Dr Muhammad Shakeel Akram Khawaja, Dr Amna Masood, Dr Zahid Akhter
Objective: The purpose of this analysis was to compare the strength of the fracture of the human teeth managed with lithium disilicate onlays without or with post-fiber accumulation. Study Design: A comparative study. Place and duration: In the Department of Prosthodontics of Punjab Dental Hospital, Lahore for one year period from December 2017 to December 2018. Methods: 20 human mandibular molars were sectioned horizontally and into 2 groups were divided (n = 10). In Group A; no treatment was given. Endodontically, group B teeth were treated formed using a composite core or fiber post and providing a 1 mm circumferential chamfer were prepared. The lithium layers of disilicate were bonded and pressed to the teeth using a double-cured cementing compound. Under static load; Teeth were examined. Failure loads are graded as recoverable or non-recoverable. By a one-way variance analysis; Failure loads were determined. Using Pearson Chi-square tests; failure modes were compared. Results: 1383.5 N for group A was the mean load of fracture and for group B it was 1286.3 N (p = 0.6). 90% of the fractures were graded as non-recoverable in these groups (p = 0.8). Conclusions: The presence of fiber post accumulation to give power and retention does not affect the strength of fracture of the teeth managed by lithium disilicate layers and adhesive procedures. Keywords: Ferrule effect; all ceramic; onlays; lithium disilicate refraction test.