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1.
J Prosthet Dent ; 2020 Jul 04.
Artigo em Inglês | MEDLINE | ID: mdl-32636072

RESUMO

STATEMENT OF PROBLEM: Information related to the optical and surface properties, including health compatibility, surface roughness, and esthetics, of 3D-printed dental materials is scarce. PURPOSE: The purpose of this in vitro study was to compare the physical and surface properties of a 3D-printed resin with those of materials used for interim restorations. MATERIAL AND METHODS: A 3D-printed resin (PR) (NextDent C&B MFH; 3D Systems), an autopolymerizing interim material (BA) (Protemp 4; 3M ESPE), and a composite resin (Z350) (Filtek Z350XT; 3M ESPE) were tested for degree of color change (ΔE) (n=7) at different timepoints-24 hours after polishing/baseline (P0), 8 days after polishing (P1), and after artificial aging in water at 60 °C for 24 hours (P2)-by using a CIELab-based colorimeter; flexural strength (σ) (n=10) with a 3-point bend test; Knoop hardness (H) (n=8); and surface roughness (Ra) (n=7) with a profilometer. All specimens were polished 24 hours after polymerization, except for the additional group for surface roughness (BA) without polishing (BANP). A statistical analysis was performed by using 2-way repeated-measures ANOVA followed by the Fischer test for ΔE and 1-way ANOVA followed by the Fisher test for microhardness and surface roughness (α=.05). RESULTS: The Z350 showed the highest values for σ and H, followed by PR. BA showed the lowest results for both tests (P<.05). Considering roughness, the Z350 showed similar values to those of BA but lower than PR; PR showed similar roughness when compared with BA. PR showed the highest color variation among the groups at all timepoints, followed by BA. The Z350 was the most color stable material at all timepoints. CONCLUSIONS: The 3D-printed composite resin had adequate mechanical and surface properties for an interim restorative material. It has the potential to be a low-cost workflow in dentistry, although its color stability could be a concern for long-term use.

2.
J Prosthodont Res ; 64(4): 408-416, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32059955

RESUMO

PURPOSE: To evaluate the shear bond strength (SBS) between Y-TZP and a resin luting agent, after 1 of 2 enhancing strategies with TiO2--nts was applied, either to the resin luting agent or the Y-TZP mass, in different concentrations. METHODS: In the Strategy TiO2-nts on ceramic, the resin luting agent Panavia F2.0™ (Kuraray) and an experimental Y-TZP with added concentrations of TiO2--nts (0%, 1%, 2%, and 5% vol/vol) and a commercial Y-TZP, comprised 5 different groups (n = 10). In the Strategy TiO2-nts on cement, the resin luting agent RelyX U200™ (3 M ESPE) was added with different concentrations of TiO2--nts (0%, 0.3%, 0.6%, 0.9% wt/wt) luted to a commercial Y-TZP, comprising 4 different groups (n = 10). The Y-TZP discs were included in acrylic bases, and a cylinder (3 × 3 mm) of the correspondent luting agent for each respective group was applied over them. After 24 h, specimens were subjected to SBS assessments in a universal testing machine. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were also performed on Y-TZP surfaces. Data were analyzed via analysis of variance and Tukey tests (α = 0.05). RESULTS: TiO2-nts on ceramic influenced the bond strength significantly, but not linearly; TiO2-nts on cement did not influence bond strength when analyzed separately, nor in comparison with the first. CONCLUSION: Y-TZP enhancements with TiO2-nts led to a higher SBS with Panavia F2.0, a 5% TiO2--nt concentration presented the highest bond strength. Modified Rely X U200 did not improve SBS.


Assuntos
Colagem Dentária , Nanotubos , Cimentos Dentários , Análise do Estresse Dentário , Teste de Materiais , Microscopia Eletrônica de Varredura , Cimentos de Resina , Resistência ao Cisalhamento , Propriedades de Superfície , Titânio , Ítrio , Zircônio
3.
Braz. dent. sci ; 23(2): 1-9, 2020. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1096543

RESUMO

Objective: multidisciplinary treatment has become increasingly common in dental offices and this treatment strategy is based on the achievement of a healthy, harmonious, and pleasant smile. In addition, the development of new ceramic systems and the possibility of making indirect restorations with a low thickness, such as laminates veneers, allowed combining highly satisfactory aesthetic properties, preserving the dental structure through minimally Invasive technique. Case report: this paper describes a multidisciplinary approach involving periodontics and restorative dentistry for the successful, functional, and aesthetic treatment in an adult patient. The digital smile design was performed as a guide to plan the clinical case considering factors such as tooth inclination and position, golden proportion, tooth size and shape. Discussion: based on these concepts, the present work reports, through a clinical case, the restoration of aesthetics and function with ceramic laminates veneers in lithium disilicate, in the case of anatomical correction and diastema closure. Conclusion: overall, the multidisciplinary treatment plan demonstrated to have greater advantages both for the aesthetics and function of the patient, as well as for the work team. During the 24-month follow-up, this case presented great functional and aesthetics results. (AU)


