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1.
J Adhes Dent ; 22(3): 285-296, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32435769

RESUMO

PURPOSE: To investigate the long-term effect of 0.05% or 0.1% caffeic acid phenethyl ester (CAPE) on dentin matrix stability and hybrid layer stability, using an etch-and-rinse (Adper Scotchbond Multipurpose/ASB) or a self-etch adhesive (Clearfil SE Bond/CSE). MATERIALS AND METHODS: Dentin matrix specimens were assigned to five groups: 0.05% or 0.1% CAPE, green tea (GT), and the controls distilled water (DW) and dimethyl sulfoxide (DMSO). Following immersion of specimens for 1 h, modulus of elasticity (ME) and dentin mass change (MG) were determined at 3 post-treatment time points: immediately afterwards and at 3 and 6 months. Collagen solubilization (CS) was estimated by hydroxyproline (HYP) quantification. Resin-dentin interfaces with both adhesives were assessed with in situ zymography tests to evaluate gelatinolytic activity (GA). The dentin pretreatments were actively applied for 60 s. The sealing ability of aged resin-bonded slices was assessed by nanoleakage tests. RESULTS: GT increased immediate ME, which decreased significantly after 3 months (p < 0.0001). The CAPE groups did not differ from the control groups. GT provided a significant increase in dentin matrix mass after treatment (p < 0.0001). No significant differences regarding MG were observed for CAPE 0.1%, CAPE 0.05%, DW, and DMSO groups after 3 and 6 months. Cumulative HYP release revealed that CAPE groups and GT were statistically similar to DW and DMSO; the GT group exhibited statistically significantly less HYP release than did CAPE groups (p = 0.0073). Treatment with 0.05% or 0.1% CAPE presented lower GA when applied to ASB before acid conditioning (p < 0.05), but no differences were detected when the CAPE groups were applied to CSE. CAPE at 0.1% significantly reduced nanoleakage for CSE, and 0.05% CAPE with CSE presented levels of nanoleakage similar to those of the CSE control group. CONCLUSION: CAPE at 0.05% or 0.01% did not influence ME, MG, or CS, but reduced GA when applied to ASB before acid conditioning. CAPE at 0.1% with CSE promoted adhesive layer integrity.


Assuntos
Colagem Dentária , Adesivos Dentinários , Ácidos Cafeicos , Cimentos Dentários , Dentina , Teste de Materiais , Álcool Feniletílico/análogos & derivados , Resistência à Tração
2.
Oral Health Prev Dent ; 17(6): 579-584, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31508600

RESUMO

PURPOSE: This study investigated the role of desensitising-only and desensitising/whitening versions of arginine and calcium carbonate-containing (ACC) and calcium sodium phosphosilicate-containing (CSPS) toothpastes on surface loss and permeability of root dentine. MATERIALS AND METHODS: Slabs of human root dentine were embedded and exposed to citric acid solution to create a lesion resembling hypersensitive dentine. Sixty specimens were divided into six groups and exposed to slurries made with ACC (Colgate Sensitive Pro-Relief) and CSPS (Sensodyne Repair & Protect) toothpastes, in their desensitising or desensitising/whitening versions, an ordinary toothpaste (Crest Cavity Protection) or distilled water (DI). The other 60 specimens were brushed with either slurries or DI and assessed for surface loss. All specimens were analysed for dentine permeability. Data were subjected to analysis of variance (ANOVA) and Fisher's least statistically significant difference tests. RESULTS: ANOVA (p = 0.018) showed that in the group brushed with DI surface loss was lower than in the groups brushed with toothpastes, but there was no statistically significant difference among the ordinary, desensitising-only and desensitising/whitening toothpastes. Dentine permeability was not influenced by brushing (p = 0.125). Toothpastes affected dentine permeability (p = 0.004), with the groups submitted to desensitising-only and desensitising/whitening toothpastes presenting significantly lower permeability than those submitted to DI, but no difference existed between the group treated with the ordinary toothpaste and DI. CONCLUSION: In comparison to desensitising-only, desensitising/whitening toothpastes neither accounted for increased surface loss nor impaired tubule occlusion of root dentine.


Assuntos
Dessensibilizantes Dentinários , Sensibilidade da Dentina , Dentina , Humanos , Permeabilidade , Cremes Dentais
3.
Am J Dent ; 32(3): 124-132, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31295393

RESUMO

PURPOSE: To conduct a clinical evaluation of dental bleaching techniques using hydrogen peroxide (HP), regarding tooth sensitivity, gingival irritation, subject's perception of color change, and calcium (Ca) and phosphorous (P) concentrations in enamel. METHODS: 75 volunteers were distributed according to the bleaching technique (n=25): (a) at-home: 10%HP (Opalescence GO) for 15 days of continuous use (1 hour per day); (b) in-office: 40%HP (Opalescence Boost) in three clinical sessions (40 minutes each session); (c) combined: one initial session with 40%HP, and the rest with 10%HP for 15 days of continuous use. Clinical evaluations and Ca and P concentration collections were obtained before, during bleaching treatment, and 15 days after conclusion of treatment. The generalized linear models were used to evaluate the data for VITA Classical scale, CIELAB, tooth sensitivity, degree of acceptability of the technique, Ca and P concentrations and to determine the ΔE variables and color change perception. Gingival irritation was analyzed by Fisher's Exact test. The total frequencies for each time interval (regardless of bleaching technique) were compared at 50% by the chi-square test. RESULTS: The in-office technique presented the lowest tooth sensitivity, but all techniques caused an increase in sensitivity over time (P< 0.0001). All techniques resulted in lower Ca and P concentrations in enamel at each time point, compared with the baseline concentrations. Calcium concentrations did not differ significantly among the treatments (P= 0.9360). Phosphorus concentration at the 8th day was higher for the in-office technique group (P< 0.05). All the bleaching techniques were effective in altering color, with ΔE values higher than 3.3, without any significant differences (P= 0.3255). Higher occurrence of gingival irritation was observed for at-home and combined techniques. The combined technique seemed to promote a color change faster than the other techniques. CLINICAL SIGNIFICANCE: All the dental bleaching techniques proved equally effective in promoting tooth color change. These techniques may reduce calcium and phosphorous content in enamel. The at-home and the combined techniques may cause greater dental sensitivity than the in-office technique, and led to a higher prevalence of gingival irritation.


