アブストラクト（27巻2号：神奈川歯学）

神奈川歯学

Japanese

Title　： 模型計測のための実験的研究 - 三次元座標測定機のプローブに関する検討 -
Subtitle　： 原著
Authors　： 井野智, 菊田大士, 田中欽也, 金圭一, 谷内慎一, 清水忠, 浮谷實
Authors（kana）　：
Organization　： 神奈川歯科大学補綴学教室第II講座
Journal　： 神奈川歯学
Volume　： 27
Number　： 2
Page　： 231-237
Year/Month　： 1992 / 9
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」三次元座標測定機による模型計測法は, 生体を間接的に計測する為の有効な手段として頻繁に用いられている. この装置は, 工業界での需要が高まるにつれて, プローブの種類も多様化が進み, 歯学研究への導入を試みる際, それぞれの特徴を生かした使い分けという新たな方向性が生じてきている. 特に測定精度の面では, 模型計測法の研究の目標とする精度に対応できるプローブを選択する事は重要である. しかし, その為の資料は乏しく, しかも, 一般に用いられる接触型プローブは, 手動で模型の計測部位に接触させて計測するもので, その結果, プローブ先端で模型を破損させる危険性がある. また, 接触圧は, 計測者の手指のコントロールに頼るため, 得られたデータの精度も不安定になりがちである. そこで今回, これらの不安事項を取り除き, 正確なデータを収集する事を目的として, 一般に用いられる接触型プローブに対し, 接触感知機構を付与した方法, 及び非接触型プローブを用いる方法を考案し, 各々について測定精度の面から検討を行った.
Practice　： 歯科学
Keywords　： 模型計測, 三次元座標測定機, プローブ, 測定精度

English

Title　： An Experimental Study on Measurement for Casts - An Evaluation on Probes of 3-Dimensional Coordinates Apparatus -
Subtitle　：
Authors　： Satoshi INO, Daishi KIKUTA, Kinya TANAKA, Keiichi KIM, Shinichi YANAI, Tadashi SHIMIZU, Makoto UKIYA
Authors（kana）　：
Organization　： Department of 2nd Prosthodontics, Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 27
Number　： 2
Page　： 231-237
Year/Month　： 1992 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： Abstract: It is very important to accurately restore the anatomical shapes in the stoma-tognathic system when prosthetic appliances are constructed. Therefore, the various studies were carried out in this area using different methods. Among them, measurement for plaster casts using a 3-Dimensional Coordinates Apparatus is an effective method. It should be also considered that an amount of pressures from the probe during measurements may often cause the damages of casts, and as a result, this reduces measuring values with accuracy. Therefore, the following evaluations were conducted in this study. 1. Related to the attachment of a contact sensor to the probe minimizing contact pressures. 2. Related to a method of 3-dimensional applications of a centering microscope without any contact pressure. A 3-Dimensional Coordinates Apparatus (XYZAX S-500, Tokyo Seimitsu Co.) was used to evaluate these two methods. Four subjects were selected at random to evaluate measurements by metal test pieces and repeated experiments were conducted regarding the accuracy. Additionally, a value of S/N ratio was applied to evaluate the sensibility and its variations. From these experiments, the following results were obtained. 1. An additional contact sensor was accurate and repeated values with accuracy in all the axes directions were within 2μm. 2. Using a centering microscope, repeated values with accuracy in X and Y axes directions were within 20μm, whereas Z axis direction was within 70μm. 3. In order to accurately measure the casts, an application of S/N ratio was proved to be of validity for this type of experiments. Consequently, results from this pilot study on probes attached to the apparatus should contribute to evaluate the various experiments using plaster casts.
Practice　： Dentistry
Keywords　：