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An in vitro evaluation of a carbon fiber-based post and core system
G E Sidoli1, P A King, D J Setchell
1University of Bristol Dental Hospital, England.
Statement Of Problem:
A self-contained post and core system, Composipost, comprising an epoxy-based carbon fiber post, a composite core material, and a low viscosity Bis-GMA bonding resin, has recently been marketed for the restoration of pulpless teeth.
Purpose:
This study compared the in vitro performance and the failure characteristics of the Composipost system against existing post and core combinations.
Material And Methods:
Using extracted human teeth, three post and core test groups and one control group were then tested to failure with an obliquely applied compressive load at 130 degrees in a Hounsfield testing-machine with a crosshead speed of 5 cm/minute.
Results:
The mean stress values at failure (MNm.2) with standard deviations for each group were as follows: Composipost system 8.89, SD 2.40; stainless steel post and composite core 14.18, SD 3.49; cast gold alloy post and gold alloy core 15.25, SD 4.07; and endodontically treated tooth only 24.84 SD 4.58.
Conclusion:
The specimens restored with the Composipost system exhibited inferior strength properties in comparison to the other post and core systems tested (p < 0.01). Teeth without post and core foundations tested significantly stronger than the other comparison groups (p < 0.01).