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1.
Artigo em Inglês | MEDLINE | ID: mdl-34712404

RESUMO

Background. Direct pulp capping is a method designed to preserve the exposed dental pulp. Due to good biological, physical, and mechanical properties, new versions of calcium silicate-based materials have been developed as pulp capping materials. The present study aimed to evaluate the cytotoxic effects of four calcium silicate-based pulp capping materials, of which the Bio-C Repair Íon+ is still in an experimental phase. Methods. Biodentine, MTA Repair HP, Bio-C Repair, and Bio-C Repair Íon+ cements were dispensed in a metallic matrix to produce 125-mm3 specimens, which were immersed in Dulbecco's Modified Eagle Medium (DMEM) to obtain extracts. NIH 3T3 cells were cultured and exposed to the extracts for 24 hours and seven days. Cell viability was assessed by the methyl tetrazolium test (MTT). The mean values for the experimental and control groups (without treatment) were compared by analysis of variance (ANOVA) and post hoc Tukey tests, considering a significance level of 5%. Results. All the tested materials demonstrated a reduction in cell viability (P < 0.05). According to ISO 10993-5: 2009 (E), Bio-C Repair Íon+ exhibited mild and moderate cytotoxicity in the 24- hour and 7-day analyses, respectively. Bio-C Repair and Biodentine showed mild cytotoxicity, and MTA Repair HP exhibited moderate cytotoxicity at both intervals. Conclusion. The highest cell viability was demonstrated by Biodentine, MTA, and Repair HP, in descending order. Bio-C Repair and Bio-C Repair Íon+ showed moderate cytotoxicity, similar to MTA Repair HP in the 7-day analysis.

2.
Biomed Res Int ; 2021: 9987860, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34195290

RESUMO

Purpose: The potential of UV-mediated photofunctionalization to enhance the resin-based luting agent bonding performance to aged materials was investigated. Methods: Sixty samples of each material were prepared. Yttria-stabilized zirconia (YZr) and Pd-Au alloy (Pd-Au) plates were fabricated and sandblasted. Lithium disilicate glass-ceramic (LDS) was CAD-CAM prepared and ground with #800 SiC paper. Half of the specimens were immersed in machine oil for 24 h to simulate the carbon adsorption. Then, all of the specimens (noncarbon- and carbon-adsorbed) were submitted to UV-mediated photofunctionalization with a 15 W UV-LED (265 nm, 300 mA, 7692 µW/cm2) for 0 (control groups), 5, and 15 min and subjected to contact angle (Ɵ) measurement and bonded using a resin cement (Panavia™ V5, Kuraray Noritake, Japan). The tensile bond strength (TBS) test was performed after 24 h. The Ɵ (°) and TBS (MPa) data were statistically analyzed using two-way ANOVA and Bonferroni correction tests (α = 0.05). Results: In the carbon-adsorbed groups, UV-mediated photofunctionalization for 5 min significantly decreased Ɵ of all materials and increased TBS of YZr, and UV for 15 min significantly increased the TBS of LDS and Pd-Au. In noncarbon-adsorbed groups, UV-photofunctionalization did not significantly change the Ɵ or TBS except YZr specimens UV-photofunctionalized for 15 min. Conclusion: UV-mediated photofunctionalization might have removed the adsorbed hydrocarbon molecules from the materials' surfaces and enhanced bond strengths of Panavia™ V5 to YZr, LDS, and Pd-Au. Additionally, UV-mediated photofunctionalization improved the overall TBS of YZr. Further investigation on the optimum conditions of UV photofunctionalization on indirect restorative materials should be conducted.


Assuntos
Ligas Dentárias , Fotoquímica/métodos , Cimentos de Resina/química , Adsorção , Carbono , Cerâmica , Desenho Assistido por Computador , Colagem Dentária , Porcelana Dentária , Análise do Estresse Dentário , Ouro/química , Humanos , Hidrocarbonetos/química , Teste de Materiais , Paládio/química , Estudos Prospectivos , Propriedades de Superfície , Resistência à Tração , Raios Ultravioleta , Ítrio/química , Zircônio/química
3.
Dent Mater J ; 39(6): 970-975, 2020 Dec 03.
Artigo em Inglês | MEDLINE | ID: mdl-32611987

RESUMO

To assess, in vitro, the influence of heat air treatment on cytotoxicity and degree of conversion (DC) of universal self-etch adhesives (Ambar Universal APS, Scotchbond Universal Adhesive, and Tetric N-Bond Universal) in an NIH/3T3 fibroblast cell culture. Samples were divided into three groups: 1) no heat treatment (control), 2) 37°C and 3) 60°C heat treatment before photopolymerization. Cytotoxicity was analyzed by MTT assay and the DC by FTIR. All adhesives heated at 60°C showed reduced cytotoxicity levels when compared with those heated at 37°C. In general, DC of Ambar Universal APS presented the highest DC than Scotchbond Universal Adhesive and Tetric N-Bond Universal, and the hot air treatment do not influence the conversion. Heat treatment at 60°C was able to reduce the cytotoxicity of universal self-etch adhesives, even, the heat treatment does not enhances the DC.


