Evaluation Of Marginal Accuracy Of Implant Supported Crown Obtained By Laser Metal Sintering Technique Fabricated On Gypsum Abutment And Epoxy Resin Abutment

Abstract

Background- the marginal fit of the prosthesis is important for the health of the soft tissues and remaining abutment structures. Discrepancy in the margins can lead to plaque accumulation, leaching out of luting agent and dislodgement of the cemented prosthesis is along with gingival inflammation. To replicate marginal accuracy in cement retained implant prosthesis, the die fabrication from the abutment level implant impression should be dimensionally stable and accurate.

Aim- aim of this study was to evaluate the marginal accuracy of implant supported crown obtained by laser metal sintering technique fabricated on gypsum abutment and epoxy resin abutment

Material and methodology- Abutment level impressions were made and dies were prepared (n=40). 20 dies were fabricated from epoxy resin die (Group 1) and 20 dies from Gypsum material (Group 2). The dies were digitally scanned and prosthesis was fabricated using DMLS technique. The prosthesis was cemented on the abutment using zinc phosphate cement and were evaluated for marginal inaccuracy on four surfaces (Buccal, lingual,mesial, distal) under 40x magnification of stereomicroscope. The results were analyzed statistically by t test.

Observation and result- The copings fabricated from Epoxy die resin have the higher marginal accuracy on all four surfaces with the mean of 0.19996 mm as compared to marginal accuracy of Die stone with mean of 0.2432mm. (p<0.05)

Conclusion- Marginal Accuracy of prosthesis fabricated on epoxy resin dies was significantly better than prosthesis fabricated on gypsum dies