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1.
J Adhes Dent ; 23(2): 159-165, 2021 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-33825429

RESUMO

PURPOSE: To evaluate the effect of inclusion of two dimethyl sulfoxide (DMSO) concentrations in simplified etch-and-rinse adhesives on dentin bonding durability after three years of water storage. MATERIALS AND METHODS: Forty-two caries-free third molars were divided into six experimental groups (n = 7) according to the following factors: 1) adhesive (Adper Single Bond 2 [SB], 3M Oral Care; Prime&Bond 2.1 [PB], Dentsply Sirona); 2) concentration of DMSO (control group: 0.0% DMSO; addition of 0.2% DMSO [0.2] and 2% DMSO [2.0]). After completing restoration, specimens were stored in water (37°C) for 24 h, sectioned into adhesive-dentin sticks (0.8 mm2), tested for microtensile bond strength (µTBS) at 0.5 mm/min, and examined for nanoleakage (NL) using SEM immediately thereafter or after three years of water storage. Data were subjected to a three-way repeated-measures ANOVA and Tukey's test (α = 0.05) for each property evaluated. RESULTS: After three years of water storage, for both adhesives, the incorporation of 2% DMSO maintained the µTBS when compared to immediate µTBS (p > 0.05). In general, SB resulted in a statistically significantly higher mean of µTBS compared to PB, independent of the DMSO concentration after water storage (p < 0.05). Furthermore, the amount of NL was lower and practically limited to the hybrid layer given the concentrations of 0.2% and 2% DMSO for both tested adhesives after three years. CONCLUSION: The incorporation of DMSO in simplified etch-and-rinse adhesives maintains the long-term stability of the dentin bond.


Assuntos
Colagem Dentária , Adesivos Dentinários , Dentina , Dimetil Sulfóxido , Teste de Materiais , Cimentos de Resina , Resistência à Tração , Água
2.
Clin Cosmet Investig Dent ; 12: 61-70, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32161504

RESUMO

Background: When a phosphoric acid is used, before applying an adhesive system, it is known that obtaining an effective adhesion to the root canal walls is a challenge. The aim of the present study was to evaluate the influence of phosphoric acid viscosity and application mode on the push-out bond strength (BS) values of fiberglass post to root dentin. The conditioning pattern on the root dentin was also evaluated. Materials and Methods: The roots of 44 endodontically treated premolars were divided into 4 groups, of eleven teeth each, according to the combination of the main factors: phosphoric acid viscosity (liquid or gel) and application mode (passive or sonic). After application of the two-step etch-and-rinse adhesive system, the fiberglass posts were cemented with a dual-cure resin-cement. Roots were sectioned transversely into six 1-mm slices for push-out BS test at 0.5 mm/min. Some roots of each group were selected for evaluation of the conditioning pattern by scanning electron microscopy. BS results (three-way ANOVA and Tukey's test) and the conditioning pattern (Kruskal-Wallis test and Mann-Whitney test) were statistically evaluated (α= 0.05). Results: The highest BS value was observed with a liquid phosphoric acid under sonic application mode (p < 0.05), being all other groups similar to one another (p < 0.05). Also, the highest BS value was observed in the cervical third, followed by the medium and the apical thirds (p < 0.05). The sonic application produced better smear layer removal and opening of dentinal tubules for both viscosities (p = 0.015). Conclusion: A better bonding of fiberglass posts to root canals can be achieved when the post spaces are conditioned with a liquid phosphoric acid under sonic application.

3.
Sci Rep ; 9(1): 3457, 2019 03 05.
Artigo em Inglês | MEDLINE | ID: mdl-30837573

RESUMO

Hydrogen peroxide (H2O2)-based products are effective in tooth whitening; however, their safety is controversial as they may harm patient tissues/cells. These effects are suggested to be concentration-dependent; nonetheless, to date, there are no reports on H2O2-mediated oxidative damage in the gingival tissue, and neither whether this can be detected in gingival crevicular fluid (GCF) samples. We hypothesize that H2O2 whitening products may cause collateral oxidative tissue damage following in office application. Therefore, H2O2 and nitric oxide (NO) levels were investigated in GCF samples obtained from patients undergoing dental bleaching with H2O2 at different concentrations, in a randomized, double-blind, split-mouth clinical trial. A proteomic analysis of these samples was also performed. H2O2-based whitening products promoted inflammation which was detected in GCF samples and lasted for longer following 35% H2O2 bleaching. This included time-dependent changes in NO levels and in the abundance of proteins associated with NO synthesis, oxidative stress, neutrophil regulation, nucleic acid damage, cell survival and/or tissue regeneration. Overall, H2O2-based products used in office promote inflammation irrespective of their concentration. As the inflammation caused by 35% H2O2 is longer, patients may benefit better from using lower concentrations of this bleaching product, as they may result in less tissue damage.


