Tobacco Use, Attitudes, Knowledge, and Perception About Smoking Cessation Counseling Among Brazilian Dental Students: a Cross-Sectional Study.

The aim of this study was to evaluate the prevalence of tobacco use, exposure to secondhand smoke, and knowledge and perception about smoking cessation counseling among dental students in Brazil. A cross-sectional study was performed at the School of Dentistry, Universidade Federal de Pernambuco, Brazil. The Global Health Professions Student Survey (GHPSS) research instrument was used. In the second half of 2017, students from the 5th to the 10th semester were recruited to answer the anonymous and self-administered survey in classrooms. The data were tabulated and analyzed, and information about the variables was presented using descriptive statistics. The association between the variables was determined through the Chi-square test and binary logistic regression. Two hundred and twenty-four students answered the survey. More than 40% of the students had tried cigarettes at least once and 8.9% were current smokers. About 28% of the participants reported having been exposed to secondhand smoke in their home and 57.1% in other environments. Most students recognized that they are role models for society and believed they should receive training in smoking cessation counseling. However, only 12.5% of the students reported having received some formal training in this subject. In conclusion, although dental students are aware of the harmful effects of tobacco, there is still a lack of training in smoking prevention and control among these future professionals.

Myxoma of the mandibular condyle: Report of a rare case and review of the literature.

This report describes an extremely rare case of myxoma of the mandibular condyle. The tumor occurred in the left mandibular condyle of a 42-year-old woman, which was identified in a routine radiographic examination. The clinico-radiographic and histopathological features, and histogenesis of the lesion are discussed. A review of the literature and differential diagnosis of radiolucent condylar lesions are also presented.

Hallazgos imagenológicos de dens in dente tipo II con formato de odontoma dilatado en un mesiodiente / Imaging findings of a dilated odontoma shaped type II dens in dente in a mesiodens

Introduction: there are three types of dens in dente: Type I, minimal invagination confined to the crown of the tooth which does not extend beyond the amelocemental junction; Type II, invagination extends to the pulp chamber, but remains within the root canal with no communication with the periodontal ligament; and Type III, invagination extends to the root of the affected tooth, beyond the cementoenamel junction. The term dilated odontoma is used to describe the most severe variant of invagination (Type III), which is characterized by crown and/or root dilation of the affected tooth. Objective: describe a rare case of a dilated odontoma shaped dens in dente in a mesiodens and its imaging findings, diagnosed by cone beam computed tomography. Case presentation: a 14-year-old male patient was referred for radiographic examination of the mandible and maxilla to determine the cause of abnormal tooth eruption chronology. Two mesiodens were found on the maxilla. Due to the peculiar morphology of the mesiodens on the right side, cone beam computed tomography was performed. Multiplanar reconstructions revealed an oval structure on the eruption path of the upper right central incisor, in contact with its palatal surface. Coronal and sagittal reconstructions showed that invagination extended beyond the cementoenamel junction, without any additional apical/lateral formation. Conclusions: the final diagnosis was dilated odontoma shaped type II dens invaginatus in a mesiodens(AU)

Introducción: existen tres categorías de dens in dente: Tipo I, invaginación mínima confinada a la corona del diente y que no se extiende más allá de la unión amelo-cementaria; Tipo II, la invaginación se extiende a la cámara de la pulpa, pero permanece dentro del canal de la raíz, sin comunicación con el ligamento periodontal; y Tipo III, la invaginación se extiende a la raíz del diente afectado, más allá de la unión cemento-esmalte. El término odontoma dilatado se utiliza para describir la variante más grave de la invaginación (tipo III), que se caracteriza por la dilatación de la corona y/o laraíz del diente afectado. Objetivo: describir un caso raro de un dens in dente con formato de odontoma dilatado en un mesiodiente y sus hallazgos imagenológicos, diagnosticados mediante tomografía computarizada de haz cónico. Presentación del caso: paciente varón, 14 años de edad, fue enviado a un servicio de Radiología Odontológica con el fin de determinar la causa de anómala cronología de la erupción dental en maxilar superior y mandíbula. Dos mesiodientes fueron identificados en el maxilar superior. El mesiodiente del lado derecho llamó la atención debido a su peculiar morfología, por lo que se realizó la tomografía computarizada de haz cónico. Las reconstrucciones multiplanares revelaron una estructura ovalada ubicada en el trayecto de erupción del incisivo central superior derecho, en contacto con su superficie palatina. Reconstrucciones coronales y sagitales demostraron que era posible identificar la extensión de la invaginación más allá de la unión cemento-esmalte, sin constitución de forma apical/lateral accesoria. Conclusiones: el diagnóstico final fue dens invaginatus tipo II en forma de odontoma dilatado en un mesiodiente(AU)

