According to the principle of the magnetostriction generating mechanism, thecontrol model of giant magnetostriction material based on magnetic field and the control method withmagnetic flux density are developed. Furt...According to the principle of the magnetostriction generating mechanism, thecontrol model of giant magnetostriction material based on magnetic field and the control method withmagnetic flux density are developed. Furthermore, this control method is used to develop a giantmagnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whosecontrol variables are current intensity and magnetic flux density are compared with each other byexperimental studies. Finally, effective methods on improving the linearity and control precision ofmicro-displacement actuator and reducing the hysteresis based on the controlling magnetic fluxdensity are obtained.展开更多
Objective: combined with the clinical treatment problems of patients with orthodontic treatment, a new type of micro-implant anchorage was used in the treatment, and the application effect was analyzed. Methods: accor...Objective: combined with the clinical treatment problems of patients with orthodontic treatment, a new type of micro-implant anchorage was used in the treatment, and the application effect was analyzed. Methods: according to the requirements, suitable patients in our hospital were selected. There were 80 patients who met the standards. They received conventional treatment and micro-implant anchorage treatment respectively. The orthodontic status of the patients and the adverse reactions caused by the patient's body during the treatment in the hospital were studied. According to the clinical orthodontic indicators of the patients, the data of the two groups were compared in various aspects. Results: the orthodontic correction of the patients in the observation group achieved the expected effect after treatment. There were 39 cases without any problems, accounting for 97.50% of the population in this group, which was significantly higher than 80.00% in the control group. After effective treatment, 1 case had adverse reactions, accounting for 2.50% of the population in this group, which was not significantly less than 15.00% in the control group, and the difference was significant. After treatment, the molar displacement distance of the observation group was (3.31±0.32) mm, which was significantly smaller than that of the control group ( 5.21 ± 0.53 ) mm. ( 2.51±0.72 ) mm, the difference of incisor inclination in the observation group after treatment was ( 27.51±6.62 ) degrees, significantly larger than that in the control group ( 15.16±4.53 ) degrees, and the difference was significant (p<0.05). Conclusion: the use of micro-implant anchorage in clinical treatment of patients with orthodontic treatment has obvious advantages, which can help improve the oral deformity of patients, allow patients to have better treatment effects, and reduce the probability of adverse reactions, which is worthy of promotion.展开更多
基金National Natural Science Foundation of China(No.50275021)Doctoral Foundation of Education Ministry(No.2000014109)
文摘According to the principle of the magnetostriction generating mechanism, thecontrol model of giant magnetostriction material based on magnetic field and the control method withmagnetic flux density are developed. Furthermore, this control method is used to develop a giantmagnetostrictive micro-displacement actuator (GMA) and its driving system. Two control methods whosecontrol variables are current intensity and magnetic flux density are compared with each other byexperimental studies. Finally, effective methods on improving the linearity and control precision ofmicro-displacement actuator and reducing the hysteresis based on the controlling magnetic fluxdensity are obtained.
文摘Objective: combined with the clinical treatment problems of patients with orthodontic treatment, a new type of micro-implant anchorage was used in the treatment, and the application effect was analyzed. Methods: according to the requirements, suitable patients in our hospital were selected. There were 80 patients who met the standards. They received conventional treatment and micro-implant anchorage treatment respectively. The orthodontic status of the patients and the adverse reactions caused by the patient's body during the treatment in the hospital were studied. According to the clinical orthodontic indicators of the patients, the data of the two groups were compared in various aspects. Results: the orthodontic correction of the patients in the observation group achieved the expected effect after treatment. There were 39 cases without any problems, accounting for 97.50% of the population in this group, which was significantly higher than 80.00% in the control group. After effective treatment, 1 case had adverse reactions, accounting for 2.50% of the population in this group, which was not significantly less than 15.00% in the control group, and the difference was significant. After treatment, the molar displacement distance of the observation group was (3.31±0.32) mm, which was significantly smaller than that of the control group ( 5.21 ± 0.53 ) mm. ( 2.51±0.72 ) mm, the difference of incisor inclination in the observation group after treatment was ( 27.51±6.62 ) degrees, significantly larger than that in the control group ( 15.16±4.53 ) degrees, and the difference was significant (p<0.05). Conclusion: the use of micro-implant anchorage in clinical treatment of patients with orthodontic treatment has obvious advantages, which can help improve the oral deformity of patients, allow patients to have better treatment effects, and reduce the probability of adverse reactions, which is worthy of promotion.
