The robustness and reliability of two nondestructive evaluation methods to assess dental prostheses stability is
presented. The study aims at addressing an increasing need in the biomedical area where robust, reliable, and noninvasive
methods to assess the bone-interface of dental and orthopedic implants are increasingly demanded for
clinical diagnosis and direct prognosis.
The methods are based on the electromechanical impedance method and on the propagation of solitary waves.
Nobel Biocare® 4.3 x 13 mm implants were entrenched inside bovine rib bones that were immersed inside Normal
Saline for 24 hours before test in order to avoid dehydration and simulating physiologic osmolarity of the
corticocancellous bone and plasma. Afterwards the bones were immersed in a solution of nitric acid to allow
material degradation, inversely simulating a bone-healing process. This process was monitored by bonding a
Piezoceramic Transducer (PZT) to the abutment and measuring the electrical admittance of the PZT over time. On
the other hand the bones calcium loss was calculated after immersing in acid by Atomic Absorption Spectroscopy
over time for comparison. Moreover a novel transducer based on the generation and detection of highly nonlinear
solitary waves was used to assess the stiffness of the abutment-implant bone.
In these experiments it was found that the PZT's conductance and some of the solitary waves parameters are
sensitive to the degradation of the bones and was correlated to the bone calcium loss over time.