Glass-fibre-reinforced-composite fixed partial dentures on dental implants

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Prosthodontics

Background:

• Dental implant-supported reconstructions often utilize metal frameworks.
• Novel materials like fiber-reinforced composites offer potential alternatives.
• Investigating their mechanical properties and fit is crucial for clinical application.

Purpose of the Study:

• To evaluate the fracture strength and marginal fit of fiber-reinforced composite implant suprastructures.
• To compare cementation versus screw-retention fixation methods.
• To assess the durability of these materials after simulated long-term use.

Main Methods:

• Fabrication of 4-unit bridges using Vectris/Targis fiber-reinforced composite.
• Two fixation groups: adhesive cementation and screw-retention onto titanium abutments.
• Simulated 5-year thermal cycling and mechanical loading (TCML) followed by fracture testing.
• Scanning Electron Microscopy (SEM) for marginal fit analysis.

Main Results:

• Both cemented and screw-fixed bridges exhibited substantial fracture strength.
• Marginal adaptation was comparable between cemented and screw-fixed groups.
• Significant deterioration of the bond between Targis facing-material and composite cement was observed post-TCML.

Conclusions:

• Glass-fiber-reinforced composite suprastructures are a viable alternative to metal-framework reconstructions.
• Both screw and cement fixation methods are feasible for implant-supported composite bridges.
• Long-term material integrity, particularly adhesive bonds, requires further consideration.