Root Canal Retreatment

A previously treated tooth can develop new problems months or years after the original root canal. Common causes include a canal that was not detected during the first treatment, delayed placement of the permanent crown allowing bacteria to re-enter the tooth, complex or curved canal anatomy that limited initial cleaning, new decay reaching the root canal filling, or a fracture in the tooth structure. When this happens, the tooth often becomes tender, develops swelling, or shows signs of infection on imaging, and retreatment is typically the next step before considering extraction.

Root canal retreatment begins with a thorough evaluation, including high-resolution imaging and often cone beam CT to map the canal system and identify what was missed or compromised in the original procedure. The existing filling material is carefully removed, the canals are reshaped and disinfected, any previously untreated anatomy is addressed, and the tooth is resealed. The complexity of retreatment varies considerably from one case to the next, and treatment may be completed in one or two visits depending on what is found inside the tooth. After the canals are sealed, the patient returns to the referring general dentist for a new permanent restoration.

Dr. Malhan and the Tri-City Endodontics team have practiced in Pasco for more than 25 years and regularly receive retreatment referrals from general dentists throughout the Tri-Cities region. Each case is evaluated individually, since the success of retreatment depends on factors specific to the tooth, including remaining tooth structure, the condition of surrounding bone, and whether a fracture is present. Patients are informed of these findings and the realistic prognosis before treatment begins, so the decision to proceed with retreatment, apical surgery, or extraction is made with a clear understanding of the options