| Root canal irrigation carries a risk of extrusion of irrigant into the periapical tissues. |
| Teeth number 17 and 16 were restorable, but 26 and 27 were grossly carious with associated buccal swelling and the diagnosis was periapical periodontitis. |
| The new analysis, published in the September issue of the Journal of Endodontics, focused on patients who had to be hospitalized because of an infection of the tip of the tooth's root, called a periapical abscess. |
| Microorganisms and their products play a fundamental role in the pathogenesis of the pulp and periapical infections. |
| In this investigation 20 teeth with periapical lesions were treated. |
| If the root canals were properly sealed, no negative reactions of the periapical tissue were observed. |
