Fracture Strength of Conometric Joint Implants Vs. Internal Hexagon Abutment Joint Design: An In Vitro Study.

Objectives: The dental implant is an effective long-term rehabilitation procedure for oral edentulism and supports functional masticatory loading forces. The implant prosthetic joint is considered a key factor for interface stability due to its related biological and biomechanical implications-the present investigation aimed to evaluate the fracture strength of two different implant prosthetic joints.

Material and methods: This investigation tested 10 implants for each group: econometric implant joint (Group I) and internal hexagon implant (Group II). The implant abutment joint was coupled using a calibrated torque meter. The samples were assessed using a loading fracture test and radiographically evaluated to investigate the interface changes and deformations.

Results: The means and standard deviations of the group I and group II maximum force (N) were 553±51N and 432±43N. The Young elastic modulus of group I and group II implants were 183.97±11.71 GPa and 143.72±15.93 GPa.

Conclusions: The conometric joint was reported to have a higher strength than the regular internal hexagon implant connection. The study findings could have clinical implications for implant durability and peri-implant tissue stability in favor of the conical joint design.