Evaluation of bone availability for grafts in different donor sites, through computed tomography Objective: To quantify the bone volume that can be safely withdrawn from 3 donor sites: (1) the mandibular symphysis, (2) the oblique mandibular line and (3) the skullcap. Methodology: For the symphysis, 200 tomographic exams were evaluated by the extension of the anterior loop of mental foramen, by the nerve, by the distance of the foramens, by the distance between the vestibular cortical and the lingual plates and by the distance between the apexes, or lower anterior teeth, and the mandibular base, using the "distance" tool of the I-CAT Vision, in the panoramic and parasagittal reformations. For the oblique line, 70 TCFC exams were analyzed retrospectively in panoramic and parasagittal reformations, evaluating the thickness of the vestibular cortical and the distance between the cortical and the mandibular canal.For the cranial bone, a hexagonal donor site located in parietal area was considered. Results: The average dimensions of the bone blocks that can be safely removed from the region of the mandibular symphysis are: 32.27 mm in length, 4.87 mm in height and 4 mm in thickness, providing a volume of 628.61 mm 3 available for grafting. In the oblique line, the available bone volume for grafting was 859.61 mm 3 . In the region of the cranial vault, multiplying the average bone thickness by the area of the hexagon, an average volume of 2,499 mm 3 was obtained. Conclusions: Comparing the donor sites, the bone availability in the cranial vault is 3 times greater than in the mandibular posterior region, and at least 2 times greater than in the mandibular symphysis.

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r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 6;5 7(2):112-115 Cone beam computed tomography Anatomy Anatomic variation a b s t r a c t It has been related that only 7% of MCs are in contact with the mandible buccal cortex. This case report illustrates one mandibular canal with an atypical trajectory with fenestration at the buccal mandible cortex through a cone beam computed tomography exam from a 45 years old, Caucasian female patient, through ICat Vision ® (Imaging Science International, Hatfield, PA) and InVivo software (Dental Anatomage, Version 5.1.10). This anatomic variation was not observed in the left side. Preoperative planning should consider a well-recommended cone beam computed tomography, which will allow identification of trajectory variations that are not visualized in panoramic radiographs. Caso raro de fenestração bucal do nervo alveolar inferior Palavras-chave: Mandíbula Tomografia computadorizada de feixe cónico Anatomia Variação anatómica r e s u m o São descritos que apenas 7% dos MC estão em contato com o cortical bucal mandibular. Este relato de caso ilustra um canal mandibular com trajetória atípica e fenestração na cortical bucal da mandíbula, através de um exame de tomografia computadorizada de feixe cónico em paciente, mulher, 45 anos de idade, leucoderma, obtido por ICAT Vision ® (Imaging Science International, Hatfield, PA) e software InVivo (Dental Anatomage, versão 5.1.10). Esta variação anatómica não foi observada no lado esquerdo. O planeamento pré-operatório deve considerar a indicação da tomografia computadorizada de feixe cônico, o que irá permitir a identificação de variaç ões de trajetória que não são visualizadas em radiografias panorâmicas.

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