An in vitro study of resistance to vertical fracture in restored teeth of four types of post and core systems
Message:
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.
Language:
Persian
Published:
Jundishapur Scientific Medical Journal, Volume:12 Issue: 5, 2013
Pages:
531 to 540
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