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1.
Braz Oral Res ; 34: e080, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32696910

RESUMO

The aims of the present study were to compare conventional radiography, radiographs digitized with a scanner or photographic camera, and digital radiography, used to evaluate the radiopacity of endodontic materials, and to compare the accuracy of linear and quadratic models used to convert radiopacity values to equivalent millimeters of aluminum (mm Al). Specimens of AH Plus, Endofill, Biodentine and BioMTA materials (n = 8) were radiographed next to an aluminum step-wedge using radiographic films and digital radiography systems (FONA CMOS sensor, Kodak CMOS sensor and photosensitive phosphor plate-PSP). Conventional radiographs were digitized using a scanner or photographic digital camera. Digital images of all the radiographic systems were evaluated using dedicated software. Optical density units (ODU) of the specimens and the aluminum step-wedge were evaluated by a photo-densitometer (PTDM), used in conventional radiographs. The radiopacity in equivalent mm Al of the materials was determined by linear and quadratic models, and the coefficients of determination (R2) values were calculated for each model. Radiopacity of the materials ranged from -9% to 25% for digital systems and digitized radiographs, compared to the PTDM (p < 0.05). The R2 values of the quadratic model were higher than those of the linear model. In conclusion, the FONA CMOS sensor showed the lowest radiopacity variability of the methodologies used, compared with the PTDM, except for the BioMTA group (higher than PTDM). The quadratic model showed higher R2 values than the linear model, thus indicating better accuracy and possible adoption to evaluate the radiopacity of endodontic materials.

2.
Microsc Res Tech ; 83(4): 375-380, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31833180

RESUMO

The aim was to assess the effects of 1% peracetic acid (PAA) as a single endodontic irrigant on microhardness, roughness, and erosion of root canal dentin, compared with 2.5% sodium hypochlorite (NaOCl) and with 2.5% NaOCl combined with 17% EDTA. Forty human, single-rooted tooth hemisections were submitted to Knoop microhardness test, before and after the following irrigation protocols: PAA = 1% PAA; NaOCl = 2.5% NaOCl; NaOCl-EDTA-NaOCl = 2.5% NaOCl +17% EDTA +2.5% NaOCl; and SS = saline. Another 40 roots were instrumented, irrigated with the same protocols, and sectioned longitudinally. The roughness analysis was performed on the mesial section using a confocal laser scanning microscope, whereas erosion was analyzed on each third of the distal section, using a scanning electron microscope. The data were analyzed using ANOVA and Tukey post-tests, and Kruskal-Wallis and Dunn post-tests (α = .05). The PAA and NaOCl-EDTA-NaOCl groups showed no significant differences (p > .05); both promoted reduction in microhardness and increase in roughness, compared with the NaOCl and SS groups (p < .05). NaOCl-EDTA-NaOCl promoted higher erosion in the cervical and middle thirds than the other groups (p < .05); there was no difference among PAA, NaOCl, and SS (p > .05). There was also no difference among the groups regarding the apical third (p > .05). PAA used as a single endodontic irrigant caused reduction in root canal dentin microhardness and increase in roughness in a similar way to NaOCl-EDTA-NaOCl; however, PAA caused less erosion than NaOCl-EDTA-NaOCl.

3.
Braz Oral Res ; 33: e057, 2019 Jul 29.
Artigo em Inglês | MEDLINE | ID: mdl-31365704

RESUMO

The aim of this study was to evaluate the effect of peracetic acid (PAA) as a single irrigant on the smear layer, on the intraradicular dentinal bond strength, and on the penetrability of an epoxy-based resin sealer into the dentinal tubules. A total of 120 roots were distributed into 4 groups according to the irrigant used in root canal preparation: 1% PAA (PAA); 2.5% NaOCl followed by final irrigation with 17% EDTA and 2.5% NaOCl (NaOCl-EDTA-NaOCl); 2.5% NaOCl (NaOCl); and saline solution (SS). The smear layer was evaluated using scanning electron microscopy. The bond strength of an epoxy-based resin sealer (AH Plus) to root dentin was evaluated by the push-out test and penetrability of the sealer into dentinal tubules was observed by confocal laser microscopy. The results were analyzed by the Kruskal-Wallis and the Dunn post-test (α = 0.05). The use of 1% PAA as single root canal irrigant provided smear layer removal and improved the penetrability and bond strength of AH Plus to root dentin in a manner similar to that of the NaOCl-EDTA-NaOCl group (p > 0.05). The NaOCl and SS groups had higher values of smear layer and lower values of sealer penetrability and dentin bond strength than the PAA and NaOCl-EDTA-NaOCl groups (p < 0.05). Thus, 1% PAA has the potential to be used as a single irrigant in root canals.


