The accuracy of vertical and horizontal measurements, using CBCT (i-CAT) for the four protocols, was shown to be comparable with the measurements performed on the dry mandible.

The canalis sinuosus (CS) is a neurovascular canal, a branch of the infraorbital canal through which the anterior superior alveolar nerve passes. There are no studies or case reports of anatomical variations related to this canal. A rare case of anatomical variation in the CS is reported that was detected by cone beam computed tomography done in a 47-year-old female as a pre-operative workup before dental implants. In this case, in the region slightly medial to tooth 23, a wide accessory branch from the CS was observed, running an intraosseous course in the inferior and posterior direction up to a foramen located in the hard palate, slightly medial in relation to tooth 23. The location of this branching, as well as its neurovascular component, is important for dental implant planning because of its proximity to the upper teeth. Identification of neurovascular bundles is fundamental to avoid complications for the patient.

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The mental foramen is a bilateral opening in the vestibular portion of the mandible through which nerve endings, such as the mental nerve, emerge. In general, the mental foramen is located between the lower premolars. This region is a common area for the placement of dental implants. It is very important to identify anatomical variations in presurgical imaging exams since damage to neurovascular bundles may have a direct influence on treatment success. In the hemimandible, the mental foramen normally appears as a single structure, but there are some rare reports on the presence and number of anatomical variations; these variations may include accessory foramina. The present report describes the presence of accessory mental foramina in the right mandible, as detected by cone-beam computed tomography before dental implant placement.

Hybrid lesions comprise elements of different pathologies in one lesion. Hybrid lesions comprising central giant cell granulomas (CGCG) with fibro-osseous components are rare, with only six maxillomandibular cases reported in the literature. We report a case of a hybrid lesion in a 38-year-old woman who presented with a swelling in the mandibular parasymphysis, on the left side. Panoramic and occlusal radiographs and CT showed a mixed lesion with expansion of the buccal cortical plate that pointed to the diagnosis of ossifying fibroma (OF). Complete excision of the lesion was performed, and the anatomopathological examination showed features of both CGCG and a fibro-osseous lesion. Clinical, imaging and histopathological features indicate a hybrid lesion of CGCG and OF. The patient remains asymptomatic after 30 months of follow-up.

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