Related Experiment Video
Updated: Aug 26, 2025
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Failure loads of heat-pressed versus milled lithium disilicate endocrowns
Mowaffq Abdulhamed Shafi1, Mohammad Ramadan Rayyan2
1Prosthdontic Department, College of Dentistry, Riyadh Elm University, P.O. Box: 84891, Riyadh, 11681, Saudi Arabia.
Objectives:
This study aimed to compare the failure load of heat-pressed versus milled lithium disilicate endocrowns.
Materials And Methods:
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.
Results:
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.
Conclusions:
Failure loads of heat-pressed lithium disilicate endocrown are superior to milled endocrown.
Clinical Relevance:
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.
