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Reliability and failure behavior of CAD-on fixed partial dentures
G R Basso1, R R Moraes1, M Borba2
1School of Dentistry, Federal University of Pelotas, Rua Gonçalves Chaves 457, CEP 96015-560, Pelotas, RS, Brazil.
Summary
This study assessed the reliability of CAD-on fixed partial dentures (FPDs). Testing methods significantly impacted FPD reliability but not failure modes, indicating crucial considerations for material selection and design.
Area of Science:
- Biomaterials Science
- Dental Materials
- Mechanical Engineering
Background:
- The CAD-on technique offers a method for fabricating fixed partial dentures (FPDs).
- Understanding the reliability and failure mechanisms of these restorations is crucial for clinical success.
Purpose of the Study:
- To estimate the reliability and failure behavior of FPDs fabricated using the CAD-on technique.
- To compare failure modes under different testing conditions (fast fracture vs. fatigue).
Main Methods:
- Twenty-five three-unit FPDs were fabricated using CAD/CAM with IPS e.max materials.
- Mechanical fatigue testing was performed using cyclic loading, with data analyzed via Weibull cumulative damage models.
- Failure modes were examined using field emission scanning electron microscopy.
Main Results:
- Porcelain chipping was the primary failure mode in fast fracture tests (60%), while connector failure dominated fatigue tests (67%).
- Weibull modulus (β) values were higher for fast fracture data (7.8 combined, 7.9 for chipping, 2.9 for connector fracture).
- Fatigue testing yielded lower β values (1.6 for connector fracture, 1.3 for chipping) compared to fast fracture estimates.
Conclusions:
- The testing methodology (fast fracture or fatigue) significantly influenced the estimated reliability of CAD-on FPDs.
- However, the testing method did not alter the fundamental failure behavior observed in these FPDs.
- These findings highlight the importance of considering test conditions when evaluating the durability of CAD-on FPDs.
