44803
document
Effect of enamel pretreatment on shear bond strength of brackets bonded with resin-modified glass-ionomer cement . AIM To evaluate the shear bond strength of brackets bonded with resin-modified glass-ionomer cement ( RMGIC ) using various methods of enamel conditioning . METHODS Forty-five human premolars were randomly divided into five groups . The roots of these teeth were fixed in acrylic resin cylinders , and brackets were bonded to the teeth 's crowns using the following material combinations : RMGIC only ; RMGIC and corresponding primer ; RMGIC , acid etching , and Scotchbond Multipurpose ; RMGIC and two-step self-etching primer ; and RMGIC and one-step primer . All specimens were submitted to pH cycling for 14 days before shear bond strength was assessed in a universal test machine . RESULTS The medians and standard deviations ( in MPa ) were RMGIC only = 8.34 ± 1.11 ; RMGIC and corresponding primer = 7.05 ± 2.24 ; RMGIC , acid etching , and Scotchbond Multipurpose = 7.00 ± 4.79 ; RMGIC and two-step self-etching primer = 0.54 ± 0.30 ; and RMGIC and one-step primer = 10.61 ± 4.58 . The value for RMGIC and two-step self-etching primer was significantly lower than all other values . CONCLUSION It can be concluded that the tested RMGIC is suitable for bonding orthodontic brackets , even when used by itself . Different enamel preparations do not improve its performance . However , they can worsen its bonding capacity as the combination with the two-step primer system clearly shows .
44804
Intervention_Pharmacological
enamel pretreatment
44805
Intervention_Pharmacological
resin-modified glass-ionomer cement ( RMGIC )
44806
Intervention_Physical
enamel
44807
Intervention_Pharmacological
RMGIC
44808
Intervention_Pharmacological
primer
44809
Intervention_Pharmacological
acid etching
44810
Intervention_Pharmacological
Scotchbond
44811
Intervention_Pharmacological
RMGIC
44812
Intervention_Pharmacological
RMGIC
44813
Outcome_Physical
shear bond strength
44814
Outcome_Physical
shear bond strength
44815
Outcome_Physical
bond strength
44816
Participant_Condition
brackets bonded with resin-modified glass-ionomer cement
44817
Participant_Sample-size
Forty-five