Assuntos
Cavidade Pulpar/efeitos dos fármacos , Dentina/efeitos dos fármacos , Resinas Epóxi/química , Ácido Peracético/química , Materiais Restauradores do Canal Radicular/química , Irrigantes do Canal Radicular/química , Camada de Esfregaço/química , Colagem Dentária/métodos , Cavidade Pulpar/química , Dentina/química , Ácido Edético/química , Humanos , Teste de Materiais , Microscopia Confocal , Microscopia Eletrônica de Varredura , Valores de Referência , Reprodutibilidade dos Testes , Hipoclorito de Sódio/química
4.
Arch Oral Biol ; 107: 104481, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31336203

RESUMO

OBJECTIVE: This study aimed to evaluate the antimicrobial and biofilm anti-adhesion activities of poly(vinyl alcohol)-coated silver nanoparticles (AgNPs-PVA) and farnesol against Enterococcus faecalis, Candida albicans or Pseudomonas aeruginosa. DESIGN: Minimum inhibitory concentration (MIC) and minimum microbicidal concentration (MMC) of the solutions, as well as the effect on the biofilm biomass were evaluated. The biofilm anti-adhesion activity was evaluated using bovine root dentine treated with the solutions after 3 min of contact and analyzed by scanning electron microscopy (SEM) and by colony-forming units per milliliter (CFU mL-1) counting. Data were analyzed using ANOVA and Tukey's, the paired Student's t-test or Kruskal-Wallis and Dunn's tests (α = 0.05). RESULTS: The MIC and MMC values (MIC/MMC) of the AgNPs-PVA and farnesol against E. faecalis were 42.5/50 µM and 0.85/1.0%, respectively. For C. albicans, the values were 27.5/37.5 µM and 1.75/2.5%; and for P. aeruginosa, 32.5/32.5 µM and 2.5/2.75%, respectively. Both solutions showed reduced biofilm biomass (p < 0.05). SEM analysis showed that dentine blocks treated with both solutions had lower biofilm formation than the control (saline), except for C. albicans. In the CFU mL-1 counting, biofilm cells were viable in the all groups in comparison with control (p > 0.05). CONCLUSIONS: AgNPs-PVA and farnesol showed antimicrobial and biofilm anti-adhesion activities, as well as potential for use as coadjuvant in endodontic treatment, and may be an option as auxiliary procedure for root canal disinfection or to inhibit biofilm formation.


Assuntos
Anti-Infecciosos/farmacologia , Biofilmes/efeitos dos fármacos , Farneseno Álcool/farmacologia , Nanopartículas Metálicas , Irrigantes do Canal Radicular/farmacologia , Prata/farmacologia , Animais , Aderência Bacteriana/efeitos dos fármacos , Candida albicans/efeitos dos fármacos , Bovinos , Cavidade Pulpar , Enterococcus faecalis/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Pseudomonas aeruginosa/efeitos dos fármacos
5.
Cytokine ; 123: 154760, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31226439

RESUMO

Cystatins are natural inhibitors of cysteine peptidases. Recently, cystatins derived from plants, named phytocystatins, have been extensively studied. Among them, CsinCPI-2 proteins from Citrus sinensis were identified and recombinantly produced by our group. Thus, this study described the recombinant expression, purification, and inhibitory activity of this new phytocystatin against human cathepsins K and B and assessed the anti-inflammatory effect of CsinCPI-2 in vitro in mouse and in vivo in rats. In addition, the pro-osteogenic effect of CsinCPI-2 was investigated in vitro. The inflammatory response of mouse macrophage cells stimulated with P. gingivalis was modulated by CsinCPI-2. The in vitro results showed an inhibitory effect (p < 0.05) on cathepsin K, cathepsin B, IL-1ß, and TNF-α gene expression. In addition, CsinCPI-2 significantly inhibited in vivo the activity of TNF-α (p < 0.05) in the blood of rats, previously stimulated by E. coli lipopolysaccharide (LPS). CsinCPI-2 had a pro-osteogenic effect in human dental pulp cells, demonstrated by the increase in alkaline phosphatase (ALP) activity, deposition of mineralized nodules, and the gene expression of the osteogenic markers as bone morphogenetic protein 2 (BMP-2), runt-related transcription factor 2 (Runx-2), ALP, osteocalcin, and bone sialoprotein (BSP). These preliminary studies suggested that CsinCPI-2 has a potential anti-inflammatory, and at the same time, a pro-osteogenic effect. This may lead to new therapies for the control of diseases where inflammation plays a key role, such as periodontal disease and apical periodontitis.

6.
Braz Dent J ; 30(3): 213-219, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31166398

RESUMO

The aim of this study was to assess cytotoxicity and cell migration of calcium hypochlorite [Ca(OCl)2] and octenidine hydrochloride - OCT (Octenisept®, Schülke & Mayr, Norderstedt, Germany) in L929 and human periodontal ligament (hPDL) cells. The cells were exposed to different doses of different solutions: 2.5% and 5% Ca(OCl)2, 0.1% OCT, 2.5% NaOCl and 2% CHX for 10 min. Cell viability was assessed by methyl-thiazol-tetrazolium (MTT) and neutral red (NR) assays, and cell migration was determined by wound-healing assay. Statistical analysis was performed by two-way ANOVA and Bonferroni tests (α=0.05). The MTT and NR assays revealed that 0.1% OCT was less cytotoxic in hPDL cells (p<0.05), followed by 2% CHX and 2.5% Ca(OCl)2 (p<0.05). There was no significant difference between 2.5% NaOCl and 5% Ca(OCl)2 (p>0.05), but these solutions showed greater cytotoxicity than the others. The result was the same for L929 cells, except that there was no significant difference between 2% CHX and 2.5% Ca(OCl)2 (p>0.05). Wound-healing assay in L929 and hPDL cells showed that cell migration of 0.1% OCT, 2% CHX and 2.5% Ca(OCl)2 groups was higher than 5% Ca(OCl)2 and 2.5% NaOCl groups at 24 h (p<0.05). In conclusion, 0.1% OCT had lower cytotoxicity in tested cell lines than CHX, Ca(OCl)2 and NaOCl. Cell migration was higher for 0.1% OCT, 2% CHX and 2.5% Ca(OCl)2. Therefore, in terms of cytotoxicity, OCT and Ca(OCl)2 have the potential to be used as root canal irrigants.