Introdução: o tratamento multidisciplinar tornou-se cada vez mais comum nos consultórios odontológicos, sendo uma estratégia baseada no tratamento da obtenção de um sorriso saudável, harmonioso e agradável. Além disso, o desenvolvimento de novos sistemas cerâmicos e a possibilidade de fazer restaurações indiretas com baixa espessura, como facetas laminadas, permitiram combinar propriedades estéticas altamente satisfatórias, preservando a estrutura dentária com o mínimo desgaste. Caso clínico: este artigo descreve uma abordagem multidisciplinar envolvendo Periodontia e Odontologia restauradora para um tratamento funcional e estético em um paciente adulto. O desenho digital do sorriso foi realizado como um guia para planejar o caso clínico, considerando fatores como inclinação e posição do dente, proporção áurea, tamanho e formato do dente. Discussão: com base nesses conceitos, o presente trabalho relata, através de um caso clínico, a restauração estética e funcional com laminados cerâmicos em dissilicato de lítio para correção anatômica e fechamento de diastemas. Conclusão: em geral, o plano de tratamento multidisciplinar demonstrou ter maiores vantagens tanto para a estética e função do paciente, quanto para a equipe de trabalho. Durante os 24 meses de acompanhamento, esse caso apresentou ótimos resultados funcionais e estéticos. (AU)


Assuntos
Facetas Dentárias , Estética Dentária
4.
Braz Dent J ; 30(6): 592-598, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31800754

RESUMO

This study aimed to evaluate the polymerization properties of bulk-fill materials (low and high-viscosity) by using high-intensity continuous light and intermittent photo-activation in terms of polymerization shrinkage stress and degree of conversion (DC). The following Bulk-fill and Conventional nanofilled resin composites were evaluated: Filtek Z350XT Flow (3M/ESPE), SureFil SDR Flow (Dentsply), Filtek Bulk Fill Flow (3M/ESPE), Filtek Z350XT (3M/ESPE) and Filtek Bulk Fill Posterior (3M/ESPE). A LED device (DB 685, Dabi Atlante) was used for both protocols: continuous uniform and intermittent photo-activation (light-on and light-off cycles) with identical radiant exposure (14 J/cm2). The polymerization shrinkage stress (n=6) was evaluated by inserting a single increment of 12 mm3 between two stainless steel plates (6×2 mm) adapted to a Universal Testing Machine (UTM), at different times. Measurements were recorded after photo-activation. The degree of conversion was evaluated by Fourier transformed infrared spectroscope (FTIR) with an attenuated total reflectance (ATR) accessory (n=5). Data were analyzed by three-way ANOVA and Tukey's HSD (α=0.05) tests. Bulk Fill Posterior presented higher shrinkage stress values when photo-activated with the intermittent technique (p<0.05). The intermittent photo-activation increased the degree of conversion for the low-viscosity bulk-fills (p<0.05). Therefore, the use of modulated photo-activation (intermittent) must be indicated with caution since its use can influence the shrinkage stress and degree of conversion of composites, which varies according to the resin formulations.


Assuntos
Resinas Compostas , Teste de Materiais , Polimerização , Viscosidade
5.
Curr Pharm Des ; 25(37): 3997-4012, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31701845

RESUMO

BACKGROUND: The high surface-to-volume ratio of polymeric nanofibers makes them an effective vehicle for the release of bioactive molecules and compounds such as growth factors, drugs, herbal extracts and gene sequences. Synthetic polymers are commonly used as sensors, reinforcements and energy storage, whereas natural polymers are more prone to mimicking an extracellular matrix. Natural polymers are a renewable resource and classified as an environmentally friendly material, which might be used in different techniques to produce nanofibers for biomedical applications such as tissue engineering, implantable medical devices, antimicrobial barriers and wound dressings, among others. This review sheds some light on the advantages of natural over synthetic polymeric materials for nanofiber production. Also, the most important techniques employed to produce natural nanofibers are presented. Moreover, some pieces of evidence regarding toxicology and cell-interactions using natural nanofibers are discussed. Clearly, the potential extrapolation of such laboratory results into human health application should be addressed cautiously.

6.
Braz. dent. j ; 30(6): 592-598, Nov.-Dec. 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1055449

RESUMO

Abstract This study aimed to evaluate the polymerization properties of bulk-fill materials (low and high-viscosity) by using high-intensity continuous light and intermittent photo-activation in terms of polymerization shrinkage stress and degree of conversion (DC). The following Bulk-fill and Conventional nanofilled resin composites were evaluated: Filtek Z350XT Flow (3M/ESPE), SureFil SDR Flow (Dentsply), Filtek Bulk Fill Flow (3M/ESPE), Filtek Z350XT (3M/ESPE) and Filtek Bulk Fill Posterior (3M/ESPE). A LED device (DB 685, Dabi Atlante) was used for both protocols: continuous uniform and intermittent photo-activation (light-on and light-off cycles) with identical radiant exposure (14 J/cm2). The polymerization shrinkage stress (n=6) was evaluated by inserting a single increment of 12 mm3 between two stainless steel plates (6×2 mm) adapted to a Universal Testing Machine (UTM), at different times. Measurements were recorded after photo-activation. The degree of conversion was evaluated by Fourier transformed infrared spectroscope (FTIR) with an attenuated total reflectance (ATR) accessory (n=5). Data were analyzed by three-way ANOVA and Tukey's HSD (α=0.05) tests. Bulk Fill Posterior presented higher shrinkage stress values when photo-activated with the intermittent technique (p<0.05). The intermittent photo-activation increased the degree of conversion for the low-viscosity bulk-fills (p<0.05). Therefore, the use of modulated photo-activation (intermittent) must be indicated with caution since its use can influence the shrinkage stress and degree of conversion of composites, which varies according to the resin formulations.


