| Summary: | Background: In order to ensure sufficient resistance against functional forces for dentin, which is severely weakened by excessive material loss in single-root single-canal teeth with previous root canal treatment, maximum retention and resistance must be the target.
The main purpose of this study is to evaluate the shear rupture resistance of the chosen three kinds of posts placed in the teeth roots, against forces that could occur in the replicated mouth.
Methods: Freshly extracted 45 teeth -maxillary canin and maxillary central- have been used in our study. Crown portion of the tooth was removed by cutting away 1 mm over the enamel cement junction. Root canals were obturated with a lateral condensation technique using AH-26 and gutta percha sealer. In the study, 15 specimens each from Flexi-Post, Cosmopost, and FRC Postec post systems have been placed in sockets opened down through teeth by using specific burs for each system. A dual cured composite cement (Variolink II low viscosity) was used to bind posts. Prepared specimens were put in steel hose by using acrylic resin. Standardized core material (Coradent) was applied onto top side of posts, and steel hoses were connected to Lloyd test instrument with an angle of 45 degrees. A force with a speed of 1 mm/min was applied to the specimens. Compression shear rupture values were recorded and One Way ANOVA and Kruskall-Wallis variance analyses were conducted for statistical evaluation.
Results and Conclusion: Highest values were obtained in Flexi-Post group. FRC Postec was the second, and Cosmopost had the lowest strength values. However, all the systems provided adequate resistance against forces that could occur in the mouth, hence it was concluded that they can be utilized clinically.
Key words: posts and cores, post system, prefabricated post systems
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