Shafi Mowaffq Abdulhamed, Rayyan Mohammad Ramadan
Prosthdontic Department, College of Dentistry, Riyadh Elm University, P.O. Box: 84891, Riyadh, 11681, Saudi Arabia.
Clin Oral Investig. 2023 Jan;27(1):339-344. doi: 10.1007/s00784-022-04728-y. Epub 2022 Oct 5.
This study aimed to compare the failure load of heat-pressed versus milled lithium disilicate endocrowns.
Twenty extracted mandibular molars were sectioned 1.5 mm above the CEJ. Root canal treatment and endocrown preparation were done for all teeth. Samples were then divided into two groups: heat-pressed glass ceramic endocrowns (HP group) (n = 10) and milled endocrowns (CAD group) (n = 10). Cementation was done using self-adhesive resin cement, and a compressive load was applied on the occlusal surface of the specimens until failure occurred.
The mean failure loads were significantly higher in the HP group (2546.5 ± 339 N) compared to the CAD group (1759.9 ± 114.2) (p < 0.05), and majority of failures were due to fracture of the restoration.
Failure loads of heat-pressed lithium disilicate endocrown are superior to milled endocrown.
Molars restored with lithium disilicate endocrowns have higher failure loads than the maximum human bite force regardless of the fabrication method. Although heat-pressed endocrowns have superior failure loads to milled ones, both are indicated for restoring endodontically treated molar teeth.
本研究旨在比较热压成型与铣削加工的二硅酸锂全瓷内冠的破坏载荷。
选取20颗拔除的下颌磨牙，在牙釉质牙骨质界上方1.5毫米处进行切割。对所有牙齿进行根管治疗和全瓷内冠预备。然后将样本分为两组：热压玻璃陶瓷全瓷内冠组（HP组）（n = 10）和铣削加工全瓷内冠组（CAD组）（n = 10）。使用自粘结树脂水门汀进行粘结，并在试件的咬合面上施加压缩载荷直至发生破坏。
HP组的平均破坏载荷（2546.5±339牛）显著高于CAD组（1759.9±114.2牛）（p < 0.05），且大多数破坏是由于修复体断裂。
热压成型的二硅酸锂全瓷内冠的破坏载荷优于铣削加工的全瓷内冠。
无论制作方法如何，用二硅酸锂全瓷内冠修复的磨牙的破坏载荷均高于最大人类咬合力。尽管热压成型的全瓷内冠的破坏载荷优于铣削加工的全瓷内冠，但两者均适用于修复根管治疗后的磨牙。
