TITLE:
Bond Strength of Brackets Bonded with Chemically and Light Activated Materials after Thermal Cycling
AUTHORS:
Rafael Menezes-Silva, Leonardo Amaral dos Reis, Bhenya Otonni Tostes, Dhelfeson Willyan Douglas de Oliveira, Maria Helena Santos
KEYWORDS:
Dental Bonding, Orthodontic Brackets, Orthodontics
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.5 No.9,
September
2,
2015
ABSTRACT: The
aim of this study was to evaluate the bond strength of orthodontic brackets
bonded to tooth enamel with different polymer composites after simulated
clinical aging, and analyze the enamel/ bond system fracture interface. 80
human premolars, were randomly divided into five groups (n = 16). G1: CO (Concise
Ortodontica—3M ESPE), G2: SB (SuperBond—Ortho Source), G3: FMO (Fill Magic
Ortodontico—Vigodent), G4: TXT (Transbond XT—3M ESPE) and G5: TP
(Transbond Plus Self Etching Primer + Transbond Plus Color Change—3M ESPE). In
all groups, the metal orthodontic bracket was bonded to the tooth enamel
surface. The specimens were submitted to 3000 thermal cycling baths for 30 s,
at temperatures of 5°C, 37°C and 55°C (±1°C). Afterwards they were subjected to
shear testing and the results were analyzed by the Student’s-t test (p G5 > G2 > G3. In all groups the majority of the
fractures at the interface of the specimens were cohesive, except in G3, which
presented the largest number of adhesive fractures. After clinical aging, the
chemically activated material (CO) showed higher bond strength than the light
activated types (FMO, TXT and TP). The self-etching adhesive system (TP) showed
similar bond strength to that of conventional systems (FMO and TXT).