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Finite element modeling of an intact and cracked mandibular second molar under quantitative percussion diagnostics
Jie Shen1, Nasrin Taheri-Nassaj2, Cherilyn G Sheets3
1PhD Candidate, Department of Materials Science and Engineering, University of California, Irvine, Irvine, Calif.
The Journal of Prosthetic Dentistry
|September 27, 2024
Summary
Quantitative percussion diagnostics (QPD) can identify cracked teeth by analyzing vibrations. This study used finite element analysis to simulate QPD, revealing that crack surface oscillation causes distinct multipeak responses in damaged teeth.
Area of Science:
- Biomechanical Engineering
- Dental Diagnostics
- Computational Modeling
Background:
- Quantitative percussion diagnostics (QPD) is used for non-destructive evaluation of teeth and bone integrity.
- The underlying mechanism of QPD in detecting dental issues like cracks is not fully understood.
Purpose of the Study:
- To elucidate the dynamic behavior of human teeth during QPD procedures.
- To develop and validate physiologically accurate 3D finite element models of mandibular molars for QPD simulation.
Main Methods:
- Finite element analysis (FEA) was employed to model intact and vertically cracked mandibular second molars.
- Models included enamel, dentin, periodontal ligament, bone, and the QPD handpiece percussion rod.
- FEA models were validated against clinical QPD data from an extracted cracked tooth.
Main Results:
- FEA simulations accurately replicated clinical QPD data, validating the model.
- Simulations showed that oscillation between crack surfaces generates secondary peaks in the QPD energy return signal.
- These secondary peaks differentiate cracked teeth from intact teeth in QPD analysis.
Conclusions:
- FEA modeling successfully simulates clinical QPD results for intact and cracked teeth.
- The study provides insight into how QPD detects cracks, attributing multipeak responses to crack surface oscillation.
- This validated model can aid in understanding and improving QPD for dental diagnostics.
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