Assuntos
Líquido do Sulco Gengival/metabolismo , Peróxido de Hidrogênio/metabolismo , Peróxido de Hidrogênio/farmacologia , Clareadores Dentários/metabolismo , Clareadores Dentários/farmacologia , Relação Dose-Resposta a Droga , Feminino , Voluntários Saudáveis , Humanos , Peróxido de Hidrogênio/administração & dosagem , Masculino , Neutrófilos/imunologia , Neutrófilos/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Clareamento Dental , Clareadores Dentários/administração & dosagem
4.
J Contemp Dent Pract ; 19(9): 1072-1075, 2018 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-30287706

RESUMO

INTRODUCTION: This study aimed to assess the eruption of impacted teeth in cleft lip and/or palate (CLP) after alveolar bone graft. MATERIALS AND METHODS: Research was carried out through a cross-sectional study at the Craniofacial Rehabilitation Center of the University General Hospital of the University of Cuiabá, Mato Grosso, Brazil. Variables related to cleft, cleft side, gender, age, laterality of cleft, impacted teeth, and orthodontic traction were analyzed. RESULTS: Forty-two patients treated at the institution from 2004 to 2011 had their charts retrospectively reviewed. They were 54.7% male and 45.2% female. The group aged 9 to 11 years was most affected, representing 59.5% of cases. A unilateral cleft was the most prevalent craniofacial anomaly (85.7%). A total of 57 impacted teeth were observed. Maxillary canines were the most commonly impacted teeth (97.6%) and the most frequently identified in patients with a transforamen incisor cleft (TIC) (76.3%). Orthodontic traction was required for both impacted maxillary canines and impacted lateral incisors (64.3 and 35.7% respectively). The orthodontic traction was required only in patients with a TIC (p = 0.0101). CONCLUSION: The canine teeth were the most commonly impacted teeth, found mainly in patients with a TIC. After placement of the alveolar bone graft in patients with a preforamen incisor cleft (PIC), all impacted teeth erupted spontaneously. CLINICAL SIGNIFICANCE: An impacted tooth can have negative consequences on a patient's quality of life. Thus, a survey evaluating the incidence and prognosis of impacted teeth after an alveolar bone graft for CLP was important.


Assuntos
Enxerto de Osso Alveolar , Fenda Labial/epidemiologia , Fenda Labial/fisiopatologia , Fissura Palatina/epidemiologia , Fissura Palatina/fisiopatologia , Erupção Dentária , Dente Impactado/epidemiologia , Dente Impactado/fisiopatologia , Fatores Etários , Brasil/epidemiologia , Criança , Dente Canino , Feminino , Humanos , Incidência , Masculino , Prognóstico , Fatores Sexuais
5.
J Contemp Dent Pract ; 19(8): 904-909, 2018 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-30150487

RESUMO

AIM: To evaluate the antibacterial effect of diode laser, associated or not with 2.5% sodium hypochlorite (NaOCl), against Enterococcus faecalis. MATERIALS AND METHODS: Eighty dentin blocks were obtained from single-rooted human teeth and sterilized. Seventy were inoculated with 0.01 mL of fresh bacterial inoculum (within 24 hours of preparation from pure culture) standardized to 1 McFarland turbidity. Contaminated blocks were incubated for 7 days at 37°C in humid conditions. Ten uncontaminated samples were incubated at 37°C during the contamination period to serve as a negative control group, while 10 of the infected specimens served as a positive control group. The dentin blocks were randomly divided into eight experimental groups (n = 10 each) according to the method of decontamination: 2.5% NaOCl alone; 2.5% NaOCl + photodynamic therapy (PDT) with methylene blue/660 nm laser at 18 J for 180 seconds; 2.5% NaOCl + PDT with methylene blue/660 nm laser at 8 J for 80 seconds; methylene blue alone; PDT alone with methylene blue/660 nm laser at 18 J for 180 seconds; PDT alone with methylene blue/660 nm laser at 8 J laser for 80 seconds; positive control group; and negative control group. Microbial growth was evaluated by culture medium turbidity and microbial concentration was analyzed by UV spectrophotometry (adjusted to read at wavelength l = 600 nM). RESULTS: Root canals treated with laser alone at 18 J for 180 seconds had higher bacterial contamination compared with groups in which NaOCl was used, with or without laser irradiation at 18 J for 180 seconds (p < 0.05). CONCLUSION: Photodynamic therapy with a 660 nm diode laser effectively reduced E. faecalis contamination. These findings can guide development of further studies in search of better alternatives for endodontic treatment. CLINICAL RELEVANCE: Chemical and mechanical root canal preparation plays an essential role in reducing microbial burden. However, microorganisms present in areas not mechanically reachable by endodontic instruments. As an alternative to fix this problem, the laser can be applied.


