If I were you I would seek medical attention (not dental) ASAP. Radiated bone is chemically different from normal bone and remains so throughout your life.
You know the drill. You may need oxygen saturation therapy to prevent mandibular necrosis.
Darrell

Stage 3, T3,N1,M0,SCC, Base of Tongue. No Surgery, Radiationx39, Chemo, Taxol & Carboplatin Weekly 8 Treatments 2004. Age 60. Recurrence 2/06, SCC, Chest & Neck (Sub clavean), Remission 8/06. Recurrence SCC 12/10/06 Chest.