39099
document
Effect of light-cured filled sealant on shear bond strength of metal and ceramic brackets bonded with a resin-modified glass ionomer cement . INTRODUCTION Our objective was to evaluate the effects of a highly filled light-cured sealant ( HFLCS ) on the shear bond strength and bond failure site of metal and ceramic brackets bonded with resin-modified glass ionomer cement ( RMGIC ) . METHODS Eighty freshly extracted maxillary premolars were randomly divided into 4 groups ( 20 in each group ) . In all groups , the teeth were etched with 37 % phosphoric acid for 20 seconds , and RMGIC ( Fuji Ortho LC , GC Europe , Leuven , Belgium ) was used for bracket bonding . In groups 1 and 3 , the brackets were bonded directly to etched enamel surfaces ; in groups 2 and 4 , the etched enamel was covered with HFLCS ( Pro Seal , Reliance Orthodontic Products , Itasca , Ill ) . Groups 1 and 2 received metal brackets , and groups 3 and 4 had ceramic brackets . The specimens were stored in distilled water at room temperature for 24 hours and subsequently tested in shear mode with a universal testing machine . After debonding , the teeth and the brackets were examined under a stereomicroscope ( model SMZ-1B , Nikon , Osaka , Japan ) at 20-times magnification to assess the residual adhesive on the tooth surfaces . RESULTS Interaction between HFLCS and bracket type was not statistically significant ( P = 0.15 ) . Pretreatment with HFLCS did not cause a statistically significant change in the shear bond values of either metal or ceramic brackets ( P = 0.38 ) . Shear bond values of the ceramic brackets were higher than those of the metal brackets independent of HFLCS application ( P < 0.001 ) . No significant differences were found in bond failure modes in the 4 groups . CONCLUSIONS HFLCS application on enamel etched with 37 % phosphoric acid did not affect the bond strength values and the bond failure modes of metal and ceramic brackets bonded with RMGIC . RESULTS Interaction between HFLCS and bracket type was not statistically significant ( P = 0.15 ) . Pretreatment with HFLCS did not cause a statistically significant change in the shear bond values of either metal or ceramic brackets ( P = 0.38 ) . Shear bond values of the ceramic brackets were higher than those of the metal brackets independent of HFLCS application ( P < 0.001 ) . No significant differences were found in bond failure modes in the 4 groups . CONCLUSIONS HFLCS application on enamel etched with 37 % phosphoric acid did not affect the bond strength values and the bond failure modes of metal and ceramic brackets bonded with RMGIC .
39100
Intervention_Physical
light-cured sealant ( HFLCS )
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Intervention_Physical
37 % phosphoric acid for 20 seconds
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Intervention_Physical
RMGIC ( Fuji Ortho LC , GC Europe , Leuven , Belgium )
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Intervention_Physical
HFLCS ( Pro Seal , Reliance Orthodontic Products , Itasca , Ill )
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Intervention_Physical
metal brackets
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Intervention_Physical
ceramic brackets
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Outcome_Other
shear bond values of either metal or ceramic brackets
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Outcome_Other
Shear bond values of the ceramic brackets
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Outcome_Other
bond failure modes
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Outcome_Other
bond strength values
39110
Outcome_Other
bond failure modes
39111
Outcome_Other
shear bond values of either metal or ceramic brackets
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Outcome_Other
Shear bond values of the ceramic brackets
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Participant_Sample-size
Eighty freshly extracted maxillary premolars