Assuntos
Cavidade Pulpar/microbiologia , Dentina/microbiologia , Enterococcus faecalis/efeitos da radiação , Lasers Semicondutores , Fotoquimioterapia , Antibacterianos/farmacologia , Relação Dose-Resposta à Radiação , Farmacorresistência Bacteriana , Enterococcus faecalis/efeitos dos fármacos , Humanos , Hipoclorito de Sódio/farmacologia
6.
J Contemp Dent Pract ; 19(8): 933-936, 2018 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-30150492

RESUMO

AIM: This study aimed to assess the eruption of impacted teeth in cleft lip and/or palate (CLP) after alveolar bone graft. MATERIALS AND METHODS: Research was carried out through a cross-sectional study at the Craniofacial Rehabilitation Center of the University General Hospital of the University of Cuiaba, Mato Grosso, Brazil. Variables related to cleft, cleft side, gender, age, laterality of cleft, impacted teeth, and orthodontic traction were analyzed. RESULTS: Forty-two patients treated at the institution from 2004 to 2011 were recruited. There were 54.76% males and 45.24% females. The age group between 9 and 11 years was most affected in 59.53% of cases. The unilateral cleft was the most prevalent (85.71%). A total of 57 impacted teeth were observed. Maxillary canine was the most prevalent impacted teeth (97.61%) and more frequent in transforamen incisor cleft (TIC) (76.3%). The orthodontic traction was needed in both maxillary canines and lateral incisor impacted teeth, 64.3 and 35.7% respectively. The orthodontic traction was needed only in TIC (p = 0.0101). CONCLUSION: The canine teeth were the most prevalent, mainly related to the TIC and all impacted teeth erupted spontaneously in the preforamen incisor cleft (PIC) after placement of the bone graft. CLINICAL SIGNIFICANCE: There was spontaneous eruption of impacted teeth after secondary alveolar bone graft in CLP.


Assuntos
Enxerto de Osso Alveolar , Fenda Labial/epidemiologia , Fissura Palatina/epidemiologia , Erupção Dentária , Dente Impactado/epidemiologia , Adolescente , Brasil/epidemiologia , Criança , Estudos Transversais , Dente Canino , Feminino , Humanos , Masculino , Ortodontia Corretiva/estatística & dados numéricos , Prevalência
7.
J Contemp Dent Pract ; 19(3): 278-282, 2018 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-29603698

RESUMO

AIM: This study aims to evaluate the effect of erbium: Yttrium-aluminum-garnet (Er:YAG) laser irradiation on the enamel microshear bond strength (µSBS), followed by the utilization of etch-and-rinse and universal adhesive systems. MATERIALS AND METHODS: A total of 32 molars were sectioned in the mesiodistal direction producing 64 samples that were randomized into two groups (n = 32): single bond 2 (SB2) (etch-and-rinse system; 3M), SB universal (SBU) (universal etching system; The SB2 and SBU groups were then divided into two subgroups (n = 16): (i) enamel was irradiated with an Er:YAG laser (λ = 2.94 µm, 60 mJ, 10 Hz), and (ii) enamel served as a control. The samples were restored with TPH3 (Dentsply), stored in artificial saliva for 24 hours, and subjected to a micro-shear test. RESULTS: Kruskal-Wallis (p < 0.05) and Mann-Whitney U tests indicated no significant differences in uSBS between the groups, and the fractures were predominately at the resin-enamel interface. CONCLUSION: The previous irradiation of enamel with Er:YAG laser does not interfere with the performance of simplified two-step etch-and-rinse and universal adhesive systems. CLINICAL SIGNIFICANCE: The increasing use of Er:YAG laser is important to evaluate the influence of this irradiation on the adhesion of restorative materials. Thus, to obtain the longevity of the restorative procedures, it is necessary to know the result of the association of the present adhesive systems to the irradiated substrate.


Assuntos
Cimentos Dentários/uso terapêutico , Esmalte Dentário/cirurgia , Lasers de Estado Sólido/uso terapêutico , Alumínio , Colagem Dentária/métodos , Corrosão Dentária/métodos , Humanos , Melhoria de Qualidade , Ítrio
8.
J Contemp Dent Pract ; 19(1): 3-12, 2018 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-29358528

