Aim: To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a recently introduced adhesive containing 10-methacryloyloxydecyle dihydrogen phosphate (10-MDP) (Panavia F2) and comparing it with two other bonding systems, Transbond XT and Fuji Ortho LC. Methods: Three groups, each consisting of 20 porcelain premolars, were bonded with metal orthodontic brackets (0.022 MBT) using 10-MDP (group I), Transbond XT (group II), and Fuji Ortho LC (group III). All ceramic surfaces were etched with 9.6% hydrofluoric acid followed by application of a silane coupling agent prior to bonding. All specimens were stored in artificial saliva at 37°C for 24 hours and thermocycled between 5°C and 55°C for 500 cycles before debonding with an Instron universal testing machine. The shear bond strength, adhesive remnant index, and sites of bond failure were recorded. Differences between the groups were statistically analyzed using ANOVA, Tukey HSD, and Pearson chi-square tests. Results: Group I (12.52 ± 3.64 MPa) had the highest shear bond strength as compared with group II (9.45 ± 4.58 MPa) and group III (9.53 ± 2.55 MPa) (P < .05). The ARI scores of all the three groups showed no significant differences among the groups. However, porcelain damage was visible in some samples in all groups. Conclusion: Group I samples bonded with 10-MDP exhibited the highest mean shear bond strength, but the risk of porcelain damage necessitates caution. ORTHODONTICS (CHIC) 2012;13:e29–e36.
Key words: 10-methacryloyloxydecycle dihydrogen phosphate, ceramic, shear bond strength