Resumo O presente estudo teve como objetivo avaliar as propriedades de polimerização de materiais bulk-fill (baixa e alta viscosidade) utilizando luz contínua de alta intensidade e fotoativação intermitente em relação ao estresse de contração de polimerização e grau de conversão (DC). As seguintes resinas compostas Bulk-fill e nanohíbridas convencionais foram avaliadas: Filtek Z350XT Flow (3M/ESPE), SureFil SDR Flow (Dentsply), Filtek Bulk Fill Flow (3M/ESPE), Filtek Z350XT (3M/ESPE) e Filtek Bulk Fill Posterior (3M/ESPE). Um dispositivo de LED (DB 685, Dabi Atlante) foi utilizado nos dois protocolos: fotoativação contínua e intermitente contínua (ciclos de liga e desliga) com exposição idêntica (14 J/cm2). A tensão de contração de polimerização (n=6) foi avaliada através da inserção de um incremento único de 12 mm3 entre duas placas de aço inoxidável (6×2 mm) adaptadas a uma Máquina de Ensaio Universal (UTM), em tempos diferentes. As medições foram registradas após a fotoativação. O grau de conversão foi avaliado por FTIR-ATR (n=5). Os dados foram analisados ​​pelos testes ANOVA a três fatores e teste de Tukey (α=0,05). A resina Bulk Fill Posterior apresentou maiores valores de tensão de contração quando fotoativadas com a técnica intermitente (p<0,05). A fotoativação intermitente aumentou o grau de conversão nas resinas bulk-fill de baixa viscosidade (p<0,05). Portanto, o uso de fotoativação modulada (intermitente) deve ser indicado com cautela, uma vez que seu uso pode influenciar a tensão de contração e o grau de conversão dos compósitos, o que varia de acordo com as formulações da resina.

7.
Gen Dent ; 67(5): 24-28, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31454318

RESUMO

Dental caries is a significant oral health issue and public health concern. Currently conceptualized as a dynamic and multifactorial process, caries is a continuum of disease stages, during which tooth damage may be reversed or controlled, depending on lesion progression. The International Caries Detection and Assessment System, when used in conjunction with the Lesion Activity Assessment (ICDAS-LAA), reflects the dynamic caries process and allows the classification of cavitated lesions according to their severity and progression, which is essential to selecting the appropriate treatment. This case report describes the diagnosis and treatment of a patient who had caries in the past and in whom old lesions remained untreated. The ICDAS-LAA was used to assess caries accurately and guide treatment decisions. The patient maintained a dietary journal for 2 weeks to help establish her risk of developing caries. Treatment involved a minimally invasive dentistry approach, which consisted of remineralization via fluoride applications, placement of a composite resin restoration, microabrasion, and periodic maintenance. During the 28-month follow-up period, rigorous control of caries risk factors was achieved, and the results were satisfactory, demonstrating the effectiveness of the ICDAS-LAA in diagnosing and managing carious lesions.


Assuntos
Assistência Odontológica/tendências , Cárie Dentária , Cárie Dentária/diagnóstico , Cárie Dentária/terapia , Feminino , Seguimentos , Humanos , Fatores de Risco , Dente
8.
J Appl Oral Sci ; 27: e20180631, 2019 Aug 12.
Artigo em Inglês | MEDLINE | ID: mdl-31411263

RESUMO

OBJECTIVE: Extensive restorations in posterior teeth always bring doubts to the clinicians regarding the best protocol, mainly when structures of reinforcement were lost. OBJECTIVE: This study aimed to evaluate the effect of beveling on the fracture resistance and pattern of class II (MOD) restored teeth. METHODOLOGY: Ninety human premolars were randomly assigned into 9 groups: CTR (control/sound); NC (cavity preparation, non-restored); RU (restored, unbeveled); RTB (restored, entire angle beveling); RPB (restored, partial/occlusal beveling); EC (endodontic access/EA, non-restored); EU (EA, unbeveled); ETB (EA, entire angle beveling); EPB (EA, partial/occlusal beveling). Teeth were restored with Esthet X resin composite and stored in distilled water for 24 h before the inclusion in PVC cylinders. The axial loading tests were performed with 500 kgF at 0.5 mm/min crosshead speed until fracture of the specimens. Fracture resistance and pattern were accessed and data were analyzed using one-way ANOVA and Tukey's HSD test (α=0.05). RESULTS: Mean (±SD) failure loads ranged from 136.56 (11.62) to 174.04 (43.5) kgF in the groups tested without endodontic access. For endodontically accessed teeth, fracture resistance ranged from 95.54 (13.05) to 126.51 (19.88) kgF. Beveling of the cavosurface angle promoted the highest fracture resistance values (p<0.05) and prevented catastrophic fractures. CONCLUSIONS: Cavosurface angle beveling is capable of improving fracture resistance and pattern for both endodonticaly accessed and non-accessed teeth.


