In vitro study demonstrates equivalent shear bond strength across four indirect bonding techniques in extracted teeth, suggesting all provide sufficient adhesion for clinical use.
Key Points
To evaluate and compare the shear bond strength of metal brackets bonded to human premolars using four distinct indirect bonding techniques.
Eighty extracted human premolars were randomly allocated into four equal groups (n = 20): Group I (Vashi technique), Group II (thermally cured composite technique), Group III (Guenther and Larson technique), and Group IV (Sondhi Rapid Set technique).
Standard 0.022-inch metal premolar brackets were bonded according to protocol and subjected to occluso-gingival shear force on a universal testing machine at a crosshead speed of 0.5 mm/min.
Mean shear bond strength peaked in Group I (Vashi technique) at 7.21 ± 3.15 MPa, whereas Group II (thermal-cured technique) produced the lowest values at 6.14 ± 1.93 MPa.
One-way analysis of variance demonstrated no statistically significant differences in shear bond strength among the four indirect bonding groups (F = 0.587, p = 0.637).