The causes of root canal failure can be divided into two types: medically and biologically induced
Microbial infection is one of the more important causes of failure after root canal treatment. Depending on where the source of infection is present, microbial infections can be classified as either intracanal or extracanal infections. The longer the microorganism is present in the tooth, the more difficult it is to treat.
Medical failures include:improper asepsis, improper root canal preparation, and improper root canal filling. Here are four examples of typical cases of root canal failure.
Case 1: Treatment instruments left in the root canal
A patient had root canal treatment several years ago and recently had swollen gums. According to the patient’s self-report, he had a root canal retreatment. The root canal retreatment was done because instruments were left inside the tooth. Several years later, this patient returned to the office for a checkup. The dentist found that the instruments were still inside the tooth after an x-ray examination.
During root canal treatment, there is a chance that the instruments will break. If the instruments are not infected causing infection in the tooth. There is no problem if the instruments are not removed. However, this patient’s gums were already red and swollen, which proved that the instruments had infected the tooth. Finally, the dentist used a microscope and ultrasound to remove the fractured instrument. The dentist then disinfected the root canal again and the patient was in remission.
Case 2: Bacterial Infestation
A patient wore a metal crown after root canal treatment. But a few years later the crown fell off. After examining the tooth, the dentist found that this patient’s tooth was badly decayed. Upon questioning, it was learned that this patient did not like to brush his teeth. Every time after eating late food, this patient did not remove the food debris from his teeth. As a result, the bacteria in the teeth were increasing and damaging the surface of the teeth. The crown of the tooth fell off because of the missing tooth.
Case 3: Too many root canals
A patient returned to the clinic after three days of treatment because of swelling and pain. The dentist found that this patient had 5 root canals after the X-ray radiograph. And the treating dentist only cleaned 4 root canals. Normal people have one to three root canals, and some people have a large number of root canals. Therefore the root canal will be left with the number of roots of the untreated tooth. If the dentist does not find the extra root canals. The dentist will not be able to disinfect and fill all the roots with medication. The root tip of the tooth will then retain pus. The pus can cause swelling of the gums and pain in the tooth. Finally, the dentist performs root canal retreatment on the patient. All root canals were completed for treatment.
Case 4: The tooth nerve was dead.
A patient came to the clinic after a severe toothache. This patient requested to preserve the nerve of the tooth during treatment. The dentist did his best to preserve the nerve of the tooth. The dental nerve can continuously deliver nutrients to the tooth. The tooth’s life expectancy will increase a lot. However, the preserved tooth root may have been necrotic. Even if the dentist forces the tooth to be preserved. The roots can still bring inflammation to the tooth. Therefore, if the dentist does not completely remove the nerve, the chances of root canal failure are high.
These four cases are all common examples of failed root canals. To ensure that the procedure is performed safely, it is important to find a root canal specialist to perform the treatment.