Effect of surface treatments on the bond strength of brackets bonded with a compomer.
OBJECTIVE
To evaluate the effectiveness of the compomer Dyract AP for bonding brackets when conditioning the enamel with phosphoric acid and a non-rinsing conditioner (NRC), in comparison with a control group in which the resin orthodontic adhesive system Transbond XT was used.


METHODS
The brackets were bonded to extracted premolars which were divided into three groups: (1) Acid/Transbond XT, (2) NRC/Dyract AP and (3) Acid/Dyract AP. Shear bond strength was measured with a universal testing machine. The crosshead speed was 1mm/minute. The adhesive remnant on the tooth after debonding was determined using image analysis equipment.


RESULTS
The bond strength of Acid/Transbond XT was significantly higher than bond strengths of Acid/Dyract AP and NRC/Dyract AP (P< 0.017). No significant differences were observed between Acid/Dyract AP and NRC/Dyract APBond strength values (P> 0.017). Acid/Transbond XT left significantly more adhesive on the tooth than Acid/Dyract AP and NRC/Dyract AP, whereas NRC/Dyract AP left significantly less adhesive than Acid/Dyract AP (P< 0.05).
Vicente
Ascensión
A
Unit of Orthodontics, Dental Clinic, University of Murcia, Hospital Morales Meseguer, Spain. ascenvi@um.es
Navarro
Raúl
R
Mena
Ana
A
Bravo
Luis A
LA
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D001641:Bicuspid; D020770:Compomers; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D008298:Maleates; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D018709:Statistics, Nonparametric
D020770:Compomers; C088486:Dyract; D005899:Glass Ionomer Cements; D008298:Maleates; D019279:Resin Cements; C477790:Transbond XT; C444699:non-rinse conditioner