Assuntos
Colagem Dentária , Adesivos , Cimentos Dentários , Dentina , Adesivos Dentinários , Temperatura Alta , Teste de Materiais , Polimerização , Cimentos de Resina
4.
J Clin Exp Dent ; 12(3): e215-e219, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32190190

RESUMO

Background: The light-cured calcium hydroxide based cements have incomplete polymerization and unconverted monomers can cause pulp cell damage. The aim of this study was to evaluate the influence of a warm and hot air stream on the cytotoxicity of light-cured calcium hydroxide based cements. Material and Methods: The materials Dycal (conventional cement), Biocal, Hidrox-Cal, and Ultra-Blend Plus (light-cured calcium hydroxide cements) were submitted to cytotoxicity analysis after polymerization, without vs. with previous heat treatment with a warm (37°C) and a hot (60°C) air stream. Following polymerization, cements were maintained in culture medium for 24 hours and 7 days, and subjected to the MTT test. Data were analyzed using analysis of variance (ANOVA) followed by post-hoc Student-Newman-Keuls (<0.05). Results: The results indicated significant differences between the materials according to their composition, i.e., light-cured cements treated with a jet of warm air showed similar cytotoxicity levels to those observed for conventional cement, suggesting that they may be considered alternatives in cases requiring pulp-capping treatment. Conclusions: Application of a hot air stream reduced cytotoxicity of materials tested. Key words:Dental pulp capping, dental cements, calcium hydroxide, cell survival.

5.
Dent Mater J ; 38(6): 892-899, 2019 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-31366768

RESUMO

The purpose was to evaluate the effect of a hydrophilic amide monomer on µTBS of one-step adhesive to dentin at different application times. Clearfil Universal Bond Quick (UBQ), experimental adhesive (UBQexp; same compositions as UBQ but hydrophilic amide monomer was replaced with 2-hydroxyethyl methacrylate), Clearfil SE ONE and Clearfil SE Bond were applied to midcoronal dentin prepared with 600-grit SiC at different application time (0, 10, 20 and 40 s). Water sorption (Wsp) and the ultimate tensile strength (UTS) of polymerized adhesives were also measured. UBQ showed significantly lower Wsp and higher UTS than UBQexp. At each application time, UBQ exhibited significantly higher µTBSs than UBQexp. UBQ showed the highest µTBS at 0 s application time among all the adhesives. When the application time was prolonged from 0 s to 10 s, only UBQ showed no significant difference. The hydrophilic amide monomer increased µTBS with reduction in Wsp and increase in the UTS and may allow a shortened application time.


Assuntos
Colagem Dentária , Amidas , Resinas Compostas , Cimentos Dentários , Dentina , Adesivos Dentinários , Teste de Materiais , Cimentos de Resina , Resistência à Tração
6.
Dent Mater ; 35(7): e153-e161, 2019 07.
Artigo em Inglês | MEDLINE | ID: mdl-31078308

RESUMO

OBJECTIVES: Ultra-high-speed (UHS) videography was used to visualize the fracture phenomena at the resin-dentin interface during micro-tensile bond strength (µTBS) test. We also investigated whether UHS videography is applicable for failure-mode analysis. METHODS: Ten human mid-coronal dentin surfaces were bonded using Clearfil SE Bond either in self-etching (SE) or etch-and-rinse (ER) mode. After 24-h water storage, the samples were cut into beams for µTBS test and tested at a cross-head speed of 1 mm/min. The fracture phenomena at the bonded interface were captured using a complementary metal-oxide-semiconductor digital UHS camera at 299,166 frames per second. The failure modes were classified using UHS videography, followed by scanning electron microscopy (SEM) analysis. The failure-mode distributions determined by UHS videography and SEM analysis were statistically analyzed using Fisher's exact test with Bonferroni correction. RESULTS: The crack-propagation speed exceeded 1,500 km/h. No significant difference was found between the SEM and UHS videography failure-mode distributions in the SE mode. A significant difference appeared between them in the ER mode. Significant differences in the incidence of cohesive failures within the adhesive and at the adhesive-composite interface between the SE and ER modes were identified by both SEM and UHS videography. SIGNIFICANCE: UHS videography enabled visualization of the fracture dynamics at the resin- dentin interfaces under tensile load. However, the resolution at such high frame rate was insufficient to classify the failure mode as precisely as that of SEM. Nevertheless, UHS videography can provide more detailed information about the fracture origin and propagation.


