Citation: Emil LA Svoboda PHD, DDS. Anit Sharma DDS, Majid Zakari DDS

Abstract: Intra-oral cementation is a common process for attaching crowns and bridges to natural teeth and dental implants. While fixed-prosthetics are cemented onto natural teeth, dental implants may also be restored by a screw-in technique. It is unfortunate that this latter installation system has inherent problems that renders patients susceptible to complications and related peri-implant disease. Treatment for this disease can be uncomfortable, unpredictable, and expensive.
Intra-oral cementation can reduce or eliminate several problems related to the screw-in technique but has been plagued by complications related to poor prosthesis margins and residual subgingival cement. While removal of excess cement can often result in the resolution of related peri-implant disease, an intra-oral cementation system that prevented it could be key to reducing complications.

This research compared the installation of the common Chamfer Margin (CM) abutment-crown complex to a more recent installation system utilizing a Reverse Margin (RM) design. Both systems were tested in vitro, with their margins positioned at ½ and 1 mm subgingival, while their complementary crowns were pushed into place under varying pressure conditions. The RM System consistently outperformed the CM System and may thus be a preferable choice for intra-oral cementation of implant prosthetics. Also, shallower margins and lower pressure installation helped both margin systems perform better.

*Correspondence: [email protected] . Dr Svoboda is in private practice placing and restoring dental implants. He invented the Reverse Margin System and holds patents on the design aspects of both the crown and abutment. Related publications are available at Cite this article as: Svoboda ELA, Sharma A, Zakari M. Comparing the Chamfer and Reverse Margin Systems at Preventing Submarginal Cement while varying Crown Installation Pressure and Margin Depth. 2020;1-13.

Comparing the Chamfer and Reverse Margin System at Preventing Submarginal Cement