アブストラクト(16巻3号:神奈川歯学)

神奈川歯学

Japanese

Title : レーザー照射とう蝕抑制(II) - 特に低エネルギーレベルに於けるエナメル質の状態変化 -
Subtitle : 原著
Authors : 鈴木幸江, 冨田房子, 嶋野浪江, 三田昭太郎, 小野塚実*, 岩田太一*, 菅谷英一*
Authors(kana) :
Organization : 日本女子衛生短期大学歯科衛生学教室, *神奈川歯科大学生理学教室
Journal : 神奈川歯学
Volume : 16
Number : 3
Page : 374-386
Year/Month : 1981 / 12
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 Sognnaes and Sternは1964年抜去歯牙にルビーレーザーを照射した際に, 照射部位のエナメル質表面および表層下エナメル質に著しい耐酸性 の増大が認められることを発見した. その後Stern et al.はエネルギー密度の低いCO2レーザーの方がルビーレーザーよりもエナメル質表面の滑沢化および耐酸性をより増大させることを, またYamamoto et al.はQスイッチおよび超音波Qスイッチを装着しパルス幅を小さくしたいわゆる連続発振に近いタイプのYAGレーザーを照射したエナメル質にも顕著な耐酸性の増大を産生することを, さらにOnozuka et al.は0.5-1.0ジュール程度の非常に低エネルギーでルビーレーザー照射したエナメル質にも十分耐酸性が増大することを報告している. ところでこのような各種レーザーの予防歯科領域への応用過程において, レーザー照射による耐酸性増大の機構に関する研究も進められている.
Practice : 歯科学
Keywords :

English

Title : Laser Exposure and Carious Prevention (II) - State changes of dental enamel induced by laser exposure at low energy density -
Subtitle :
Authors : Yukie SUZUKI, Fusako TOMITA, Namie SHIMANO, Shotaro MITA, Minoru ONOZUKA*, Taichi IWATA*, Eiichi SUGAYA*
Authors(kana) :
Organization : Department of Dental Hygiene, Nippon Women's College of Hygiene, *Department of Physiology, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 16
Number : 3
Page : 374-386
Year/Month : 1981 / 12
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : The present investigation was carried out to study crystallographic and chemical changes in human dental enamel exposed by a laser beam with low energy. A Rb laser and a CO2 laser were used. The disk preparation of powderd enamel made of a human tooth with intact enamel was irradiated by the laser at an energy density of 0.5-1.0 joules. By X-ray diffraction, computer controlled electron probe X-ray microanalysis and atomic absorption spectrophotometry, the follwing results were obtained : 1) The X-ray diffraction pattern of the lased enamel disk was almost the same as that of the unlased one, but the X-ray diffraction peaks of the lased enamel shifted slightly to a higher angle than those of the unlased enamel. 2) In the analysis by computer controlled EPXMA, the peak of CaLα of the lased enamel shifted to a shorter wave length than that of the unlased enamel. 3) In these results, the changed rate of the CO2 lased sample was higher than that of Rb lased sample. 4) The calcium-atomized state pattern of lased enamel was the same as that of the mixture of calcium oxide and calcium phosphate. The above findings suggest that a chemical change such as change of binding state of hydroxyapatite in enamel is induced by laser exposure, and this plays an important role in increased resistance to acid.
Practice : Dentistry
Keywords :