Assuntos
Colagem Dentária , Adesivos Dentinários , Resinas Compostas , Dentina , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Cimentos de Resina , Estresse Mecânico , Propriedades de Superfície , Resistência à Tração
7.
Stomatos ; 24(47): 51-55, 2018/11/23.
Artigo em Português | LILACS-Express | LILACS | ID: biblio-988474

RESUMO

Este artigo, de cunho teórico, discute a construção do conhecimento em Odontologia no contexto da Sociedade em Rede, aproximando essa temática ao ponto de vista de alguns autores das Ciências Sociais Contemporâneas em voga. A bibliografia especializada aponta que a sociedade vive em uma constante transformação. Prova disso é que a construção de conhecimento pedagógico em Odontologia se dá hoje com maior intensidade na internet, principalmente nas mídias sociais, do que através da busca em livros. Por essa nova forma de agregar conhecimento ser uma realidade, é de fundamental importância que pessoas qualificadas sejam vetores de transmissão desses conhecimentos, de uma forma didática e com embasamento científico. Além disso, cabe aos professores se adaptarem ao novo estilo de construção do conhecimento pedagógico, elaborando aulas mais interativas e com o auxílio de ferramentas que chamem a atenção dos seus alunos e, concomitante a isso, ofereçam-lhes informações de qualidade.


This theoretical article discusses the construction of knowledge in dentistry in the context of the Network Society, bringing this theme closer to the point of view of some contemporary Social Science writers, nowadays in vogue. The specialized bibliography indicates that the society lives in a constant transformation, proof of this is that the construction of pedagogical knowledge in dentistry occurs today with greater intensity in the internet, mainly in the social media, than through the search in books. Because this new form of knowledge aggregation is a reality, it is of fundamental importance that qualified people are vectors of transmission of this knowledge, in a didactic and scientific basis. In addition, it is up to teachers to adapt to the new style of construction of pedagogical knowledge, developing more interactive classes and with the help of tools that attract the attention of their students and, at the same time, offer them quality information.

8.
Eur J Dent ; 12(2): 281-286, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29988221

RESUMO

Objective: The aim of the study was to assess, in vitro, the influence on cytotoxicity of heat treatment applied before photopolymerization, while mixing three self-adhesive resin cements, in an NIH/3T3 fibroblast cell culture, based on cell viability measures. Methods: Samples were divided into three groups: (1) no heat treatment while mixing (control), (2) 37°C, and (3) 60°C heat treatment while mixing. Cements were light-cured immediately after mixing and immersed in Dulbecco's Modified Eagle Media for the extraction of possibly uncured products after 24 h and 7 days. Cultures contained 0.5 mL of NIH/3T3 fibroblasts per well at a concentration of 0.4 × 105 cells/mL and specific extracts for each sample. Statistical Analysis Used: Data were statistically analyzed with ANOVA and post hoc Student-Newman-Keuls (significance of 5%). Results: Cement cytotoxicity increased with time, as shown by the higher values observed at 7 days. There was a slight difference in intragroup cytotoxicity levels between 24 h and 7 days. Heat treatment at 60°C was associated with a major decrease in cytotoxicity levels in all three groups, both at 24 h and at 7 days, with no differences among the cements. Conclusions: Heat treatment at 60°C should be considered as a strategy to reduce cytotoxicity of self-adhesive resin cements, as evidenced by the results observed at 24 h and 7 days of analysis.

9.
J Clin Exp Dent ; 10(5): e499-e501, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29849976

RESUMO

The burning mouth syndrome (BMS) has no specific clinical and laboratory signs. Its etiology is yet to be elucidated, but it is considered to be affected by multifactorial, psychological, and local and systemic factors. This condition is considered of great morbidity, and the main complaint of patients maybe associated with xerostomia, thirst, and altered taste. The present study aims to report two cases of BMS and to evaluate the outcome of cognitive therapy (CT) plus phytotherapy in the control of BMS. The patients were female, Caucasian, and aged between 58 and 69 years. The most BMS-affected anatomical parts were the lips and the tongue. In the clinical approach, oral and systemic evaluation, and disease management with CT plus chamomile tea were done. The patients were reassured, and their response to therapy one year after was found to be excellent despite few exacerbations in periods of great emotional stress. Thus, we conclude that psychological treatment is vital in the management of BMS, as CT, along with Matricaria recutita phytotherapy, displayed excellent results in the control of BMS. Key words:Anxiety, chamomile tea, xerostomia, psychosomatic.

