Objective: Determine if the cement interface thickness and fabrication material of five post system modify the stress distribution to flared canals. Material and methods: The stress distributing characteristics associated with installation and function of Cast Post (Ni-Cr), Para-post (Steel post, Coltene-Whaladent), Integrapost (Titanium post, Premier), Mooser Post(Steel-post, Maillefer) and DT-Light Post (Quartz fiber post, Bisco Inc) were determined with a two-dimentional photoelastic stress analysis using a circular polariscope ( Photoelastic Inc ).Standardized enlarged canals were prepared in PSM-5 ( Measurements Group, Raleigh ;N.C) photoelastic sheets material with increasing sizes acrylic drills (Orico,Germany). All the posts were cemented with resin cement (Duo-Link,Bisco Inc).The cast post was made closely adapted to the canal walls and cemented with the same cement .Then the posts were loaded vertically and with a 35 degrees inclined load at 10,20 and 30 kilograms. Then the posts were photographed (Olympus 5050 Digital Camera) by use of the circular polariscope in the loaded and unloaded state. Qualitative measurement of the number (magnitude) and the closeness (concentrate) of the fringes were made. Results: The cast post with thinner cement interface showed the higher stress magnitudes at the vertical and lateral loading . All the metallic preformed post showed high stress concentration at the apical and cervical zones for the loads respectively .The fiber post at the vertical and lateral load showed the least magnitude and concentration of stress in the surrounding photoelastic material. Conclusions: Stress distribution surrounding post cemented in flared canals, done in photoelastic material, is related with the fabrication material of the post and with the thickness of the cement interface.

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