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Tooth Restoration with Post and Composite Resin

After the root canal treatment, sometimes it is necessary to retain the post inside the root canal. Since clinical and laboratory data indicate that teeth are not strengthened by posts, their purpose is for retention of a core that will provide appropriate support for definite crown. Furthermore, post and cores had an average absolute rate of failure of 9 %, and an apical periodontitis was significantly more common in teeth with posts than in endodontically treated teeth without posts. Some studies indicate that post loosening is the most common cause of post and core failure. Root fracture was the second most common cause followed by post fracture. Due to this, it is very important to choose the right post technique prior the clinical procedure. A frequently used and clinically appropriate guideline for post diameter is do not exceed one-third the root diameter. According to the laboratory date, threaded posts provide the greatest retention, followed by cemented parallel-sided posts. Tapered cemented posts are the least retentive. Threaded posts produce the greatest potential for root fracture and most of the clinical data support the laboratory findings. A wide range of recommendations have been made regarding post length. Reasonable clinical guidelines for length is that post should be approximately three-quarters the length of the root when treating long – rooted tooth or, the post length is dictated by retaining 5 mm of apical gutta-percha. The post should be extended to the gutta-percha. Recently, posts made from carbon fiber, ceramic materials, and fiber reinforced polymers have been introduced. Fiber-reinforced posts are made of woven polyethylene fiber ribbon that is coated with a dentine bonding agent and comparing to the metal posts, reduce the incidence of vertical root fracture. In a most clinical situation, author prefers to use prefabricated non-metal post designed for cementation whenever possible as well as resin bonding procedure for cementation.

Restoration; Post; Composite resin

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