Assuntos
Peróxido de Hidrogênio , Clareadores Dentários , Clareamento Dental , Descoloração de Dente , Esmalte Dentário , Humanos , Peróxido de Hidrogênio/uso terapêutico , Minerais , Clareamento Dental/métodos , Clareadores Dentários/uso terapêutico , Descoloração de Dente/tratamento farmacológico , Resultado do Tratamento
4.
Dental Press J Orthod ; 24(2): 66-72, 2019 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-31116289

RESUMO

OBJECTIVE: This study investigated the effect of the condition of lubrication on the friction between brackets and NiTi archwires of different rounded cross-sections. METHODS: Brackets (Roth, GAC) were affixed to a device connected to a universal testing machine into which segments of archwire were placed (NiTi, Nitinol, GAC) with cross-sections of 0.012-in, 0.016-in and 0.020-in. Once the wire was in the bracket slot, the following lubricants were applied: human saliva (HS: positive control), distilled water (DI), mucin-based (MUC) or carboxymethylcellulose-based (CMC) artificial saliva. In the negative control group, no lubricant was used. The combination between the wire cross-sections and the lubrication condition generated 15 groups with 15 samples each. Data were submitted to two-way analysis of variance and Tukey's test. RESULTS: There was no significant interaction between the wire cross-section and the condition of lubrication (p= 0.901). Irrespective of whether lubricants were used or not, there was a significant increase in friction with an increase in the cross-section of the wire (p< 0.001). For any wire, the group tested in the presence of MUC was not different from that in which HS was applied. On the other hand, when the application of lubricants was suppressed, significantly higher friction values were observed. The CMC group and the DI group demonstrated intermediate behavior. CONCLUSIONS: Friction increased with the increase of the cross-section of the NiTi archwire, but regardless of the archwire, friction with MUC artificial saliva was similar to that of HS and lower than in dry conditions.


Assuntos
Braquetes Ortodônticos , Ligas Dentárias , Fricção , Humanos , Teste de Materiais , Desenho de Aparelho Ortodôntico , Fios Ortodônticos , Aço Inoxidável , Propriedades de Superfície , Titânio
5.
Braz Oral Res ; 33: e044, 2019 May 27.
Artigo em Inglês | MEDLINE | ID: mdl-31141037

RESUMO

The aim of this study was to evaluate soluble and insoluble fluoride concentrations in commercial varnishes, and their remineralization effect on artificial caries enamel lesions using surface and cross-sectional microhardness evaluations. Forty bovine enamel blocks were separated into four groups (n=10): control (no treatment), Enamelast (Ultradent Products), Duraphat (Colgate-Palmolive) and Clinpro White Varnish (3M ESPE). Surface enamel microhardness evaluations were obtained, artificial enamel caries lesions were developed by dynamic pH-cycling, and the varnishes were then applied every 6 days, after which the enamel blocks were submitted to dynamic remineralization by pH cycles. After removal of the varnishes, the enamel surfaces were reassessed for microhardness. The blocks were sectioned longitudinally, and cross-sectional microhardness measurements were performed at different surface depths (up to 300 µm depth). Polarized light microscopy images (PLMI) were made to analyze subsurface caries lesions. The fluoride concentration in whole (soluble and insoluble fluoride) and centrifuged (soluble fluoride) varnishes was determined using an extraction method with acetone. The data were analyzed to evaluate the surface microhardness, making adjustments for generalized linear models. There was a significant decrease in enamel surface microhardness after performing all the treatments (p<0.0001). Enamelast and Duraphat showed significantly higher enamel microhardness values than the control and the Clinpro groups (p = 0.0002). Microhardness loss percentage was significantly lower for Enamelast (p = 0.071; One-way ANOVA). PLMI showed that subsurface caries lesions were not remineralized with the varnish treatments. No significant differences in the in-depth microhardness levels (p = 0.7536; ANOVA) were observed among the treatments. Enamelast presented higher soluble and insoluble fluoride concentrations than the other varnishes (p < 0.0001; Kruskal-Wallis and Dunn tests). Enamelast and Duraphat varnishes promoted enamel surface remineralization, but no varnish remineralized the subsurface lesion body. Although insoluble and soluble fluoride concentration values did not correspond to those declared by the manufacturer, Enamelast presented higher fluoride concentration than the others.


