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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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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.

Dental Materials : Official Publication of the Academy of Dental Materials

|February 22, 2016

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.

Keywords:

Dental ceramics Fatigue Lithium disilicate Step stress Zirconia

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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.