Hallazgos imagenológicos de dens in dente tipo II con formato de odontoma dilatado en un mesiodiente / Imaging findings of a dilated odontoma shaped type II dens in dente in a mesiodens

Introduction: there are three types of dens in dente: Type I, minimal invagination confined to the crown of the tooth which does not extend beyond the amelocemental junction; Type II, invagination extends to the pulp chamber, but remains within the root canal with no communication with the periodontal ligament; and Type III, invagination extends to the root of the affected tooth, beyond the cementoenamel junction. The term dilated odontoma is used to describe the most severe variant of invagination (Type III), which is characterized by crown and/or root dilation of the affected tooth. Objective: describe a rare case of a dilated odontoma shaped dens in dente in a mesiodens and its imaging findings, diagnosed by cone beam computed tomography. Case presentation: a 14-year-old male patient was referred for radiographic examination of the mandible and maxilla to determine the cause of abnormal tooth eruption chronology. Two mesiodens were found on the maxilla. Due to the peculiar morphology of the mesiodens on the right side, cone beam computed tomography was performed. Multiplanar reconstructions revealed an oval structure on the eruption path of the upper right central incisor, in contact with its palatal surface. Coronal and sagittal reconstructions showed that invagination extended beyond the cementoenamel junction, without any additional apical/lateral formation. Conclusions: the final diagnosis was dilated odontoma shaped type II dens invaginatus in a mesiodens(AU)

Introducción: existen tres categorías de dens in dente: Tipo I, invaginación mínima confinada a la corona del diente y que no se extiende más allá de la unión amelo-cementaria; Tipo II, la invaginación se extiende a la cámara de la pulpa, pero permanece dentro del canal de la raíz, sin comunicación con el ligamento periodontal; y Tipo III, la invaginación se extiende a la raíz del diente afectado, más allá de la unión cemento-esmalte. El término odontoma dilatado se utiliza para describir la variante más grave de la invaginación (tipo III), que se caracteriza por la dilatación de la corona y/o laraíz del diente afectado. Objetivo: describir un caso raro de un dens in dente con formato de odontoma dilatado en un mesiodiente y sus hallazgos imagenológicos, diagnosticados mediante tomografía computarizada de haz cónico. Presentación del caso: paciente varón, 14 años de edad, fue enviado a un servicio de Radiología Odontológica con el fin de determinar la causa de anómala cronología de la erupción dental en maxilar superior y mandíbula. Dos mesiodientes fueron identificados en el maxilar superior. El mesiodiente del lado derecho llamó la atención debido a su peculiar morfología, por lo que se realizó la tomografía computarizada de haz cónico. Las reconstrucciones multiplanares revelaron una estructura ovalada ubicada en el trayecto de erupción del incisivo central superior derecho, en contacto con su superficie palatina. Reconstrucciones coronales y sagitales demostraron que era posible identificar la extensión de la invaginación más allá de la unión cemento-esmalte, sin constitución de forma apical/lateral accesoria. Conclusiones: el diagnóstico final fue dens invaginatus tipo II en forma de odontoma dilatado en un mesiodiente(AU)

Microbial contamination in intraoral phosphor storage plates: the dilemma.

