Fracture strength of three all-ceramic systems: Top-Ceram compared with IPS-Empress and In-Ceram.
OBJECTIVE
The purpose of this study was to investigate the fracture loads and mode of failure of all-ceramic crowns fabricated using Top-Ceram and compare it with all-ceramic crowns fabricated from well-established systems: IPS-Empress II, In-Ceram.


METHODS
Thirty all-ceramic crowns were fabricated; 10 IPS-Empress II, 10 In-Ceram alumina and 10 Top-Ceram. Instron testing machine was used to measure the loads required to introduce fracture of each crown.


RESULTS
Mean fracture load for In-Ceram alumina [941.8 (± 221.66) N] was significantly (p > 0.05) higher than those of Top-Ceram and IPS-Empress II. There was no statistically significant difference between Top-Ceram and IPS-Empress II mean fracture loads; 696.20 (+222.20) and 534 (+110.84) N respectively. Core fracture pattern was highest seen in Top- Ceram specimens.
Department of Restorative Dentistry, University of Sharjah, Sharjah, UAE. falquran@sharjah.ac.ae
Firas Al
FA
Quran
Reem
R
Haj-Ali
D000537:Aluminum Oxide; D002484:Cementation; D019245:Compressive Strength; D003442:Crowns; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D019231:Tooth Preparation, Prosthodontic
C493120:lithia disilicate; D003776:Dental Porcelain; D000537:Aluminum Oxide