Cold Atmospheric Plasma Jet as a Possible Adjuvant Therapy for Periodontal Disease.

Due to the limitations of traditional periodontal therapies, and reported cold atmospheric plasma anti-inflammatory/antimicrobial activities, plasma could be an adjuvant therapy to periodontitis. Porphyromonas gingivalis was grown in blood agar. Standardized suspensions were plated on blood agar and plasma-treated for planktonic growth. For biofilm, dual-species Streptococcus gordonii + P. gingivalis biofilm grew for 48 h and then was plasma-treated. XTT assay and CFU counting were performed. Cytotoxicity was accessed immediately or after 24 h. Plasma was applied for 1, 3, 5 or 7 min. In vivo: Thirty C57BI/6 mice were subject to experimental periodontitis for 11 days. Immediately after ligature removal, animals were plasma-treated for 5 min once-Group P1 (n = 10); twice (Day 11 and 13)-Group P2 (n = 10); or not treated-Group S (n = 10). Mice were euthanized on day 15. Histological and microtomography analyses were performed. Significance level was 5%. Halo diameter increased proportionally to time of exposure contrary to CFU/mL counting. Mean/SD of fibroblasts viability did not vary among the groups. Plasma was able to inhibit P. gingivalis in planktonic culture and biofilm in a cell-safe manner. Moreover, plasma treatment in vivo, for 5 min, tends to improve periodontal tissue recovery, proportionally to the number of plasma applications.

Influence of methods of application of self-etching adhesive systems on adhesive bond strength to enamel.

PURPOSE: To assess the influence of variations in the application technique of self-etching adhesive systems on the adhesive bond strength to enamel. MATERIALS AND METHODS: One hundred thirty bovine teeth were used and divided into 13 groups. The teeth were embedded in acrylic resin, ground until a flat enamel area was exposed, and polished with 600-grit abrasive paper. The self-etching adhesive systems One Up Bond F, Clearfil SE Bond, Self & Etch were used, and the conventional adhesive Magic Bond and acid etching were used as the control group. One or two layers of the self-etching systems were actively or passively applied. Composite cylinders were made over the bonding area. The samples were submitted to shear bond testing at a speed of 1 mm/min. Statistical analysis of the data was performed using two-way ANOVA, followed by Tukey's test at a 5% level of significance. RESULTS: Significant variations were observed for the factors type of adhesive (p = 0.001, F = 193,3594, df = 3) and application technique (p = 0.001, F = 29,9119, df = 1). No significant interaction was found between the two factors (p = 0.08). The adhesives Clearfil SE Bond and One Up Bond F presented significantly higher adhesive bond strength means than Self & Etch. The active application of two layers resulted in higher bond strength means than the other techniques. CONCLUSION: The application technique had a significant influence on adhesive bond strength to enamel.

Terapias alternativas para o tratamento da estomatite por prótese total: modelo experimental in vivo em ratos / Alternative therapies for denture stomatitis treatment: in vivo experimental model in rats

A estomatite por prótese (EP) é uma condição multifatorial que acomete frequentemente usuários de prótese total e geralmente é relacionada com Candida albicans. Devido aos efeitos tóxicos da terapia antifúngica, novas terapias para EP são necessárias. Objetivos: O objetivo deste estudo foi avaliar a eficácia do extrato aquoso de Buchenavia tomentosa e bicarbonato de sódio frente a C. albicans em um modelo de EP em ratos. Material e Métodos: Um aparelho de resina acrílica simulando a base da prótese total foi fixado cobrindo o palato de 48 ratos machos seguido por indução da candidose. Os ratos foram divididos em 4 grupos (n=12): controle, bicarbonato de sódio, B. tomentosa e nistatina (controle positivo). Cada grupo foi subdividido de acordo com o período de tratamento; 24 horas (n=6) e 48 horas (n=6). Os animais foram sacrificados e os aparelhos foram removidos para contagem de C. albicans e análise por microscopia eletrônica de varredura. Resultados: Após 24 horas de tratamento, observou-se redução significativa da contagem de C. albicans tanto B. tomentosa quanto nistatina (nistatina x controle, p<0,01; B. tomentosa x controle, p=0,03). Os resultados foram confirmados pela análise histológica. Conclusão: Tanto o extrato aquoso de B. tomentosa e o bicarbonato de sódio foram capazes de reduzir significativamente as contagens de C. albicans em modelo experimental de EP (AU)

Background: Denture stomatitis (DS) is a multifactorial condition that commonly affects denture users and is mainly caused by Candida albicans. Due to the toxic effects of antifungal therapy, new therapies for DS are claimed. Objective: The aim of the study was to evaluate the efficacy of aqueous extract of Buchenavia tomentosa and sodium bicarbonate against C. albicans in a model of DS in rats. Material and Methods: An acrylic resin device simulating a denture base was fixed covering the palate of forty-eight male rats followed by candidiasis induction. Rats were divided into 4 groups (n = 12): Control, sodium bicarbonate, B. tomentosa and nystatin (positive control). Each group was subdivided according to the period of treatment; 24 h (n = 6) and 48 h (n = 6). Animals were sacrificed and had their devices removed for C. albicans counts and SEM analysis. The palate mucosa was removed and processed for histopathologic analysis. Results: After 24 h of treatment, both B. tomentosa and nystatin groups reduced significantly C. albicans counts when compared to control (nystatin x control, p < 0.01; B. tomentosa x control, p = 0.03). The results were confirmed by the histologic analysis. Conclusion: Both the aqueous extract of B. tomentosa and sodium bicarbonate was able to significantly decrease C. albicans counts in an experimental model of DS (AU)