Studies on Marginal Leakage of Cavities Prepared by Er : YAG Laser

Er:YAG激光器制备腔体边缘泄漏的研究

• 批准号: 09671977
• 负责人: TAMURA Naoharu
• 金额: $ 1.47万
• 依托单位: Fukuoka Dental College
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09671977/
• 关键词: Er : YAG Laser; Marginal Leakage; Mercox-Rhodamin Method; Tunnel Cavity; Composite Resin; Er:YAGレーザー; メルコックス・ロ-ダミン法

Two kinds of Composite resin, LI that were seen micro-marginal leakage in class V cavities and MZ that were not recognized micro-marginal leakage, were filled. After 200 thermal scycles, Marginal leakage was tested by Mercox-Rohdamin Method.Test 1 : (1)The class V cavities were prepared only by Er : YAG Laser without rotar cutting instrumens in molar.(2)Only bevel were prepared by Er : YAG laser.(3)Er : YAG laser were irradiated at the floor cavity and the side wall. These thre kinds of cavities were filled with composite resin with or without etching method.Test 2 : The tunnel cavities were prepared in premolar for proximal caries. (1)Th tunnel cavities were prepared by rotaly cutting instrument. (2)Soft dentin was removet by Er : YAG laser, and cavities were finished. These two kinds of cavities were done th ame way as in Test 1.Results were as follows.1. It is difficult to prepare cavity by Er : YAG laser without rotary cutting instrument Er : YAC laser is useful for removing soft dentin.2. The method using laser etching is unstable. It is necessary to change etching tim and etching method, and to develop bonding agents. Using Laser in tunnel cavit incresed micro-marginal leakage.3. unnel cavities filled with MZ are often observed micro-marginal leakage at th proximal enamel cervical wall.

填充两种复合树脂：LI（在V类腔体中观察到微边缘泄漏）和MZ（未识别出微边缘泄漏）。 200次热循环后，采用Mercox-Rohdamin法测试边缘泄漏。 测试1：（1）仅使用Er：YAG激光制备V级腔体，磨牙中没有旋转切割工具。（2）仅使用Er：YAG激光制备斜角。（3）Er：YAG激光照射在底腔和侧壁上。这三种蛀牙均采用复合树脂填充，采用蚀刻法或不采用蚀刻法。 试验2：在前磨牙中制备近端龋的隧道洞。 (1)采用旋转切割工具制备隧道空腔。 (2)采用Er:YAG激光去除软质牙本质，完成蛀牙。这两种型腔的制作方法同试验1。结果如下： 1．在没有旋转切割仪器的情况下，用Er:YAG激光制备空腔是很困难的。Er:YAC激光对于去除软牙本质很有用。2．使用激光蚀刻的方法不稳定。需要改变蚀刻时间和蚀刻方法，并开发结合剂。在隧道腔内使用激光增加了微边缘泄漏。3．充满 MZ 的隧道腔经常在近端牙釉质宫颈壁处观察到微边缘渗漏。