There are some cases where root canal therapy is not going to be as successful as we would like. One solution available to dentist is the apicoectomy. Apicoectomy is an excision microsurgery of the extreme part of a tooth's root and its removal with the surrounding pathological tissues which are often the reason for most of the unsuccessful root canal therapies.

When a large proportion of tooth tissue is missing (> 40%) either due to long amounts of caries, or due to fracture, or due to previous root canal therapy, this tooth usually needs to be restored with a post placement in the root to strengthen it. In the prefabricated posts the post can be made of carbon fiber or fiberglass, or in the cast posts of metal or gold. The post type selection, which will be placed, is made by the dentist based on the post properties that concern: biocompatibility, physicochemical properties, handling characteristics, aesthetic and financial costs.

The root canal therapy's purpose is to remove the pulp (vessels and nerves inside the tooth), and ultimately the aseptic and hermetic seal of the teeth roots. This procedure takes place with the use of small tools, called files (needles), or rotary NiTi files which are supported in a special handpiece. The entire procedure is completed usually in 2-3 visits, or even in 1 at our dental clinic. Endodontics are essentially engaged in the treatment of the intense pain of a tooth (pulpitis), that is contaminated with bacteria.