Jundishapur Journal of Medical Sciences

Jundishapur Journal of Medical Sciences

An in vitro study of resistance to vertical fracture in restored teeth of four types of post and core systems

Document Type : Original Article

Authors
1 Departmant Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
2 Dentist
Abstract
Background and Objective: Endodontically treated teeth with extensive loss of coronal structure can be restored with various post systems. Choosing a right type of post will affect the life of the final restoration. The aim of study was to investigate the fracture resistance of endodontically-treated teeth restored using a suggestive and three conventional post systems.
Subjects and Methods: Forty extracted and endodontically treated premolars were decoronated 1 mm coronal to CEJ. the teeth were randomly divided into four restorative groups: Group 1, cast post and core; 2, fiber post and composite core; 3, suggestive
stainless steel post and composite core; 4, titanium post and composite core. In all groups, posts were cemented with a resin cement (Panavia F). Each root was embedded in an acrylic resin block and loaded vertically in a universal testing machine at a crosshead speed of 0.5 mm/minute until fracture. The data were recorded and analyzed using one-way ANOVA and Tukey tests.
Results: The teeth restored with cast post and core demonstrated fracture resistance (162 N) significantly higher than other groups (P<0.001). The fracture resistance in fiber glass post group (133 N) was significantly higher than that in stainless steel and titanium post groups (P<0.001). The difference of fracture resistance between stainless steel post group (102 N) and titanium post group (90 N) was not significant (P=0.28).       
Conclusion: The results of study indicated that endodontically treated premolars restored with cast or fiber glass post systems are more resistant to fracture compared to stainless steel and titanium posts.
Keywords

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Volume 12, Issue 5 - Serial Number 86
July and August 2013
Pages 531-540

  • Receive Date 27 October 2012
  • Revise Date 16 March 2013
  • Accept Date 14 September 2013