Assuntos
Cariostáticos/química , Cárie Dentária/tratamento farmacológico , Esmalte Dentário/efeitos dos fármacos , Fluoretos Tópicos/química , Remineralização Dentária/métodos , Análise de Variância , Animais , Bovinos , Testes de Dureza , Teste de Materiais , Microscopia de Polarização , Valores de Referência , Reprodutibilidade dos Testes , Estatísticas não Paramétricas , Propriedades de Superfície/efeitos dos fármacos , Fatores de Tempo
6.
Dental press j. orthod. (Impr.) ; 24(2): 66-72, Mar.-Apr. 2019. tab, graf
Artigo em Inglês | LILACS-Express | ID: biblio-1001855

RESUMO

Abstract Objective: This study investigated the effect of the condition of lubrication on the friction between brackets and NiTi archwires of different rounded cross-sections. Methods: Brackets (Roth, GAC) were affixed to a device connected to a universal testing machine into which segments of archwire were placed (NiTi, Nitinol, GAC) with cross-sections of 0.012-in, 0.016-in and 0.020-in. Once the wire was in the bracket slot, the following lubricants were applied: human saliva (HS: positive control), distilled water (DI), mucin-based (MUC) or carboxymethylcellulose-based (CMC) artificial saliva. In the negative control group, no lubricant was used. The combination between the wire cross-sections and the lubrication condition generated 15 groups with 15 samples each. Data were submitted to two-way analysis of variance and Tukey's test. Results: There was no significant interaction between the wire cross-section and the condition of lubrication (p= 0.901). Irrespective of whether lubricants were used or not, there was a significant increase in friction with an increase in the cross-section of the wire (p< 0.001). For any wire, the group tested in the presence of MUC was not different from that in which HS was applied. On the other hand, when the application of lubricants was suppressed, significantly higher friction values were observed. The CMC group and the DI group demonstrated intermediate behavior. Conclusions: Friction increased with the increase of the cross-section of the NiTi archwire, but regardless of the archwire, friction with MUC artificial saliva was similar to that of HS and lower than in dry conditions.


Resumo Objetivo: este estudo investigou o efeito das condições de lubrificação no atrito entre braquetes e fios de NiTi de diferentes secções transversais. Métodos: os braquetes (Roth, GAC) foram fixados a um dispositivo conectado a uma máquina de ensaio universal, que recebeu segmentos de fio de NiTi (Nitinol, GAC) com secções de 0,012"; 0,016" ou 0,020". Após o fio ter sido instalado no slot do braquete, aplicou-se um dos seguintes lubrificantes: saliva humana (SH: controle positivo), água destilada (AD) ou saliva artificial à base de mucina (MUC) ou de carboximetilcelulose (CMC). No grupo controle negativo, nenhum lubrificante foi utilizado. As combinações entre as secções dos fios e as condições de lubrificação geraram 15 grupos, com 15 amostras cada. Os dados foram submetidos à análise de variância a dois critérios e ao teste de Tukey. Resultados: não houve interação significativa entre a secção do fio e a condição de lubrificação (p = 0,901). Independentemente de ter sido utilizado ou não lubrificante, observou-se elevação significativa do atrito com o aumento da secção transversal do fio (p < 0,001). Para qualquer um dos fios, o grupo testado na presença de MUC não diferiu daquele em que se aplicou SH. Por outro lado, quando suprimiu-se os lubrificantes, constatou-se atrito significativamente mais elevado. Os grupos CMC e AD demonstraram comportamento intermediário. Conclusões: o atrito se elevou com o aumento da secção transversal dos fios de NiTi, mas a despeito do fio, o atrito com a saliva à base de MUC foi similar àquele com a SH e menor do que sob condição a seco.

7.
Oral Health Prev Dent ; 17(1): 57-67, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30793123

RESUMO

PURPOSE: To apply titanium tetrafluoride (TiF4) in an aqueous solution or incorporated into the primer of a self-etching adhesive (Clearfil SE Bond) as dentin pre-treatment and evaluate its antimicrobial effect, determine the minimum bactericidal concentraion (MBC) against Streptococcus mutans and Lactobacillus casei and analyse its potential to inhibit the development of carious lesions at the restoration interface. MATERIALS AND METHODS: For MBC, an aqueous solution or primer with different concentrations (in %) of TiF4 were used (from 0.0 to 4.0). Also, 50 cavities were prepared at the enamel/dentin junction of third molars and received the following dentin pre-treatments (n = 10): Clearfil SE Bond (CL); aqueous solution of 2.5% TiF4 + CL (T2.5%); aqueous solution of 4% TiF4 + CL (T4%); 2.5% TiF4 incorporated into the primer (P2.5%); 4% TiF4 incorporated into the primer (P4%). Cavities were restored and submitted to pH cycling to create artificial caries lesions. Microhardness tests were performed after sectioning the restorations to assess the demineralisation at margins. RESULTS: ANOVA and Tukey's tests showed that TiF4 in aqueous solution presented MBC against S. mutans and L. casei of over 2.0%. TiF4 in the primer of a self-etching adhesive presented MBC of over 1% for L. casei. For enamel, CL showed no significant differences in microhardness between the depths. CONCLUSIONS: The aqueous solution had an antimicrobial effect against Streptococcus mutans and Lactobacillus casei of over 2.0%. Pretreatment with the aqueous solution or primer did not inhibit demineralisation at enamel or dentin restoration interfaces.


