A laboratory investigation to compare enamel preparation by sandblasting or acid etching prior to bracket bonding.
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 mu 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 degrees C in distilled water, shear debonding force was 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).
Department of Child Dental Health, Newcastle Dental School, Newcastle Upon Tyne, UK.
A E
AE
Sargison
J F
JF
McCabe
D T
DT
Millett
D000134:Acid Etching, Dental / Q000379:methods*; D000269:Adhesives / Q000737:chemistry; D000537:Aluminum Oxide; D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000648:ultrastructure*; D003799:Dental Stress Analysis / Q000295:instrumentation; D004868:Equipment Failure; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D010756:Phosphoric Acids; D010865:Pilot Projects; D011336:Probability; D019279:Resin Cements / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
D000269:Adhesives; D003188:Composite Resins; D003722:Dental Alloys; D010756:Phosphoric Acids; D019279:Resin Cements; C071164:Right-On cement; D013193:Stainless Steel; D000537:Aluminum Oxide