RETAINED EXCESS RESIN CEMENT AROUND TISSUE LEVEL IMPLANTS USING TWO DIFFERENT CEMENTATION TECHNIQUES (AN IN VITRO STUDY)

Authors

1 B.D.S. Faculty of Dentistry Alexandria University and Instructor of Conservative Dentistry, Alexandria University, Alexandria, Egypt.

2 Professor of Conservative Dentistry, Faculty of Dentistry Alexandria University

Abstract

INTRODUCTION: The main disadvantage of a resin cement-retained implant fixed prosthesis is the entrapment of residual excess cement in the peri-implant tissues. Remaining cement has been shown to be associated with peri-implant inflammation and bleeding. OBJECTIVES: The aim of this study was to detect the retained excess resin cement around tissue level dental implants, and to determine which method of cementation will show less amount of retained excess cement. MATERIALS AND METHODS: Fourteen tissue level implants (OCO Biomedical, Inc. Albuquerque, U.S.A.) were embedded in drilling models (Salvin Dental Specialties, Inc. Charlotte, U.S.A.) having rubber surface covering simulating the gingiva. Fourteen metal copings were fabricated (Realloy e.k, Sliemsdyk 50, Krefeld, Germany). RelyX U200 (TM3M, ESPE Dental Products. St. Paul, U.S.A.) dual cure resin cement was used for cementation of the metal copings to the implants. The implants were divided into two main groups according to cementation technique (n=7): Group (A): non vented tack curing of the excess cement for three seconds then the excess resin cement was carefully removed. Group (B): occlusal vent was performed on the occlusal surface of the metal copings to allow excess cement to be extruded through the vent hole; then all the excess cement from the vent and margins was removed. The rubber coverage was removed and the retained cement was collected and the net weight of the retained cement was determined. RESULTS: Mann-Whitney U test revealed a statistically significant differences (p < 0.05) between the non-vented tack cure and the occlusal vent groups in the amount of retained excess cement, with the occlusal vent group (B) had more excess cement percentage than the non vented tack cure group (A). CONCLUSIONS: Tack curing of the excess resin cement during the cementation of implant-supported restorations might reduce the cement residue, but still couldn’t remove the problem of excess resin cement around dental implants.

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References

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