Assuntos
Dente Pré-Molar , Preparo da Cavidade Dentária/métodos , Restauração Dentária Permanente/métodos , Análise de Variância , Resinas Compostas/uso terapêutico , Humanos , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Fatores de Risco , Fraturas dos Dentes , Dente não Vital , Resultado do Tratamento
9.
Dent Mater J ; 38(3): 403-410, 2019 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-30918231

RESUMO

The present in vitro study assessed the polymerization shrinkage/PS, Knoop microhardness/KHN and depth of cure/DC of 9 different resin composites : Filtek Bulk Fill Flowable (FBF), Surefill SDR flow (SDR), Xtra Base (XB), Filtek Z350XT Flowable (Z3F), Filtek Bulk Fill Posterior (FBP), Xtra Fill (SF), Tetric Evo Ceram Bulk Fill (TBF), Admira Fusion Xtra (ADM), and Filtek Z350XT (Z3XT). PS was assessed with a µ-CT machine, scanning 64 mm3 samples (n=8) before and after 20 s curing. KHN and DC were performed with a microhardness tester (n=8 for each group) right after 20 s light curing, with 3 readings per depth at every 0.5 mm. Low viscosity resin composites showed lower KHN values when compared with high viscosity resins. Z3XT showed the highest microhardness among the tested resin composites. Z3XT and Z3F showed lower DC when compared with bulk fill resin composites. All bulk fill resin composites presented depth of cure higher than 4.5 mm and similar or lower PS than conventional resin composites.


Assuntos
Resinas Compostas , Teste de Materiais , Polimerização , Propriedades de Superfície , Viscosidade
10.
Braz Oral Res ; 33: e015, 2019 Feb 11.
Artigo em Inglês | MEDLINE | ID: mdl-30758411

RESUMO

We assessed the effect of a new coating material based on resin-modified glass-ionomer with calcium (Ca) in inhibiting the demineralization of underlying and adjacent areas surrounding caries-like lesions in enamel. The measures used were surface hardness (SH) and cross-sectional hardness (CSH). Thirty-six bovine enamel specimens (3 × 6 × 2 mm) were randomly allocated into three groups (n = 12): No treatment (NT); resin-modified glass-ionomer with Ca (Clinpro XT Varnish, 3M ESPE) (CL), and fluoride varnish (Duraphat, Colgate) (DU). The specimens were subjected to alternated immersions in demineralizing (6 h) and remineralizing solutions (18 h) for 7 days. SH measurements were conducted at standard distances of 150, 300, and 450 µm from the treatment area. CSH evaluated the mean hardness profile over the depth of the enamel surface and at standard distances from the materials. The energy-dispersive X-ray spectroscopy analysis was conducted to evaluate the demineralization bands created on the sublayer by % of calcium (Ca), phosphorus (P), and fluoride (F). Ca/P weight ratio was also calculated. Based on SH and CSH measurements, there was no difference between groups at the distances 150 µm (p = 0.882), 300 µm (p = 0.995), and 450 µm (p = 0.998). Up to 50 µm depth (at 150 µm from the treatment area), CL showed better performance than DU ( p< 0.05). NT presented higher loss of Ca and P than CL and DU (p < 0.05). There was no significant difference in the % of F ion among the three groups. The new coating material was similar to F varnish in attenuating enamel demineralization.


Assuntos
Cálcio/química , Esmalte Dentário/efeitos dos fármacos , Cimentos de Ionômeros de Vidro/química , Cimentos de Resina/química , Desmineralização do Dente/prevenção & controle , Animais , Cariostáticos/química , Bovinos , Fluoretos Tópicos/química , Testes de Dureza , Concentração de Íons de Hidrogênio , Teste de Materiais , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Fluoreto de Sódio/química , Espectrometria por Raios X , Propriedades de Superfície/efeitos dos fármacos , Fatores de Tempo
11.
J Appl Oral Sci ; 27: e20180132, 2019 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-30624465