OBJECTIVES: The aims of this study were to evaluate microbial contamination in phosphor storage plates in dental radiology services and discuss the possible origin of this contamination. MATERIALS AND METHODS: The sample comprised 50 phosphor plates: 14 plates from service A, 30 from service B, and 6 in the control group, consisting of plates never used. Damp sterile swabs were rubbed on the phosphor plates, and then transferred to tests tubes containing sterile saline solution. Serial dilutions were made, and then inoculated in triplicate on Mueller Hinton agar plates and incubated at 37 °C/48 h, before counting the colony-forming units (CFU). The samples were also seeded in brain-heart infusion medium to confirm contamination by turbidity of the culture medium. All solutions, turbid and clean, were seeded in selective and non-selective media. RESULTS: At service A and B, 50 and 73.3 % of the phosphor plates were contaminated, respectively. This contamination was mainly due to bacteria of the genus Staphylococcus. CFU counts ranged from 26.4 to 80.0 CFU/plate. CONCLUSIONS: Most of the phosphor plates evaluated shown to be contaminated, mainly by Staphylococcus ssp. Quantitatively, this contamination occurred at low levels, possibly arising from handling of the plates. The use of a second plastic barrier may have diminished contamination by microorganisms from the oral cavity. CLINICAL RELEVANCE: There is a risk of cross-contamination by phosphor storage plates used in dental radiology services.

Human identification by FSS system adapted to cephalometric radiographs.

The aim of this study was to verify the applicability and reproducibility of the FSS system [8] adapted for frontal and lateral cephalometric radiographs of the frontal sinus for human identification purposes. Eighty lateral and frontal digital cephalometric radiographs from a private Dental Radiology service's database were evaluated. Evaluations were performed in a dimmed lighting room, using a 4.200 lux lightbox with mask, ultrafan paper and pencil with a 0.5 diameter tip. The sheet of paper was superimposed on the radiograph to obtain the outlines of the frontal sinus and two examiners made the drawings independently at two different times, with a minimum period interval between evaluations. To obtain the linear physical measurements of the frontal sinus, a digital pachymeter was used. Later, all the discrete variables were codded for the statistical analysis. All variables were tested by means of the Cohen's Kappa test. The intraexaminer agreement ranged from good to perfect (p<0.001), while the interexaminer agreement ranged from regular to perfect (p<0.001). The use of frontal and lateral cephalometric radiographs was found to be reproducible and reliable for human identification by an adaptation of FSS system.

Effects of treatment with fluoxetine on mandibular development: A morphological study in rats.

AIM: To verify whether the use of fluoxetine during gestation and lactation interferes in mandibular bone formation in rats. METHODS: Twenty-four Wistar rat pups were used and distributed into four groups: CG - control of gestation; CL - control of gestation and lactation; FG - treated with fluoxetine during gestation and FL - treated with fluoxetine during gestation and lactation. At 25 days of life, after anesthesia, perfusion and decapitation, the mandibles were removed. Radiographic, histologic, histometric and polarizing microscopy analyses were performed. Statistical analysis was used considering a level of 5% significance. RESULT: The FL group compared with its control (CL) was shown to differ statistically from the other groups as regards histometry and radiopacity, revealing a reduction in the inferior cortical thickness, reduction in number of osteocytes, with consequent reduction in radiographic bone density. There was also reduction in the number of osteoblasts in FG. CONCLUSION: The long-term use of fluoxetine via oral route by pregnant and lactating rats modifies the mandibular bone mass.

Knowledge and attitudes of Brazilian dental students and dentists regarding bisphosphonate-related osteonecrosis of the jaw.

