Retention of serrated endodontic posts with a composite luting agent: effect of cement thickness.

When Prosthodent composite was used as a cementation material for endodontic posts (ParaPost), adaptation of the post to the canal was not crucial. Changes of the composite layer thickness up to 500 microns did not decrease retention. Variation in the diameter of the posts did not effect the retention. The retention obtained for the combinations of posts and cements was high and suitable to resist dislodgment of the posts. Consequently, the thinnest post in the root canal, cemented with a composite is recommended. Thus the removal of tooth structure is unnecessary because the cylindrical preparation is formed in the composite.