RESUMO

AIM: With the development of the light-emitting diode (LED) to photo-activate composite resin, greater intensities could be reached without greater elevation of temperature in the mass of the composite resin and in the dental structure arisen from the irradiance in comparison to halogen equipments. This new scenario created a necessity to investigate the influence of temperature over the composite polymerization. MATERIALS AND METHODS: Several curing temperatures (Tcure- 0, 25, 50, 75, and 100°C) were used to polymerize a composite resin (Filtek Z250, 3M ESPE) for 40 and 60 s, using the halogen equipment Gnatus Optilight Digital (halogen) and two LEDs that use a new technology to assembly the diodes: LEC 1000 and bright LEC (MM Optics) (LED 1 and LED 2 respectively). The influence of curing temperature, added by the other variables studied, was evaluated using a methodology developed and improved at IFSC/USP, in which the penetration of a fluorescent dye in the body of the photopolymerized composite resin was quantified using fluorescence spectroscopy. RESULTS: According to the final data submitted to an analysis of variance, the presence of two groups of results could be verified: Between 0 and 25°C, both had a great percentage of the dye penetration compared with other Tcure with a variation in penetration from 69.26 ± 8.19% to 90.99 ± 3.38%. In this analysis, the effects of time and temperature were highly notable (p < 0.05) and the lesser value of dye penetration took place at 60 s of photoactivation This penetration was, in average, smaller with the Tcure of 25°C. The results showed that there was an interaction between the equipment and time and between time and temperature; the other group is regarding the Tcure was from 50, 75, and 100°C, despite the p = 0.05, the effect of temperature was notable. The penetration of the dye ranged from 8.87 ± 3.55 to 39.47 ± 8.9%. The effects of equipment and time were highly notable. The penetration with the time of 60 s was in average smaller. Except with the equipment LED 1, the percentages of the dye penetration were greater with the Tcure of 100°C. The smallest average was the Tcure of 50°C and 60 s of photoactivation. CONCLUSION: Based on the available data regarding the influence of curing temperature on the polymerization process of composite resins, was possible to concluded that small increments of heat increased the degree of conversion. We can assume that the energy supply through the generation of heat by the photopolymerizing devices can function as a heating medium for the reagent system by reducing its viscosity and increasing the mobility and agitation of its components. CLINICAL SIGNIFICANCE: The dentist must be aware of the effects that exist between the activation devices on the light output and their heat transmission to the composite and the tooth itself. This heat transmission might create a polymer with better characteristics.


Assuntos
Resinas Compostas/química , Materiais Dentários/química , Corantes Fluorescentes/química , Cura Luminosa de Adesivos Dentários , Temperatura , Teste de Materiais , Polimerização , Espectrometria de Fluorescência , Propriedades de Superfície
9.
J Contemp Dent Pract ; 19(1): 37-41, 2018 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-29358532

RESUMO

AIM: The aim of this study is to evaluate the effect of dental prophylaxis techniques on surface roughness of composite resins. MATERIALS AND METHODS: A total of 36 nanohybrid resin composite test specimens were fabricated and divided into three groups (n = 12). They were kept in distilled water at 37°C for 24 hours and submitted to the finishing and polishing technique. For the prophylactic techniques, in group G1, a mixture of pumice stone and distilled water was used with the aid of a rubber cup; in group G2, Herjos-F prophy paste was used with a rubber cup; and in group G3, a bicarbonate jet spray was used. Afterward, all the samples were repolished using the Soflex pop-on disks. A roughness meter was used to measure surface roughness at three points in time: Before the prophylactic techniques (1st evaluation), afterward (2nd evaluation), and following repeat polishing (3rd evaluation). RESULTS: It was found that roughness values changed significantly between the 1st and 2nd evaluations (p < 0.05) and between the 2nd and 3rd evaluations (p < 0.05), showing that the change in roughness depended on the type of prophylactic treatment. Roughness was significantly higher after the bicarbonate jet (p < 0.05). CONCLUSION: Prophylaxis using the sodium bicarbonate jet significantly altered the roughness of nanoparticle-reinforced resin. CLINICAL SIGNIFICANCE: Dental prophylaxis is the most common practice employed to remove bacterial plaque and other coatings. However, one side effect of the cleaning may be a rougher surface subject to degradation and staining. The correct use of prophylactic devices and avoiding prolonged use on resin restorations reduce surface roughness.


Assuntos
Resinas Compostas/química , Profilaxia Dentária/métodos , Polimento Dentário/métodos , Silicatos , Bicarbonato de Sódio , Propriedades de Superfície
10.
J Contemp Dent Pract ; 19(11): 1322-1328, 2018 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-30602635

RESUMO

AIM: This study aimed to evaluate the influence of labial and dentogingival characteristics on facial and smile attractiveness. MATERIALS AND METHODS: Four different close-up photographs each of six women models with different labial and dentogin-gival characteristics were obtained. One of the models was considered standard. Photographs were arranged in an album were evaluated by 100 laypersons, and 30 dentists who ranked each close-up of the models from according to the degree of attractiveness from first to sixth place, with first being the model considered most attractive and justified the reasons for choosing. RESULTS: The standard model received the best scores for both lips (7.75) and face (5.18). Medium-sized lips were preferred (p < 0.05), and the smile positively or negatively interfered with esthetic perception depending on the dentogingival alteration present. Diastema was the alteration that had the greatest negative influence. CONCLUSION: Not all dentogingival alterations interfere with esthetic evaluation. The lips are not decisive in facial attractiveness. Attraction is assessed significantly differently by laypeople than by dentists. The smile directly influences the analysis of facial beauty. CLINICAL SIGNIFICANCE: Dentogingival alterations may be imperceptible, especially when evaluating the facial joint, so its correction will not always be necessary.


