In-VitroComparativeStudyofBondStrengthinAll-MetalCrownsUsingDifferentLutingCementsandSurfaceTreatments

This study aims to measure and compare the bonding strengths of different kinds of metal-crowns with varying luting cement types and surface-treatment techniques. Forty-eight premolars were used in the study, divided equally into three groups. To standardise all tooth preparations, teeth were prepared with the taper set to 0. after verifying 0-degree taper, wax pattern was fabricated on each tooth, a ring was attached on the wax pattern and casting was done. Following casting, the metal-crowns were cemented using resin modified glass ionomer cement (RMGIC) and dual-cure resin cement. Subsequently, all specimens underwent tensile bond strength testing using a universal testing machine at a cross speed of 1 mm/min. In the result both type of luting-agent and surface-treatment had a evident effect on retention. The metal-crowns that didn’t underwent any surface-treatment showed  the lowest bond-strengths. The group surface-treated by 110 μm alumina sandblasting and ultrasonic-cleaning offered the maximum bond-strength. When it came to luting agents, Dual- cure resin cement had the maximum bond-strength while RMGIC displayed the lowest bond- strength. Among all the surface-treatments investigated in this research, the combination of sandblasting with 110μm alumina and ultrasonic-cleaning yielded the maximum bond- strength. Furthermore, dual-cure resin cement appeared as the most effective luting-agent.