RESUMO

Bulk-fill composites were introduced in dentistry to accelerate clinical procedures while providing adequate outcomes. Concerns regarding the use of bigger composite increments rely on the polymerization shrinkage and shrinkage stress, which may generate gaps on the adhesive interface and result in a reduced success rate. OBJECTIVE: To evaluate the polymerization shrinkage stress of different bulk-fill resin composites and their elastic modulus. MATERIALS AND METHODS: Fourteen specimens were made for each of the nine different resin composites (seven with 12 mm3 and seven with 24 mm3): Surefill SDR flow (SDR), X-tra Base (XB), Filtek Bulk Fill Flowable (FBF), Filtek Z350XT Flow (Z3F); Tetric Evo Ceram Bulk Fill (TBF), X-tra Fil (XF), Filtek Bulk Fill (FBP), Admira Xtra Fusion (ADM) and Filtek Z350 XT (Z3XT). Linear shrinkage stress was evaluated for 300 s with the aid of a linear shrinkage device adapted to a Universal Testing Machine. For each composite group, seven additional specimens (2x2x25 mm) were made and Young's modulus was evaluated with a 3-point bending device adapted in a Universal Testing Machine with 0.5 mm/min crosshead speed and 50 KgF loading cell. RESULTS: For 12 mm3 specimens, three-way ANOVA showed that only SDR and TBF generated lower stress after 20 s. Considering 300 s, TBF, SDR, and XF generated the lowest stress, followed by ADM, FBP, XB, and FBF, which were similar to Z3XT. Z3F generated the highest stress values for all time points. Considering 24 mm3 specimens after 20 s, all bulk fill composites generated lower stress than Z3XT, except XB. After 300 s, SDR, FBP, and ADM generated the lowest stress, followed by TBF and XF. For elastic modulus, one-way ANOVA showed that FBF, SDR, Z3F, and ADM presented the lowest values, followed by XB and TBF. FBP, Z3XT, and XF presented the highest elastic modulus among the evaluated composites. CONCLUSIONS: Bulk-fill resin composites presented equal to lower shrinkage stress generation when compared to conventional composites, especially when bigger increments were evaluated. Bulk-fill composites showed a wide range of elastic modulus values, but usually similar to "regular" composites.


Assuntos
Resinas Compostas/química , Módulo de Elasticidade , Polimerização , Estresse Mecânico , Análise de Variância , Análise do Estresse Dentário , Teste de Materiais , Metacrilatos/química , Valores de Referência , Reprodutibilidade dos Testes , Siloxanas/química , Estatísticas não Paramétricas , Propriedades de Superfície
12.
Braz. oral res. (Online) ; 33: e015, 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-989477

RESUMO

Abstract We assessed the effect of a new coating material based on resin-modified glass-ionomer with calcium (Ca) in inhibiting the demineralization of underlying and adjacent areas surrounding caries-like lesions in enamel. The measures used were surface hardness (SH) and cross-sectional hardness (CSH). Thirty-six bovine enamel specimens (3 × 6 × 2 mm) were randomly allocated into three groups (n = 12): No treatment (NT); resin-modified glass-ionomer with Ca (Clinpro XT Varnish, 3M ESPE) (CL), and fluoride varnish (Duraphat, Colgate) (DU). The specimens were subjected to alternated immersions in demineralizing (6 h) and remineralizing solutions (18 h) for 7 days. SH measurements were conducted at standard distances of 150, 300, and 450 µm from the treatment area. CSH evaluated the mean hardness profile over the depth of the enamel surface and at standard distances from the materials. The energy-dispersive X-ray spectroscopy analysis was conducted to evaluate the demineralization bands created on the sublayer by % of calcium (Ca), phosphorus (P), and fluoride (F). Ca/P weight ratio was also calculated. Based on SH and CSH measurements, there was no difference between groups at the distances 150 µm (p = 0.882), 300 µm (p = 0.995), and 450 µm (p = 0.998). Up to 50 µm depth (at 150 µm from the treatment area), CL showed better performance than DU ( p< 0.05). NT presented higher loss of Ca and P than CL and DU (p < 0.05). There was no significant difference in the % of F ion among the three groups. The new coating material was similar to F varnish in attenuating enamel demineralization.

13.
J. appl. oral sci ; 27: e20180132, 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-975898

RESUMO

Abstract Bulk-fill composites were introduced in dentistry to accelerate clinical procedures while providing adequate outcomes. Concerns regarding the use of bigger composite increments rely on the polymerization shrinkage and shrinkage stress, which may generate gaps on the adhesive interface and result in a reduced success rate. Objective: To evaluate the polymerization shrinkage stress of different bulk-fill resin composites and their elastic modulus. Materials and Methods: Fourteen specimens were made for each of the nine different resin composites (seven with 12 mm3 and seven with 24 mm3): Surefill SDR flow (SDR), X-tra Base (XB), Filtek Bulk Fill Flowable (FBF), Filtek Z350XT Flow (Z3F); Tetric Evo Ceram Bulk Fill (TBF), X-tra Fil (XF), Filtek Bulk Fill (FBP), Admira Xtra Fusion (ADM) and Filtek Z350 XT (Z3XT). Linear shrinkage stress was evaluated for 300 s with the aid of a linear shrinkage device adapted to a Universal Testing Machine. For each composite group, seven additional specimens (2x2x25 mm) were made and Young's modulus was evaluated with a 3-point bending device adapted in a Universal Testing Machine with 0.5 mm/min crosshead speed and 50 KgF loading cell. Results: For 12 mm3 specimens, three-way ANOVA showed that only SDR and TBF generated lower stress after 20 s. Considering 300 s, TBF, SDR, and XF generated the lowest stress, followed by ADM, FBP, XB, and FBF, which were similar to Z3XT. Z3F generated the highest stress values for all time points. Considering 24 mm3 specimens after 20 s, all bulk fill composites generated lower stress than Z3XT, except XB. After 300 s, SDR, FBP, and ADM generated the lowest stress, followed by TBF and XF. For elastic modulus, one-way ANOVA showed that FBF, SDR, Z3F, and ADM presented the lowest values, followed by XB and TBF. FBP, Z3XT, and XF presented the highest elastic modulus among the evaluated composites. Conclusions: Bulk-fill resin composites presented equal to lower shrinkage stress generation when compared to conventional composites, especially when bigger increments were evaluated. Bulk-fill composites showed a wide range of elastic modulus values, but usually similar to "regular" composites.

