Graphical Programming Approach for Controlling Advanced Dental Chewing Simulation Machines

Objectives: A special chewing machine is being developed to simulate the mechanical and biological behavior of a human mouth. In previous generations, the chewing machines were limited to only mechanical loading. The new model, BIO-ART, is equipped with a biofilm reactor, simultaneously exposing the tooth sample to both mechanical and biological challenges. To control and to record data from this machine, a graphical programming approach was used with a user-friendly interface to perform the test.
Methods: First, a subVI was created using LabVIEW to calibrate a pH-temperature probe. The probe monitors the environment of the biofilm reactor. In order to create a favorable environment for bacteria growing inside the biofilm reactor, a separate subVI was programmed to read the temperature to activate or deactivate a heating element. This feedback loop allows users to select a desired temperature for the biofilm reactor. BIO-ART is also equipped with a timed-sucrose delivery system to feed the bacteria, simulating the meals during the day. Finally, two additional subVIs were designed for the motion control of the chewing component as well as a subVI to record the force applied by the chewing machine.
Results: After testing the reliability of each subVI separately, the files were compiled into one LabVIEW folder. This allows the computer to run all the subVIs simultaneously. Using LabVIEW alone, BIO-ART is capable of measuring and recording temperature, pH and force. In addition, it controls the temperature, the two servo-motors needed to simulate the chewing motion, and the timed-sucrose feeding component.
Conclusions: This report demonstrates how a graphical programming approach may be used to control the various components of the latest chewing machine. Once all initial testing and calibration are complete, it will provide researchers with a more dynamic and clinically representative environment for accelerating the testing of restorative dental materials.