تأثير انواع مختلف سمان هاي موقت روي استحكام كششي روكش هاي متكي بر ايمپلنت

Effect of different types of temporary cements on the tensile strength of implant supported crowns

Background and Aim: Using provisional luting agents in cemented type implant supported prosthesis has advantage of retrievability; however adequate retention is demanded. This study compared the retention of restoration cemented with different types of provisional luting agents. Materials & Methods: In this experimental study, thirty titanium implant abutments (Biohorizons) with 8mm height, were placed in implant analogs and torqued to 30 M/cm. Implant analogous were mounted in autopolymerizing acrylic resin blocks using surveyor. After casting crowns for each abutment, provisional luting agents TempBond, Dycal and TempBond NE were used to cement the restorations upon their respective abutments. All specimens were stored in 100% humidity for 48 hours at 37 C prior to testing. Each crown was pulled from the abutment with a 500 kg load in a universal testing machine at a crosshead speed of 0.5 cm/min, and tensile strength was recorded in Newton. Data were analyzed using ANOVA. Results: Tensile strength was significantly higher for Dycal (26.01±3.53) than for TempBond NE (22.00±3.06) and TempBond (15.60±2.67). Conclusion: When retrievability of implant supported prosthesis is desired, Temp Bond is suggested to be a better choice and Dycal when additional retention for prosthesis is required.