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Journal of Oral Science & Rehabilitation 52 Volume 2 | Issue 2/2016 S p o n t a n e o u s b o n e r e g e n e r a t i o n : A n a l y s i s o f 3 3 6 c a s e s Figs. 1 & 2 Figs. 3 & 4 Fig. 1 Preoperative radiographic view (2005). Fig. 2 Preoperative CT scan view (2005). Fig. 3 Preoperative clinical view. Fig. 4 The surgery was performed under local anesthesia to obtain a larger working area. Allofthepatientswerefollowedforpossiblecom- plications, including hemorrhagic complications, swelling,hematomaandecchymosis.Follow-ups entailedbothclinicalandradiographicevaluations in order to assess the reduction in size of the re- sidual cavities. Clinical controls were performed ten days after surgery and radiographic assess- ment after 30 days and at six and 12 months postoperatively. The radiographic examinations, performed in order to evaluate the bone regen- eration rate, entailed preoperative and postoper- ative panoramic radiographs and, in some cases, CT scans (Figs. 8 & 9). A CT dental scan was re- quiredinordertoevaluatemorepreciselytherate of bone healing in the buccolingual dimension, using axial slices, if necessary. The findings from the panoramic radiographs were analyzed both subjectively and using the Kawai et al. radio- graphic classification, which evaluates the vari- ation ofthe surgical site margins and the interior contents of the sites based on radiographs.21 Results The sample included 336 patients, 200 males (59.5%) and 136 females (40.5%) ranging from 10 to 83 years of age (mean age and standard deviation of 43.4 ± 16.8), as demonstrated in Table 1. No patients were lost during follow-up. The majority (68.8%) of the patients had man- dibular cysts and the remainder of the sample (31.3%) had maxillary lesions. S u r g i c a l a n d r a d i o g r a p h i c d a t a The mean dimensions of the bony defects were 1.50 ± 0.80 × 1.06 ± 0.50 cm. Primary closure was obtained in all of the cases. Minor compli- cations (swelling, hematoma and ecchymosis were present in 85% ofthe cases)were reported during the first week. At the second recall, these minor complications were no longer present. No hemorrhagic complications occurred.An inferior alveolarnerve paresthesia and a compoundfrac- ture both occurred in only one patient (0.3%). S p o n t a n e o u s b o n e r e g e n e r a t i o n : A n a l y s i s o f 336 c a s e s