Traction required for removal of cemented cast crown copings in dental implant abutments.

Abstract

Introduction: Implant-supported fixed prostheses are alternative treatments increasingly common in dental clinics. They can be screwed or cemented depending on the surgical planning. Screwed prostheses are reversible, have greater bacterial infiltrate, aesthetics impaired by the screw hole. Cemented prostheses have reversal difficulties, loss of the prosthesis in case of screw loosening and better aesthetics due to the lack of screw hole.

Objectives: In this context, the present study aims to evaluate the tensile strength levels of cemented copping´s by 2 different types of cement for fixation of cemented implant-supported crowns.

Methodology: Three specimens were made with implants and crowns cemented with different materials, where each of these specimens was submitted to a traction test.

Results: Zinc phosphate cemented copping's (CP1 and CP4) required a tensile strength of 118.02 N and 213.63 N respectively, while resin cemented copping's (C2 and C3) required a tensile strength of 258.93 N and 228.87 N respectively.

Conclusion: Within the limitations of the current in vitro conditions employed in this study, retention of cemented crown copping's in the resin abutment and zinc phosphate cement implant abutments was significantly affected by the cement type. Resin cement required significantly higher tensile strength than zinc phosphate cement for removal of copipngs.