Background: The purpose of this cross-sectional study was to evaluate radiologically, the relation between the distance from the cementoenamel junction (CEJ) to the facial bone crest (FBC), and the facial alveolar bone (FAB) width at maxillary anterior teeth. A further aim was to assess if the CEJ-FBC distance had an impact in the prevalence to find a FAB thickness greater than one mm. Study design: CBCT images were retrospectively obtained from the database of the Oral Surgery Unit of the University of Valencia. The teeth were divided in 3 groups according to the CEJ-FBC distance: Shorter (≤3mm), Middle (>3 ≤4.5 mm) and Larger (>4.5 mm). FAB thickness was measured by two different examiners at 1, 2 and 3 mm apical to the FBC. Normality of means were evaluated by Kolmogorov-Smirnov test and an ANOVA-type linear model was performed. Results: 82 patients were included in the study, with 156 central incisors, 149 lateral incisors and 152 canines analyzed. A significant greater FAB thickness in Shorter (≤3mm CEJ-FBC) than Middle and Larger group was observed in all distances measured apical to the FBC. There was a significant inverse relation between the distance CEJ-FBC and FAB thickness at all distances measured. The prevalence of a FAB thickness equal or greater than one mm was 35.9% of all teeth analyzed from Shorter, 17.4% of Middle and 8.9% of Larger group at 1 mm apical to the FBC. Rojo-Sanchis J, Peñarrocha-Oltra D, Peñarrocha-Diago M, Zaragozí-Alonso R, Viña-Almunia J. Relation between the distance from the cementoenamel junction to the bone crest and the thickness of the facial bone in anterior maxillary teeth: A cross-sectional tomographic study. Med Oral Patol Oral Cir Bucal. 2019 May 1;24 (3):e409-15.

Background Tobacco, alcohol consumption, and HPV infection are the most common risk factors for head and neck cancer (HNC). Despite of this, recent evidences are growing on the association between long-term exposure to pesticides and the risk of chronic diseases, including different types of cancer. The present review evaluated in current literature evidence of an association between exposure to pesticides and the occurrence of HNCs. Material and Methods A literature search of the case-control studies was conducted in the PubMed, Web of science and Cochrane databases. Methodological quality of each study was rated with the Scottish Intercollegiate Guidelines Network (SIGN 50) checklist. Results One thousand and thirty-five studies were identified and twelve met all criteria and, therefore, considered for quality assessment and data extraction. According to SIGN 50 criteria, six studies received an overall high-quality. All the studies considered of high quality found a positive association between exposure to pesticides and different HNC sites, including larynx, pharynx and nasal cavity. In addition, the increased risk was associated with the frequency of exposure. Conclusions Finally, improving pesticide users' awareness of their risks and proper handling, as well as adopting protective measures such as the use of personal protective equipment, appear to be effective in reducing human health damage. Key words: Case control studies, head and neck cancer, pesticides, review, risk factors.

Background This study aimed to evaluate the perception of self-regulated learning of Brazilian undergraduate dental students during the COVID-19 pandemic. Material and Methods A nationwide cross-sectional survey was conducted. Data were collected in 2020, through an anonymous self-administered virtual questionnaire, which comprised an initial section related to the students’ sociodemographic data, category of educational institution where they enrolled, and the possible impacts of COVID-19 pandemic on family income, teaching activities (maintained remotely or totally suspended), and self-perception of academic performance during e-learning. The second part comprising 31 questions related to the adapted Self-Regulated Learning Perception Scale (SRLPS). For statistical analysis, Student’s t-test of independent samples, Kruskal-Wallis, and Mann-Whitney U test were used, considering a significance of 5%. Results From 779 students, 425 (54.6%) reported distance learning activities during the pandemic, and 354 (45.4%) experienced complete interruption of teaching activities. Students with good performance during e-learning were more skilled in self-regulated learning when compared to those who reported regular ( p = 0.026), bad ( p = 0.000), and very bad ( p = 0.000) performance. In addition, students who stated a good performance during e-learning were more skilled in self-regulated learning than those with fully suspended teaching activities ( p = 0.000). Conclusions E-learning performance of undergraduate dental students during COVID-19 pandemic influenced the self-regulated learning perception. In addition, the pandemic negatively impacted the self-regulated learning of students who experimented full suspension of teaching activities. Changes in family’s income did not affect their self-regulated learning. Key words: Dental education, community health, e-learning, learning, pandemics.

Background Several nonendodontic diseases can occur in the periapical region, resembling endodontic inflammatory conditions. Therefore, the aim of the present study was to determine the frequency of nonendodontic periapical lesions diagnosed in a Brazilian population. Material and Methods The files of two Oral Pathology laboratories were reviewed and all cases including at least one clinical diagnosis of endodontic periapical lesions were selected for the study. After initial selection, demographic and clinical data, clinical diagnosis and final diagnosis were reviewed and tabulated. Final diagnosis included endodontic periapical lesions, and benign and malignant nonendodontic periapical lesions. Data were descriptively and comparatively analyzed among the three groups, with a significance level of 5% ( p <0.05). Results Nonendodontic periapical lesions were identified in 208 (19%) out of the 1.125 registries included in the final sample. Benign nonendodontic periapical lesions (200 cases, 18%) were mostly odontogenic keratocysts, ameloblastomas, nasopalatine cysts, dentigerous cysts, glandular odontogenic cysts, and benign fibroosseous lesions. Malignant nonendodontic periapical lesions (8 cases, 1%) included carcinomas, adenocarcinomas, and melanoma. In general, nonendodontic periapical lesions were more common in males and in the posterior mandible ( p >0.05). Conclusions The frequency of nonendodontic periapical lesions was high and, although the general distribution was similar to the results from other populations, some features were probably associated with the profile of the studied populations and to the methods applied in the present study. Knowledge on differential diagnosis of endodontic and nonendodontic periapical lesions is essential to avoid unnecessary treatments and diagnostic delay in routine dental practice. Key words: Differential diagnosis, nonendodontic, periapical lesion, pulp necrosis.