Assuntos
Beleza , Dentição Permanente , Estética Dentária/psicologia , Face/anatomia & histologia , Face/fisiologia , Lábio/anatomia & histologia , Lábio/fisiologia , Sorriso/fisiologia , Estudos Transversais , Diastema , Face/diagnóstico por imagem , Expressão Facial , Feminino , Humanos , Lábio/diagnóstico por imagem , Fotografação
11.
J Contemp Dent Pract ; 18(11): 1051-1055, 2017 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-29109320

RESUMO

INTRODUCTION: The aim of this study was to evaluate the effects of bleaching gel using 35% hydrogen peroxide (HP), associated with red carmine pigment (RC), in the 3:1 or 1:1 ratio, on fracture resistance and dentin microhardness of endodontically treated teeth. MATERIALS AND METHODS: A total of 40 lower incisors were endodontically treated and divided into four groups (n = 10), according to the bleaching protocol: G1 (HP3), 35% HP + RC (3:1); G2 (HP1), 35% HP + RC (1:1); G3 (positive), 38% HP; and G4 (negative), unbleached. Four dental bleaching sessions were performed. The dental crowns were restored after the last session and submitted to the fracture resistance test. Totally, 60 specimens from the endodontically treated lower incisor crowns were prepared to evaluate the effects on dentin microhardness. The analysis was measured (in Knoop) prior to and after the last dental bleaching session using similar bleaching protocols. RESULTS: G2 presented the lowest fracture resistance (p < 0.05). The other groups were similar to each other (p > 0.05). No difference was observed in the reduction of dentin microhardness among the groups (p > 0.05). CONCLUSION: A 1:1 ratio (bleaching gel:pigment) caused a significant fracture resistance reduction in relation to the other protocols. No effect on the dentin microhardness reduction was observed. CLINICAL SIGNIFICANCE: The pigment addition to the bleaching agent accelerates the bleaching chemical reaction. However, no studies have evaluated the ideal proportion to optimize tooth bleaching.


Assuntos
Corantes/administração & dosagem , Análise do Estresse Dentário , Dentina , Peróxido de Hidrogênio/administração & dosagem , Clareadores Dentários/administração & dosagem , Fraturas dos Dentes , Dente não Vital , Géis , Testes de Dureza , Humanos , Técnicas In Vitro
12.
J Contemp Dent Pract ; 17(12): 969-972, 2016 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-27965481

RESUMO

INTRODUCTION: This study evaluated the cervical fit of cemented metal-ceramic and In-Ceram implant-supported crowns, before and after the cementing procedure. MATERIALS AND METHODS: Twenty crowns cemented on implant abutments are divided into two groups (n = 10): Group 1 -cemented metal-ceramic crowns and group 2 - cemented In-Ceram crowns. The marginal adaptations before and after cementation were evaluated in a comparison microscope with an error of 1 µm. All crowns were cemented with zinc phosphate cement. RESULTS: The cervical misalignment of cemented crowns before cementation (52.65 ± 11.83 and 85.73 ± 14.06 µm) was lower than that after cementation (66.80 ± 15.86 and 89.36 ± 22.66 µm). CONCLUSION: The cementing procedure interferes with the marginal fit of cemented crowns on implant abutments, with the prosthesis having better adaptation before cementation. Cemented metal-ceramic crowns exhibited better cervical adaptation than In-Ceram crowns cemented before and after the cementing procedure. CLINICAL SIGNIFICANCE: The maintenance of gum health and the longevity of prosthetic restorations are closely related to the restoration's marginal integrity.


Assuntos
Óxido de Alumínio , Cimentação/métodos , Coroas , Cimentos Dentários , Porcelana Dentária , Ligas Metalo-Cerâmicas , Planejamento de Prótese Dentária , Falha de Restauração Dentária , Humanos
13.
J Contemp Dent Pract ; 17(12): 1033-1039, 2016 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-27965493