Assuntos
Anti-Infecciosos , Colagem Dentária , Resinas Compostas , Esmalte Dentário , Dentina , Adesivos Dentinários , Fluoretos , Teste de Materiais , Titânio
8.
J Mech Behav Biomed Mater ; 91: 398-405, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30669058

RESUMO

Hydrolytic and enzymatic degradation by matrix metalloproteinases (MMPs) reduces the durability of composite resin restorations on caries-affected dentin (CAD). The use of MMP inhibitors such as epigallocatechin-3-gallate (EGCG) could increase the longevity of the bond to dentin. This study aimed to evaluate the use of EGCG at different aqueous concentrations on the resin-dentin microtensile bond strength (µTBS), fracture pattern and nanoleakage (NL) in immediate (IM) time interval and after 12-months of water storage (1Y) when using a two-step etch-and-rinse adhesive system on CAD. Dentin surfaces of 40 human molars were submitted to a microbiological caries induction protocol and randomized into 5 groups (n = 8) (0.02% EGCG; 0.2% EGCG; 0.5% EGCG; 2% Chlorhexidine [CHX] and no treatment as Control Group - [NT]). After acid etching, the solutions were applied for 60 s followed by application of dental adhesive (Adper Single Bond 2, 3 M ESPE) to CAD surfaces. Subsequently, a resin composite (4 mm) block was built on the dentin. After 24 h, the teeth were sectioned into beam-shaped specimens (cross-sectional area of 1 mm2 and 8-mm high). Half of the specimens were tested in IM and the other half after 1Y. Two samples per tooth were submitted to SEM for NL evaluation. Data were statistically analyzed by two-way ANOVA and Tukey tests (α = 0.05). The results showed that use of EGCG and CHX did not affect µTBS in IM (p > 0.05). After 1Y, there was a reduction in µTBS for all experimental groups (p < 0.05). Adhesive fractures predominated in IM in all groups, except for 0.05% EGCG and NT. After 1Y, there was an increase in these adhesive fractures in all groups. For NL, all agents applied reduced NL in comparison with CT (p < 0.001). CHX showed lower NL (p < 0.001), followed by 0.02% and 0.5% EGCG. NT showed highest NL for both time intervals (p < 0.001). Thus, although the use of EGCG at different concentrations and CHX reduced the NL, they were unable to reduce degradation of µTBS to CAD over time.

9.
J Prosthodont ; 28(1): e59-e67, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28872728

RESUMO

PURPOSE: To evaluate shade stability, surface roughness, microhardness, and compressive strength of a glazed feldspathic ceramic subjected to bleaching and simulated brushing. MATERIALS AND METHODS: Eighty-eight glazed feldspathic ceramic specimens were made from microparticulate leucite and divided into eight groups (n = 10). The whitening products used were: Opalescence Trèswhite Supreme (Ultradent), Opalescence®\ PF 15% (Ultradent), and Oral-B 3D White Whitestrips. All substances for whitening were used for 4 hours/day for a period of 14 days; the control group was not bleached. Next, half of the specimens were individually brushed. Microhardness and surface roughness data were subjected to three-way ANOVA and Tukey test. The diametrical tensile strength data were subjected to two-way ANOVA. The shade change data were analyzed using Kruskal-Wallis, Mann-Whitney, and the Student-Newman-Keuls test. The significance level was set at 5%. RESULTS: Glazed feldspathic ceramic surface microhardness was significantly affected by bleaching agents (p = 0.007). Initially, glazed ceramic microhardness was significantly higher than that observed after contact with the bleaching agents, whether or not brushing was performed. The specimens submitted to bleaching in preloaded trays presented lower surface roughness values after brushing (p = 0.037). The surface roughness was significantly lower in the brushed specimens (p = 0.044). The diametrical tensile strength was not significantly affected by the application of bleaching agents (p = 0.563) or by brushing (p = 0.477). When the specimens were brushed, however, shade change was significantly influenced by the bleaching agent used (p = 0.041). CONCLUSIONS: Bleaching agents associated with brushing cycles can alter surface properties and shade stability of glazed feldspathic ceramics, though such findings may not reflect the performance of unglazed feldspathic ceramics.


Assuntos
Cerâmica , Materiais Dentários , Pigmentação em Prótese , Clareadores Dentários , Cerâmica/química , Força Compressiva , Materiais Dentários/química , Dureza , Propriedades de Superfície , Resistência à Tração , Clareamento Dental/efeitos adversos , Clareadores Dentários/farmacologia , Escovação Dentária/efeitos adversos
10.
Braz. oral res. (Online) ; 33: e044, 2019. tab, graf
Artigo em Inglês | LILACS-Express | ID: biblio-1001614

