Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Implant Dent. 2011 Oct;20(5):374-8. doi: 10.1097/ID.0b013e3182310e61.
To evaluate the fatigue resistance of 2 different CAD/CAM in-office monoceramic materials with single-tooth implant-supported crowns in functional area.
A metal experimental model with a dental implant was designed to receive in-office CAD/CAM-generated monoceramic crowns. Laterally positioned axial dynamic loading of 300 N at 2 Hz was applied to implant-supported crowns machined from 2 different glass materials for 100,000 cycle. Failures in terms of fracture, crack formation, and chipping were macroscopically recorded and microscopically evaluated.
Four of 10 aluminasilicate glass-ceramic crowns fractured at early loading cycles, the rest completed loading with a visible crack formation. Crack formation was recorded for 2 of 10 leucite glass-ceramic crowns. Others completed test without visible damage but fractured upon removal.
Lack in chemical adhesion between titanium abutment and dental cement likely reduces the fatigue resistance of machinable glass-ceramic materials. However, relatively better fractural strength of leucite glass-ceramics could be taken into consideration. Accordingly, progress on developmental changes in filler composition of glass-ceramics may be promising.
Machinable glass-ceramics do not possess sufficient fatigue resistance for single-tooth implant crowns in functional area.
评估两种不同 CAD/CAM 椅旁全瓷材料用于功能区单颗种植体支持的单冠的抗疲劳性能。
设计了一个带有牙种植体的金属实验模型，以接收椅旁 CAD/CAM 生成的单冠。对由两种不同玻璃材料加工而成的种植体支持的单冠进行侧向轴向动态加载，负荷为 300 N，频率为 2 Hz，共 100000 个循环。宏观上记录并微观评估了断裂、裂纹形成和崩裂等失效情况。
10 个硅酸铝玻璃陶瓷冠中有 4 个在早期加载循环时断裂，其余的则出现可见的裂纹形成后完成了加载。10 个透锂长石玻璃陶瓷冠中有 2 个出现裂纹形成。其他的则在没有可见损伤的情况下完成了测试，但在取出时断裂。
钛基台和牙科水泥之间缺乏化学黏附可能会降低可加工玻璃陶瓷材料的抗疲劳性能。然而，透锂长石玻璃陶瓷相对较高的断裂强度可以被考虑在内。因此，对玻璃陶瓷填料成分的发展变化的研究可能是有前途的。
可加工玻璃陶瓷不具备用于功能区单颗种植体冠的足够抗疲劳性能。