RESUMO

INTRODUCTION: This article presents a 6-month case report and an in vitro evaluation of the performance of the new self-etching glass-ceramic monobond etch and prime (MEP) when applied in a lithium disilicate (LD). The MEP contains in the same bottle, along with acid conditioner and silanes. This simplifies the bonding procedures by reducing not only the number of steps, but also the working time. A 42-year-old female patient sought for esthetic treatment, and the main complaint was the darkened appearance of the upper lateral incisor. The esthetic treatment includes dental bleaching and gingivectomy, all-ceramic zirco-nia crowns, and all-ceramic crown and laminate veneer LD. After 6 months of esthetic treatment, marginal staining, gap, or chip fracturing damaging margins after sharp explorer in the margins was not observed. Furthermore, the inferior etching pattern of MEP was compared with traditional hydrofluoric acid (HF) conditioning. The microshear bond strength to the intaglio surface of LD was statistically similar when HF was compared with MEP. This new self-etching glass-ceramic showed good in vitro and 6 months clinical results in this case report. Future long-term clinical studies with more clinical case need to be done to confirm the performance of the use of this new conditioner. CLINICAL SIGNIFICANCE: The use of a new self-etching glass-ceramic showed a good in vitro and 6 months clinical results. This new product can be an easy, simple, and alternative approach for esthetics bonding procedure.


Assuntos
Cerâmica , Colagem Dentária , Corrosão Dentária/métodos , Restauração Dentária Permanente/métodos , Condicionamento Ácido do Dente , Adulto , Porcelana Dentária , Análise do Estresse Dentário , Feminino , Humanos , Ácido Fluorídrico , Técnicas In Vitro , Teste de Materiais , Resistência ao Cisalhamento , Silanos , Propriedades de Superfície
14.
J Contemp Dent Pract ; 17(11): 902-906, 2016 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-27965498

RESUMO

INTRODUCTION: The study aimed to compare the shaping and preservation of the original curvature of simulated curved root canals using the following instruments: Reciproc (Rcp), WaveOne (Wo), and the ProTaper Next system (Ptn). MATERIALS AND METHODS: A total of 45 resin blocks with simulated curved root canals were divided into three groups (n = 15), prepared using the Rcp (R25), Wo (25/0.8), and Ptn (X2) instruments. Standardized photographs were taken before and after canal instrumentation. After the superimposition of the images, the amount of resin removed from the curvature's inner and outer walls was measured at six apical levels, at intervals of 1 mm. The canals' angles of curvature before and after instrumentation were subtracted. RESULTS: There were no significant differences between the instruments in terms of the total amount of resin removed of the inner or outer walls of the apical curvature (p > 0.05). The Rcp instruments provided the best resin removed ratios between the walls. The means of the change in angle were as follows: Wo = 2.15°, Ptn = 0.92°, and Rcp = 0.21°. WaveOne caused significantly higher deviations than Rcp. CONCLUSION: All of the instruments demonstrated a tendency to straighten the simulated root canal. Instruments that use rotary movement achieved an effect similar to that of the reciprocating instruments in relation to change in angle. CLINICAL SIGNIFICANCE: Deviations from the original shape of the root canal could have a negative impact on the quality of a filling and consequently on the success of the endodontic treatment.


Assuntos
Simulação por Computador , Ligas Dentárias/química , Cavidade Pulpar/anatomia & histologia , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Tratamento do Canal Radicular/instrumentação , Instrumentos Odontológicos , Desenho de Equipamento , Humanos , Teste de Materiais , Modelos Anatômicos , Níquel , Fotografação , Cimentos de Resina , Rotação , Titânio/química , Ápice Dentário/anatomia & histologia
15.
J Contemp Dent Pract ; 17(10): 807-814, 2016 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-27794150

RESUMO

INTRODUCTION: The bidirectional relationship between the periodontal diseases and systemic diseases was attributed to the focal infection concept. The aims of this study were to assess the periodontal and microbiological profile of intensive care unit (ICU) inpatients submitted to orotracheal intubation, and classify them regarding gender, age group, ethnic, hospitalization reason and period, nosocomial infection occurrence, and death. MATERIALS AND METHODS: Inpatients were assessed, distributed into toothed and toothless groups. The periodontal clinical condition was assessed 24 hours after the ICU admission through plaque index, gum index, probing depth, and clinical level of insertion. All microbiological samples were collected on the 6th day of admission. These samples were collected from different intraoral sites, depending on the group: In the toothed group, samples were collected from gingival sulcus and in the toothless group, from buccal mucosa and tongue. Identification for Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), and Tannerella forsythia (Tf) was accomplished and analyzed, using absolute quantification and specific primer pairs through an amplification system with probes. RESULTS: Forty subjects composed the sample: Gender characterized by 60% of male, 27.5% of all patients were older than 60, and 22.5% were hospitalized due to cerebrovascular accident. Regarding hospitalization period, 55% of patients were hospitalized for 6 days and 70% of them died during the period of hospitalization. Of inpatients, 40% presented periodontal disease and 100% presented dental biofilm on assessed sites. When assessing the microbiota, statistical significance was observed between Aa, Pg, and Tf, for both toothed and toothless group (p < 0.0001). CONCLUSION: Large quantities of Aa were found in samples of toothless inpatients, a fact that suggests that the oral environment, even without teeth, presents favorable conditions for bacterial biofilm formation with a related pathogenic potential. CLINICAL SIGNIFICANCE: The dental biofilm may comprise pulmonary pathogen colonies, promoting a perfect environment for their growth and development, facilitating the colonization of the lower airways, as well as colonization by bacteria originally from the oral cavity.


