| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 96 === The primary purpose of this research work is to design new type of orthodontic anchorage screws. It is usually difficult to screw in the commercialized ones and hard to localized the anchorage screw without pre-drilling during orthodontic surgical operation. There are three types of anchorage screws which are A type with 3 cutting edges, B type with 3 flutes of self-tapping function, and combination both functions of C type were designed and manufactured in the CNC machine center once for all. All of the machined screws were tested with rigid polyurethane foam (base on ASTM F1839) and pig bones. The experimental results indicated that types A, B, and C did not meet the pursuit targets for design purposes. Therefore, a D type based on the advantages of both original type and C type was designed. The experimental data revealed that the maximum twist force was decreased from 0.181 to 0.092 kgf-cm. And the necessary anchoring revolutions for screw were also decreased from 5 to 1, simultaneously. Our conclusion is that it is not necessary to pre-drilling any more by take D type for orthodontic operation.
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