Caries prevention and Restoration by Ceramics Coating on Enamel Surface Using a CO_2 Laser

CO_2激光在牙釉质表面陶瓷涂层的防龋与修复

• 批准号: 15592077
• 负责人: UMEMOTO Kozo
• 金额: $ 2.11万
• 依托单位: Kanagawa 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: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15592077/
• 关键词: Laser; Ceramics; Caries prevention; Surface treatment; Enamel; Acid resistance

To study new restoration and to improve the acid resistance of teeth, the enamel surface was coated with several ceramic materials by a carbon dioxide gas laser. The ceramic powder suspension were applied on the enamel surface treated with 37% phosphoric acid (K-etchant, Kuraray Co.), and then the enamel was irradiated by a pulsed CO_2 laser (Opelaser/03S, Yoshida Co.) at irradiation intensities of 1.0 watt for 30 seconds with a beam size of 0.49mm at the focal point. And all surface except for the circle of 3mm diameter on the irradiated enamel surface was painted with nail varnish. The painted enamel sample was immersed in 10 ml of 0.1M-acetic acid/sodium acetate buffer solution at pH 4.0 for 30 minutes. The calcium ions released in the buffer solution from the enamel were measured by flame analysis.The acid resistance of the enamel treated with the phosphate calcium glass (PGC) was extremely improved, that of the enamel treated with silica-zirconium oxide was slightly improved, and that treated with the porcelain for metal-ceramics was not improved. The increase of the acid resistance of the enamel treated with PGC may be due to good wetting of PGC melted by laser irradiation to the enamel surface, as the composition of PGC was analogous to hard tooth tissue that was calcium phosphate.It is well known that the enamel treated with fluoride anion followed by lanthanum cation showed good acid resistance. Therefore, the enamel etched with the phosphoric acid was treated with 1% sodium fluoride aqueous solution followed by 1% lanthanum chloride aqueous solution, and then was irradiated by the laser. However, the acid resistance of the irradiated enamel was not improved.

为了研究新的修复方法和提高牙齿的耐酸能力，采用二氧化碳气体激光在牙釉质表面涂覆几种陶瓷材料。将陶瓷粉末悬浮液涂于经37%磷酸（K-etchant, Kuraray Co.）处理过的牙釉质表面，然后用脉冲CO_2激光器（Opelaser/03S, Yoshida Co.）以1.0瓦的辐照强度照射牙釉质，辐照时间为30秒，焦点处光束尺寸为0.49mm。除辐照牙釉质表面直径3mm的圆外，其余表面均涂指甲油。将涂好的搪瓷样品浸入10 ml 0.1 m醋酸/醋酸钠缓冲液中，pH为4.0，浸泡30分钟。用火焰分析法测定了缓冲液中钙离子的释放量。磷酸钙玻璃（PGC）处理的搪瓷的耐酸性能有很大提高，氧化硅锆处理的搪瓷的耐酸性能略有提高，而金属陶瓷用瓷处理的搪瓷的耐酸性能没有提高。PGC处理后的牙釉质耐酸性能的提高可能是由于激光照射后熔化的PGC对牙釉质表面有很好的润湿作用，因为PGC的成分类似于硬牙组织，即磷酸钙。经氟离子+镧离子处理后的牙釉质具有良好的耐酸性能。因此，先用1%氟化钠水溶液，再用1%氯化镧水溶液对磷酸刻蚀后的牙釉质进行处理，然后用激光照射。然而，辐照后的牙釉质的耐酸性能并没有提高。

项目成果

レーザーによるセラミックス修復法(その2) セラミックス処理した歯質表面の耐酸性

使用激光的陶瓷修复方法（第二部分）陶瓷处理牙齿表面的耐酸性

• 发表时间: 2005
• 期刊: 神奈川歯科大学学会 第40回プログラム
• 作者: Hiraguchi H;Nakagawa H;Wakashima M;Miyanaga K;Sakaguchi S;Nishiyama M;平口久子;倉田茂昭ほか
• 通讯作者: 倉田茂昭ほか

Ceramics coating on enamel surface by a CO_2 laser (Part 2) Acid resistance of the enamel surface treated with the ceramics

CO_2激光在搪瓷表面进行陶瓷涂层（二）陶瓷处理后搪瓷表面的耐酸性

• 发表时间: 2005
• 期刊: Kanagawa Dental College 40^<th> general meeting, Yokosuka, Kanagawa. Abstract book
• 作者: Shigeaki Kurata;Tomotaro Nihei;Katsura Ohashi;Kozo Umemoto;Toshio Teranaka
• 通讯作者: Toshio Teranaka

炭酸ガスレーザーを用いたセラミックス融着による歯牙のう蝕予防

二氧化碳激光陶瓷融合预防龋齿

• 发表时间: 2004
• 期刊: 日本赤外線学会誌 14巻1号
• 作者: Hori N;Kimoto K;Aoki H;Kushida S;Toyoda M.;吉成正雄;平口久子;倉田茂昭ほか
• 通讯作者: 倉田茂昭ほか