Assuntos
Ligamento Periodontal , Hipoclorito de Sódio , Compostos de Cálcio , Clorexidina , Humanos , Piridinas , Irrigantes do Canal Radicular
7.
Braz. dent. j ; 30(3): 213-219, May-June 2019. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1011553

RESUMO

Abstract The aim of this study was to assess cytotoxicity and cell migration of calcium hypochlorite [Ca(OCl)2] and octenidine hydrochloride - OCT (Octenisept®, Schülke & Mayr, Norderstedt, Germany) in L929 and human periodontal ligament (hPDL) cells. The cells were exposed to different doses of different solutions: 2.5% and 5% Ca(OCl)2, 0.1% OCT, 2.5% NaOCl and 2% CHX for 10 min. Cell viability was assessed by methyl-thiazol-tetrazolium (MTT) and neutral red (NR) assays, and cell migration was determined by wound-healing assay. Statistical analysis was performed by two-way ANOVA and Bonferroni tests (α=0.05). The MTT and NR assays revealed that 0.1% OCT was less cytotoxic in hPDL cells (p<0.05), followed by 2% CHX and 2.5% Ca(OCl)2 (p<0.05). There was no significant difference between 2.5% NaOCl and 5% Ca(OCl)2 (p>0.05), but these solutions showed greater cytotoxicity than the others. The result was the same for L929 cells, except that there was no significant difference between 2% CHX and 2.5% Ca(OCl)2 (p>0.05). Wound-healing assay in L929 and hPDL cells showed that cell migration of 0.1% OCT, 2% CHX and 2.5% Ca(OCl)2 groups was higher than 5% Ca(OCl)2 and 2.5% NaOCl groups at 24 h (p<0.05). In conclusion, 0.1% OCT had lower cytotoxicity in tested cell lines than CHX, Ca(OCl)2 and NaOCl. Cell migration was higher for 0.1% OCT, 2% CHX and 2.5% Ca(OCl)2. Therefore, in terms of cytotoxicity, OCT and Ca(OCl)2 have the potential to be used as root canal irrigants.


Resumo Para a seleção do irrigante endodôntico deve-se considerar os possíveis efeitos citotóxicos. O objetivo foi avaliar os efeitos do hipoclorito de cálcio [Ca(OCl)2] e do cloridrato de octenidina (OCT) em células L929 e do ligamento periodontal humano (hPDL). As células foram expostas a diferentes doses das soluções: Ca(OCl)2 2,5% e 5%, OCT 0,1%, hipoclorito de sódio (NaOCl) 2,5% e clorexidina (CHX) 2%. A viabilidade celular foi avaliada pelos ensaios de metil-tiazol-tetrazólio (MTT) e vermelho neutro (NR), e a proliferação/migração pelo teste de cicatrização. Os resultados foram analisados por ANOVA de duas vias e Bonferroni (α=0,05). Os ensaios MTT e NR mostraram que OCT 0,1% foi menos citotóxico nas células do hPDL (p<0,05), seguido da CHX 2% e Ca(OCl)2 2,5% (p<0,05). Não houve diferença entre NaOCl 2,5% e Ca(OCl)2 5% (p>0,05). No entanto, estas soluções foram mais citotóxicas que as demais. O resultado foi o mesmo nas células L929, exceto que não houve diferença significativa entre CHX 2% e Ca(OCl)2 2,5% (p>0,05). A proliferação/migração das células L929 e do hPDL às 24 h nos grupos OCT 0,1%, CHX 2%, e Ca(OCl)2 2,5% foi maior que nos grupos Ca(OCl)2 5% e NaOCl 2,5% (p<0,05). Concluiu-se que OCT foi menos citotóxico que CHX, Ca(OCl)2 e NaOCl. Ca(OCl)2 2,5 e 5% apresentaram citotoxicidade menor ou similar ao NaOCl 2,5%, respectivamente. Os grupos OCT, CHX e Ca(OCl)2 2,5% apresentaram maior proliferação/migração celular do que os grupos do Ca(OCl)2 5% e NaOCl 2,5%. Portanto, OCT e Ca(OCl)2 têm potencial para serem utilizados como irrigantes endodônticos.

8.
J Appl Oral Sci ; 27: e20180429, 2019 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-30970115

RESUMO

OBJECTIVES: To evaluate the radiopacity of Biodentine (BD) and BD associated with 15% calcium tungstate (BDCaWO4) or zirconium oxide (BDZrO2), by using conventional and digital radiography systems, and their physicochemical and biological properties. MATERIALS AND METHODS: Radiopacity was evaluated by taking radiographs of cement specimens (n=8) using occlusal film, photostimulable phosphor plates or digital sensors. Solubility, setting time, pH, cytocompatibility and osteogenic potential were also evaluated. Data were analyzed using one-way ANOVA and Tukey post-test or two-way ANOVA and Bonferroni post-test (α=0.05). RESULTS: BD radiopacity was lower than 3 mm Al, while BD ZrO2 and BD CaWO4 radiopacity was higher than 3 mm Al in all radiography systems. The cements showed low solubility, except for BDCaWO4. All cements showed alkaline pH and setting time lower than 34 minutes. MTT and NR assays revealed that cements had greater or similar cytocompatibility in comparison with control. The ALP activity in all groups was similar or greater than the control. All cements induced greater production of mineralized nodules than control. CONCLUSIONS: Addition of 15% ZrO2 or CaWO4 was sufficient to increase the radiopacity of BD to values higher than 3 mm Al. BD associated with radiopacifiers showed suitable properties of setting time, pH and solubility, except for BDCaWO4, which showed the highest solubility. All cements had cytocompatibility and potential to induce mineralization in Saos-2 cells. The results showed that adding 15% ZrO2 increases the radiopacity of BD, allowing its radiography detection without altering its physicochemical and biological properties.


