Direct Observation of Fracture process in bond system between all-ceramic restorations and adhesive resin cements

全瓷修复体与树脂水门汀粘结体系断裂过程的直接观察

• 批准号: 18592155
• 负责人: WAKAMATSU Nobukazu
• 金额: $ 1.82万
• 依托单位: Asahi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18592155/
• 关键词: All-ceramic restoration; Adhesive resin cement; Adhesion; Fracture process; CAD; CAM; Grinding; Damages; 研削加工; 歯科材料; セラミックス

In IPS Empress 2 all-ceramic system, the restorations are fabricated by veneering porcelain on the copings hot-pressed, however, the effects of multiple firing for veneering on the bond strength between IPS Empress 2 core ceramics and a adhesive resin cement are not clarified. In this study, the micro-tensile bond strength between the core ceramics and a resin cement was evaluated. From the statistical analysis, the mean bond strength was not significantly different for unheated (41.5 Mpa) and for heated four times (39.1 Mpa). It was also found that the multiple firing for veneering significantly influenced the Weibull plots of the bond strength. It is thought that the all-ceramic crowns machined under brittle-mode grinding contain various subsurface cracks, and these cracks decrease the strength the crowns. However, the kind, the size and the location of the cracks actually occur in the crowns machined by CAD/CAM systems are not clarified. In this study, evaluation of the subsurface damages in CAD/CAM machined all-ceramic crowns were carried out using the bonded-interface sectioning technique. From the SEM observation, it is concluded that Median and Lateral cracks were generated by grinding at the ridge, the margin, the axial wall and the inner surface of the crowns, and these cracks can be the fracture origin of the crown under cyclic occlusal loadings.

在IPS Empress 2全陶瓷系统中，修复体是在热压涂层上贴面制备的，但多次烧制贴面对IPS Empress 2核心陶瓷与胶粘剂树脂水泥的结合强度的影响尚不清楚。在这项研究中，评估了核心陶瓷和树脂水泥之间的微拉伸粘结强度。从统计分析来看，未加热（41.5 Mpa）和加热4次（39.1 Mpa）的平均粘结强度无显著差异。贴面多次烧制对粘结强度的威布尔图有显著影响。认为脆性磨削加工的全陶瓷冠存在各种亚表面裂纹，这些裂纹降低了冠的强度。然而，在CAD/CAM系统加工的冠中实际发生的裂纹的种类、大小和位置尚未明确。在本研究中，采用结合界面切片技术对CAD/CAM加工全瓷冠的亚表面损伤进行了评价。通过扫描电镜观察可知，在牙冠的脊、缘、轴壁和内表面，磨蚀作用产生了中间裂纹和侧向裂纹，这些裂纹可能是牙冠在循环咬合载荷作用下断裂的原因。

项目成果

Influence of multiple firing on the microtensile bond strength between Empree 2 core ceramics and a resin cement system

多次烧成对 Empree 2 芯陶瓷与树脂水泥系统之间微拉伸粘合强度的影响

• 发表时间: 2007
• 期刊: Dental Materials Journal 26(in press)
• 作者: NONOGAKI R;UNO M;KURACHI M;WAKAMATSU N;DOI Y.;Wakamatsu N;Wakamatsu N;Wakamatsu N
• 通讯作者: Wakamatsu N

Effect of multiple firing of IPS Empress 2 core material on the bond strength to a adhesive resin cement.

IPS Empress 2 芯材多次烧制对树脂水泥粘合强度的影响。

• 发表时间: 2007
• 作者: HATA U;WAKAMATSU N;YAMAMURA O;DOI Y;FUJIWARA S.
• 通讯作者: FUJIWARA S.

Direct observation of subsurface damages in all-ceramic crowns Fabricated by a CAD/CAM system

直接观察 CAD/CAM 系统制作的全瓷冠的亚表面损伤

• 发表时间: 2008
• 期刊: Dental Materials Journal 27(in press)
• 作者: Takita F;Iwahori M;Wakamatsu N;et. al.;HATA U.;HATA U.;NONOGAKI R
• 通讯作者: NONOGAKI R

CAD/CAMにより研削加工された歯科用セラミックスの曲げ強さに与えるグレージングの影響

CAD/CAM 磨削的釉面对牙科陶瓷弯曲强度的影响

• 发表时间: 2008
• 作者: NONOGAKI R;UNO M;KURACHI M;WAKAMATSU N;DOI Y.;Wakamatsu N;Wakamatsu N;Wakamatsu N;野々垣 龍吾
• 通讯作者: 野々垣 龍吾

Evaluation of residual stress in CAD/CAM machined all-ceramic crowns using Indentation method.

使用压痕法评估 CAD/CAM 加工全瓷冠的残余应力。

• 发表时间: 2008
• 期刊: Dental Materials Journal 27(in press)
• 作者: NONOGAKI R;UNO M;KURACHI M;WAKAMATSU N;DOI Y.
• 通讯作者: DOI Y.