Ultra-morphological and analytical-chemical changes of lased carious dentin and adhesive properties of resin bonding systems

激光龋齿牙本质的超形态和分析化学变化以及树脂粘合系统的粘合性能

• 批准号: 15592020
• 负责人: FUJITANI Morioki
• 金额: $ 1.86万
• 依托单位: Hiroshima University
• 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 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15592020/
• 关键词: Er:YAG Laser; CO_2 laser; Ultra-morphological study; Analytical-chemical study; Caries-affected dentin; Adhesive resin; C-factor; Irradiation energy; 象牙質接着; CO_2レーザー; 形態学的研究

Laser ablation [Er:YAG (Erwin^R, 60mJ, 10pps), CO_2 (Topal^R, 1W, 0.3sec)] of dentin reduced adhesive properties of resin bonding systems. The so-called "laser-etching" might not be effective in promoting the adhesion. By the TEM observations of non-decalcified specimens, such morphological changes as observed in the acid-etched dentin surface could not be detected in the subsurface layer of the lased dentin. It was mechanically weakened due to the formation of structural defects and heat-denatured layer, leading to considerably lower adhesive properties. Significantly lower bond strength was obtained in the wedge-shaped defects, as compared with the flat surfaces. Configuration factor (C-factor) might be an important factor especially for the adhesion to lased dentin.However, high-energy laser ablation of dentin (Er:YAG : 250mJ, 10pps, CO_2 : 3W, 0.3sec) hardly reduced the bond strength. In the subsurface layer of low-power lased dentin (Er:YAG : 60mJ, 1pps, CO_2 : 1W, 0.3sec), TEM observations of decalcified specimens revealed that the amorphous matrix substances containing denatured collagen fibers were generated (Er:YAG : 3〜4μm, CO_2 : 1〜2μm). On the other hand, in the high power lased dentin (Er:YAG : 250mJ, 1pps, CO_2 : 3W, 0.3sec), such morphological structure as hardly distinguished from sound dentin (Er:YAG) or the subsurface dentin layer having both little amorphous matrix and torn collagen fibers with cross-striation (CO_2) was observed. It was considered that the effects of high-energy laser ablation might be limited to superficial layer. CO_2 laser irradiation (1w, 0.3 sec) of carious dentin produced almost the same morphology with little heat-denatured layer as that by low-speed steel burs.It was concluded that the amount of irradiation energy and/or the value of c- factor had to be considered when evaluating the adhesive properties. Further investigation was necessary when caries-affected dentin was used as an adherent of resin bonding systems.

牙本质的激光烧蚀[Er:YAG (Erwin^R, 60mJ, 10pps), CO_2 (Topal^R, 1W, 0.3sec)]降低了树脂粘合系统的粘合性能所谓的“激光蚀刻”可能不是。通过对未脱钙标本的TEM观察，在酸蚀牙本质表面观察到这种形态变化。由于结构缺陷和热变性层的形成，在激光牙本质的表层下无法检测到，导致楔形缺陷的粘合强度显着降低。与平坦表面相比，配置因子（C 因子）可能是一个重要因素，尤其是对于激光牙本质的粘附性。然而，高能激光烧蚀牙本质（Er:YAG ：脱钙标本的 TEM 观察显示，250mJ，10pps，CO_2：3W，0.3sec）几乎没有降低低功率激光激光牙本质表面层（Er：YAG：60mJ，1pps，CO_2：1W，0.3sec）的粘合强度。生成了含有变性胶原纤维的无定形基质物质（Er:YAG:另一方面，在高功率激光牙本质（Er:YAG：250mJ，1pps，CO_2：3W，0.3秒）中，这种形态结构与健全牙本质（Er）几乎没有区别。 ：YAG）或具有少量无定形基质和具有交叉条纹的撕裂胶原纤维的表层下牙本质层观察到高能激光消融的效果可能仅限于龋齿牙本质的表层（1w，0.3秒），产生的形态与龋齿牙本质几乎相同，几乎没有热变性层。结论是，在评估粘合性能时，必须考虑辐照能量的大小和/或 c 因子的值，当需要进一步研究时。受龋齿影响的牙本质被用作树脂粘合系统的粘合剂。

项目成果

Studios on Laser Applications to Dental Hard Tissues

牙科硬组织激光应用工作室

• 发表时间: 2003
• 期刊: Dentistry in Japan 39
• 作者: 北川解士;冨士谷 盛興;白井 憲一;荒川 真;播磨 貴裕;Hideaki Shintani
• 通讯作者: Hideaki Shintani

Adhesive properties of resinous materials to lased dentin - Effects of C-factor -

树脂材料与激光牙本质的粘合性能 - C 因子的影响 -

• 发表时间: 2003
• 期刊: Program and Abstracts of 15^<th> Annual Meeting of the Japanese Society for Laser Dentistry 65
• 作者: 北川解士;冨士谷 盛興;白井 憲一;荒川 真;播磨 貴裕;Hideaki Shintani;新谷 英章;Morioki Fujitani;Kenichi Shirai;Makoto Arakawa;Takahiro Harima
• 通讯作者: Takahiro Harima

各種象牙質切削方法がレジンの接着に及ぼす影響について

不同牙本质切割方法对树脂粘附的影响

• 发表时间: 2004
• 期刊: 広島大学歯学雑誌 36・2
• 作者: 山本俊郎;喜多正和;木村 功;大迫文重;雨宮 傑;佐々木 充;中西 哲,金村成智;北川解士
• 通讯作者: 北川解士

Bond strength adhesive systems to dentin prepared by rotary cutting instruments

通过旋转切割器械制备的牙本质粘合强度粘合剂系统

• 发表时间: 2004
• 期刊: The Japanese Journal of Conservative Dentistry 47-Spring issue

Lasers in Dentistry Revolution of Dental Treatment in the New Millennium

激光在牙科中新千年牙科治疗的革命

• 发表时间: 2003
• 作者: 北川解士;冨士谷 盛興;白井 憲一;荒川 真;播磨 貴裕;Hideaki Shintani;新谷 英章;Morioki Fujitani;Kenichi Shirai;Makoto Arakawa;Takahiro Harima;Hideaki Shintani;Hideaki Shintani;Isao Ishikawa
• 通讯作者: Isao Ishikawa