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Abstract Considering the unfavorable implications of health falsehoods and the lack of dental research into information disorder, this study aimed to identify and characterize online oral health misinformation. A total of 410 websites published in English were retrieved using Google Advanced Search and screened by two independent investigators to compile falsehoods through thematic content analysis. Afterward, 318 pieces of misinformation were consensually divided into four groups concerning their informational interest (G1), financial, psychological, and social interests produced/disseminated by non-dental professionals (G2) or by dental professionals (G3), and political interests (G4). Social media (Facebook and Instagram) and fact-checking tool (Snopes) were also screened to determine the spread of falsehoods by identifying corresponding posts and warnings. As a result, misinformation was mainly associated with gum diseases (12.0%), root canal treatment (11.6%), toothache (10.4%), fluoride (10.4%), and dental caries (9.8%), with a special highlight on recommendations for the usage of natural products, toxicity concerns, and anti-fluoridation propaganda. Additionally, most misinformation was allocated in G3 (41.9%), which presented a statistically higher frequency of financial interests than G4. Finally, falsehoods were considerably identified on Facebook (62.9%) and Instagram (49.4%), especially G3 and G4. Nevertheless, Snopes has debunked only 5.9% of these content items. Therefore, misinformation was predominantly produced or disseminated by dental professionals mainly motivated by financial interests and usually linked to alternative/natural treatments. Although these items were shared on social media, fact-checking agencies seemed to have limited knowledge about their dissemination. disorder 41 analysis Afterward 31 G1, G1 G , (G1) psychological produceddisseminated nondental non G2 (G2 G3, (G3) G4 . (G4) factchecking fact checking (Snopes warnings result 12.0%, 120 12.0% 12 0 (12.0%) 11.6%, 116 11.6% 11 6 (11.6%) 10.4%, 104 10.4% 10 4 (10.4%) 9.8%, 98 9.8% 9 8 (9.8%) products concerns antifluoridation anti fluoridation propaganda Additionally 41.9%, 419 41.9% (41.9%) Finally 62.9% 629 62 (62.9% 49.4%, 494 49.4% 49 (49.4%) Nevertheless 59 5 5.9 Therefore alternativenatural alternative treatments dissemination 3 (G1 (G (G3 (G4 12.0 1 (12.0% 11.6 (11.6% 10.4 (10.4% 9.8 (9.8% 41.9 (41.9% 62.9 (62.9 49.4 (49.4% 5. 12. (12.0 11. (11.6 10. (10.4 9. (9.8 41. (41.9 62. (62. 49. (49.4 (12. (11. (10. (9. (41. (62 (49. (12 (11 (10 (9 (41 (6 (49 (1 ( (4