| In this investigation 20 teeth with periapical lesions were treated. |
| Individualized radiographic exam consisting of posterior bitewings with panoramic exam or posterior bitewings and selected periapical images. |
| 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. |
| Contact with periapical tissue may occur in the event of accidental overfilling. |
| If the root canals were properly sealed, no negative reactions of the periapical tissue were observed. |
