Comparison of Pull-Out Resistance Different Luting Cements at Implant Supported Fixed Prosthesis

Purpose: One of the most important factors that effects retention of cement-retained implant supported fixed prosthesis is used the type of the luting cement. The resistance of the luting cements against the displacing forces on the fixed prosthesis directly influence the success of the restorations.The purpose of this study is to compare the retentive properties of three different dental luting cements that are being used routinely on cement retained implant supported fixed prosthesis. Material and methods: Resin based, glass ionomer and zinc phosphate luting cements, widely used inclinically, were used in this study. 21 dental implant abutment and 21 dental implants laboratory analogs were used. Metallic crowns per abutment was obtained by casting. Dental implant laboratory analogs were mounted in autopolimmerization acrylic resin blocks. They were divided into three groups according to types of luting cements. Dental implant laboratory analogs were paired with abutments and cast metallic crowns .Dental implant laboratory analogs incorporated with abutments and using a dental surveyor were aligned vertically and centrally positioned within acrylic blocs. Three different types of luting c ements were prepared according to manufacturer’s recommendation and in uniform concistency and metallic crowns cemented using finger pressure. After 24 hours, the specimens were subjected to a pull-out test using an universal testing machine. Results: According to this study, zinc phosphate luting cement showed the highest pull-out resistance and glass ionomer luting cement showed the lowest. Conclusion: In order to increase the retention of cement-retained implant supported fixed prosthesis, the us e of zinc phosphate luting cementis recommended.