., D.D.S., F.D.S., M.ORTH.

Department of Orthodontics, Glasgow Dental School, 378, Sauchiehall Street, Glasgow, G2 3JZ, UK

A laboratory investigation to compare the mean shear debonding force and mode of bond failure of metallic brackets bonded to sandblasted and acid-etched enamel is described. The buccal surfaces of 30 extracted human premolars were sandblasted for 5 seconds with 50 µ alumina and the buccal surfaces of a further 30 human premolars were etched with 37 per cent phosphoric acid for 15 seconds. Following storage for 24 hours at 37°C in distilled water, shear debonding forcewas measured using an Instron Universal Testing Machine with a cross-head speed of 10 mm/minute. Mean shear debonding force was significantly lower for brackets bonded to sandblasted enamel compared to acid etched enamel (P<0.001). Weibull analysis showed that at a given stress the probability of failure was significantly greater for brackets bonded to sandblasted enamel. Brackets bonded to etched enamel showed a mixed mode of bond failure whereas following sandblasting, failure was adhesive at the enamel/composite interface (P<0.01).

Key words: Debonding Force, Etching, Orthodontic Brackets, Sandblasting

Refereed Paper

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