Failure loads of heat-pressed versus milled lithium disilicate endocrowns.

Abstract

This study aimed to compare the failure load of heat-pressed versus milled lithium disilicate endocrowns. Twenty extracted mandibular molars were sectioned 1.5mm 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 ± 339N) 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.