Assuntos
Depósitos Dentários/microbiologia , Pacientes Internados , Unidades de Terapia Intensiva , Adolescente , Adulto , Idoso , Aggregatibacter actinomycetemcomitans/isolamento & purificação , Feminino , Gengiva/microbiologia , Humanos , Arcada Edêntula/microbiologia , Masculino , Pessoa de Meia-Idade , Mucosa Bucal/microbiologia , Doenças Periodontais/diagnóstico , Porphyromonas gingivalis/isolamento & purificação , Estudos Prospectivos , Tannerella forsythia/isolamento & purificação , Língua/microbiologia , Adulto Jovem
16.
J Contemp Dent Pract ; 17(10): 820-825, 2016 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-27794152

RESUMO

INTRODUCTION: The adhesive systems and the techniques currently used are designed to provide a more effective adhesion with reduction of the protocol application. The objective of this study was to evaluate the bond strength of universal adhesive systems on enamel in different etching modes (self-etch and total etch). MATERIALS AND METHODS: The mesial and distal halves of 52 bovine incisors, healthy, freshly extracted, were used and divided into seven experimental groups (n = 13). The enamel was treated in accordance with the following experimental conditions: FUE-Universal System - Futurabond U (VOCO) with etching; FUWE - Futurabond U (VOCO) without etching; SB-Total Etch System - Single Bond 2 (3M); SBUE-Universal System - Single Bond Universal (3M ESPE) with etching; SBUWE - Single Bond Universal (3M ESPE) without etching; CLE-Self-etch System - Clearfil SE Bond (Kuraray) was applied with etching; CLWE - Clearfil SE Bond (Kuraray) without etching. The specimens were made using the composite spectrum TPH (Dentsply) and stored in distilled water (37 ± 1°C) for 1 month. The microshear test was performed using the universal testing machine EMIC DL 2000 with the crosshead speed of 0.5 mm/minute. The bond strength values were analyzed using statistical tests (Kruskal-Wallis test and Mann-Whitney test) with Bonferroni correction. RESULTS: There was no statistically significant difference between groups (p < 0.05), where FUE (36.83 ± 4.9 MPa) showed the highest bond strength values and SBUWE (18.40 ± 2.2 MPa) showed the lowest bond strength values. The analysis of adhesive interface revealed that most failures occurred between the interface composite resin and adhesive. CONCLUSION: The universal adhesive system used in dental enamel varies according to the trademark, and the previous enamel etching for universal systems and the self-etch both induced greater bond strength values. CLINICAL SIGNIFICANCE: Selective enamel etching prior to the application of a universal adhesive system is a relevant strategy for better performance bonding.


Assuntos
Condicionamento Ácido do Dente/métodos , Adesivos/química , Colagem Dentária , Cimentos de Resina , Resistência ao Cisalhamento , Animais , Bovinos , Análise do Estresse Dentário , Teste de Materiais
17.
J Contemp Dent Pract ; 17(10): 830-836, 2016 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-27794154

RESUMO

INTRODUCTION: This cross-sectional study evaluated the prevalence and quality of root canal treatment in 1,977 digital radiological files. MATERIALS AND METHODS: Data were statistically analyzed using descriptive analysis, and the chi-square test was performed with a 5% significance level. RESULTS: The mean age of the study population was 34.9 years. The endodontic treatment frequency was 6.14%, significantly higher in premolars. Adequate endodontic treatment was observed in 39.7% of analyzed cases. Molars were significantly more frequent with regard to inadequate filling quality. In 47.6% of cases, the filling's apical limit was classified as adequate, and there was a higher incidence of molars that were inadequate. Restorations were classified as adequate in 79.0% of cases, and molars were responsible for the highest frequency of inadequate restorations. The frequency of teeth with endodontic treatment that showed no periapical changes was 47.7%. There was no significant difference in the presence of periapical change according to gender. An increased presence of periapical change was observed with increasing age. The periapical lesions were observed in 45% of cases and related to inadequate filling quality. The apical limit was considered inadequate and related to periapical changes in 42% of cases. Periapical changes were present in 52% of cases, regardless of the quality of the filling and apical limit. Such changes were present in 42% of cases with adequate coronal restoration. CONCLUSION: It can be concluded that apical periodontitis (AP) is associated with the quality of endodontic treatment. The coronal restoration affects significantly the success rate of endodontic treatment. CLINICAL SIGNIFICANCE: The quality of the root filling and coronal restoration is closely related to periapical health.