10.
J. health sci. (Londrina) ; 18(3): 183-187, 31/07/2016.
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-831803

RESUMO

Avaliou-se a durabilidade da adesão de adesivos autocondicionantes à dentina após evaporação dos solventes com jato de ar frio e quente. Os sistemas adesivos Clearfil 3S Bond e OptiBond All-In-One foram aplicados em superfícies planas de dentina, a evaporação dos solventes feita com ar quente (60±2 o C) ou ar frio (20±2 o C), seguindo-se fotoativação (600mW/cm2 por 10 s) e restauração com compósito (3 x 2 mm). Após armazenagem em água destilada (24 horas / 37 o C), as amostras foram seccionadas para obtenção de paralelogramos de 0,8 mm2 para testar em tração (0,5mm/min) em 24 horas e 6 meses. Dois paralelogramos de cada grupo experimental foram preparados para observar a nanoinfiltração na interface com a dentina. Os valores médios da resistência adesiva (em MPa) de cada grupo foram tratados por Análise de Variância de três fatores e teste de Tukey (5%), sendo o dente a unidade experimental. Foi observada maior adesão após evaporação dos solventes com ar quente (p=0.000) no tempo de 24 horas de armazenagem (0.003). Não houve diferenças para o tipo de adesivo (p=0.343) e nem para a interação adesivo X tempo X temperatura de evaporação do solvente (p>0,05). Concluiu-se que a durabilidade da adesão foi influenciada pela temperatura de evaporação do jato de ar


To evaluate the bonding longevity of one-step self-etch adhesive systems to dentin, after solvent evaporation with warm or cold airstream. Clearfil 3S Bond and OptiBond All-In-One adhesives were applied on flat dentin surfaces, solvent evaporation was performed with a warm (60±2 o C) or cold air (20±2 o C), the surfaces were light cured (600mW/cm2 during 10 s), and blocks of compositeres min were built (3 x 2mm). After storage in distilled water (24-hour at 37 o C), the samples were sectioned into 0.8 mm2 sticks and tested in tensile (0.5 mm/min) at 24-hour and 6-month periods. Two sticks from each experimental group were prepared for nanoleakage observation of the bond interface. The mean bond strength values of experimental groups (in MPa) were subjected to a three- way Analysis of Variance and post-hoc Tukey´s test (5%), using tooth as the experimental unit. Higher bond strength was observed with warm air (p=0.000) for solvent evaporation, and 24 hour of water storage (0.003. No significant differences were observed for both the adhesive systems (p=0.343) and interactions.The bonding durability was influenced by the air temperature for solvent evaporation

11.
Eur J Dent ; 8(2): 205-210, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24966771

RESUMO

OBJECTIVE: This study evaluated the effect of air temperature (warm or cold) for solvent evaporation on bonding and nanoleakage of self-etching adhesives to dentin. MATERIALS AND METHODS: The adhesives Clearfil 3S Bond [S3], OptiBond All-In-One [OB], Adper SE Plus [AD], and Silorane adhesive [SI] were applied on dentin surfaces, and a warm (60 ± 2°C) or cold air (20 ± 1°C) was applied and light-cured. After water storage (24 h), the teeth were sectioned into sticks (0.8 mm(2)) and tested in tensile. Then, they were immersed in a 50% solution of silver nitrate, photo-developed and the nanoleakage observed in a scanning electron microscope. The bond strength and nanoleakage pattern were analyzed by two-way analysis of variance and post hoc Tukey's test (α =0.05). RESULTS: Higher bond strength and lower silver nitrate uptake were observed for the adhesives under warm condition (P < 0.05). AD and SI showed better adhesive results than S3 and OB (P < 0.05). CONCLUSION: The use of a warm air was useful to improve the bonding and diminish the nanoleakage of adhesive systems to dentin.

