Yli-Urpo Topias, Lassila Lippo, Närhi Timo, Vallittu Pekka
Institute of Dentistry, University of Turku, Turku, Finland.
Department of Biomaterials Science and Turku Clinical Biomaterials Center (TCBC), Institute of Dentistry, University of Turku, Turku, Finland.
Dent Mater. 2025 Feb;41(2):212-219. doi: 10.1016/j.dental.2024.11.004. Epub 2024 Dec 6.
To evaluate the influence of cement layer and veneer thickness on load-bearing capacity of tooth restored with hybrid ceramic (HC) and lithium-disilicate glass ceramic (LDGC) occlusal veneer restorations.
Cement layer thickness was set at either 50 µm or 200 µm and tooth restored either with 0.5 mm or 1.8 mm thick HC Cerasmart270 (GC) or LDGC IPS e.max CAD (Ivoclar Vivadent) occlusal veneers. For this study, 64 extracted human molar teeth were selected and divided into 8 groups. Prepared teeth were scanned, and occlusal veneers were manufactured using CAD/CAM technology (Cerec, Dentsply-Sirona). Finished veneers were luted to preparations using self-adhesive resin cement (G-CEM ONE) according to manufacturers' instructions. Teeth were loaded quasi-statically and ultimate fracture loads were recorded. Fracture types were analyzed and classified visually. Statistical analysis was performed using two-way ANOVA.
With HC occlusal veneers, thickness of both veneer and cement layer had no significant influence on fracture load. The lowest mean ultimate fracture load value was found in 0.5 mm thick LDGC veneers group with 200 µm cement layer, which was significantly lower loading value compared with that of 1.8 mm thick LDGC veneers or any of HC veneers (p ≤ 0.0280). LDGC veneers with 0.5 mm thickness showed fractures within the veneer, whereas in other groups fractures of the tooth substance was also detected.
Within the limitations of this study, it can be concluded that thin HC occlusal veneers provided higher load-bearing capacity than LDGC counterparts of the same thickness. HC veneers were also less sensitive to the effect of cement layer thickness.
评估粘结层和贴面厚度对采用混合陶瓷（HC）和二硅酸锂玻璃陶瓷（LDGC）咬合面贴面修复牙齿的承载能力的影响。
粘结层厚度设定为50 µm或200 µm，使用0.5 mm或1.8 mm厚的HC Cerasmart270（GC）或LDGC IPS e.max CAD（义获嘉伟瓦登特）咬合面贴面修复牙齿。本研究选取64颗拔除的人类磨牙，分为8组。对预备好的牙齿进行扫描，并使用CAD/CAM技术（西诺德牙科系统公司的Cerec）制作咬合面贴面。根据制造商的说明，使用自粘结树脂水门汀（G-CEM ONE）将完成的贴面粘结到预备体上。对牙齿进行准静态加载，并记录最终断裂载荷。对断裂类型进行视觉分析和分类。采用双向方差分析进行统计分析。
对于HC咬合面贴面，贴面和粘结层的厚度对断裂载荷均无显著影响。在粘结层厚度为200 µm的0.5 mm厚LDGC贴面组中发现最低的平均最终断裂载荷值，与1.8 mm厚LDGC贴面组或任何HC贴面组相比，该加载值显著更低（p≤0.0280）。厚度为0.5 mm的LDGC贴面在贴面内出现断裂，而在其他组中也检测到牙体组织的断裂。
在本研究的局限性范围内，可以得出结论，薄的HC咬合面贴面比相同厚度的LDGC贴面具有更高的承载能力。HC贴面也对粘结层厚度的影响不太敏感。
