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Cement-cement interface strength: influence of time to apposition
1The J. Vernon Luck Sr. M.D. Orthopaedic Research Center at Orthopaedic Hospital, 2400 South Flower Street, Los Angeles, California 90007.
Journal of Biomedical Materials Research
|December 18, 2001
Summary
Delaying cement-to-cement apposition significantly weakens the interface bond. For optimal bond strength, join cement surfaces within 5 minutes and 45 seconds of mixing to ensure a strong cement interface.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Materials Engineering
Background:
- Cement-cement interfaces are crucial in orthopedic procedures.
- Understanding factors affecting interface strength is vital for clinical success.
Purpose of the Study:
- To investigate the impact of time to apposition on cement-cement interface strength.
- To determine the optimal time window for joining cement surfaces.
Main Methods:
- Simulated operating-room conditions were used to create cement-cement interfaces.
- Interface strength was assessed using a three-point bending test.
- Scanning electron microscopy (SEM) analyzed failed interfaces.
Main Results:
- Interface strength decreased significantly with increasing delay time.
- An 8% decrease was observed after a 1-min delay, rising to 42% after a 6-min delay.
- SEM revealed up to 50% unbonded surface area after a 6-min delay.
Conclusions:
- Time to apposition is a critical factor in cement-cement interface strength.
- Joining cement surfaces within 5 minutes and 45 seconds is recommended.
- Delays beyond this timeframe can substantially reduce bond strength.