| 1.
図書 |
図書
|
山田好秋研究代表
|
||||||
| 2.
図書 |
図書
|
山田好秋著
|
||||||
| 3.
図書 |
図書
|
山田好秋
|
||||||
| 4.
論文(リポジトリ) |
論文(リポジトリ)
|
山田, 好秋 ; 五十嵐, 敦子 ; 野村, 修一
概要:
We as the committee members in Dental School have been concerned to develop a new curriculum for social demands. Recently, people involved in the care of the aged and the patient suffered from the cerebral disorder, are pointing out the
…
following matter: they desire to eat food through their mouth even it is risky and dentists are desired to join in the care. Thereafter, we have constructed a new curriculum with a series of lectures of whereby we can deal with their demands. We took survey from students, and got evaluations to the new trial after lectures. There found were more responses than expectations, in that young people are seeking something new and are sensitive to social problems. We thus inform of the content here.
続きを見る
|
||||||
| 5.
論文(リポジトリ) |
論文(リポジトリ)
|
山田, 好秋
|
||||||
| 6.
論文(リポジトリ) |
論文(リポジトリ)
|
山田, 好秋
|
||||||
| 7.
論文(リポジトリ) |
論文(リポジトリ)
|
平野, 秀利 ; 河野, 正司 ; 山田, 好秋 ; 杉本, 浩志
概要:
Vertical dimension must be examined to determine centric occlusion when treating patients whose occlusion has collapsed.
…
Up to now, we have been using calipers to measure mandibular position, but this method does not assure accurate measurements of andibular position. We have developed a small and light electronic measuring device which can measure mandibular position through magnetic sensors. This device consists of a magnet attached on the lower jaw, a pair of sensor units set on the sides of the nose tip which are kept 40mm apart from the magnet, and a sensor set on the forehead to avoid geomagnetism. Calibration for the output from the sensor unit was made, and the resulting output curve was approximated to a straight line. We also tested several factors that could cause measurement error such as temperature sensitivity of the sensor, temperature sebsitivity and drift of the circuit, improvement of linearity of the sensor output, and the influence of head unrest and geomagnetism. When these factors were cleared, we proceeded to try it clinically. As a result, it was possible to measure mandibular position within a range of 30mm-50mm with an error margin of 3-5%. For centric occlusion and rest position, it became clear that we could measure mandibular position precisely by fixing the magnet onto the gingiva of the lower anterior incisor teeth.<br />咬合が崩壊した患者を治療するには、咬頭嵌合位を設定するにあたって、咬合高径を記録、診断することが不可欠である｡この測定には、従来ノギスを用いた方法によっているが、経時的に正確な測定を行うことは困難であった｡本研究では、磁気センサーを応用することにより、下顎位を二次元で経時的に測定することが可能な、小型軽量な電気的測定装置を開発し、装置の特性、および臨床的操作に際して生じる誤差要因を検討した。装置は、下顎に磁石を設置し、これより40mm離して鼻部に2個のセンサーユニットを、前頭部に補正用のセンサーを設置した。センサーユニットからの出力をキャリブレーションし、得られた出力曲線を直線近似式で補正した｡また、① センサーの温度特性、② 回路の温度特性およびドリフト、③ センサー出力の直線性の改善、⑥頭部動揺および地磁気の影響、の4項目に対しても補正を加え、センサーと磁石の間隔が30m～50mmの範囲で、3～5％内の誤差で直線性を保って測定可能となった｡健常者に対する測定では、磁石を下顎前歯歯頚部粘膜に固定することにより、咬頭嵌合位、安静位における顎間関係を、臨床に必要な精度で測定できることが明らかとなった｡
続きを見る
|
||||||
| 8.
論文(リポジトリ) |
論文(リポジトリ)
|
山田, 好秋 ; 山村, 健介
|
||||||
| 9.
論文(リポジトリ) |
論文(リポジトリ)
|
牛膓, 哲也 ; 木竜, 徹 ; 山田, 好秋 ; 齊藤, 義明
|
||||||
| 10.
論文(リポジトリ) |
論文(リポジトリ)
|
林, 豊彦 ; 田中, 澄江 ; 池津, 正人 ; 中嶋, 新一 ; 小林, 博 ; 山田, 好秋 ; 宮川, 道夫 ; 石岡, 靖
概要:
In order to clarify the control mechanism of jaw movements, we developed an autonomous jawmovement simulator, JSN/1 D, w
…
hich incorporates cable-tendon DC-servo actuators, simulating the masseter, temporalis, lateral pterygoid, and digastric muscles. The actuators were controlled adaptively under an impedance-control mechanism, utilizing data for biteforce, tooth contact, cabletension, and cablelength. In order to achieve more lifelike open-close movement on the simulator, we introduced a control hypothesis that during closing, the horizontal mandibular position is determined by antagonistic activities of the posterior portion of the temporalis muscles and the lateral pterygoid muscles. This hypothesis was materialized by an impedance control for the posterior temporalis actuators and an antagonizing tension-control of the lateral pterygoid muscles. The actuators were activated in the following manner, so as not to contradict anatomical and physiological knowledge of the jaws. The masseter actuators were activated only during biting, in order to exert bite force. The anterior temporalis actuators under impedance control were solely responsible for determining the vertical position of the mandible during closing and supported the masseter actuator during biting. During opening, the digastric and lateral pterygoid actuators were co-activated to lower the mandible. Both actuators were driven under tension control, due to the lack of the muscle spindles in corresponding muscles. At rest, all the actuators functioned as a weak elastic body like actual muscles. Experimental results demonstrated that the aforementioned control scheme can produce a reproducible lifelike open-close movement on the simulator , while referential experiments with less activation of the α-γ linkage of the posterior temporalis control showed kinetic instability, particularly in the closing phase. All these suggest a possibility of stabilizing the mandible during closing through position control of the posterior temporalis muscles and antagonistic tension-control of the lateral pterygoid muscles. A single alternative to this control scheme is to employ an excessive co-activation of the two muscles to make the position of the mandibular head less compliant. This is hardly acceptable, however, because no such strong activities are observed in both muscles during closing. Physiological validation of the proposed control scheme is a task that should be dealt with in a subsequent study.
続きを見る
|