Assuntos
Compostos de Cálcio/química , Radiografia Dentária Digital/métodos , Silicatos/química , Compostos de Tungstênio/química , Zircônio/química , Fosfatase Alcalina/análise , Análise de Variância , Antraquinonas , Compostos de Cálcio/farmacologia , Sobrevivência Celular/efeitos dos fármacos , Humanos , Concentração de Íons de Hidrogênio , Teste de Materiais , Osteoblastos/efeitos dos fármacos , Valores de Referência , Reprodutibilidade dos Testes , Silicatos/farmacologia , Solubilidade , Fatores de Tempo , Compostos de Tungstênio/farmacologia , Zircônio/farmacologia
9.
Braz. oral res. (Online) ; 33: e057, 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1011660

RESUMO

Abstract The aim of this study was to evaluate the effect of peracetic acid (PAA) as a single irrigant on the smear layer, on the intraradicular dentinal bond strength, and on the penetrability of an epoxy-based resin sealer into the dentinal tubules. A total of 120 roots were distributed into 4 groups according to the irrigant used in root canal preparation: 1% PAA (PAA); 2.5% NaOCl followed by final irrigation with 17% EDTA and 2.5% NaOCl (NaOCl-EDTA-NaOCl); 2.5% NaOCl (NaOCl); and saline solution (SS). The smear layer was evaluated using scanning electron microscopy. The bond strength of an epoxy-based resin sealer (AH Plus) to root dentin was evaluated by the push-out test and penetrability of the sealer into dentinal tubules was observed by confocal laser microscopy. The results were analyzed by the Kruskal-Wallis and the Dunn post-test (α = 0.05). The use of 1% PAA as single root canal irrigant provided smear layer removal and improved the penetrability and bond strength of AH Plus to root dentin in a manner similar to that of the NaOCl-EDTA-NaOCl group (p > 0.05). The NaOCl and SS groups had higher values of smear layer and lower values of sealer penetrability and dentin bond strength than the PAA and NaOCl-EDTA-NaOCl groups (p < 0.05). Thus, 1% PAA has the potential to be used as a single irrigant in root canals.

10.
J. appl. oral sci ; 27: e20180429, 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-990101

RESUMO

Abstract Objectives: To evaluate the radiopacity of Biodentine (BD) and BD associated with 15% calcium tungstate (BDCaWO4) or zirconium oxide (BDZrO2), by using conventional and digital radiography systems, and their physicochemical and biological properties. Materials and Methods: Radiopacity was evaluated by taking radiographs of cement specimens (n=8) using occlusal film, photostimulable phosphor plates or digital sensors. Solubility, setting time, pH, cytocompatibility and osteogenic potential were also evaluated. Data were analyzed using one-way ANOVA and Tukey post-test or two-way ANOVA and Bonferroni post-test (α=0.05). Results: BD radiopacity was lower than 3 mm Al, while BD ZrO2 and BD CaWO4 radiopacity was higher than 3 mm Al in all radiography systems. The cements showed low solubility, except for BDCaWO4. All cements showed alkaline pH and setting time lower than 34 minutes. MTT and NR assays revealed that cements had greater or similar cytocompatibility in comparison with control. The ALP activity in all groups was similar or greater than the control. All cements induced greater production of mineralized nodules than control. Conclusions: Addition of 15% ZrO2 or CaWO4 was sufficient to increase the radiopacity of BD to values higher than 3 mm Al. BD associated with radiopacifiers showed suitable properties of setting time, pH and solubility, except for BDCaWO4, which showed the highest solubility. All cements had cytocompatibility and potential to induce mineralization in Saos-2 cells. The results showed that adding 15% ZrO2 increases the radiopacity of BD, allowing its radiography detection without altering its physicochemical and biological properties.

11.
J Endod ; 44(12): 1812-1816, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30477667

RESUMO

INTRODUCTION: The aim of this study was to assess the influence of antibiotic formulations (tablet/capsule [TC] or United States Pharmacopeia [USP]-grade antibiotics) and vehicles (water [H2O] or macrogol + propylene glycol [MP]) on the cytotoxicity and pH of triple antibiotic pastes (TAPs). METHODS: L929 fibroblasts were exposed to TAPs prepared with TC or USP-grade antibiotics mixed with H2O or MP for 72 hours. Each isolated antibiotic with each vehicle, each isolated vehicle, and the culture medium were used as controls. Cytotoxicity was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and neutral red assays. The pH was measured after 3 and 8 hours of immersion of the pastes in water. Data were analyzed using analysis of variance, the Bonferroni or Tukey posttests (α = 0.05), and the Pearson correlation test (α = 0.05). RESULTS: The pastes prepared with TC were less cytotoxic than pastes prepared with USP-grade antibiotics (P < .05), and pastes with the MP vehicle were less cytotoxic than pastes with H2O (P < .05). TC TAP + MP showed the lowest cytotoxicity, whereas USP-grade TAP + H2O showed the highest cytotoxicity (P < .05). All TAPs showed a pH ranging from 4.64-5.20. Irrespective of the vehicle, USP-grade TAP showed a lower pH than TC TAP (P < .05). TAPs with H2O had a lower pH than TAPs with MP (P < .05). CONCLUSIONS: The vehicle and the antibiotic formulations influenced the cytotoxicity and pH of TAP. The pastes prepared with TC and MP were less acidic and less cytotoxic than the type prepared with USP-grade antibiotics and H2O.