RESUMO

Abstract: The aim of this study was to evaluate soluble and insoluble fluoride concentrations in commercial varnishes, and their remineralization effect on artificial caries enamel lesions using surface and cross-sectional microhardness evaluations. Forty bovine enamel blocks were separated into four groups (n=10): control (no treatment), Enamelast (Ultradent Products), Duraphat (Colgate-Palmolive) and Clinpro White Varnish (3M ESPE). Surface enamel microhardness evaluations were obtained, artificial enamel caries lesions were developed by dynamic pH-cycling, and the varnishes were then applied every 6 days, after which the enamel blocks were submitted to dynamic remineralization by pH cycles. After removal of the varnishes, the enamel surfaces were reassessed for microhardness. The blocks were sectioned longitudinally, and cross-sectional microhardness measurements were performed at different surface depths (up to 300 μm depth). Polarized light microscopy images (PLMI) were made to analyze subsurface caries lesions. The fluoride concentration in whole (soluble and insoluble fluoride) and centrifuged (soluble fluoride) varnishes was determined using an extraction method with acetone. The data were analyzed to evaluate the surface microhardness, making adjustments for generalized linear models. There was a significant decrease in enamel surface microhardness after performing all the treatments (p<0.0001). Enamelast and Duraphat showed significantly higher enamel microhardness values than the control and the Clinpro groups (p = 0.0002). Microhardness loss percentage was significantly lower for Enamelast (p = 0.071; One-way ANOVA). PLMI showed that subsurface caries lesions were not remineralized with the varnish treatments. No significant differences in the in-depth microhardness levels (p = 0.7536; ANOVA) were observed among the treatments. Enamelast presented higher soluble and insoluble fluoride concentrations than the other varnishes (p < 0.0001; Kruskal-Wallis and Dunn tests). Enamelast and Duraphat varnishes promoted enamel surface remineralization, but no varnish remineralized the subsurface lesion body. Although insoluble and soluble fluoride concentration values did not correspond to those declared by the manufacturer, Enamelast presented higher fluoride concentration than the others.

11.
Arch Oral Biol ; 94: 16-26, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-29929070

RESUMO

OBJECTIVE: Investigate the long-term effect of dentin pretreatment with 0.05 or 0.1% caffeic acid phenethyl ester (CAPE) on (1) bond strength of resin composite to dentin by a three-step etch-and-rinse (Adper Scotchbond Multipurpose/ ASB) or a two-step self-etch adhesive system (Clearfil SE Bond/ CSE), (2) their fracture mode, (3) the micromorphological features of the hybrid layer formed; and (4) the level of MMP-2 in dentin (after application, using a correlative immunoexpression/quantification approach). DESIGN: Composite resin blocks were fabricated on 48 third molars (n = 6), according to the type of adhesive and treatment (control, CAPE 0.05% and CAPE 0.1%). Slices were obtained for scanning electron microscopy (SEM) evaluation, and sticks were fabricated for microtensile tests (24 h and 1 year). Aliquots of dentin powder were distributed (n = 12) according to the treatment and the MMP-2 concentration was determined by ELISA. RESULTS: Tukey test showed that ASB groups presented higher BS in 24 h than CSE groups. ASB presented a reduction in BS values after 1-year. ASB and CSE presented no significant differences in BS after 1-year. CAPE had no effect on BS for both adhesive systems. The predominant failure mode for the ASB groups were adhesive; when 0.1% CAPE was applied there was a predominance of mixed fractures. Regarding the CSE group, 0.05% CAPE led to more adhesive failures, and the 0.1% concentration resulted in a higher number of cohesive failures in dentin. Higher MMP-2 concentrations were detected for the groups that did not undergo demineralization treatment, and the lowest values for the ASB groups treated with CAPE. SEM analysis showed no influence of pretreatment with CAPE. CONCLUSIONS: CAPE did not influence the BS of the adhesives tested, or the micromorphology of the hybrid layer, irrespective of concentration or storage time. CAPE affected the fracture pattern at 24 h, depending on the concentration and the adhesive system used. Immunoassay analysis showed that CAPE 0.1% reduced the MMP-2 concentration in the ASB adhesive without affecting bond strength to dentin.


Assuntos
Condicionamento Ácido do Dente/métodos , Ácidos Cafeicos/farmacologia , Colagem Dentária , Adesivos Dentinários/química , Dentina/efeitos dos fármacos , Metaloproteinase 2 da Matriz/efeitos dos fármacos , Álcool Feniletílico/análogos & derivados , Resistência à Tração , Análise de Variância , Resinas Compostas/química , Cimentos Dentários , Falha de Restauração Dentária , Dentina/ultraestrutura , Cimentos de Ionômeros de Vidro/química , Humanos , Técnicas In Vitro , Teste de Materiais , Microscopia Eletrônica de Varredura , Dente Serotino , Álcool Feniletílico/farmacologia , Cimentos de Resina , Estresse Mecânico , Propriedades de Superfície
12.
Clin Oral Investig ; 22(9): 2989-2996, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29453496

RESUMO

OBJECTIVES: The aim of this study was to evaluate the clinical performance of silorane-based composite restorations applied after different surface treatments. MATERIALS AND METHODS: This controlled and randomized clinical trial included 26 patients with class I restoration indications. The teeth were randomly assigned to the following treatments: control 1/G1, silorane specific self-etching adhesive (P90 self-etch primer and bond) + silorane-based composite resin (Filtek™ P90 low shrink posterior restorative); G2, 37% phosphoric acid + silorane specific self-etching adhesive + silorane-based composite resin; G3, blasting with aluminum oxide + silorane specific self-etching adhesive + silorane-based composite resin; and control 2/G4, self-etching adhesive (Adper™ SE Plus self-etch adhesive) + dimethacrylate-based composite resin (Filtek™ P60 posterior restorative). The clinical performance was evaluated at baseline and after 1 year. RESULTS: A total of 141 restorations were made and evaluated. For all clinical criteria evaluated, no significant difference was found between the surface treatments at baseline and after 1 year (p > 0.05). After 1 year, only the group with 37% phosphoric acid + silorane specific self-etching adhesive (G2) showed a significant reduction in marginal adaptation (p < 0.05). CONCLUSION: In general, all surface treatments showed an adequate clinical performance for silorane-based composite resin in class I restorations. However, a reduction in the marginal adaptation after 1 year was found when additional phosphoric acid etching was used prior to silorane specific self-etching adhesive. CLINICAL RELEVANCE: The use of phosphoric acid etching prior to specific self-etching adhesive can adversely affect the marginal adaptation of silorane-based restorations.


