A new numerical approach for evaluation of dental implant stability using electromagnetic impulse

Bin Deng, BDS, PhD, (a,b) Keson B. C. Tan, BDS, MSD, (b) Gui-Rong Liu, (a,c) Jian-Ping Geng, BDS, MSD, PhD, (d) and Wei-Qi Yan, MD, PhD(d)

(a)Centre for Advanced Computations in Engineering Science (ACES), Department of Mechanical Engineering, and (b)Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, and (c)The Singapore-MIT Alliance (SMA), Singapore
(d)Clinical Research Center, The Second Affiliated Hospital, Zhejiang University, Hangzhou, P. R. China

Purpose: The aim of this study is to develop and evaluate computationally in detail a new non-contact method to access noninvasively the dental implant stability under various osseointegration stages and surrounding bone qualities.
Materials and Methods: The finite element analysis is performed with two steps: electromagnetic field analysis to obtain the electromagnetic forces and resonance frequency analysis subjected to the electromagnetic force. Osseointegration process is simulated by changing the Young’s modulus and Poisson’s ratio of the implant-bone interfacial tissue. Four types of surrounding bone quality are modelled by changing the geometry configuration and bone density.
Results: It is found that a significant increase in resonance frequency is related to the increase in Young’s modulus (p<0.0001). Varying the Poisson’s ratio has no statistically significant influence on the resonance frequencies (p>0.99). The bone quality has a significant effect on the resonance frequencies, with lower value in softer bone (p<0.0001).Conclusion: The results suggest that t h e use of resonance frequency analysis by an e lectromagnetic pulse is sensitive and hence effective to determine the implant stability during osseointegration process and under various surrounding bone conditions. (Int Chin J Dent 2008; 8: 1-9.)

Key Words: bone, electromagnetic i mpulse, finite element analysis , osseointegration, resonance frequency.