Position of the mandibular canal before and after bilateral sagittal split ramus osteotomy: a cone beam computed tomographic study.

The aim of this study was to evaluate the position of the mandibular canal (MC) before and after bilateral sagittal split ramus osteotomy (BSSRO) using cone-beam computed tomography (CT), and to compare the position of the MC in Class II and Class III patients in the preoperative period. Patients were divided into two groups: Class II (n = 38) and Class III (n = 41). Measurements of the superior, inferior, buccal, and lingual distances of the MC in relation to the cortical bone were taken at three levels in the proximal segment of the mandible. Results were analysed using the Kruskal-Wallis test (p < 0.05). In the Class II group the superior distance of the MC at levels 2 and 3, and the inferior distance at level 3 significantly decreased after BSSRO. In the Class III group, no significant differences were found at any level, and the inferior distances at all levels were smaller preoperatively than those in the Class II group. In the Class II group the position of the MC altered in relation to superior and inferior cortical bone after BSSRO. However, the position of the MC remained stable in the Class III group. Our results also suggest a deeper cut in inferior cortical bone in Class III patients.

Temporal bone pneumatization in patients with dentofacial deformities: cone beam computed tomography study.

Pneumatization in the osseous components of the temporomandibular joint (TMJ) may represent a complicating factor in TMJ surgery. This study determined the prevalence and characteristics of pneumatized articular eminence (PAE) and pneumatized glenoid fossa (PGF) using cone beam computed tomography (CBCT) scans of patients with and without dentofacial deformities. The CBCT of 587 asymptomatic patients (216 class I, 179 class II, 192 class III) were assessed to determine PAE and PGF. Age, sex, laterality, and type (uni/multilocular) of pneumatization were recorded. Differences were tested using the χ2 test and binary logistic regression models (P<0.05). Overall, 63.7% of patients presented some pneumatization: 15.5% presented both PAE and PGF, 0.9% presented only PAE, and 47.4% presented only PGF. The multilocular type was more frequent in both PAE and PGF (P<0.001). There was a significant difference regarding dentofacial deformity for PAE (P=0.021), with a higher frequency in class I. There were no differences according to sex, age, or laterality. The absence or lower frequency of pneumatization in class II and III patients may indicate continuous remodelling of the joint, which is submitted to abnormal occlusion forces. This knowledge is helpful for TMJ surgery planning, particularly as patients with dentofacial abnormalities may more often be candidates for TMJ surgery.

Linfoma no hodgkin de células de manto: relato de caso raro y la presentación a los profesionales de la salud de la importancia de un diagnóstico precoz / Lymphoma, mantle cell lymphoma: case report and presentation weird to health professionals of the importance of early diagnosis

Después del carcinoma epidermoide, los linfomas representan el segundo grupo de neoplasias que comprometen la región de la cabeza y cuello, la exploración de este tema es importante en función de la elevada incidencia en los últimos años especialmente los linfomas no Hodgkin. Este linfoma se puede presentar en la región de cabeza y cuello de diversas formas, con compromiso ganglionar y/o extraganglionar, el sitio más común en la región de cabeza y cuello, es el anillo de Waldeyer, seguido por la órbita y anexos, senos paranasales, glándulas salivales, cavidad bucal, laringe y tiroides. En el siguiente trabajo vamos a presentar un caso clínico y en el abordar la necesidad de el conocimiento de el odontólogo-cirujano y demás profesionales de la salud sobre la lesión, con el fin de posibilitar un diagnostico precoz, contribuyendo para un mejor pronostico, prolongar tiempo de vida y mejorar la calidad de vida para este paciente

After the squamous cell carcinoma, lymphomas represent the second group of neoplasms of the head and neck region. Explore this issue proved to be important because the increase of incidence in recent years, especially non-Hodgkin lymphomas. This lymphoma can occur in the head and neck in different ways, with nodal involvement and / or extranodal. When the extranodal site most common in head and neck is the ring of Waldeyer, followed by orbit and attachments, paranasal sinuses, salivary glands, oral cavity, larynx and thyroid. This study sought to present a case report and address the need for knowledge of the dentists and other health professionals about the injury, so that they can make the diagnosis earlier and thus could contribute to a better prognosis, longer survival and better quality of life for this patient

Carbon and nitrogen isotopic compositions of alkyl porphyrins from the Triassic Serpiano oil shale.

The carbon and nitrogen isotopic compositions of seven of the most abundant alkylporphyrins from the Serpiano oil shale (marine, Triassic) were determined. For the C31 and C32 butanoporphyrins, values of delta 13CPDB and delta 15NAIR averaged -24.0% and -3.1%. In contrast, the C31 and C32 methylpropanoporphyrins, DPEP, and a C30 13-nor etioporphyrin had delta 13C and delta 15N values averaging -27.5 and -3.3%, respectively. Carbon and nitrogen isotopic values for kerogen averaged -30.8 and -0.9, whereas those for total extract averaged -31.6, and -4.0%. The butanoporphyrins apparently derive from a biological source different from that giving rise to the other porphyrins, their 13C enrichment not being related to carbon isotopic fractionation accompanying diagenetic reactions. The delta 15N values for all the porphyrins indicate that the depletion of 15N observed in the kerogen is of primary origin. Consistent with the very high abundance of hopanoids and methyl hopanoids in the aliphatic hydrocarbon fraction, it is suggested that cyanobacterial fixation of N2 may have been the main cause of 15N depletion.