14.
Braz. j. oral sci ; 18: e191651, jan.-dez. 2019. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1095176

RESUMO

Aim: Using dietary supplements may affect the properties of composite resins due to their acidic pH. The present in vitro study aimed to assess the surface roughness and color stability of two composite resins - nanohybrid (Empress Direct) and nanoparticulate (Filtek Z350) - after prolonged exposure to dietary supplements. Methods: We produced 30 specimens from each composite (8x2-mm discs) and divided them into six groups (n=10). After the initial measurement of the surface properties (roughness and color), we exposed the specimens to a degradation process in Maltodextrin and Whey Protein for 22.5 and 7.5 days, respectively, using deionized water as the control solution. At the end of 22.5 days, we reassessed the specimens. After verifying data normality with the Kolmogorov-Smirnov test, we performed ANOVA followed by Tukey's test at 5%. Results: We found significant differences for materials immersed in the Whey Protein solution (p<0.05). The roughness of Empress Direct was higher (0.45+0.07) than Filtek Z350 (0.22+0.05). The composites tested also showed color change (ΔE>3.3) after the immersion period (p<0.001). In Maltodextrin, the Empress Direct group presented (4.52+1.23) and Filtek Z350 (4.04+0.66), while after immersion in Whey Protein, they showed (5.34+1.68) and (4.26+1.02), respectively. Conclusion: Sports drinks changed the surface roughness and color stability of the composite resins studied. The Filtek Z350 group showed lower color variation than the Empress Direct composite in both solutions evaluated


Assuntos
Propriedades de Superfície , Bebidas , Resinas Compostas , Suplementos Nutricionais
15.
Rev. Salusvita (Online) ; 38(3): 739-754, 2019.
Artigo em Português | LILACS | ID: biblio-1052038

RESUMO

Introdução: A busca por um padrão de dentes mais brancos tem estimulado o consumo de agentes clareadores e, apesar de ser um tratamento estético conservador, possíveis danos à estrutura oral podem ocorrer com o uso excessivo desses produtos. Objetivo: Discorrer sobre as principais implicações do clareamento dental em consultó rio realizado em dentes vitais, ressaltando os efeitos locais causados tanto nos tecidos moles, quanto nos duros. Metodologia: Trata-se de uma revisão de literatura, realizada nas bases de dados online: Pubmed, Lilacs e Scielo, incluindo artigos originais e de revisão. Utilizando os seguintes descritores: "Esmalte Dentário", "Clareamento Dental", "Clareadores" e "Sensibilidade da dentina". Conclusão: Observou-se que dentre os efeitos adversos, a sensibilidade dentária durante e após o clareamento de dentes vitais ocorre mais frequentemente, seguido da irritação gengival e das alterações da superfície do esmalte.


Introduction: the search for whiter teeth pattern has encouraged the consumption of bleaching agents and, despite being a conservative aesthetic treatment, possible damages to the oral structure can occur with excessive use of bleaching products. Objective: to describe the main implications of the vital tooth bleaching in-office, emphasizing the local effects in the soft and hard tissues. Methods: this is a literature review that used electronic databases: PubMED/ Medline, Lilacs and Scielo, including original and review articles. The following descriptors were used: "Dental Enamel", "Tooth Bleaching", "Bleaching Agents" and "Dentin Sensitivity". Conclusion: It was observed that among the adverse effects tooth sensitivity during and after vital tooth bleaching occur more often, followed the gingival irritation and alteration of the enamel surface.


Assuntos
Esmalte Dentário , Clareamento Dental
16.
J. appl. oral sci ; 27: e20180631, 2019. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1012520

RESUMO

Abstract Extensive restorations in posterior teeth always bring doubts to the clinicians regarding the best protocol, mainly when structures of reinforcement were lost. Objective This study aimed to evaluate the effect of beveling on the fracture resistance and pattern of class II (MOD) restored teeth. Methodology Ninety human premolars were randomly assigned into 9 groups: CTR (control/sound); NC (cavity preparation, non-restored); RU (restored, unbeveled); RTB (restored, entire angle beveling); RPB (restored, partial/occlusal beveling); EC (endodontic access/EA, non-restored); EU (EA, unbeveled); ETB (EA, entire angle beveling); EPB (EA, partial/occlusal beveling). Teeth were restored with Esthet X resin composite and stored in distilled water for 24 h before the inclusion in PVC cylinders. The axial loading tests were performed with 500 kgF at 0.5 mm/min crosshead speed until fracture of the specimens. Fracture resistance and pattern were accessed and data were analyzed using one-way ANOVA and Tukey's HSD test (α=0.05). Results Mean (±SD) failure loads ranged from 136.56 (11.62) to 174.04 (43.5) kgF in the groups tested without endodontic access. For endodontically accessed teeth, fracture resistance ranged from 95.54 (13.05) to 126.51 (19.88) kgF. Beveling of the cavosurface angle promoted the highest fracture resistance values (p<0.05) and prevented catastrophic fractures. Conclusions Cavosurface angle beveling is capable of improving fracture resistance and pattern for both endodonticaly accessed and non-accessed teeth.