12.
Rev. Assoc. Paul. Cir. Dent ; 67(4): 272-277, out.-dez. 2013. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: lil-707533

RESUMO

Os traumatismos dentários são situações de urgência odontológica que impõem ao profissional um atendimento rápido, porém minucioso. Apesar da agilidade no primeiro atendimento, na maioria das vezes é necessário o acompanhamento do paciente por um longo período. O objetivo deste trabalho é relatar o caso de um menino que compareceu ao atendimento de urgência da Clínica Infantil da Universidade Luterana do Brasil (Ulbra) - campus Cachoeira do Sul/RS - Brasil, com várias lesões decorrentes de uma queda de bicicleta. O paciente chegou 24 horas após o trauma com vária lacerações faciais que já haviam sido suturadas no hospital anteriormente. Os dentes envolvidos, o 11, 12, 13,21,22 e 23, apresentavam lesões de fratura coronária, subluxação e luxação extrusiva Realizou-se uma radiografia da região e não se detectou fratura radicular ou da tábua óssea vestibular. No primeiro atendimento, optou-se pela confecção de uma contenção semirrígida manto por três semanas, pois alguns dentes estavam com grande mobilidade. Desde o atendimento de urgência o paciente vem sendo acompanhado e tratado na Universidade. Podemos concluir que o tratamento de urgência é bastante complexo, uma boa anamnese, um bom exame clínico e exames complementares são indispensáveis na instituição de um plano de tratamento rápido e adequada. O prognóstico é muitas vezes duvidoso, podendo envolver várias especialidades odontológicas e se torna mais favorável quando o profissional tem conhecimento, agilidade no tratamento de urgência e faz o encaminhamento correto do paciente quando necessário.


Dental injuries are emergencies that require the dental professional a fast, but thorough. Despite the agility in primary care, most often it is necessary to monitor the patient for a long perio The objective of this study is to report the case of a boy who attended the emergency care of theChildren's Clinic Lutheran University of Brazil (Ulbra) - campus Cachoeira do Sul/RS - Brazil, with multiple injuries resulting from a fali from a bike. The patient arrived 24 hours after the trauma with multiple facial lacerations that had been sutured to the hospital previously. The teeth involved, 11, 12, 13,21,22 and 23, had lesions of coronary fracture, extrusive luxation and subluxation. Was held radiography of the region was not detected root fracture or buccal bone plate. In the firs visit, it was decided for the construction of a semi-rigid containment maintained for three weeksi because some teeth were highly mobile. From the urgent care the patient has been followed an treated at the University. We can conclude that emergency treatment is quite complex, a good clinical history, a good clinical examination and exams are essential in establishing a plan for prompt and appropriate treatment. The prognosis is often uncertain, may involve various dental specialti and becomes more favorable when the professional's knowledge, speed in emergency treatmen and makes the correct routing of the patient when needed.


Assuntos
Humanos , Masculino , Adolescente , Emergências , Traumatismos Dentários/terapia
13.
J Appl Oral Sci ; 21(1): 80-4, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23559117

RESUMO

OBJECTIVES: This study aimed to compare the micro-tensile bond strength of methacrylate resin systems to a silorane-based restorative system on dentin after 24 hours and six months water storage. MATERIAL AND METHODS: The restorative systems Adper Single Bond 2/Filtek Z350 (ASB), Clearfil SE Bond/Z350 (CF), Adper SE Plus/Z350 (ASEP) and P90 Adhesive System/Filtek P90 (P90) were applied on flat dentin surfaces of 20 third molars (n=5). The restored teeth were sectioned perpendicularly to the bonding interface to obtain sticks (0.8 mm2) to be tested after 24 hours (24 h) and 6 months (6 m) of water storage, in a universal testing machine at 0.5 mm/min. The data was analyzed via two-way Analysis of Variance/Bonferroni post hoc tests at 5% global significance. RESULTS: Overall outcomes did not indicate a statistical difference for the resin systems (p=0.26) nor time (p=0.62). No interaction between material × time was detected (p=0.28). Mean standard-deviation in MPa at 24 h and 6 m were: ASB 31.38 (4.53) and 30.06 (1.95), CF 34.26 (3.47) and 32.75 (4.18), ASEP 29.54 (4.14) and 33.47 (2.47), P90 30.27 (2.03) and 31.34 (2.19). CONCLUSIONS: The silorane-based system showed a similar performance to methacrylate-based materials on dentin. All systems were stable in terms of bond strength up to 6 month of water storage.


