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.

激光[Er：YAG（Erwin^R，60 mJ，10 pps），CO_2（Topal^R，1 W，0.3sec）]烧蚀牙本质可降低树脂粘接系统的粘接性能。所谓的“激光蚀刻”可能不能有效地促进粘附。未脱钙标本的透射电镜观察表明，酸蚀牙本质表面的形态变化在激光照射牙本质的次表层没有表现出来。由于结构缺陷和热变性层的形成，它在机械上被削弱，从而导致相当低的粘合性能。与平坦表面相比，在楔形缺陷中获得了显著较低的粘结强度。结构因子（C-factor）可能是影响牙本质粘接强度的一个重要因素，而高能激光（Er：YAG：250 mJ，10 pps，CO_2：3 W，0.3sec）对牙本质粘接强度几乎没有影响。低功率激光（Er：YAG：60 mJ，1 pps，CO_2：1 W，0.3sec）照射牙本质后，脱钙牙本质表面形成无定形基质（Er：YAG：3 ~ 4μm，CO_2：1 ~ 2μm），基质中含有变性胶原纤维。而高功率激光（Er：YAG：250 mJ，1 pps，CO_2：3 W，0.3sec）处理牙本质，其形态结构与正常牙本质（Er：YAG）或牙本质表层（CO_2）几乎没有区别，牙本质表层有少量无定形基质和胶原纤维断裂，并有横纹。认为高能激光烧蚀的效果可能仅限于表层。CO_2激光照射（1 W，0.3sec）龋坏牙本质后，牙本质表面几乎没有热变性层，与低速钢布尔斯钻的牙本质表面几乎没有热变性层。龋病影响的牙本质作为树脂粘接系统的粘接剂时，需要进一步的研究。

项目成果

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

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

荒川 真: "回転切削器具により切削した象牙質に対する接着強さ"日本歯科保存学雑誌. 46(秋季特別号). 74 (2003)

Makoto Arakawa：“用旋转切割仪器切割牙本质的粘合强度”日本保守牙科杂志 46（秋季特刊）74（2003 年）。

Hideaki Shintani: "Studies on Laser Applications to Dental Hard Tissues"Dentistry in Japan. 39. 193 (2003)

Hideaki Shintani：“激光应用于牙齿硬组织的研究”日本牙科。