Assuntos
Antibacterianos/efeitos adversos , Sobrevivência Celular/efeitos dos fármacos , Composição de Medicamentos/métodos , Fibroblastos/efeitos dos fármacos , Veículos Farmacêuticos , Polietilenoglicóis , Propilenoglicol , Irrigantes do Canal Radicular/efeitos adversos , Água , Animais , Células Cultivadas , Combinação de Medicamentos , Concentração de Íons de Hidrogênio , Camundongos , Pomadas , Endodontia Regenerativa
12.
Microsc Res Tech ; 81(6): 523-527, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29436057

RESUMO

The aim of this study was to assess the cleaning capacity of the octenidine hydrochloride (OCT) used as root canal irrigant by scanning electron microscopy (SEM) analysis. Sixty human unirradicular extracted teeth were randomly distributed in 6 groups (n = 10) according to irrigant solutions which were used during root canal preparation: G1, 0.1% OCT; G2, 2% chlorhexidine (CHX); G3, 2.5% sodium hypochlorite (NaOCl); G4, OCT + 17% ethylenediaminetetraacetic acid (EDTA); G5, 2.5% NaOCl + 17% EDTA and G6, distilled water. All specimens were instrumented with ProTaper system up to F4. Teeth were sectioned and prepared for SEM. The smear layer was evaluated using a 5-score system and the data were analyzed by Kruskal-Wallis and Dunn (α = 0.05). In all root canal thirds there was no significant difference between OCT, CHX, NaOCl, and water groups (p > .05), and these groups showed higher smear layer values than NaOCl + EDTA and OCT + EDTA groups (p < .05). There was no significant difference between NaOCl + EDTA and OCT + EDTA groups (p > .05). It was concluded that OCT used as a single root canal irrigant presented poor cleaning capacity and could be used in association with a final irrigation with EDTA to obtain smear layer removal.


Assuntos
Clorexidina/farmacologia , Ácido Edético/farmacologia , Piridinas/farmacologia , Irrigantes do Canal Radicular/farmacologia , Preparo de Canal Radicular/métodos , Hipoclorito de Sódio/farmacologia , Dente Pré-Molar , Cavidade Pulpar , Humanos , Microscopia Eletrônica de Varredura
13.
Arch Oral Biol ; 84: 89-93, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28965044

RESUMO

OBJECTIVE: To evaluate the cytotoxicity, genotoxicity and antibacterial activity of poly(vinyl alcohol)-coated silver nanoparticles (AgNPs-PVA) and farnesol (FAR). DESIGN: The cytotoxicity (% of cell viability) was evaluated by MTT assay and the genotoxicity (% of DNA in the tail) was evaluated by Comet assay. Root canal disinfection with different irrigating protocols was evaluated ex vivo in human teeth contaminated with Enterococcus faecalis for 21days. Three microbiological samples were collected: initial (after contamination); post-irrigation (after irrigation); and final (after 7days). After each sample, the number of log 10 CFU mL-1 was determined. Statistical analyses was performed using two-way ANOVA and Bonferroni post-hoc tests for MTT assay, Kruskal-Wallis and Dunn post-hoc tests for Cometa and antibacterial assays (α=0.05). RESULTS: The MTT assay showed that AgNPs and FAR were less cytotoxic that sodium hypochlorite (NaOCl) and showed a lower% of DNA in the tail, in comparison with H2O2 (positive control - C+). In the post-irrigation microbiological sample, all the irrigating protocols were more effective than C+ (without irrigation). NaOCl/saline, NaOCl/saline/AgNPs-PVA and NaOCl/saline/FAR led to complete bacterial elimination (p >0.05). In comparison with the initial sample, both the post-irrigation and the final samples showed microbial reduction (p < 0.05). CONCLUSIONS: AgNPs-PVA and FAR showed low cytotoxicity and genotoxicity, and exhibit potential for use as a final endodontic irrigation protocols.


Assuntos
Antibacterianos/farmacologia , Materiais Revestidos Biocompatíveis/farmacologia , Enterococcus faecalis/efeitos dos fármacos , Farneseno Álcool/farmacologia , Nanopartículas Metálicas , Álcool de Polivinil/farmacologia , Irrigantes do Canal Radicular/farmacologia , Prata/farmacologia , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Contagem de Colônia Microbiana , Ensaio Cometa , Desinfecção , Fibroblastos/efeitos dos fármacos , Humanos , Técnicas In Vitro , Testes de Mutagenicidade , Hipoclorito de Sódio/farmacologia
14.
Microsc Res Tech ; 80(9): 1036-1048, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28548699

