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Background Light-cured resins are widely used as gingival barriers to protect the gums from highly concentrated peroxides used in tooth bleaching. The impact of barrier brand on clinical outcomes is typically considered negligible. However, there is limited evidence on the effects of different brands on operator experience, barrier adaptation, and patient comfort. Objective This clinical trial assessed the impact of four commercial gingival barrier brands (Opaldam, Topdam, Lysadam, and Maxdam) on operator perception, adaptation quality, and patient comfort. Methods Twenty-one undergraduate students placed gingival barriers in a randomized sequence using blinded syringes. Photographs of the barriers were taken from frontal and incisal perspectives. After bleaching procedures, operators rated handling features and safety using Likert scale forms. Two experienced evaluators independently assessed barrier adaptation quality on a scale from 1 (perfect) to 5 (unacceptable). The absolute risk of barrier-induced discomfort was recorded. Data were analyzed using Friedman and Chi-square tests (α = 0.05). Results Opaldam and Topdam received the highest scores in most handling features, except for removal, which was similar among all brands. No significant difference was observed in barrier adaptation quality between the evaluated brands. Discomforts were mainly reported in the upper dental arch, with Maxdam having the highest absolute risk (35% for this arch and 24% overall). Conclusions This study suggests that gingival barrier brands can influence operator perception and patient comfort. Opaldam and Topdam were preferred by operators, but all brands demonstrated comparable adaptation quality. Clinical trial registration The study was nested in a randomized clinical trial registered in the Brazilian Clinical Trials Registry under identification number RBR-9gtr9sc.

Background Geographic Tongue (GT) is a benign inflammatory disorder of unknown etiology, which is characterized by the loss of epithelium due to the atrophy of filiform papillae. It usually occurs on the dorsum of the tongue and may extend to its lateral edges. It appears as an erythematous area surrounded by whitish and slightly elevated margins. In most cases, the condition is asymptomatic , although some individuals may report symptoms that include a burning sensation of the tongue. Objective Assess whether there was a change in the clinical aspect of Geographic Tongue (GT) during the COVID-19 pandemic. Methods Thirty-two participants were recruited from Dentistry School Universidade Federal Fluminense. Anamnesis and oral examination were performed to collect medical history. The participants were split into two groups: control group (no GT) n = 20 and test group (with GT) n = 12. In the second step, nine participants from a 12 (75%) of the test group were contacted by phone and answered a questionnaire about changes in the signs and symptoms of GT during the pandemic. The subjects were subdivided into two groups: GT with and without signs and symptoms exacerbation. Results In the first phase of the research, no statistical difference between control and test groups was observed regarding clinical criteria such as age (p + 0.72), gender ( p  = 0.24), and systemic diseases ( p  = 0.58). In the second phase, there was a statistical difference between GT groups with or without symptom exacerbation in terms of age and stress as a factor of the oral symptoms ( p  = 0.3 and 0.2), respectively. Younger patients showed a worsening of the oral lesions related to GT ( p  = 0.3) and reported stress during the pandemic ( p  = 0.02). Conclusion Younger patients were more susceptible to stress and presented more exacerbation of the oral lesions related to GT.

The use of fluoride dentifrices has contributed to a worldwide reduction in the incidence of dental caries. This study evaluated the dentifrices available on the Brazilian market regarding their fluoride content, concentration and registration status with the Brazilian National Health Surveillance Agency (Anvisa). Dentifrices were obtained from the Internet, pharmacies, and supermarkets. Anvisa registrations were verified through a search of the agency´s official website. All adult and children's dentifrices available in the Brazilian market were included in the search. Relevant information, such as product name, brand, presence, and fluoride concentration, was gathered from manufacturers' websites, sales websites, and product packaging (including leaflets). This data was systematically recorded for analysis. The data obtained were analyzed statistically using the chi-square test. Two hundred sixty dentifrices were identified in the Brazilian market during the research period from 2020 to 2023. Of these, 71.9% contained fluoride, 25.8% did not, and 2.3% did not provide any information regarding the presence or absence of fluoride. Among the fluoride dentifrices, 69.5% had at least 1000 ppm, the concentration recommended by the World Health Organization for an anti-caries effect. Additionally, 6.4% had lower fluoride concentrations, and 24.1% provided no information about fluoride concentration. Overall, 74.2% of the dentifrices were registered with Anvisa, while 25.8% did not present any registration. According to the fluoride concentrations provided by the manufacturers, only half of the dentifrices available on the Brazilian market contain at least 1000 ppm, the recommended concentration for effective caries prevention. The percentage of dentifrices that did not disclose fluoride concentration was significantly higher among those not registered with Anvisa. The large number of dentifrices that do not meet the recommended minimum fluoride concentrations undermines preventive measures for oral health promotion. It may increase the population's vulnerability to developing dental caries.

Purpose: to evaluate the shrinkage, polymerization stress, elastic and bulk modulus resulting from composites formulated by siloranes, 2 nd generation ormocers, and dimethacrylates. Materials and Methods: The bonded disc method was used to evaluate volumetric shrinkage. The polymerization stress was evaluated by mean of the Bioman. Cylindrical specimens (5 mm thickness and 6 mm diameter) were submitted to gradual loading. Young's and bulk modulus were obtained from the slope of the stress/strain curve. Data were analyzed using one-way analysis of variance and Tukey's test (5%). Results: Grandio and ormocer showed significant higher elastic and bulk modulus. Silorane presented significant lowest bulk modulus and maximum shrinkage. Ormocer and silorane presented lower values for the maximum rate of shrinkage. Extra-low shrinkage (ELS) composite presented the greatest maximum shrinkage. The higher maximum rate of shrinkage was attained by Grandio and ELS, statistically similar from each other. The silorane showed lower values of maximum stress and maximum rate of stress. The higher values of maximum stress were presented by ELS and Grandio, statistical similar between them. Grandio showed the significantly greatest maximum rate of stress. Conclusion: Silorane showed to promote lower shrinkage/stress among the composites, with the lowest elastic modulus. Ormocer showed lower shrinkage/stress than methacrylates despite of its high modulus.