2596705887

2596705887 - The Evolution of Toothbrush Short history Civilization which likes very much to delight itself with pleasant but not at all useful

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The Evolution of Toothbrush Short history: Civilization which likes very much to delight itself with pleasant but not at all useful delicacies, would have continuously suffered from caries if it had not understood in the earliest days of our history that one could avoid many troubles by brushing teeth after meals. But how should we brush them? For instance, one can chew some fibred rough plant. It would be even better to use a stick with the end macerated to fibers. Such a stick will clean not only the chewing surfaces, but also the front and inner ones. The Chinese perfected that simple device: they were just the people who invented the first tooth brush - a bunch of bristles on a bony or bamboo handle. Bristles were attached perpendicular to the handle so that it was more convenient to use it, and the technology of fixing bristles in the longitudinal slit of the handle was quite simple and reliable. The invention of plastic allowed the shape of the handle and the head, as well as the arrangement of bristles to be changed at one's desire. In the fifties, unsanitary bristle was replaced with nylon. At that point, the staged-gradual evolution of the toothbrush stopped and it started evolving in many directions at the same time. Each element of the brush tends to perform its functions ideally. For this purpose methods aimed at perfecting different elements are used and a combination of several new ideas produces a startling effect! Structure of a tooth brush: The bristle interacts with teeth and removes dental deposits and remnants of food from between the teeth. Bristle consists of several rows of bunches and bunches are composed of bristles, normally nylon ones. The head transmits to the bristle the force applied by the user to the handle, and serves as a base for attaching the bristle. This is a rigid flat element, normally made of plastic. The handle allows holding the tooth brush and transmitting the force to the head. The handle is normally an oblong plastic element of a considerable length. The tooth brush functions and problems that arise while using the tooth brush The main function: The tooth brush removes deposits from teeth. This function is performed with high quality and effectiveness, but it would be better if the use of the tooth brush also prevents dental diseases. Contradictions occur in the way of efficiency and quality: 1. Teeth have uneven surface, but it is necessary to provide high-quality cleaning of both protrusions and hollows. 1
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2. Food remnants must be removed from the slits between the teeth, but the slits are difficult-to-reach places. 3. It is not easy to reach the internal surfaces of teeth, but this should be done for providing efficient cleaning. Accompanying functions:
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This note was uploaded on 04/06/2010 for the course ME ME2004 taught by Professor Dr.yuen during the Spring '10 term at NYU Poly.

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2596705887 - The Evolution of Toothbrush Short history Civilization which likes very much to delight itself with pleasant but not at all useful

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