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Abutment screw loosening in angulation-correcting implants: An in vitro study
Elena Hotinski1, James Dudley2
1Postgraduate Prosthodontics Registrar, Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia.
The Journal of Prosthetic Dentistry
|July 15, 2018
Summary
Angulation-correcting dental implants show improved resistance to abutment screw loosening compared to straight implants under simulated occlusal loading. This finding suggests angulation correction may enhance the long-term stability of implant-supported restorations.
Area of Science:
- Dental Implantology
- Biomaterials Science
- Biomechanics
Background:
- Techniques for angulation correction in screw-retained implant restorations are available.
- The impact of integrated angulation correction on abutment screw loosening remains unclear.
Purpose of the Study:
- To evaluate abutment screw loosening in angulation-correcting versus straight dental implants.
- To assess screw stability under simulated nonaxial occlusal loading conditions.
Main Methods:
- Seven 12-degree angulation-correcting and seven straight external connection implants were tested.
- Abutments were secured with screws, subjected to 1,000,000 cycles of 50-N nonaxial load.
- Abutment screw removal torque was analyzed to determine loosening.
Main Results:
- Mean abutment screw torque loss was 59.8% for angulation-correcting implants and 68.7% for straight implants.
- Angulation-correcting implants demonstrated significantly higher mean removal torque after 1,000,000 cycles (P=.019).
Conclusions:
- Both implant types experienced significant abutment screw torque loss with increased occlusal loading cycles.
- Angulation-correcting implants exhibited superior resistance to screw loosening compared to straight implants.
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