| Summary: | 博士 === 國立交通大學 === 應用藝術研究所 === 106 === Patients with periodontitis often have difficulty in maintaining oral hygiene with toothbrushes during treatment periods, especially for patients with severe conditions where brushing may cause bleeding of the gingiva and increase the chance of bacterial infection. Patients who are bedridden long-term due to chronic diseases, also experience similar inconveniences in being unable to maintain oral hygiene through brushing their teeth and must do so through other means. We explored the method for dental washer, using the O2micro-bubble generator connect the ejection nozzle to an ergonomically designed soft teeth-tray that fits with the tooth configuration of a typical human oral cavity to clean oral plaque bacteria and facultative anaerobe.
There are three experiments in this study, of which the first experiment used 5 rotation speed settings, the 5 hole-size of nozzles, and 1.6mm hole-size of soft teeth-tray making the combination of different conditions for the removal of dental experiments. The result showed that with various combinations of motor speed settings and pore diameters, a clearing rate of average 75% could be achieved. This confirmed the plaque removing function of the micro-bubble water streams, but the flow volume and velocity, and micro-bubble diameter had no significant (P>0.05) influence on cleaning efficiency. It is not the same with the hypothesis; the smaller micro-bubble is easier to remove the bacteria.
After changing the design variables, the second experiment is divided into two sub-experiments, the 2A and 2B. The 2A used five levels of rotor speed and three holes in 4 types of ejection-hole diameter, and 1.6mm hole-size of soft teeth-tray, make up 20 combinations to clean oral plaques bacteria. The results showed that with various combinations of motor speed settings and pore diameters, a clearing rate of average 79.55% could be achieved, while in some combinations a clearing rate of 91.64% was possible, The hole-size of nozzles had an influence on micro-bubble and cleaning efficiency, the smaller micro-bubble is better to remove the bacteria, but the rotor speed was not influencing on micro-bubble diameters and cleaning efficiency. The 2B used 5 rotation speed settings, the 5 hole-size of nozzles, and 4.8mm hole-size of soft teeth-tray making the combination of different conditions for the removal of dental experiments. The results showed that the rotation speed had influence flow volume. The higher motor speed, the greater the flow volume and the high flow volume could influence bacteria removing. The hole-size of nozzles had influence flow volume and micro-bubble diameters, and the flow volume and micro-bubble diameters could influence bacteria removing. The larger the flow volume, the smaller the size of microbubbles, the better the removal bacteria effect, and in some of the conditions for the removal achieves 99%.
The third experiment that we conducted simulations with a denture to investigate the efficacy of using this method to remove facultative anaerobes. The several variables were manipulated, including three rotation speeds of the bubble generator, three different nozzle diameters, and four different numbers of nozzle holes. The results revealed that the device is effective in removing facultative anaerobes; moreover, of all design variables, the number of nozzle holes and rotation speeds were the factor having the largest effect on anaerobe removal, as it influenced the flow volume and oxygen content of the discharge: the greater the number of nozzles, the greater the flow volume, oxygen content, and efficacy of anaerobe removal.
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