Role of thyroid hormones in burning mouth syndrome. Systematic review

Background: Burning mouth syndrome is an idiopathic condition characterized by burning pain in a normal-appearing oral mucosa lasting at least four to six months. In the case of secondary burning mouth syndrome is associated with local or systemic factors (such as thyroid disorders) that can cause these symptoms. The aim of this review was to study the relationship between thyroid disorders and burning mouth syndrome.Material and methods: The present study followed the PRISMA guidelines. An electronic search strategy was developed for PubMed/Medline, Scopus and Cochrane. The following combination of keywords and Boolean operators were used: Thyroid AND burning mouth; Thyroid AND burning mouth syndrome; Hypothyroidism AND burning mouth; Hypothyroidism AND burning mouth syndrome; Hyperthyroidism AND burning mouth; Hyperthyroidism AND burning mouth syndrome. The results were processed by existing free software in https://www.graphpad.com/. To evaluate the association of the categorical variables we used the Fisher test at a level of significance of p-value ≤ 0,05. As a primary summary measure the Odds Ratio (OR) has been used. To analyze the risk of bias the guidelines of the GRADE guide were used and the grade of evidence was analyzed by the guide of Joanna Briggs Institute: Levels of Evidence and Grades of Recommendations.Results: After applying the inclusion and exclusion criteria, 5 studies were selected for review. The Chi-square was 10.92 and the Odds Ratio was 3.31 with respect to TSH values with p <0.0001 (Fisher's test). The population of patients with TSH alterations is increased in 80.49% and decreased in 19.51%.Conclusions: It can be concluded that thyroid hormone abnormalities are a factor in secondary burning mouth syndrome; specially in patients with hypothyroidism. (AU)

COVID-19 and oral lesions, short communication and review.

BACKGROUND: The COVID-19 disease first appeared in December 2019 in Wuhan, China. The World Health Organization (WHO) declared the pandemic in March 2020, with 40 million cases and a million deaths in October 2020. COVID-19 also includes manifestations on the skin and mucous mucosal membrane. Objective: To evaluate the prevalence of the oral lesions associated to COVID-19 disease; and evaluate their clinical presentation and the hypothesized etiology. MATERIAL AND METHODS: An electronic literature search was performed in PubMed, Scopus and Índice Médico Español databases. The following combination of keywords and Boolean operators were used: "COVID-19 AND oral manifestations"; "COVID-19 AND oral lesions"; "COVID-19 AND mucosal lesions" ; "COVID-19 AND mucosal manifestations"; "SARS-COV-2 AND oral manifestations"; "SARS-COV-2 AND oral lesions"; "SARS-COV-2 AND mucosal lesions"; "SARS-COV-2 AND mucosal manifestations". Furthermore, the bibliography was reviewed to manually include additional articles. The risk of bias in individual studies was assessed by two blinded reviewers using the Joanna Briggs Institute (JBI) and the evidence levels of the articles found will be cataloged according to the level of evidence and grade of recommendation of Oxford Centre for Evidence-Based Medicine (CEBM). RESULTS: 249 articles were found in the Medline / Pubmed database. There are no additional articles in the Scopus and Índice Médico Español databases. We selected 14 articles plus 5 more articles due to manual searching. Patients presented a wide variety of oral manifestations. The most prevalent were lesions with a solution of continuity (n = 48, 73.85%) and the most frequent area was the tongue (n = 41, 52.56%). The preferred treatment for the lesions is a localized one by using rinses. CONCLUSIONS: To conclude, after the bibliographic review was performed, we can expect that the COVID-19 disease can cause cutaneous and mucosal lesions as secondary manifestations. Despite more studies being needed to confirm this. Key words:COVID-19, SARS-COV-2, oral lesions, oral manifestations.

Clinical Efficacy of Mesenchymal Stem Cells in Bone Regeneration in Oral Implantology. Systematic Review and Meta-Analysis.

In bone regeneration, obtaining a vital bone as similar as possible to native bone is sought. This review aimed to evaluate the efficacy of stem cells in maxillary bone regeneration for implant rehabilitation and to review the different techniques for obtaining and processing these cells. A systematic review and meta-analysis were performed using the Pubmed/Medline (NCBI), Cochrane, Scielo, and Scopus databases, without restriction on the publication date. The following Mesh terms were used, combined by the Boolean operator "AND": "dental implants" AND "stem cells" AND "bioengineering". Applying inclusion and exclusion criteria, five articles were obtained and three were added after manual search. The results from the meta-analysis (18 patients) did not provide significant differences despite the percentage of bone formed in the maxillary sinus, favoring the stem cell group, and the analysis of the percentage of residual Bio-Oss® showed results favoring the control group. Stem cell regeneration usually shows positive vascular and viable bone formation. In conclusion, using mesenchymal stem cells in bone regeneration provides benefits in the quality of bone, similar or even superior to autologous bone, all this through a minimally invasive procedure.