RESUMO

The aim was to evaluate the cytocompatibility of the AH Plus and Sealapex associated with amoxicillin (AA) in a quantity of 10% by total weight of the sealers, the flow and setting time of these sealers with 10%-0.25% AA and antibiofilm activity of these sealers associated with AA in a concentration that does not alter their physical properties (1%). Cytocompatibility was assessed by MTT, neutral red and cytoskeletal fluorescence assays. Setting time and flow was evaluated using the specifications of ISO 6876/2012. For the antibiofilm evaluation, materials were placed in direct contact with E. faecalis biofilm induced on dentin blocks. The incorporation of AA into the sealers did not diminish the viability of the fibroblasts and did not cause structural changes in the cytoskeletal. The flow of AH Plus + AA at 1.0; 0.5 and 0.25%, and of Sealapex + AA at 5.5; 2.5; 1.0; 0.5 and 0.25% were within the specifications of the ISO 6876. AH Plus, and AH Plus + AA at 1.0; 0.50 and 0.25% presented a setting time of 730, 439, 455, and 474 min., respectively. Sealapex - pure or associated with AA did not set completely. The addition of 1% AA to the sealers did not increase their antibiofilm activity. It was concluded that the incorporation of 10% AA caused no toxic effects on fibroblasts, but harmed the physical properties. The addition of AA in concentration that does not affect the physical properties of the sealers did not increase their antibiofilm activity.


Assuntos
Amoxicilina , Antibacterianos , Materiais Restauradores do Canal Radicular , Amoxicilina/química , Amoxicilina/farmacologia , Amoxicilina/toxicidade , Animais , Antibacterianos/química , Antibacterianos/farmacologia , Antibacterianos/toxicidade , Biofilmes/efeitos dos fármacos , Hidróxido de Cálcio/química , Hidróxido de Cálcio/farmacologia , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Citoesqueleto/efeitos dos fármacos , Enterococcus faecalis/efeitos dos fármacos , Camundongos , Microscopia de Fluorescência , Materiais Restauradores do Canal Radicular/química , Materiais Restauradores do Canal Radicular/farmacologia , Materiais Restauradores do Canal Radicular/toxicidade , Salicilatos/química , Salicilatos/farmacologia
15.
J Appl Oral Sci ; 25(2): 196-202, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28403360

RESUMO

Decalcification of enamel during fixed orthodontic appliance treatment remains a problem. White spot lesions are observed in nearly 50% of patients undergoing orthodontic treatment. The use of fluoride-containing orthodontic materials has shown inconclusive results on their ability to reduce decalcification. The aims of this investigation were to compare the levels of Streptococcus mutans (SM) in saliva and biofilm adjacent to orthodontic brackets retained with a resin-modified glass ionomer cement (RMGIC) (Fuji ORTHO LC) and a light cured composite resin (Transbond XT), and to analyze the influence of topical application of the 1.23% acidulated phosphate fluoride (APF) on SM counts. In a parallel study design, two groups (n=14/15) were used with random allocation and high salivary SM counts before treatment. Biofilm was collected from areas adjacent to the brackets on teeth 13, 22, 33, and 41. Both saliva and biofilm were collected on the 7th, 21st, 35th, and 49th days after appliance placement. Topical fluoride application was carried out on the 35th day. Bonding with RMGIC did not alter SM counts in saliva or biofilm adjacent to the brackets. On the other hand, the biofilm adjacent to brackets retained with composite resin showed a significant increase in SM counts along the trial period. Topical application of 1.23% APF did not reduce salivary or biofilm SM counts regardless of the bonding material. In conclusion, fluoride topical application did not show efficacy in reducing SM. The use of RMGIC as bonding materials allowed a better control of SM cfu counts in dental biofilm hindering the significant increase of these microorganisms along the trial period, which was observed in the biofilm adjacent to the composite material.


Assuntos
Resinas Acrílicas/farmacologia , Silicatos de Alumínio/farmacologia , Biofilmes/efeitos dos fármacos , Fluoretos Tópicos/farmacologia , Cimentos de Ionômeros de Vidro/farmacologia , Braquetes Ortodônticos/microbiologia , Saliva/microbiologia , Streptococcus mutans/efeitos dos fármacos , Adolescente , Análise de Variância , Carga Bacteriana , Cariostáticos/farmacologia , Criança , Colagem Dentária/métodos , Humanos , Reprodutibilidade dos Testes , Cimentos de Resina/farmacologia , Streptococcus mutans/isolamento & purificação , Streptococcus mutans/fisiologia , Fatores de Tempo , Adulto Jovem
16.
J. appl. oral sci ; 25(2): 196-202, Mar.-Apr. 2017. tab, graf
Artigo em Inglês | LILACS | ID: biblio-841177

RESUMO

Abstract Decalcification of enamel during fixed orthodontic appliance treatment remains a problem. White spot lesions are observed in nearly 50% of patients undergoing orthodontic treatment. The use of fluoride-containing orthodontic materials has shown inconclusive results on their ability to reduce decalcification. The aims of this investigation were to compare the levels of Streptococcus mutans (SM) in saliva and biofilm adjacent to orthodontic brackets retained with a resin-modified glass ionomer cement (RMGIC) (Fuji ORTHO LC) and a light cured composite resin (Transbond XT), and to analyze the influence of topical application of the 1.23% acidulated phosphate fluoride (APF) on SM counts. In a parallel study design, two groups (n=14/15) were used with random allocation and high salivary SM counts before treatment. Biofilm was collected from areas adjacent to the brackets on teeth 13, 22, 33, and 41. Both saliva and biofilm were collected on the 7th, 21st, 35th, and 49th days after appliance placement. Topical fluoride application was carried out on the 35th day. Bonding with RMGIC did not alter SM counts in saliva or biofilm adjacent to the brackets. On the other hand, the biofilm adjacent to brackets retained with composite resin showed a significant increase in SM counts along the trial period. Topical application of 1.23% APF did not reduce salivary or biofilm SM counts regardless of the bonding material. In conclusion, fluoride topical application did not show efficacy in reducing SM. The use of RMGIC as bonding materials allowed a better control of SM cfu counts in dental biofilm hindering the significant increase of these microorganisms along the trial period, which was observed in the biofilm adjacent to the composite material.


