Root canal therapy is the treatment of pulp periapical disease

Root canal treatment is one of the main methods of treatment of dental pulp periapical disease, so people are very concerned about the efficacy of root canal treatment. Many cases in strict accordance with the treatment operation, but still fails, the reason can be summed up roughly the following aspects:

1. Anatomical factors

Collateral, vice root canal root canal, apical bifurcation, the apical bifurcation.

2. Iatrogenic factors

1. Root canal wall side wears. 2. Apical super-charge. The overfilled failure is mainly due to a root canal or root canal infection. In many cases, super-charge of the apical seal is not fully penetrate into the root canal of the tissue fluid rich in glycoprotein can give residual bacteria provide nutrition to allow bacteria to grow and reach a certain number of induced periapical recurrence. Closed state of the crown regurgitation is one of the important reasons for the failure of root canal treatment. In some cases, even after root canal filling can be re-contaminated, such as temporary or dental instruments permanent filling of the fracture, not time for a permanent repair, the bacteria can invade and colonization in the root canal system, resulting in root canal treatment failure. 3. Paper points, cotton twist legacy. Root canal open.

3. Microbial factors

1. Infection within the root canal mechanical preparation, the currently used chemical preparation, drug disinfection, etc. can not be completely disinfecting the entire root canal system. Especially the remnants of the root canal isthmus, furcation collateral root canal and dentinal tubules in the bacteria, plus if the root canal does not close together, penetrate the tissue fluid can be to provide nutrition for the bacteria. When the bacteria reach a certain number, but also cause periapical destruction. With untreated root canal, fewer types of bacteria in the root canal treatment failure of the root canal system of G bacteria, but also significantly reduced the number of anaerobic and aerobic bacteria, these bacteria include: manure chain bacteria, Enterococcus facials. 2. The development of the root canal infection periapical damage in the human body to form a barrier to prevent bacteria from further expansion. Macrophages, antibodies, complement the formation of a dense protective barrier at the apical, thus preventing the bacteria into the periapical tissue. Most of the root canal bacteria in Now popular porcelain teeth clinically can not pass this barrier, now known that some bacteria such as: through this barrier, survive in the periapical tissue infection. These bacteria evade the host defense mechanisms, mainly through the biofilms structure, resulting in pathogenic role.

4. Non-bacterial factors

Some refractory cases biopsy: periapical tissue there are a large number of cholesterol crystals can not be cleared, such as macrophages, may also lead to root canal treatment failure.