Efeito da irradiação laser associada à aplicação tópica de fluoreto sobre o esmalte submetido à erosão e/ou abrasão / Effect of laser irradiation associated with topic application of fluoride on sound enamel submetted to erosion and/or abrasion

A aplicação do laser sobre o esmalte associada ou não a aplicação tópica de fluoreto têm demonstrado aumentar sua resistência à ação de ácidos. O presente estudo teve como objetivo avaliar o efeito da irradiação laser de alta potência associada à aplicação de fluoretos sobre o esmalte dentário submetido à erosão e/ou abrasão dentária. Para tal, 184 blocos de esmalte foram selecionados pela microdureza de superfície (SMH inicial) e foram divididos em 8 grupos com 23 espécimes cada (3 foram utilizados para realização da biópsia básica da superfície de esmalte dentário, 10 foram submetidos à erosão e os outros 10 à erosão associada à abrasão): G1- sem tratamento (controle); G2- tratamento com flúor fosfato acidulado (1,23% F) por 4 min; G3- verniz fluoretado; G4- irradiação com laser Nd:YAG (56,6 J/cm2); G5- aplicação de flúor fosfato acidulado e posterior irradiação com laser Nd:YAG (56,6 J/cm2); G6- aplicação de flúor fosfato acidulado e prévia irradiação com laser Nd:YAG (56,6 J/cm2); G7- aplicação de verniz fluoretado e posterior irradiação com laser Nd:YAG (56,6 J/cm2); G8- aplicação de verniz fluoretado e prévia irradiação com laser Nd:YAG (56,6 J/cm2). Após os tratamentos, os blocos submetidos à ciclagem erosiva sofreram 4 imersões diárias em bebida ácida com pH 2,6, 0,32 ppm F (Coca-Cola Company, Spal, Porto Real, RJ, Brasil), por 2 min, seguida pela imersão em solução remineralizadora por 2 h, durante 5 dias. Nos blocos submetidos à erosão associada à abrasão, uma vez ao dia após cada ciclo, os espécimes foram submetidos à abrasão com 40 ciclos de escovação simulada com força de 2,5 N. Os blocos de esmalte foram avaliados por meio da perfilometria. Os resultados foram submetidos à ANOVA a um (biopsia básica) e dois critérios (perfilometria) e Teste de Tukey (p<0,05). Todos os grupos de tratamento promoveram menor desgaste dentário em relação ao controle, sendo que entre eles, a irradiação laser promoveu o pior...

The laser application on enamel associated or not to the topic fluoride have been showed to increase the resistance to acid action. This study aimed to evaluate the effect of high intensity laser irradiation submitted to dental erosion and/or abrasion. Hence, 184 enamel samples were selected by surface microhardness (initial SMH) and then divided into 8 groups with 23 specimens each (3 were selected to routine biopsy of enamel surface, 10 submitted to erosion procedure and another 10 were submitted to erosion associated to abrasion): G1 without treatment (control group); G2 treated with acidic phosphate for 4 min (1.23% F); G3 fluoride varnish; G4 - irradiation with Nd:YAG laser (56.6 J/cm2) ; G5 - acidic phosphate fluoride with posterior irradiation with Nd:YAG laser (56.6 J/cm2) ; G6 application of acidic phosphate fluoride with previous irradiation of Nd:YAG laser (56,6 J/cm2); G7- application of fluoride varnish with posterior laser irradiation with Nd:YAG laser (56,6 J/cm2); G8- application of fluoride varnish with previous irradiation of Nd:YAG laser (56,6 J/cm2). After the treatments, the samples were submitted to erosive cycling with 4 diary immersions in acidic beverages with pH 2.6, 0.32 F ppm (Coca-Cola Company, Spal, Porto Real, RJ, Brasil) for 2 min followed by remineralized solution for 5 days. To groups submitted to erosive associated to abrasion, once a day after each cycling, the specimens were submitted to abrasion with 40 simulated brushing cycles with power of 2.5 N. The enamel samples were evaluated by profilemetry. The results were submitted to one way ( routine biopsy) and two way (profilometry) ANOVA and Tukey test (p < 0.05). All the groups demonstrated a wear dental decrease in relation to control group, and among them, the laser irradiation promoted the worst outcome (p < 0.05). The groups related to fluoride resulted in increase concentration of fluoride in the enamel...

Efeito da irradiação laser associada à aplicação tópica de fluoreto sobre o esmalte submetido à erosão e/ou abrasão / Effect of laser irradiation associated with topic application of fluoride on sound enamel submetted to erosion and/or abrasion