Assuntos
Adesivos Dentinários/química , Dentina/química , Metacrilatos/química , Resinas de Silorano/química , Resinas Compostas/química , Colagem Dentária/métodos , Cimentos Dentários/química , Humanos , Teste de Materiais , Cimentos de Resina/química , Propriedades de Superfície , Resistência à Tração , Fatores de Tempo , Água
14.
J. appl. oral sci ; 21(1): 80-84, 2013. tab
Artigo em Inglês | LILACS, BBO - Odontologia | ID: lil-685000

RESUMO

Objectives: This study aimed to compare the micro-tensile bond strength of methacrylate resin systems to a silorane-based restorative system on dentin after 24 hours and six months water storage. Material and Methods: The restorative systems Adper Single Bond 2/Filtek Z350 (ASB), Clearfil SE Bond/Z350 (CF), Adper SE Plus/Z350 (ASEP) and P90 Adhesive System/Filtek P90 (P90) were applied on flat dentin surfaces of 20 third molars (n=5). The restored teeth were sectioned perpendicularly to the bonding interface to obtain sticks (0.8 mm2) to be tested after 24 hours (24 h) and 6 months (6 m) of water storage, in a universal testing machine at 0.5 mm/min. The data was analyzed via two-way Analysis of Variance/Bonferroni post hoc tests at 5% global significance. Results: Overall outcomes did not indicate a statistical difference for the resin systems (p=0.26) nor time (p=0.62). No interaction between material × time was detected (p=0.28). Mean standard-deviation in MPa at 24 h and 6 m were: ASB 31.38 (4.53) and 30.06 (1.95), CF 34.26 (3.47) and 32.75 (4.18), ASEP 29.54 (4.14) and 33.47 (2.47), P90 30.27 (2.03) and 31.34 (2.19). Conclusions: The silorane-based system showed a similar performance to methacrylate-based materials on dentin. All systems were stable in terms of bond strength up to 6 month of water storage.


Assuntos
Humanos , Adesivos Dentinários/química , Dentina/química , Metacrilatos/química , Resinas Compostas/química , Colagem Dentária/métodos , Cimentos Dentários/química , Teste de Materiais , Cimentos de Resina/química , Propriedades de Superfície , Resistência à Tração , Fatores de Tempo , Água
15.
J Appl Oral Sci ; 20(2): 174-9, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22666833

RESUMO

OBJECTIVE: This randomized double-blind clinical trial compared the performance of posterior composite restorations with or without bevel, after 1-year follow-up. MATERIAL AND METHODS: Thirteen volunteers requiring at least two posterior composite restorations were selected. Twenty-nine cavities were performed, comprising 14 without bevel (butt joint) and 15 with bevel preparation of the enamel cavosurface angle. All cavities were restored with simplified adhesive system (Adper Single Bond) and composite resin (Filtek P60). A halogen light curing unit was used through the study. Restorations were polished immediately. Analysis was carried out at baseline, after 6 months and after 1 year by a calibrated evaluator (Kappa), according to the FDI criteria. Data were statistically analyzed by Mann-Whitney test (p <0.05). RESULTS: Beveled and non-beveled cavities performed similarly after 1 year follow-up, regarding to fractures and retention, marginal adaptation, postoperative hypersensitivity, recurrence of caries, surface luster and anatomic form. However, for surface and marginal staining, beveled cavities showed significantly better performance (p<0.05) than butt joint restorations. CONCLUSIONS: It was concluded that the restorations were acceptable after 1 year, but restorations placed in cavities with marginal beveling showed less marginal staining than those placed in non-beveled cavities.


Assuntos
Resinas Compostas/uso terapêutico , Preparo da Cavidade Dentária/métodos , Restauração Dentária Permanente/métodos , Adulto , Cimentos Dentários/uso terapêutico , Adaptação Marginal Dentária , Método Duplo-Cego , Feminino , Seguimentos , Humanos , Masculino , Estatísticas não Paramétricas , Propriedades de Superfície , Resultado do Tratamento
16.
Rev. Fac. Odontol. Porto Alegre ; 53(1): 17-20, jan.-abr. 2012. tab
Artigo em Português | LILACS, BBO - Odontologia | ID: lil-719541

RESUMO

Objetivo: o presente estudo realizou uma análise comparativa da resistência ao cisalhamento em dentina após diferentes tratamentos de superfície do cerômero BelleGlass HP (Kerr). Materiais e métodos: para isso, trinta molares humanos tiveram suas faces livres desgastadas até expor a superfície dentinária, nas quais foram cimentados os corpos de prova (belleGlass HP) com cimento resinoso (RelyX ARC, 3M ESPE), com três tratamentos de superfície: grupo 1 (controle): sem tratamento de superfície; grupo 2: condicionamento com ácido fluorídrico 10%; e grupo 3: jateamento com óxido de alumínio com granulação de 50um. Os espécimes foram avaliados em relação à resistência de união por cisalhamento, com velocidade de 1,0mm/min. Os dados foram analisados estatisticamente através dos testes ANOVA e Tukey, com nível de significância de 5%. Resultados: como resultado, obteve-se diferenças estatisticamente significativas (P=0,002) entre o grupo controle e o grupo 3. Conclusão: concluiu-se que o tipo de tratamento de superfície do cerômero Belleglass influenciou a resistência de união dos espécimes cimentados, sendo o jateamento com óxido de alumínio o que apresentou melhor desempenho