Assuntos
Humanos , Criança , Adolescente , Adulto Jovem , Resinas Acrílicas/farmacologia , Silicatos de Alumínio/farmacologia , Biofilmes/efeitos dos fármacos , Fluoretos Tópicos/farmacologia , Cimentos de Ionômeros de Vidro/farmacologia , Braquetes Ortodônticos/microbiologia , Saliva/microbiologia , Streptococcus mutans/efeitos dos fármacos , Análise de Variância , Carga Bacteriana , Cariostáticos/farmacologia , Colagem Dentária/métodos , Reprodutibilidade dos Testes , Cimentos de Resina/farmacologia , Streptococcus mutans/isolamento & purificação , Streptococcus mutans/fisiologia , Fatores de Tempo
17.
Braz Dent J ; 28(1): 65-71, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28301020

RESUMO

The aim of this study was to evaluate the cytotoxicity and bioactivity of calcium silicate-based cements combined with niobium oxide (Nb2O5) micro and nanoparticles, comparing the response in different cell lines. This evaluation used four cell lines: two primary cultures (human dental pulp cells - hDPCs and human dental follicle cells - hDFCs) and two immortalized cultures (human osteoblast-like cells - Saos-2 and mouse periodontal ligament cells - mPDL). The tested materials were: White Portland Cement (PC), mineral trioxide aggregate (MTA), white Portland cement combined with microparticles (PC/Nb2O5µ) or nanoparticles (PC/Nb2O5n) of niobium oxide (Nb2O5). Cytotoxicity was evaluated by the methylthiazolyldiphenyl-tetrazolium bromide (MTT) and trypan blue exclusion assays and bioactivity by alkaline phosphatase (ALP) enzyme activity. Results were analyzed by ANOVA and Tukey test (a=0.05). PC/Nb2O5n presented similar or higher cell viability than PC/Nb2O5µ in all cell lines. Moreover, the materials presented similar or higher cell viability than MTA. Saos-2 exhibited high ALP activity, highlighting PC/Nb2O5µ material at 7 days of exposure. In conclusion, calcium silicate cements combined with micro and nanoparticles of Nb2O5 presented cytocompatibility and bioactivity, demonstrating the potential of Nb2O5 as an alternative radiopacifier agent for these cements. The different cell lines had similar response to cytotoxicity evaluation of calcium silicate cements. However, bioactivity was more accurately detected in human osteoblast-like cell line, Saos-2.


Assuntos
Compostos de Cálcio/farmacologia , Cimentos Dentários/farmacologia , Nióbio/farmacologia , Óxidos/farmacologia , Silicatos/farmacologia , Fosfatase Alcalina/metabolismo , Animais , Linhagem Celular , Humanos , Camundongos
18.
Pediatr Dent ; 39(1): 28-33, 2017 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-28292338

RESUMO

PURPOSE: The purpose of this study was to evaluate in vivo the antibacterial effect of calcium hydroxide (CH) dressings, with or without chlorhexidine (CHX), on human primary teeth with apical periodontitis. METHODS: Forty root canals in 40 children were selected. A first microbiological sample was obtained after coronal opening, and the teeth were randomly assigned to Group 1 (root canals filled with CH paste) and Group 2 (CH paste plus 1.0 percent CHX). After 30 days, the dressing was removed and the canals were allowed to remain empty for 72 hours. Subsequently, the second microbiological sample was collected. After performing microbiological tests, the data were subjected to statistical analysis to compare the two CH dressings regarding reducing the absolute levels of microorganisms and with respect to total microbial elimination. All analyses were performed with a significance level of five percent. RESULTS: Both CH dressings provided a significant reduction in the number of microorganisms (anaerobic, aerobic, black-pigmented bacilli, streptococci and Streptococcus mutans) in a similar way (P>0.05). However, in terms of complete elimination of microbiota, CH paste alone exhibited greater efficacy (P<0.05). CONCLUSIONS: The addition of chlorhexidine did not provide additional antimicrobial benefits compared with pure calcium hydroxide paste as an intracanal dressing in primary teeth with apical periodontitis.


