The Effect of Enamel Roughness with Different Burs Preparation on The Adhesion of Resin Composite by Eighth-Generation Bonding Agent

Аннотация

OBJECTIVE The aim study to evaluates the effect of different diamond bur roughness on the shear bond strength of resin-based composite to the enamel superficial microroughness This may affect adhesion by modifying the substrates' characteristics when using an eighth-generation bonding agent adhesive. MATERIALS AND METHODS The 40 premolars were embedded in acrylic resin blocks, Samples were distributed 10 Samples into 4 groups according to burs: black, white, yellow burs, and polishing (control) prepared buccally with in the enamel flat surface, followed applied by eighth-generation bonding agent and A heavy-body silicone mold was used to form an accurate template for composite application, applied with composite resin restoration and polymerization. Shear bond strength (SBS) was tested using a Zwick Roell universal testing machine, and failure modes were analyzed. RESULTS showed white bur group exhibited the highest shear bond strength (SBS), with a mean value of 0.80 ± 0.118 MPa followed by yellow bur group 0.54 ± 0.119 MPa, followed by black bur group showed of 0.40 ± 0.071 MPa, followed by pumice polishing group had the lowest bond strength, at 0.34 ± 0.053 MPa, significant differences between the 4 uses groups (P value < 0.001). CONCLUSION. enamel surface roughness created by white diamond burs considerably influences the shear bond strength of resin bonded restorations.