Aim: The present study showed a comparative analysis of shear bond strength of a ceromer after different surface treatments. Material and methods: For that, thirty human molars had their free surfaces drilled until exposing the dentin tissue, where the ceromer specimen were cemented (belleGlass HP), with three surface treatments before cementation: control group, without surface treatment (group 1); group 2: etched with fluoridric acid (10%) and group 3: etched with aluminum oxide jet (50um). All groups were tested in a universal testing machine, with 1mm/min crosshead speed, in a shear bond strength test. Data were analysed by ANOVA and Tukey tests. Results: It was shown statistically significant differences (p=0.002) between control group and group 3. Conclusions: Ceromer surface treatment Intervenes on shear bond strength to dentin, being the aluminium oxide jet the best way to improve bond strength.


Assuntos
Óxido de Alumínio , Resinas Compostas , Cimentos Dentários , Ácido Fluorídrico , Resistência ao Cisalhamento
17.
J. appl. oral sci ; 20(2): 174-179, Mar.-Apr. 2012. tab
Artigo em Inglês | LILACS | ID: lil-626417

RESUMO

OBJECTIVE: This randomized double-blind clinical trial compared the performance of posterior composite restorations with or without bevel, after 1-year follow-up. MATERIAL AND METHODS: Thirteen volunteers requiring at least two posterior composite restorations were selected. Twenty-nine cavities were performed, comprising 14 without bevel (butt joint) and 15 with bevel preparation of the enamel cavosurface angle. All cavities were restored with simplified adhesive system (Adper Single Bond) and composite resin (Filtek P60). A halogen light curing unit was used through the study. Restorations were polished immediately. Analysis was carried out at baseline, after 6 months and after 1 year by a calibrated evaluator (Kappa), according to the FDI criteria. Data were statistically analyzed by Mann-Whitney test (p <0.05). RESULTS: Beveled and non-beveled cavities performed similarly after 1 year follow-up, regarding to fractures and retention, marginal adaptation, postoperative hypersensitivity, recurrence of caries, surface luster and anatomic form. However, for surface and marginal staining, beveled cavities showed significantly better performance (p<0.05) than butt joint restorations. CONCLUSIONS: It was concluded that the restorations were acceptable after 1 year, but restorations placed in cavities with marginal beveling showed less marginal staining than those placed in non-beveled cavities.


Assuntos
Adulto , Feminino , Humanos , Masculino , Resinas Compostas/uso terapêutico , Preparo da Cavidade Dentária/métodos , Restauração Dentária Permanente/métodos , Adaptação Marginal Dentária , Método Duplo-Cego , Cimentos Dentários/uso terapêutico , Seguimentos , Estatísticas não Paramétricas , Propriedades de Superfície , Resultado do Tratamento
18.
J Adhes Dent ; 13(3): 235-41, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21734956

RESUMO

PURPOSE: This study evaluated the effect of prolonged polymerization times on the microtensile resin-dentin bond strength (µTBS), degree of conversion of adhesive films (DC) and silver nitrate uptake (SNU) for an ethanol/water- (Adper Single Bond 2, [SB]) and an acetone-based (One Step Plus, [OS]) etch-and-rinse adhesive. MATERIALS AND METHODS: Thirty caries-free extracted molars were included in this study. The occlusal enamel of all teeth was removed by wet grinding the occlusal enamel on 180-grit SiC paper. Adhesives were applied according to the manufacturer's instructions, but they were light cured for 10, 20 and 40 s at 600 mW/cm2. Bonded sticks (0.6 mm2) were tested in tension (0.5 mm/min). Two bonded sticks from each tooth were immersed in an ammoniacal solution of silver nitrate (24 h), photodeveloped (8 h), and analyzed by SEM. The DC of the adhesives was evaluated under Fourier Transformed Infra-Red spectroscopy (FTIR). Data for each property were analyzed by two-way ANOVA and Tukey's test (α = 0.05). RESULTS: Statistically higher µTBS and DC were observed for SB and OS when both adhesives were light cured for 40 s in comparison with 10 s. For OS, the µTBS in the 20- and 40-s groups did not differ statistically, while for SB it did. Higher prolonged exposure times did not prevent nanoleakage within the hybrid layer for all groups regardless of the adhesive. CONCLUSION: This study supports the hypothesis that exposure times longer than those recommended can improve the degree of conversion of adhesive films and the immediate resin-dentin bonds. The prolonged curing times (20 and 40 s) for polymerization of simplified adhesives resulted in an increase in the degree of conversion of the adhesive films and resin-dentin bond strengths but did not reduce the nanoleakage within the hybrid layer.


