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Fracture Resistances of Cast Metal and Ceramic Dowel and Core Restorations: A Pilot Study
Author(s) -
Yalçın Emine,
Çehreli Murat C.,
Canay Şenay
Publication year - 2005
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2005.00016.x
Subject(s) - dowel , crosshead , materials science , ceramic , fracture (geology) , dentistry , universal testing machine , tooth fracture , composite material , orthodontics , flexural strength , medicine , ultimate tensile strength
Purpose:The purpose of this study was to compare fracture strengths of teeth restored with cast metal and ceramic dowel and cores supporting all‐ceramic crowns.Materials and Methods:Eighteen recently extracted teeth were randomly divided into 3 equal groups. Metal dowel and cores (MDC) were fabricated for 1 group using a base metal alloy, and served as the control. The other groups received In‐Ceram Spinell ® (ICS) and IPS Empress 2 ® (IPS) dowel and cores. IPS Empress 1 crowns were fabricated for all samples. Each tooth was subjected to a shear force at a crosshead speed of 2 mm/min on a universal testing machine until failure occurred.Results:The mean fracture strengths and standard deviations of MDC, ICS, and IPS restorations were 1101 N (361), 832 N (288), and 1137 N (367), respectively. The differences between groups were insignificant ( p < 0.05). Fractures of the all‐ceramic crowns were observed in the MDC group, whereas the failure of ceramic dowel and core restorations was associated with root fracture at the cervical region.Conclusions:Due to improved mechanical properties, In‐Ceram Spinell ® and IPS Empress 2 ® ceramic dowel and cores may be candidates for the restoration of endodontically treated anterior teeth.