Assuntos
Antibacterianos/uso terapêutico , Hidróxido de Cálcio/uso terapêutico , Clorexidina/uso terapêutico , Periodontite Periapical/terapia , Obturação do Canal Radicular/métodos , Dente Decíduo , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Periodontite Periapical/microbiologia
19.
Conscientiae saúde (Impr.) ; 16(1): 2017916, 31 mar. 2017.
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-868431

RESUMO

Objective: The aim of this study was to evaluate the effects on static and dynamic balance after the use of textured insoles. Method: Fifteen subjects with multiple sclerosis were evaluated before using the insoles, after using them for 1 month, and after 2 months without using, them using the following measuring instruments: the Berg Balance Scale, Dynamic Gait Index, and 10-meter Walk Test, a means of functional gait assessment. Results: Improvement was observed in the Berg Balance Scale and Dynamic Gait Index scores, walking time, number of steps and step length after using the insoles for 1 month. The improvement in Berg Balance Scale score remained after two months without the insoles and there were no changes in gait speed. Conclusion: The use of textured insoles was effective as an intervention to improve static and dynamic balance in patients with multiple sclerosis.(AU)


Objetivo: O objetivo deste estudo foi avaliar os efeitos sobre o equilíbrio estático e dinâmico após o uso de palmilhas texturizadas. Método: Quinze indivíduos com esclerose múltipla foram avaliados antes de usar as palmilhas, após usá-las por 1 mês e depois de 2 meses sem usá-las, utilizando os seguintes instrumentos de medição: a Escala de Equilíbrio de Berg, Dynamic Gait Index e teste de caminhada de 10 metros, meios de avaliação funcional da marcha. Resultados: Houve melhora na pontuação Escala de Equilíbrio de Berg e Dynamic Gait Index, tempo de caminhada, o número de passos e comprimento do passo depois de usar as palmilhas. A melhora permaneceu após dois meses sem as palmilhas e não houve mudanças na velocidade da marcha. Conclusão: O uso de palmilhas texturizadas foi eficaz como uma intervenção para melhorar o equilíbrio estático e dinâmico em pacientes com esclerose múltipla.(AU)

20.
Braz. dent. j ; 28(1): 65-71, Jan.-Feb. 2017. tab, graf
Artigo em Inglês | LILACS | ID: biblio-839107

RESUMO

Abstract The aim of this study was to evaluate the cytotoxicity and bioactivity of calcium silicate-based cements combined with niobium oxide (Nb2O5) micro and nanoparticles, comparing the response in different cell lines. This evaluation used four cell lines: two primary cultures (human dental pulp cells - hDPCs and human dental follicle cells - hDFCs) and two immortalized cultures (human osteoblast-like cells - Saos-2 and mouse periodontal ligament cells - mPDL). The tested materials were: White Portland Cement (PC), mineral trioxide aggregate (MTA), white Portland cement combined with microparticles (PC/Nb2O5µ) or nanoparticles (PC/Nb2O5n) of niobium oxide (Nb2O5). Cytotoxicity was evaluated by the methylthiazolyldiphenyl-tetrazolium bromide (MTT) and trypan blue exclusion assays and bioactivity by alkaline phosphatase (ALP) enzyme activity. Results were analyzed by ANOVA and Tukey test (a=0.05). PC/Nb2O5n presented similar or higher cell viability than PC/Nb2O5µ in all cell lines. Moreover, the materials presented similar or higher cell viability than MTA. Saos-2 exhibited high ALP activity, highlighting PC/Nb2O5µ material at 7 days of exposure. In conclusion, calcium silicate cements combined with micro and nanoparticles of Nb2O5 presented cytocompatibility and bioactivity, demonstrating the potential of Nb2O5 as an alternative radiopacifier agent for these cements. The different cell lines had similar response to cytotoxicity evaluation of calcium silicate cements. However, bioactivity was more accurately detected in human osteoblast-like cell line, Saos-2.


Resumo O objetivo deste estudo foi avaliar a citotoxicidade e bioatividade de cimentos à base de silicato de cálcio associados com óxido de nióbio (Nb2O5) micro e nanoparticulados, e comparar a resposta em diferentes linhagens celulares. Foram utilizadas quatro linhagens celulares: duas culturas primárias (células da polpa dentária humana - hDPCs e células do folículo dentário humano - hDFCs) e duas culturas imortalizadas (células osteoblásticas humanas - Saos-2 e células do ligamento periodontal de ratos - mPDL). Os materiais analisados foram: Cimento Portland branco (PC); Agregado trióxido mineral (MTA); PC associado com micropartículas (PC/Nb2O5µ) ou nanopartículas (PC/Nb2O5n) de óxido de nióbio (Nb2O5). A citotoxicidade foi avaliada pelos ensaios de brometo de metil-tiazolil-difeniltetrazólio (MTT) e azul de tripan, e a bioatividade pela atividade da enzima fosfatase alcalina (ALP). Os resultados foram analisados por ANOVA e teste de Tukey (a=0,05). O grupo do PC/Nb2O5n apresentou viabilidade celular semelhante ou maior do que o grupo do PC/Nb2O5μ em todas as linhagens celulares. Além disso, ambos os grupos apresentaram viabilidade celular semelhante ou maior do que o MTA. Saos-2 apresentaram maior atividade de ALP, com destaque para o material PC/Nb2O5μ aos 7 dias de exposição. Concluiu-se que cimentos de silicato de cálcio associados com Nb2O5 micro ou nanoparticulado apresentaram citocompatibilidade e bioatividade, demonstrando potencial do Nb2O5 como agente radiopacificador alternativo para estes cimentos. As linhagens celulares estudadas apresentaram resposta semelhante na avaliação da citotoxicidade de cimentos de silicato de cálcio. No entanto, a bioatividade é melhor detectada na linhagem de células osteoblásticas humanas, Saos-2.


Assuntos
Humanos , Animais , Camundongos , Óxidos/farmacologia , Silicatos/farmacologia , Compostos de Cálcio/farmacologia , Cimentos Dentários/farmacologia , Nióbio/farmacologia , Linhagem Celular , Fosfatase Alcalina/metabolismo
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