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Keywords

Retention

،
؛Overdenture
؛Coping
؛DMLS
؛CAD/CAM

Abstract

Aims: To compare the retention of copings produced by Direct Metal Laser Sintering (DMLS), Hard metal CAM (Computer Assisted Milling) and conventional casting techniques. Materials and Methods: An implant abutment was used as an ideal model which was scanned by 3D scanner and 8 copings of each group were fabricated from a single STL file. Each specimen was seated, luted, and mounted on a vertical column universal testing machine for a pull-off test. Dislodgement readings were recorded and statistically analyzed with ANOVA test and Duncan’s multiple range test. Results: Significant difference was found between the studied groups in retention. The laser-sintered group showed the highest force required for dislodgement followed by conventional casting group then by the hard metal milling group. Conclusions: within the limitations of this study, Laser sintered group has the superior retention above the other two groups
https://doi.org/10.33899/rdenj.2021.130871.1120
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