A aplicação do laser sobre o esmalte associada ou não a aplicação tópica de fluoreto têm demonstrado aumentar sua resistência à ação de ácidos. O presente estudo teve como objetivo avaliar o efeito da irradiação laser de alta potência associada à aplicação de fluoretos sobre o esmalte dentário submetido à erosão e/ou abrasão dentária. Para tal, 184 blocos de esmalte foram selecionados pela microdureza de superfície (SMH inicial) e foram divididos em 8 grupos com 23 espécimes cada (3 foram utilizados para realização da biópsia básica da superfície de esmalte dentário, 10 foram submetidos à erosão e os outros 10 à erosão associada à abrasão): G1- sem tratamento (controle); G2- tratamento com flúor fosfato acidulado (1,23% F) por 4 min; G3- verniz fluoretado; G4- irradiação com laser Nd:YAG (56,6 J/cm2); G5- aplicação de flúor fosfato acidulado e posterior irradiação com laser Nd:YAG (56,6 J/cm2); G6- aplicação de flúor fosfato acidulado e prévia irradiação com laser Nd:YAG (56,6 J/cm2); G7- aplicação de verniz fluoretado e posterior irradiação com laser Nd:YAG (56,6 J/cm2); G8- aplicação de verniz fluoretado e prévia irradiação com laser Nd:YAG (56,6 J/cm2). Após os tratamentos, os blocos submetidos à ciclagem erosiva sofreram 4 imersões diárias em bebida ácida com pH 2,6, 0,32 ppm F (Coca-Cola Company, Spal, Porto Real, RJ, Brasil), por 2 min, seguida pela imersão em solução remineralizadora por 2 h, durante 5 dias. Nos blocos submetidos à erosão associada à abrasão, uma vez ao dia após cada ciclo, os espécimes foram submetidos à abrasão com 40 ciclos de escovação simulada com força de 2,5 N. Os blocos de esmalte foram avaliados por meio da perfilometria. Os resultados foram submetidos à ANOVA a um (biopsia básica) e dois critérios (perfilometria) e Teste de Tukey (p<0,05). Todos os grupos de tratamento promoveram menor desgaste dentário em relação ao controle, sendo que entre eles, a irradiação laser promoveu o pior...

The laser application on enamel associated or not to the topic fluoride have been showed to increase the resistance to acid action. This study aimed to evaluate the effect of high intensity laser irradiation submitted to dental erosion and/or abrasion. Hence, 184 enamel samples were selected by surface microhardness (initial SMH) and then divided into 8 groups with 23 specimens each (3 were selected to routine biopsy of enamel surface, 10 submitted to erosion procedure and another 10 were submitted to erosion associated to abrasion): G1 without treatment (control group); G2 treated with acidic phosphate for 4 min (1.23% F); G3 fluoride varnish; G4 - irradiation with Nd:YAG laser (56.6 J/cm2) ; G5 - acidic phosphate fluoride with posterior irradiation with Nd:YAG laser (56.6 J/cm2) ; G6 application of acidic phosphate fluoride with previous irradiation of Nd:YAG laser (56,6 J/cm2); G7- application of fluoride varnish with posterior laser irradiation with Nd:YAG laser (56,6 J/cm2); G8- application of fluoride varnish with previous irradiation of Nd:YAG laser (56,6 J/cm2). After the treatments, the samples were submitted to erosive cycling with 4 diary immersions in acidic beverages with pH 2.6, 0.32 F ppm (Coca-Cola Company, Spal, Porto Real, RJ, Brasil) for 2 min followed by remineralized solution for 5 days. To groups submitted to erosive associated to abrasion, once a day after each cycling, the specimens were submitted to abrasion with 40 simulated brushing cycles with power of 2.5 N. The enamel samples were evaluated by profilemetry. The results were submitted to one way ( routine biopsy) and two way (profilometry) ANOVA and Tukey test (p < 0.05). All the groups demonstrated a wear dental decrease in relation to control group, and among them, the laser irradiation promoted the worst outcome (p < 0.05). The groups related to fluoride resulted in increase concentration of fluoride in the enamel...

Factors influencing fluoride ingestion from dentifrice by children.

OBJECTIVE: This study assessed the percentage of the amount of dentifrice loaded onto the toothbrush that is ingested by children, taking into account age, the amount of dentifrice used during toothbrushing, and the dentifrice flavor. METHODS: The sample consisted of 155 children of both genders attending public kindergartens and schools in Bauru, Brazil, divided into 5 groups (n = 30-32) of children aged 2, 3, 4, 5 and 6 years old. The dentifrices used were Sorriso™ (1219 ppm F, peppermint-flavored) and Tandy™ (959 ppm F, tutti-frutti-flavored). The assessment of fluoride intake from dentifrices was carried out six times for each child, using 0.3, 0.6, and 1.2 g of each dentifrice, following a random, crossover distribution. Brushing was performed by the children or their parents/caregivers according to the home habits and under the observation of the examiner. Fluoride present in the expectorant and on toothbrush was analyzed with an ion-specific electrode after HMDS-facilitated diffusion. Fluoride ingestion was indirectly derived. Results were analyzed by 3-way repeated-measures anova and Tukey's tests (P < 0.05) using the percent dentifrice ingested as response variable. RESULTS: Age and percent dentifrice ingested for both dentifrices, and the three amounts used were inversely related (P < 0.0001). Percent dentifrice ingested was significantly higher after the use of Tandy™ under all conditions of the study when compared with Sorriso™ (P < 0.0001). Significant differences were observed when brushing with 0.3 g when compared with 1.2 g, for both dentifrices tested (P < 0.05). CONCLUSIONS: The results indicate that all variables tested must be considered in preventive measures aiming to reduce the amount of fluoride ingested by young children.

Bilateral talon cusp: case report / Garra bilateral cúspide: reportagem de caso

Talon cusp is an uncommon condition often present in the maxillary incisors and mandibular premolars. Morphologically, this anomaly has a well-delineated cusp that extends at least half the distance from the cementoenamel junction or cingulum area to the incisal edge. The alteration can cause clinical problems such as caries or occlusal interference. Management of the talon cusp varies according to the circunstances of the individual case and should be as conservative as possible. Presented is a case of bilateral bifid talon cusp in maxillary central incisors that was successfully managed with conservative therapy