Comparative evaluation of shear bond strength of universal bonding agent and total-etch bonding agent on superficial and deep dentin

Background: To conserve the tooth structure, bonded restorations are popular nowadays. Bonding to enamel is predictable by acid-etch technique. However, bonding dentin remains a challenge. Aim: determine better agent between universal and total-etch agents based on shear bond strength using testing machine.
 Methodology: Eighteen human permanent mandibular molars were sectioned longitudinally obtain thirty-six samples. Samples randomly divided into three groups according agent, Group A (Unbonded), B (Universal agent) which was again Subgroup B1 (Superficial dentin), B2 (Deep dentin) C (total-etch c1 ,Subgroup c2 dentin). Composite block built up samples mounted in acrylic resin. Thermocycling done then subjected Universal machine. Statistical Analysis: The data analysed One-way ANOVA Post hoc tests. Result: showed higher mean than at both superficial deep level. Conclusion: strengths of affected level i.e., dentin.