17.
Full dent. sci ; 10(40): 74-82, 2019. ilus
Artigo em Português | BBO - Odontologia | ID: biblio-1050363

RESUMO

Atualmente, os procedimentos minimamente invasivos vêm sendo cada vez mais realizados, tanto para restaurações diretas quanto para restaurações indiretas. O surgimento dos laminados cerâmicos minimamente invasivos, comumente conhecidos como "lentes de contatos", permitem a confecção de restaurações cerâmicas com o mínimo de espessura para a cimentação. O sistema CAD/CAM possui muitas vantagens sendo possível confeccionar uma restauração indireta em poucos minutos, diminuindo etapas laboratoriais e, principalmente, a possibilidade de fresar restaurações cerâmicas com pouca espessura. No entanto, o conhecimento e o treinamento prático para utilização desse sistema são fundamentais para o sucesso clínico em casos de facetas minimamente invasivas. O presente relato de caso clínico destaca o insucesso de restaurações minimamente invasivas em dentes anteriores inferiores confeccionadas pelo sistema CAD/CAM e discute a necessidade do conhecimento do software do sistema para evitar o fracasso das restaurações (AU).


Nowadays, the minimally invasive procedures have been realized, for direct restorations as well as for indirect restorations. The appearance of the minimally invasive ceramic laminate veneers, commonly known as "contact lens", allow the construction of ceramic restorations with minimum thickness for cementation. The CAD/CAM system has many advantages being possible to make an indirect restoration obtaining in a few minutes, reducing laboratorial steps and, mainly, the possibility of milling a restoration with little thickness. However, the knowledge and the practical training of this system are fundamental to have clinical success in cases of minimally invasive veneer. The present case report emphasizes the failure of minimally invasive restorations in lower anterior teeth made in the CAD/CAM system and discusses the need to know the system software to avoid failure of restorations (AU).


Assuntos
Humanos , Feminino , Pessoa de Meia-Idade , Desenho Assistido por Computador/instrumentação , Procedimentos Cirúrgicos Minimamente Invasivos/instrumentação , Facetas Dentárias , Diastema , Brasil
18.
Full dent. sci ; 10(40): 83-93, 2019. ilus
Artigo em Português | BBO - Odontologia | ID: biblio-1050371

RESUMO

Endocrowns são coroas confeccionadas utilizando a câmara pulpar como recurso mecânico de retenção, evitando a necessidade de pinos e preparos mais extensos. Essas restaurações podem ser confeccionadas através de diferentes técnicas, dentre elas, a técnica semidireta. Esta técnica consiste na confecção de restauração extrabucal de resina composta, geralmente em modelos rígidos ou flexíveis, e posterior cimentação, sendo uma alternativa que facilita a reprodução anatômica, acabamento e polimento da restauração e menor custo para o paciente. O objetivo deste trabalho é relatar um caso clínico de paciente com molar extensamente destruído e tratado endodonticamente, em que uma restauração do tipo Endocrown foi confeccionada através de técnica semidireta. Neste caso, o dente 46 de um paciente do gênero masculino, de 33 anos, foi preparado com pontas diamantadas tronco-cônicas, de modo a se obter um preparo ligeiramente expulsivo, este foi moldado com silicona de condensação. Ao molde, foi injetada silicona de adição para obtenção de um modelo flexível para a confecção da restauração. Posteriormente, a restauração foi realizada neste modelo, utilizando-se resina Bulk Fill para preenchimento da cavidade, seguida de dentina A3, aplicação de pigmento ocre e camada de resina de esmalte A2 e, após fotopolimerização, a peça foi cimentada com cimento resinoso. Os procedimentos de acabamento e polimento foram realizados fora da boca e também foi realizado procedimento de pós-polimerização para obtenção de melhores propriedades mecânicas da restauração. A restauração semidireta do tipo Endocrown devolveu função e estética ao molar, com adequada adaptação marginal, garantindo resultados imediatos, baixo custo e conforto ao paciente (AU).


