Pixel gray measurement for the diagnosis of dental ankylosis in cone beam computed tomography images.

Objective: The aim of this study was to investigate dental ankylosis in unerupted or partially erupted teeth by using cone beam computed tomography (CBCT) to quantify pixel intensity.

Study Design: In total, 157 CBCT images from individuals with a total of 206 unerupted or partially erupted teeth with suspected ankylosis were evaluated. CBCT images were analyzed for the presence of ankylosis by 2 oral radiologists by quantifying mean pixel intensities (analysis 1) and variations in pixel intensities (analysis 2) in normal and ankylosed regions.

Primary Extracranial Meningioma: A Rare Location.

Meningiomas are benign extraaxial tumors of the central nervous system (CNS). Extracranial meningiomas are extremely rare (2%) and can develop as a direct extension from a primary intracranial meningioma or as true primary extracranial meningioma originating from ectopic arachnoid cells. Only eight cases of primary meningioma in the jaw have been reported to date.

Pre-heating mitigates composite degradation.

Dental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives This study evaluated the effect of pre-heating on the degradation of composites, based on the analysis of radiopacity and silver penetration using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS). Material and Methods Thirty specimens were fabricated using a metallic matrix (2x8 mm) and the composites Durafill VS (Heraeus Kulzer), Z-250 (3M/ESPE), and Z-350 (3M/ESPE), cured at 25°C (no pre-heating) or 60°C (pre-heating).

Glucocorticoids, calcitonin, and osteocalcin cannot differentiate between aggressive and nonaggressive central giant cell lesions of the jaws.

Objective: To evaluate the expression of glucocorticoid receptor (GR), calcitonin receptor (CTR), and osteocalcin (OC) in aggressive and nonaggressive central giant cell lesions (CGCLs). The numbers of mitotic and multinucleated giant cells were also evaluated.

Study Design: Thirty-one cases of CGCL were submitted for immunohistochemistry.

Occurrence of maxillary sinus abnormalities detected by cone beam CT in asymptomatic patients.

Background: Although cone beam computed tomography (CBCT) images of the maxillofacial region allow the inspection of the entire volume of the maxillary sinus (MS), identifying anatomic variations and abnormalities in the image volume, this is frequently neglected by oral radiologists when interpreting images of areas at a distance from the dentoalveolar region, such as the full anatomical aspect of the MS. The aim of this study was to investigate maxillary sinus abnormalities in asymptomatic patients by using CBCT.

Methods: 1113 CBCT were evaluated by two examiners and identification of abnormalities, the presence of periapical lesions and proximity to the lower sinus wall were recorded.

High-grade primary leiomyosarcoma in the mandible: diagnosis and treatment.

Background: Leiomyosarcoma is a malignant tumor that originates in smooth muscle cells and is rarely found in the oral cavity. We present a case of high-grade primary leiomyosarcoma in the mandible and discuss the diagnosis process.

Methods: The patient was a 64-year-old white man who had a slight increase in volume in the left-side mandible with a radiolucent osteolytic image with the destruction of the mandibular cortex.

Importance of cone beam computed tomography for diagnosis of calcifying cystic odontogenic tumour associated to odontoma. Report of a case.

The calcifying cystic odontogenic tumour (CCOT) is a rare benign cystic neoplasm not infrequently associated with odontoma. This report documents a case of CCOT associated with compound odontoma arising in the anterior maxilla in a 25-year-old woman. Conventional radiographs showed a large calcified mass with poorly visualized radiolucent margins.