Endodontics

Definition

Endodontics is the branch of Dentistry concerned with the morphology, physiology, and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including the biology of the normal pulp and the etiology, diagnosis, prevention, and treatment of diseases and injuries of the pulp and associated periradicular conditions.

Anatomy of the Internal Tooth

The internal structure of the tooth is divided into:

Pulp Chamber: The central portion in the crown of the tooth.
Root Canals: The extensions of the pulp that run the length of the root to the apical foramen (the opening at the tip).
Dental Pulp: A specialized loose connective tissue containing the neurovascular bundle.

Common Procedures

Root Canal Therapy (RCT)

The most common endodontic procedure, involving the removal of diseased pulp tissue.

Anesthesia and Isolation: Use of a Rubber dam is mandatory to maintain a sterile field.
Cleaning and Shaping: Utilizing hand files or NiTi rotary files to remove bacteria and debris.
Disinfection: Chemical irrigation with antimicrobial solutions.
Obturation: Three-dimensional sealing of the canal system, typically with Gutta-percha.

Endodontic Microsurgery

When conventional RCT fails or cannot be performed, an Apicoectomy may be necessary. This involves the surgical removal of the root tip and a retrograde filling of the canal.

Vital Pulp Therapy

Procedures such as Pulpotomy or Pulp Capping aimed at preserving the vitality of the pulp, frequently performed in pediatric patients with immature permanent teeth.

Technological Innovations

CBCT Imaging: Allows for the detection of extra canals (e.g., MB2 in maxillary molars) and periapical lesions in 3D.
Ultrasonics: Used for removing calcifications, posts, and activating irrigants for better cleaning.
Bioceramic Sealers: Highly biocompatible materials that expand slightly upon setting to provide an exceptional seal.

Clinical Success and Prognosis

Endodontic treatment has a high success rate (often >90%). Factors affecting prognosis include:

The presence of a pre-operative periapical lesion.
The quality of the final coronal restoration (Crown).
The complexity of the root canal anatomy.