Assuntos
Resinas Compostas/química , Cárie Dentária/terapia , Restauração Dentária Permanente/métodos , Adesivos Dentinários/química , Resinas de Silorano/química , Condicionamento Ácido do Dente/efeitos adversos , Adolescente , Adulto , Método Duplo-Cego , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Propriedades de Superfície , Resultado do Tratamento
13.
Pesqui. bras. odontopediatria clín. integr ; 18(1): 3866, 15/01/2018. ilus, graf, tab
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-965740

RESUMO

Objective: This randomized controlled crossover clinical trial monitored the kinetics of salivary pH over time following the consumption of sour gummy candy. Material and Methods: Twenty participants underwent saliva assessment for flow, pH and buffer capacity. Following a two-arm crossover layout, the participants chewed a piece of a sour and a piece of an ordinary (control) gummy candy for 20 seconds. Participants expectorated saliva at 18 time points: immediately after ingesting the candies; then after every 15 second interval, for up to 1 minute; 30 seconds up to 4 minutes; 60 seconds up to 10 minutes; and at 15 minutes. The pH of the collected samples was measured with a pH microelectrode. The data concerning the pH measurements of the whole saliva samples collected over time following chewing of sour and ordinary gummy candies underwent repeated-measures three-way analysis of variance (ANOVA) using a significance level of 5%. Results: Repeated-measures three-way analysis of variance demonstrated a significant interaction between the type of candy and time (p<0.001). Tukey's test revealed that with the consumption of sour gummy candy, the salivary pH showed an initial marked exponential drop and remained lower than that observed with the consumption of the ordinary version for up to 120 seconds. Conclusion: The consumption of sour gummy candy induces a major, transient fall in salivary pH, which may represent a risk factor for dental erosion.


Assuntos
Humanos , Saliva/metabolismo , Desgaste dos Dentes , Concentração de Íons de Hidrogênio , Brasil , Análise de Variância
14.
Int J Periodontics Restorative Dent ; 38(5): 711­717, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29244885

RESUMO

This study evaluated the influence of timing after endodontic treatment and type of resin cement used on the bond strength of fiber posts to epoxy resin-obturated canals. A total of 80 bovine incisor roots were divided into four groups (n = 20). Glass fiber posts were cemented at two different times, immediately or 7 days after endodontic treatment, using either a dual-curing resin cement (RelyX ARC, 3M ESPE) or a self-adhesive resin cement (RelyX U200, 3M ESPE). Following post cementation, the samples were cross-sectioned into slices containing root dentin, cement, and fiber post at the cervical, mid, and apical root thirds. The push-out test was performed on a universal testing machine. Three-way analysis of variance for randomized blocks showed no significant effect within the triple interaction (P = .394) or between the double interactions cement-timing (P = .395), cement-root thirds (P = .996), and timing-root thirds (P = .331). The main factor cement revealed a significant effect, showing that regardless of the timing and root third, RelyX ARC provided significantly higher bond strength values than U200. Regardless of root third and timing, the dual-curing resin cement showed higher bond strength to root dentin when the canals were filled with epoxy resin-based cement.


Assuntos
Resinas Epóxi/uso terapêutico , Técnica para Retentor Intrarradicular , Cimentos de Resina/uso terapêutico , Materiais Restauradores do Canal Radicular/uso terapêutico , Obturação do Canal Radicular , Animais , Bis-Fenol A-Glicidil Metacrilato/uso terapêutico , Bovinos , Colagem Dentária/métodos , Técnicas In Vitro , Polietilenoglicóis/uso terapêutico , Ácidos Polimetacrílicos/uso terapêutico , Preparo de Canal Radicular/métodos , Fatores de Tempo
15.
Arch Oral Biol ; 86: 51-57, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29172111

RESUMO

OBJECTIVE: Investigate the effects of dentin pretreatment with 2.5% titanium tetrafluoride (TiF4) aqueous solution followed by two-step self-etching (CLE/Clearfil SE Bond) and one-step self-etching adhesive systems (SBU/Single Bond Universal) on carious lesion inhibition at the tooth-restoration interface using an in situ model. DESIGN: Sixty-four cavities at the enamel-dentin junction of dental fragments were randomly distributed according to groups (n=16): 1) TiF4+CLE; 2) TiF4+SBU; 3) CLE; 4) SBU. Cavities were restored using resin composite, and placed in intraoral palatal devices used by 16 volunteers for 21days, to induce caries formation in situ. The fragments were then ground-flat to perform Knoop microhardness tests. Nine indentations were performed on each enamel and dentin substrate, subjacent to the restoration. Analysis of variance and Tukey's test were applied. RESULTS: Enamel: groups receiving TiF4 dentin pretreatment (regardless of adhesive system and tooth-restoration interface distance) presented higher hardness means at a depth of 25µm from the outer tooth surface (p<0.0001). Dentin: groups receiving CLE presented higher means when applying TiF4 pretreatment, whereas groups restored with SBU presented higher means without pretreatment (p=0.0003). CONCLUSIONS: Dentin pretreatment with TiF4 inhibited demineralization of the enamel interface in situ, regardless of the adhesive, and TiF4 pretreatment followed by CLE application showed higher potential for inhibiting dentin demineralization at the interface.


