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Objective:This study aimed to evaluate the possibility of any correlation between disc displacement and parameters used for evaluation of skull positioning in relation to the cervical spine: craniocervical angle, suboccipital space between C0-C1, cervical curvature and position of the hyoid bone in individuals with and without symptoms of temporomandibular dysfunction.Material and Methods:The patients were evaluated following the guidelines set forth by RDC/TMD. Evaluation was performed by magnetic resonance imaging for establishment of disc positioning in the temporomandibular joints (TMJs) of 30 volunteer patients without temporomandibular dysfunction symptoms and 30 patients with symptoms. Evaluation of skull positioning in relation to the cervical spine was performed on lateral cephalograms achieved with the individual in natural head position. Data were submitted to statistical analysis by Fisher's exact test at 5% significance level. To measure the degree of reproducibility/agreements between surveys, the kappa (K) statistics was used.Results:Significant differences were observed between C0-C1 measurement for both symptomatic (p=0.04) and asymptomatic (p=0.02). No statistical differences were observed regarding craniocervical angle, C1-C2 and hyoid bone position in relation to the TMJs with and without disc displacement. Although statistically significant difference was found in the C0-C1 space, no association between these and internal temporomandibular joint disorder can be considered.Conclusion:Based on the results observed in this study, no direct relationship could be determined between the presence of disc displacement and the variables assessed.

Bone xanthomas are rare and are usually are associated with endocrine or metabolic diseases, mainly lipid disorders. In the absence of systemic diseases, the lesion is called a primary xanthoma. Primary mandibular xanthomas are extremely rare. The aim of this report is to describe the clinical and radiographic findings of a primary mandibular xanthoma, discussing the epidemiological features, pathogenesis and differential diagnosis. A 25-year-old man was referred for evaluation of a left mandibular lesion detected in a routine radiographic exam. Radiographically, there was a diffuse, unilocular and radiolucent lesion, with irregular margins located adjacent to the surface from the distal root of the left mandibular third molar. The lesion was excised under local anaesthesia. Microscopically, there were several cells with a foamy and granular cytoplasm and central small, round nuclei, similar to xanthomatous macrophages. No lipid disorders were diagnosed. According to these features, the diagnosis of primary mandibular xanthoma was established. In conclusion, xanthomas of the jaws are rare and all seem to be primary and occur exclusively in the mandible. Dentomaxillofacial Radiology (2011) 40, 393-396. doi: 10.1259/dmfr/51850495Keywords: jaws; mandible; xanthoma Case reportA 25-year-old man was referred to a private oral surgery clinic for an evaluation of a left mandibular lesion detected in a routine radiographic exam performed during orthodontic treatment. Medical history was not contributory and the patient denied pain or previous local trauma, including surgical procedures. At the extraoral examination, the face was symmetric, with a normal contour of the inferior portion of the face. On intraoral examination, the patient showed well conserved dentition and oral mucosa with a normal colour and texture without lesions or swelling. It was noted that the patient was undergoing orthodontic treatment owing to the presence of orthodontic brackets fixed to the crown of the teeth. Radiographically, there was a diffuse, unilocular and radiolucent lesion with irregular margins, located adjacent to the surface of the distal root of the left mandibular third molar, measuring approximately 2.0 cm (Figures 1 and 2). In this region, the upper and lower limits of the mandibular canal were not observed. The left mandibular third molar was intact and no percussion pain, facial paraesthesia or paralysis or periodontal pockets in the distal surface were observed.As the lesion presented diffuse and irregular margins, and no inflammatory signs and symptoms were observed, a primary or metastatic malignant neoplasm was considered as the main hypothesis of diagnosis. To establish the diagnosis, the patient was submitted to an incisional biopsy of the lesion under local anaesthesia. During the surgical procedure, it was observed that there was no continuity between the lesion and the oral cavity. Additionally, after accessing the local area surrounding the lesion, a bone cavity filled with a yellowish, soft and amorphous tissue was n...

Objective: The aim of this study was to evaluate the clinicopathological features of oral lesions in children and adolescents diagnosed in an Oral Pathology Laboratory. Study design: Between 2000 and 2010, all oral lesions diagnosed in patients younger than 18 years old, from the Oral Pathology Laboratory, Federal University of Pernambuco, Brazil, were selected for the study. The clinical data were obtained from the patient charts filed in the Laboratory. All cases were microscopically reviewed and the diagnosis classified into 10 categories. Results: From the 2395 lesions, 315 (13.1%) occurred in this age group. The lesions were more common in the female gender (59%) during the second decade of life (69%). The inflammatory/reactive lesions were the most common (64.4%), followed by the epithelial and soft tissue neoplasms (8.6%). The mucocele (33.3%) was the most common lesion, with the lip mucosa representing the most affected site (48%). In 61.5% there was concordance between clinical hypothesis of diagnosis and histopathological diagnosis. Conclusions: Inflammatory/reactive lesions were the most common biopsied lesions and the lip the most frequent site. Similar studies are important, reinforced by the low correlation between clinical diagnosis and histopathological diagnosis. Key words:Adolescents, children, differential diagnosis, oral diseases, prevalence.

Practical initiatives, such as free lectures and workshops, must be taken to broaden the knowledge of DEN and DS about BP and thus contribute to the prevention of BRONJ.