Stress distribution in implant-supported conometric single crown restorations: A finite element analysis

Purpose

The aim of the present study was to evaluate the effect of connection, restorative material type, and loading forces on the stress distribution in implant-supported conometric single crown restorations using a three-dimensional finite element analysis method.

Methods

Restorations are produced using two different all-ceramic materials used in maxillary right premolar conometric abutments and caps (Conometeric abutment EV, Conometeric Final Cap, Dentsply Implants, Sweden) on implants with three different types of connection: morse taper connection (MTC) (Ankylos, Dentsply Implants, Sweden), conical connection (CC) (Astra-Tech OsseoSpeed EV, Dentsply Implants, Sweden), and internal flat connection (IFC) (Xive, Dentsply, Sweden). Three-dimensional finite element analysis was used to evaluate the amount and distribution of stress around implants under different vertical and oblique loading conditions.

Results

The maximum stress distribution in the implant abutment contact area in the IFC was 565.44 MPa and screw peak stress values were determined to be 518.96 MPa in the transition zone for MTC. MTC caused the lowest bone stress, although there was no significant difference between the connection systems in terms of material type. The LDS material exhibited the greatest stress on the conometric cap for IFC (447.52 MPa) under oblique loading conditions.

Conclusion

Stress on the bone surface and implant abutment contact was higher in the IFC group. IFC has a disadvantage in term of increases the possibility of bone destruction.