Endocrowns are restorations performed using the pulp chamber for mechanical retention, avoiding more extensive preparations and the need of posts and pins. These restorations can be made through different techniques, among them, the semidirect technique. This technique consists in the preparation of an extraoral restoration of composite resin, usually in rigid or flexible dies followed by cementation, which is an alternative that facilitates the anatomical reproduction, finishing and polishing of the restoration, and lower cost for the patient. The purpose of this paper is to report a clinical case of a patient with extensively destroyed and endodontically treated molars, in which an Endocrown restoration was performed using a semidirect technique. In this case, the tooth 46 of a 33-year-old male patient was prepared with cone-shaped diamond tips in order to obtain a slightly expulsive preparation, the impression was made with condensation silicone, and the flexible die was obtained through addition silicone. Subsequentely, the restoration was performed in this die, using a Bulk Fill resin composite, followed by dentin A3, application of ocher pigment and enamel A2 resin layer and, after photopolymerization, the resin Endocrown was cemented with resin cement. The finishing and polishing procedures were performed outside the mouth and a post-polymerization procedure was also performed to obtain better mechanical properties of the restoration. The semidirect restoration of the Endocrown replaced function and aesthetics to the molar, with adequate marginal adaptation, guaranteeing immediate results, low cost and comfort to the patient (AU).


Assuntos
Humanos , Masculino , Adulto , Resinas Compostas , Restauração Dentária Permanente , Endodontia , Polimerização , Brasil , Radiografia Dentária/instrumentação
19.
Photodiagnosis Photodyn Ther ; 24: 22-26, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30118904

RESUMO

BACKGROUND: The use of hybrid-light (HL) during in-office teeth bleaching can provide faster and reliable results after a single bleaching session, especially if associated with previous acid etching. The present in vivo, interventional, split-mouth, triple-blinded and randomized study evaluated the efficiency of a HL, with and without prior enamel acid etching, assessing the gel application time, degree of color change, sensitivity and treatment stability up to 12 months. METHODS: Thirty-four patients were selected and randomly divided into four groups. The color was evaluated using a spectrophotometer with the CIELab color system, and a VAS questionnaire was used to evaluate the sensitivity. Both upper and lower hemiarches (GI and III) received enamel acid etching with 37% phosphoric acid for 15 s prior to the application of 35% hydrogen peroxide gel (HP). For GI and II, HP was applied on both dental arches for 3-4 consecutive applications and activated by HL (2 × 3' activations with 1' interval); and 3 × 15' (HP) for GIII and IV without HL. Patients returned in 24 h, 1 week, 1-, 6- and 12-months intervals. The clinical operator was different from the clinical measurements operator. RESULTS: After 3-way ANOVA, Tukey's, Wilcoxon and Mann-Whitney tests, all with p < 0.05, no statistical differences were observed between the groups regarding color change (ΔE) and sensitivity in all evaluations. The lowest gel application time was observed for GII (acid etch + HL), followed by GI (HL). CONCLUSIONS: The present study's results reveal the advantages of HL associated with acid etching prior to in office bleaching.


Assuntos
Condicionamento Ácido do Dente/métodos , Peróxido de Hidrogênio/uso terapêutico , Ácidos Fosfóricos/uso terapêutico , Fotoquimioterapia/métodos , Clareadores Dentários/uso terapêutico , Clareamento Dental/métodos , Adolescente , Adulto , Terapia Combinada , Técnicas Cosméticas , Esmalte Dentário/efeitos dos fármacos , Sensibilidade da Dentina , Humanos , Fatores de Tempo , Adulto Jovem
20.
J Mech Behav Biomed Mater ; 85: 170-174, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-29902777

RESUMO

The purpose of this in vitro study was to compare the micro hardness, color stability/ΔE, and degree of conversion/DC of a resin cement light cured through different ceramic spacers. Lithium-disilicate ceramic samples were obtained from IPS E-max CAD blocks (HT A1) and IPS in-Ceram (transparent neutral); and divided in 7 groups (n = 8 for each test): CTR/control group; 06 M/0.6 mm monolithic; 12 M/1.2 mm monolithic; 20 M/2.0 mm monolithic; 06B/0.4 + 0.2 mm bilayered; 12B/1.0 + 0.2 mm bilayered; 20B/1.8 + 0.2 mm bilayered. The resin cement (Variolink veneer) was light cured through the ceramic spacers. The resin cement samples were evaluated for ΔE using a spectrophotometer after 24 h, 7days and after aging (24 h in water at 60 °C). Knoop microhardness and DC tests were conducted immediately after light curing, after 24 h and 7days. All experimental groups showed similar microhardness values, although being lower than CTR group. Similar results were observed after 7days. ΔE was similar between all groups after 24 h (except for 12B and 20B), and increased for all groups after 7days and after artificial aging, especially for thicker and bilayer groups. Only 06 M showed values similar to CTR group. DC values were similar to all groups immediately after light curing, increasing after 24 h and 7days. After 7days, only group 20B showed lower DC than CTR group. A tendency of higher DC could be observed for monolithic and thinner ceramics. All test results showed strong correlation (0.9987). Ceramic interposition can reduce mechanical and physical properties of resin cements, especially with thicker and bilayered ceramics. Group 06 M showed the best ΔE overtime.


Assuntos
Cerâmica/química , Luz , Fenômenos Mecânicos , Cimentos de Resina/química , Porcelana Dentária/química , Fatores de Tempo
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