Assuntos
Cariostáticos/farmacologia , Cárie Dentária/prevenção & controle , Restauração Dentária Permanente , Dentina/efeitos dos fármacos , Fluoretos/farmacologia , Titânio/farmacologia , Desmineralização do Dente/prevenção & controle , Bis-Fenol A-Glicidil Metacrilato , Resinas Compostas/farmacologia , Testes de Dureza , Humanos , Técnicas In Vitro , Dente Serotino , Cimentos de Resina , Propriedades de Superfície
16.
Rev. ABENO ; 18(4): 58-63, 2018. graf
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-988285

RESUMO

A diversificação das práticas pedagógicas visa o aprimoramento do processo de ensino. Novas metodologias, que favoreçam o interesse dos alunos e que proporcionem melhor compreensão, podem ser ferramentas importantes no processo ensino-aprendizagem. O objetivo desse estudo foi avaliar a percepção dos estudantes sobre o uso de macromodelos odontológicos, confeccionados com impressora 3D, como recurso complementar de ensino na disciplina Escultura Dentária, no curso de graduação em Odontologia da FACIPLAC. A amostra foi composta por 44 estudantes, matriculados no quinto período. Foram produzidos 44 conjuntos com quatro macromodelos, sendo um incisivo central, um canino, um primeiro pré-molar e um primeiro molar, todos superiores, confeccionados em material plástico colorido e resistente. Os conjuntos foram entregues aos estudantes no início de cada aula e utilizados para demonstração das estruturas anatômicas, visando à melhor fixação do conhecimento, sendo recolhidos posteriormente. Ao final do semestre letivo foi aplicado um questionário relativo ao aproveitamento do uso dos macromodelos, com resposta de 38 estudantes. Os resultados indicam que o uso dos macromodelos foi válido como recurso facilitador da compreensão da técnica de escultura dentária; contribuindo com o processo de aprendizagem em comparação ao uso de diapositivos; destacando as dificuldades no aprendizado; auxiliando na sedimentação dos conceitos das formas geométricas das estruturas dentárias. Os estudantes indicam seu uso, contudo consideram que não substitui a demonstração prática pelo docente (AU).


The diversification of pedagogical practices aimed at improving the teaching process. New methodologies, which favor the interests of tudents and to provide better understanding, can be important tools in the teaching and learning process. The aim of this study was to evaluate the perception of undergraduate dental students regarding the use of 3D-printed dental models as an additional resource for teaching dental sculpture at FACIPLAC. The sample consisted of 44 students enrolled in the fifth semester. A total of 44 sets were printed using four threedimensional models: maxillary central incisor, canine, first premolar and first molar, printed in plastic, resistant and colorful material. The sets were delivered to students at the beginning of each class and used to demonstrate the anatomical structures, collected at the end of the class, for improved memorization of knowledge. A questionnaire was applied regarding the use of the 3D models at the end of the school semester, and 38 answers were obtained. The research results indicated that the use of 3D models was a valid resource for facilitating technical understanding of dental sculpture; improved the learning process when compared to the use of slideshows; identified areas of greater difficulty in learning; contributed to the memorization of concepts and geometric shapes of tooth structures. Although students approved the use of 3D models, they did not replace practical demonstration (AU).


Assuntos
Humanos , Masculino , Feminino , Estudantes de Odontologia , Modelos Dentários , Educação em Odontologia , Impressão Tridimensional/instrumentação , Brasil , Inquéritos e Questionários
17.
Braz. j. oral sci ; 16: e17069, jan.-dez. 2017. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-884306

RESUMO

Aim: To assess the effect of a mouthwash containing hydrogen peroxide (HP) on Knoop microhardness (KMH) of bovine enamel. Methods: Fifty-one enamel slabs were polished and divided into groups (n=17), according to the product used during 28 days: HP ­ mouthwash containing 1,5% of HP (4 min, once/day); CP - 10% carbamide peroxide gel (2 hours/day); AS - no treatment (kept in artificial saliva (AS). Each fragment was submitted to KMH test (three indentations/fragment, with a 50 g load for 5 sec) four times: before (baseline); during (14 and 28 days) and after (7 days immerged in AS) the bleaching treatment. The data were submitted to repeated-measures two-way ANOVA (α=0.05). Results: There was no effect of the interaction between the time and treatment factors (p=0.327). No significant effect was observed from the time factor (p = 0.054). The factor treatment showed significant effect (p =0.002). Regardless of time, the KMH of the enamel submitted to HP was lower than the value observed with the use of CP, which did not differ significantly from the control group (AS). Conclusion: Although there was a trend of decreasing enamel microhardness over time, only the mouthwash containing hydrogen peroxide had a significant effect (AU)


Assuntos
Animais , Bovinos , Testes de Dureza , Peróxido de Hidrogênio , Antissépticos Bucais , Saliva Artificial , Clareamento Dental
18.
Dent Mater ; 33(10): 1157-1170, 2017 10.
Artigo em Inglês | MEDLINE | ID: mdl-28781068

