Comparative evaluation of push out bond strength of three different shapes of fibre posts: with and without silanisation : an in vitro study.
Aim: To evaluate and compare the push out bond strength of tapered, parallel tapered and double tapered epoxy resin fibre posts with two different surface treatments.
Methodology: A total of 48 samples were taken for the study. All the samples were decoronated. Biomechanical preparation was done and samples were obturated with 6% GP. The samples were stored for 48 hours thus allowing sealer to polymerise. These 48 samples were divided in 3 groups : tapered, parallel tapered, double tapered posts. Among these 8 samples treated with silane and 8 were without silanisation. Both post systems were cemented using Luxacore dual cure resin material. All specimens were stored for 24hrs in distilled water. Each specimen was cut horizontally into 5 sections each of 2mms and leaving a apical seal of 5mms. The first, third and fifth slices were used for the study. They were termed as coronal, middle and apical respectively. The push out bond strength was tested using the UTM (Instron). A push out test was applied at speed of 0.5mm/min with a 1mm diameter plunger from apical to coronal direction.
Results: The results of the present study showed that mean push out strength for double tapered postswere significantly greater than those for tapered post ¶llel tapered post. The mean retention values of the double tapered post, tapered & parallel tapered post were statistically different. The Double tapered post had the highest mean push out strength and this value was significantly higher than those of parallel & tapered post.
Conclusions: This study showed double tapered posts to have better retention than tapered and parallel posts.
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