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Design Optimization of Reduced-Diameter Implants by Artificial Neural Network

Jason Griggs, PhD – Associate Dean for Research, University of Mississippi School of Dentistry

Abstract:

Purpose of the Study: The objective was to train an artificial neural network (ANN) to predict the fatigue limits of dental implants.

Methods: Four commercially available reduced-diameter implant systems (RDIS) were investigated: Straumann Narrow Neck, Biomet 3i Osseotite MicroMiniplant, Nobel Biocare NobelReplace, and Biomet 3i Osseotite Certain. Step-stress accelerated lifetime testing was performed on the RDIS to determine the fatigue limit for each design. MicroCT images (Skyscan1172, Microphotonics) of the four RDIS were analyzed. Twenty-four design parameters were identified, and measurements were made using Mimics interactive image processing software (Materialise, 9-micron resolution). Linear stepwise regression was used to identify the seven most significant design parameters, and these were used as the input vector to predict the fatigue limit in a feedforward error-backpropagation ANN having one hidden node. The learning ratio was decreased from 1 to 0 over 1,500 iterations.

Results: The ANN achieved a notable prediction accuracy (R-squared=0.99995). The effects of implant body inner diameter, abutment screw thread height, and abutment screw head diameter were non-linear and could account for most of the variation in fatigue limit between implant systems.

Conclusion: The ANN was successfully trained on the commercially available implant systems and may be a useful tool in predicting the implant design that corresponds to maximum possible fatigue limit. However, some of the design parameters are confounded in the current commercially available systems, so future studies should train an ANN on the fatigue lifetime predictions from finite element models of hypothetical implant systems in which the factors are not confounded.

Articles: None cited.


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