RESUMO

OBJECTIVES: To evaluate the bond strength to superficial (SD) and deep (DD) dentin after the use of 2.5% (T2.5%) or 4% (T4%) titanium tetrafluoride (TiF4) in aqueous solution as a dentin pretreatment, or when incorporated into the primer (T2.5%P and T4%P) of an adhesive system (Clearfil SE Bond/CL). Degree of conversion (DC), particle size (PS), polydispersity index (PI) and zeta potential (ZP) of the solutions were evaluated. METHODS: Fifty molars were sectioned longitudinally to obtain two slices of each tooth, which were demarcated into SD and DD. Treatments were applied (n=10): CL; T2.5%; T4%; T2.5%P; T4%P. After 24h or 180days storage, microshear bond strength tests were performed. The DC values of T2.5%P and T4%P were evaluated by FTIR. PS, PI and ZP were measured using dynamic light scattering. RESULTS: Analysis of mixed models showed significant effect of concentration of TiF4 * solution * storage time (p=0.0075). There were higher bond strength values in SD than in DD (p=0.0105) for all treatments in both times. The failure mode showed adhesive failures in the majority of groups, irrespective of depth and time (p=0.3746). The bond strength values were not affected by treatments. Lower average particle size was observed for T2.5%P and T4%P at baseline. T2.5% and T4% showed a trend towards agglomeration. SIGNIFICANCE: Higher bond strength values were achieved at SD for all treatments and times. The failure modes observed were adhesive. TiF4 incorporation did not affect DC. T2.5%P and T4%P presented excellent stability over time.


Assuntos
Colagem Dentária , Dentina , Cimentos de Resina , Cimentos Dentários , Adesivos Dentinários , Fluoretos , Humanos , Teste de Materiais , Resistência à Tração , Titânio
19.
J Mech Behav Biomed Mater ; 75: 197-205, 2017 11.
Artigo em Inglês | MEDLINE | ID: mdl-28750301

RESUMO

OBJECTIVES: To evaluate the influence of TiF4 incorporated into the primer (P) or bond (B) of a self-etching adhesive system on long-term dentin bonding, and evaluate the physico-mechanical properties of TiF4-containing adhesives. METHODS: Dentin surfaces received the following treatments (n = 8): CL (Clearfil SE Bond); TiF4CL (dentin pretreatment with TiF4 aqueous solution + CL); TiF4P (TiF4 incorporated into the P); TiF4B (TiF4 incorporated into the B). Microtensile bond strength (µTBS) and failure mode evaluations were performed after 24h, 6 months and one year, respectively. Degree of conversion (DC) and flexural strength (FS) were evaluated to determine whether TiF4 influenced adhesive properties. Particle size (PS), polydispersity index (PI) and zeta potential (ZP) of TiF4-containing adhesives were measured using dynamic light scattering. Two-way ANOVA for repeated measures was applied to µTBS data, and one-way ANOVA and Tukey tests to DC and FS results. RESULTS: There was no difference in µTBS among the groups (p = 0.818) regardless of time; the µTBS in each group was not significantly affected over time (p = 0.061). TiF4P and TiF4B significantly affected FS (p = 0.004). The DC for TiF4P was not significantly different from that of CL, and higher than that of TiF4B. Lower average particle size was observed for TiF4P at baseline. TiF4 aqueous solution showed a tendency to agglomerate. CONCLUSIONS: TiF4-containing adhesives did not influence µTBS or failure mode to dentin over time, although FS and DC were affected, especially when TiF4 was incorporated into the B. TiF4P presented excellent stability over time.


Assuntos
Condicionamento Ácido do Dente , Colagem Dentária , Adesivos Dentinários , Fluoretos/análise , Titânio/análise , Resinas Compostas , Análise do Estresse Dentário , Dentina , Humanos , Teste de Materiais , Cimentos de Resina , Resistência à Tração
20.
Int J Implant Dent ; 3(1): 18, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28474322

RESUMO

BACKGROUND: It is still unclear whether enamel matrix proteins (EMD) as adjunct to bone grafting enhance bone healing. This study compared histomorphometrically maxillary sinus floor augmentation (MSFA) with ß-TCP/HA in combination with or without EMD in humans. METHODS: In ten systemically healthy patients needing bilateral MSFA, one side was randomly treated using ß-TCP/HA mixed with EMD (BC + EMD) and the other side using only ß-TCP/HA (BC). After 6 months, biopsies were harvested from grafted areas during implant installation, being histologically and histomorphometrically analyzed. Differences between the groups considering new bone formation, soft tissues, and remaining BC were statistically evaluated. RESULTS: All patients showed uneventful healing after MSFA, and dental implant installation was possible in all patients after 6 months. Histological analysis showed newly formed bone that was primarily woven in nature; it was organized in thin trabeculae, and it was occasionally in contact with residual bone substitute particles, which appeared in various forms and sizes and in advanced stage of degradation. Mean bone area was 43.4% (CI95 38.9; 47.8) for the BC group and 43.0% (CI95 36.6; 49.5) for the BC + EMD group. Mean soft tissue area was 21.3% (CI95 16.5; 26.2) for BC group and 21.5% (CI95 17.7; 25.3) for BC + EMD group, while the remaining biomaterial was 35.3% (CI95 36.6; 49.5) and 35.5% (CI95 29.6; 41.3) for BC and BC + EMD group, respectively. CONCLUSIONS: MSFA with BC resulted in adequate amounts of new bone formation allowing successful implant installation; adding EMD did not have a significant effect.

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