PURPOSE: The aim of this study was to evaluate the knowledge of Brazilian dentists (DEN) and dental students (DS) about bisphosphonates (BP) and bisphosphonate-related osteonecrosis of the jaw (BRONJ). METHODS: A convenience sample of 104 DEN and 100 DS was randomly selected and invited to answer a questionnaire. The questionnaire was structured on the basis of the main information about BP and the risk factors associated with the development of BRONJ. The data obtained were analyzed by the chi-square and Fisher's exact tests, considering significance of 5%. RESULTS: Seventy-five (72.1%) DEN and 75 (75%) DS did not know the BP cited in the questionnaire (p < 0.0001), and their commercial brand names were not recognized by 88 (84.6%) DEN and 86 (86%) DS (p < 0.0001). In the same way, 62 (59.6%) DEN (p = 0.04) and 58 (58%) DS (p < 0.0001) did not recognize BRONJ as an oral side effect of BP or point out oral conditions that were not associated with the use of BP. CONCLUSIONS: 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.

Ionizing radiation effects on the secretory-stage ameloblasts and enamel organic extracellular matrix.

This study assessed the effects of high doses of ionizing radiation on eruption rate, odontogenic region morphology, secretory-stage ameloblasts, and enamel organic extracellular matrix (EOECM) of rat maxillary incisors. For the study, 30 male rats were divided into three experimental groups: control (non-irradiated), irradiated by 15 Gy, and irradiated by 25 Gy. Irradiated groups received a single dose of 15 or 25 Gy of X-rays in the head and neck region. The maxillary incisor eruption rate was measured. Sections of 5-µm thickness of the maxillary incisor odontogenic regions were evaluated using bright field light microscopy. Ultrathin sections of secretory ameloblasts and their EOECM were analyzed by transmission electron microscopy (TEM). Irradiated groups showed significantly diminished eruption rate values at the 4th and at the 6th day after irradiation. Reduced optical retardation values were observed in the irradiated groups. The odontogenic region of maxillary incisors from irradiated rats exhibited altered and poorly organized preameloblasts. TEM showed degeneration areas in the secretory-stage EOECM and several autophagosomes in the secretory ameloblasts from irradiated animals. In conclusion, high radiation doses delay eruption and induce disturbances in secretory ameloblasts and EOECM of rat maxillary incisors. These findings may be associated with structural defects of mature enamel.

Lateral periodontal cyst: report of case and review of the literature.

BACKGROUND: As the lateral periodontal cyst (LPC) is an unusual odontogenic cyst, most papers are single case reports or series with a limited number of cases, with few large series. The aim of this study is to report an additional case of LPC, emphasizing the clinical, radiographic, and histopathological features, differential diagnosis, and review of 264 cases reported in the English-language literature. CASE REPORT: A 51-year-old male patient presented with a well-delimited, radiolucent, mandibular lesion, located between the roots of the right lower lateral incisor and canine and evidenced during routine radiographic examination. A surgical excision was performed. Microscopically, there was a cystic cavity lined by simple squamous epithelium, compatible with LPC. DISCUSSION: LPC is an unusual odontogenic cyst and presents a marked predilection for occurring in the mandible between the roots of canines and premolars. Accurate clinical and imaging exams should be performed for a correct approach and diagnosis.

Ossifying fibroma misdiagnosed as chronic apical periodontitis.

INTRODUCTION: Ossifying fibroma mimicking chronic apical periodontitis is extremely rare. This report describes a case of ossifying fibroma located in the periapical region of the mandibular right canine that was misdiagnosed as chronic apical periodontitis. METHODS: A 40-year-old woman complained of slight pain in the right anterior mandibular region without mucosal abnormalities or swelling. Radiographically, a well-circumscribed, unilocular, radiolucent lesion was observed that was located in the periapical region of the mandibular right canine, which presented an endodontically treated root canal. Under local anesthesia, the lesion was fully excised. RESULTS: Microscopically, there was fibrocellular connective tissue associated with a mineralized component, which consisted of lamellar or trabecular and woven bone, compatible with the diagnosis of ossifying fibroma. CONCLUSIONS: Although it is very rare, ossifying fibroma should be considered in the differential diagnosis of unusual or persistent apical radiolucencies.