How does cement choice affect screw stability in implant-supported restorations with different abutment angulations?...

Area of Science:

• Dental Implantology
• Biomaterials Science
• Prosthodontics

Background:

• Abutment-screw stability is crucial for the longevity of single implant-supported restorations.
• Different cement types and abutment angulations may influence this stability.

Purpose of the Study:

• To evaluate the effect of cement type on the abutment-screw stability of implant restorations.
• To assess the influence of varying abutment angulations on screw stability.

Main Methods:

• Fifty CAD/CAM monolithic zirconia crowns were divided into screwed and cemented groups.
• Cemented groups utilized temporary or definitive cements with straight or angulated abutments.
• Dynamic loading with thermocycling was performed, followed by reverse torque testing.

Main Results:

• Definitive cementation, particularly with angulated abutments, showed higher torque retention.
• Significant differences in stability were observed between screwed and most cemented groups.
• No significant difference in stability was found between straight and angulated abutments within cemented groups.

Conclusions:

• Definitive cementation enhances screw stability in implant restorations, especially for angulated abutments.
• The choice of cement and retention method significantly impacts the long-term mechanical performance of implant restorations.
• Findings suggest definitive cementation as a potentially more stable option for implant restorations.