Orthodontic Simulator for Three Dimensional Orthodontic Force Measurement

Research Project

Project/Area Number	07457505
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	矯正・小児・社会系歯学
Research Institution	Tokyo Medical and Dental University
Principal Investigator	MIYAIRI Hiroo The Medical and Dental University, Inst Med Dent Engng, Professor, 医用器材研究所, 教授 (50013892)
Co-Investigator(Kenkyū-buntansha)	FUKUDA Hideaki The Medical and Dental University, Inst Med Dent Engng, Assistant, 医用器材研究所, 助手 (50014163) NAGAI Masahiro The Medical and Dental University, Inst Med Dent Engng, Assistant, 医用器材研究所, 助手 (10013971) TAKAKUDA Kazuo The Medical and Dental University, Inst Med Dent Engng, Associate Professor, 医用器材研究所, 助教授 (70108223)
Project Period (FY)	1995 – 1997
Project Status	Completed (Fiscal Year 1997)
Budget Amount *help	¥5,900,000 (Direct Cost: ¥5,900,000) Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000) Fiscal Year 1996: ¥1,900,000 (Direct Cost: ¥1,900,000) Fiscal Year 1995: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywords	Orthodontics / Orthodontic Force / Tooth Movement / Experimental Model / Simulator
Research Abstract	To realize the orthodontic simulators, we built a instrumented tooth model. This model is for anterior teeth, constructed on a combined gonio and x stages. The rotational center of the gonio stage is adjust to the center of resistance of the teeth, and the translation direction of the x stage is adjusted as the anteroposterior direction. Thus the model can simulate the movement of the teeth under orthodontical treatment. The three dimensional force was measured by the load cell made by the brass cylinder with four strain gages. It can measure the anteroposterior force and saggital moment. Although the strain magnitude was not so large, the output linearity was excellent and the calibration testing guarantee the accuracy of the measuring system. Above these components, there settled the artificial resin teeth which enable us to make the realistic form to the simulator. The tooth arch was constructed using the four instrumented anterior teeth models and two other posterior tooth model. Then the orthodontic apparatus was settled on the simulator and the orthodontic force was measured. The apparatus were stainless steel wires of .018" or .016" square cross section. The wire were tied with ligature wire to the blankets adhered to the resin tooth. The retraction force was simulated by the weight loaded to the wires. The measured results were satisfactory and it was proved that the simulator constructed is useful to analyze the orthodontic force generated by the orthodontic apparatus.