Assuntos
Coroas , Restauração Dentária Permanente , Obturação do Canal Radicular , Adolescente , Adulto , Idoso , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Doenças Periapicais/terapia , Índice Periodontal , Radiografia Dentária Digital , Radiografia Panorâmica , Adulto Jovem
18.
J Contemp Dent Pract ; 17(8): 615-7, 2016 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-27659075

RESUMO

The substances used in the root canal treatment, especially sodium hypochlorite solution and oxidant agents, can negatively interfere on the bond strength of the adhesive systems to dentin and on the dental crowns fracture resistance.(1,2).


Assuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária , Restauração Dentária Permanente , Dentina , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular
19.
J Contemp Dent Pract ; 17(2): 160-4, 2016 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-27207006

RESUMO

OBJECTIVE: To evaluate the dimensional changes, reproduction of details, and surface roughness of a type IV cast and a resin used to fabricate dental models. MATERIALS AND METHODS: Two commercial brands of materials were evaluated: a type IV synthetic cast (Fuji Rock) and a polyol resin (Novox). Twenty samples were obtained from polyvinyl siloxane molds that reproduced the surface of a metal master model standardized according to the American National Standards Institute/American Dental Association specification no. 19. The materials were used according to the manufacturer's instructions and divided into two groups (n = 10). Each mold was photographed immediately after molding and 1 hour after molding. The obtained models were also photographed and measurements were obtained by using Image J software. The paired t-test was used to compare the molding materials and one-way analysis of variance (ANOVA) was used to compare the dimensional changes between the groups at a significance level of 5%. RESULTS: Statistically significant differences were observed between the models fabricated with the polyol resin and type IV synthetic cast with regard to reproduction of surface details, surface roughness, and dimensional stability (p < 0.05), with the resin providing superior surface detail reproduction and greater dimensional accuracy. CONCLUSION: The polyol resin exhibited superior behavior regarding detail reproduction, surface roughness, and dimensional change compared with the type IV synthetic cast.


Assuntos
Polímeros , Resinas Sintéticas , Análise de Variância , Materiais Dentários , Teste de Materiais , Polivinil , Siloxanas , Propriedades de Superfície
20.
ROBRAC ; 22(60)jan.-mar. 2013. tab, ilus
Artigo em Português | LILACS-Express | LILACS | ID: lil-681395

RESUMO

Objetivo: Avaliou-se em estudos longitudinais a influência da infecção endodôntica no desenvolvimento das alterações cardiovasculares. Metodologia: Empregou-se fontes de catalogação bibliográfica identificadas eletronicamente por MEDLINE, a partir de 1966 até 02 de dezembro de 2012 e Cochrane Library. Como estratégia de busca utilizou-se os termos - cardiovascular disease, coronary heart disease, periapical lesion, periapical disease, endodontic infection e root canal infection - diferentes combinações. Os estudos foram selecionados por dois revisores independentes, que também determinaram os critérios de inclusão e exclusão. Resultados: A busca apresentou 191 artigos, sendo que destes, 33 artigos eram de revisão de literatura, 58 artigos relacionavam-se com estudos in vivo (humanos ou animais), 38 estudos eram relatos de casos clínicos e 2 incluíram estudos in vitro. Dos 58 estudos in vivo, 9 estudos satisfizeram os critérios de inclusão, o que possibilitou a análise dos dados. Conclusão: Diante dos resultados obtidos, observou-se ausência de homogeneidade dos protocolos clínicos empregados nos estudos incluídos, o que inviabilizou uma meta-análise. A partir dos estudos incluídos parece oportuno maior número de pesquisas para o estabelecimento com o rigor de evidência das possíveis relações entre estas duas doenças.


Aim: Longitudinal studies about the influence of endodontic infection as a risk factor for cardiovascular disease were studied. Methodology: Bibliographic tabulation sources identified electronically by MEDLINE, since 1966 until December 2nd of 2012 and Cochrane Library, on the same period, were used. As searching strategy the following terms were used in different combinations: cardiovascular disease, coronary heart disease, periapical lesion, periapical disease, endodontic infection e root canal infection. The studies were selected by two independent reviewers, which also determined the inclusion and exclusion criteria. Results: The search presented 191 related articles, and from these, 33 articles were literature reviews, 58 articles wer related to in vivo studies (humans or animals), 38 studies were cases reports, and 2 included in vitro and/or ex vivo studies.From the 58 in vivo studies, 9 studies satisfied the inclusion criteria, what enabled the data analysis. Conclusion: Based on these results, it was observed lack of homogeneity of the clinical protocols used in the included studies, which prevented a meta-analysis. From the included studies seems appropriate to further research to establish with the rigor of evidence of possible relationships between these two diseases.

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