Design and manufacturing of a dental testing rig for in vitro assessment of abrasivity and wear.
Objectives: To design a toothbrush simulator satisfying the following parameters: 1. That can simultaneously function as toothbrush simulator and oral wear simulator. 2. That provides maximum possible control over brushing variables including brushing angulation, speed and force. 3. Comprising of economical and easily replaceable parts. 4. That can be manufactured under 1/10th the price of existing toothbrush simulator. Methods: The design of the variable speed, six head toothbrush simulator is based on crankshaft design. This part is machined in a single piece to prevent friction, vibration and ensuring uniformity in brushing head tracks. A single motor crank shaft wheel and axil design ensures synchronous and uniform movement.. Initially load was controlled by Springs that kept on fluctuating. It was later replaced by direct attachment of loads on brush holder. Finally brushing of bovine teeth with reference toothpaste was simulated and effects were tested using SEM. Results: The design and construction of the indigenous tooth brush simulator was successfully completed with the following specifications: 1. Operational Weight range attained between 55grams and 800grams 2. Brush Head Angle range from 0 to 45 degrees 3. Speed ranges from 210 to 450 rpms SEM confirmed the reproducibility and precision of this device At a manufacturing cost of $300/- the price of this simulator is significantly less than commercially available options retailing at an average of $9,000/- Conclusions: 1. All the functional specs were achieved 2. The present design allows toothbrush simulator to be changed into wear simulator 3. All parts are economical and replaceable 4. The design can be upgraded with minimal costs