Shear Bond Strength of Brackets Rebonded with a Fluoride-Releasing and -Recharging Adhesive System

Abstract

Objective: To ascertain the effects of repeated bonding on the shear bond strength of orthodontic brackets bonded with a fluoride-releasing and -recharging adhesive system with a self-etching primer in comparison with two other types of adhesive system. Materials and Methods: A total of 48 premolars were collected and divided equally into three groups of 16. Each group was assigned one of three adhesive systems: Transbond XT, Transbond Plus, or a fluoride-releasing and -recharging adhesive system, Beauty Ortho Bond. Shear bond strength was measured 24 hours after bracket bonding, with the bonding/debonding procedures repeated twice after the first debonding. A universal testing machine was used to determine shear bond strengths, and bracket/adhesive failure modes were evaluated with the adhesive remnant index after each debonding. Results: At every debonding sequence, all of these three adhesive systems had a shear bond strength of 6 MPa, which is a minimum requirement for clinical use. Transbond XT and Transbond Plus had significantly higher mean shear bond strengths than did Beauty Ortho Bond at each debonding. No significant differences in mean bond strength were observed between the three debondings in each adhesive system. Bond failure at the enamel/adhesive interface occurred more frequently in Beauty Ortho Bond than in Transbond XT or Transbond Plus. Conclusions:The fluoride-releasing and -recharging adhesive system with the self-etching primer (Beauty Ortho Bond) had clinically sufficient shear bond strength in repeated bracket bonding; this finding can help orthodontists to decrease the risk of damage to enamel at debonding. (Angle Orthod. 2009;79:564-570.)

Shear bond strength of orthodontic brackets bonded with resin coating material

“…The null hypothesis tested that there were no significant differences in SBS between the orthodontic bracket bonding system using resin coating material and the previous orthodontic bracket bonding systems was partially rejected. Some investigators have reported that the SBS of the resin composite cement (Transbond XT, 3M Unitek) system was comparable with that of the RMGIC system 6) , while others have reported that it was significantly higher than that of the resin composite cement (BOB) system with the self-etching primer 14) . Based on these previous findings, our result showing that the RMGIC system (group 1, 11.7 MPa) exhibited a significantly higher mean SBS than the BOB system combined with the self-etching primer (group 2, 9.6 MPa) might be expected.…”

Evaluation of enamel loss by scanning electron microscopy after debonding brackets place with four different adhesives

“…Reports suggest damage to the enamel during debonding, this could be due to; the debonding method, bracket type, mesh type, surface area of the mesh, etching method, or the adhesive system (Bosh, Kaufman, Balabanovsky, & Vardimon, 2015; Endo et al, 2009; Pickett et al, 2001; Samruajbenjakul & Kukiattrakoon, 2009). In the present study, enamel loss occurred in 10% of the total samples, which is evident through the presence of enamel prisms in the images obtained through SEM.…”

“…The present study obtained values of G1 = 10.09 ± 2.73 MPa, G2 = 9.27 ± 3.99 MPa, G3 = 7.83 ± 4.46 MPa, and G4 = 6.40 ± 2.85 MPa, using different debonding methods (shear behind the upper fins) (Bosh et al, 2015). The adequate SBS for safety orthodontic debonding should be from 2.80 and 10 MPa so there is not a damage or enamel loss (Endo et al, 2009; Pickett et al, 2001; Samruajbenjakul & Kukiattrakoon, 2009). Nevertheless, we observed damages and enamel loss; this could be due to inclusion criteria, debonding method, debonding time, and bracket area.…”

Effect of bonding brackets by sulphated polyacrylic vs. Conventional acid etching on deciduous and permanent enamel

“…Bond strengths between 6 and 8 MPa are clinically sufficient for successfully bonding orthodontic brackets to enamel [24][25][26][27][28] . Our findings showed that the shear bond strengths of all the 4 groups were higher than the clinically required range of 6 to 8 MPa.…”