Bond of a Novel Universal Adhesive to Restorative and Tooth

Objectives: To measure the 24 hour and thermocycled shear bond strength (SBS) of an improved universal bonding agent (UA) (3M) to 5 restorative materials (Feldspathic porcelain, LAVA Frame, IPS e.max CAD, Type IV gold and a base metal alloy) compared to 2 other adhesives, and also to measure the universal bonding agent (UA) (3M) to unetched and etched human dentin and enamel compared to 4 other adhesives.
Methods: 128 caries free human molar teeth were collected following IRB approval. The teeth were ground with abrasive disks (ending with 400 grit) to flatten enamel and dentin occlusal surfaces. Each bonding adhesive was applied to the flattened surfaces following manufacturers’ instructions. Specimens were prepared by etching enamel and dentin with phosphoric acid etching (32%, 15 seconds). The adhesives were applied and cured (Elipar Deep Cure (3M) curing light, >1020mW/cm²). The 2 UA were bonded to 5 restorative materials. A tube filled with Z100 (A2) (3M) composite resin (diameter-1.5mm) was placed over the adhesive and light-cured 40sec. All specimens were stored in an incubator at 37⁰C, half were debonded at 24 hours and the other half were thermocycled and stored for 3 months in water. Both were loaded in shear to failure, at a 1mm/min cross-head speed. Bond strengths were calculated and data analyzed using 3-way ANOVA and Tukey test (p=0.05).
Results: Shown in table-1 and table-2.
Mean bond strength (MPa) (n=8).
Conclusions: There were no significant difference between materials on any other than etch enamel. On Etched enamel there was a significant difference, between SBU and P&B NT (p=0.01).