Assuntos
Colagem Dentária , Infiltração Dentária , Dentina , Cura Luminosa de Adesivos Dentários/métodos , Cimentos de Resina , Condicionamento Ácido do Dente/métodos , Adesividade , Análise de Variância , Cimentos Dentários , Análise do Estresse Dentário , Adesivos Dentinários , Dureza , Humanos , Teste de Materiais , Metacrilatos , Dente Molar , Transição de Fase , Prata/metabolismo , Nitrato de Prata/metabolismo , Espectroscopia de Infravermelho com Transformada de Fourier , Estatísticas não Paramétricas , Resistência à Tração , Fatores de Tempo
19.
Braz Dent J ; 21(4): 327-31, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20976383

RESUMO

The aim of this study was to evaluate the fracture strength of teeth with different cavosurface margin cavity preparations and restored with composite resin and different adhesive systems. Eighty premolars were randomly divided in 8 groups, as follow: G1- sound teeth; G2- MOD preparation (no restoration); G3- Adper Single Bond without bevel preparation (butt joint); G4- Adper Single Bond with bevel preparation; G5- Adper Single Bond with chamfer preparation; G6- Clearfil SE Bond without bevel (butt joint); G7- Clearfil SE Bond with bevel preparation; G8- Clearfil SE Bond with chamfer preparation. The adhesive systems were applied according to manufacturers' instructions. Composite resin (Filtek Z250) was incrementally placed in all cavities. After 24 h, the specimens were tested in a universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by ANOVA and Tukey's test (fracture strength) and Fisher's exact test (fracture pattern). The confidence level was set at 95% for all tests. Prepared and non-restored teeth showed the worst performance and G4 exhibited the highest fracture strength among all groups (p<0.05). In conclusion, all restorative treatments were able to recover the fracture strength of non-restored teeth to levels similar to those of sound teeth. Using a total-etch adhesive system with bevel preparation significantly improved the resistance to fracture.


Assuntos
Preparo da Cavidade Dentária/métodos , Cimentos Dentários/uso terapêutico , Adaptação Marginal Dentária , Restauração Dentária Permanente/efeitos adversos , Fraturas dos Dentes/etiologia , Análise de Variância , Dente Pré-Molar , Resinas Compostas/uso terapêutico , Força Compressiva , Colagem Dentária/métodos , Preparo da Cavidade Dentária/instrumentação , Instrumentos Odontológicos , Restauração Dentária Permanente/métodos , Análise do Estresse Dentário , Humanos , Cimentos de Resina/uso terapêutico , Estatísticas não Paramétricas
20.
Stomatos ; 16(30)jan.-jun. 2010.
Artigo em Português | LILACS | ID: lil-565175

RESUMO

O objetivo desse trabalho foi avaliar clinicamente a eficácia do clareamento dental com peróxido de carbamida a 16%, utilizando a técnica caseira com e sem alívio na moldeira, e analisar a hipersensibilidade dentinária provocada pelo procedimento clareador. Esse estudo randomizado, duplo-cego e com desenho experimental de boca dividida avaliou onze pacientes, sendo os dentes 11 e 21 avaliados previamente por dois examinadores calibrados (Kappa 0,75). A hemi-arcada direita recebeu alívio no modelo de gesso para a confecção da moldeira, enquanto a esquerda não recebeu. O clareamento foi realizado durante 2 semanas, 6 horas por dia. Logo após esse período, os dentes 11 e 21 foram reavaliados pelos mesmos examinadores e os pacientes foram questionados sobre a hipersensibilidade. Os dados foram analisados pelo teste exato de Fisher (p>0,05) e mostraram que não houve diferença significativa no clareamento entre as técnicas com e sem alívio. Todos os pacientes relataram hipersensibilidade dentinária durante o clareamento. Concluiu-se que a técnica caseira foi eficaz no clareamento dental, independentemente da presença do alívio na moldeira. O clareamento provocou hipersensibilidade dentinária em todos os casos.


The aim of this study was to evaluate the clinical performance of 16% carbamide peroxide home vital bleaching, using trays constructed with or without reservoirs, and analyze thepostoperative hypersensitivity. This was a randomized, double-blind and split-mouth study. Two examinators evaluated 11 and 21 teeth from eleven patients (Kappa 0,75). Right side of upper stone models received reservoirs before trays were constructed, left side didn’t. Home bleaching was performed through two weeks, 6 hours-day. After this time, 11 and 21 teeth was evaluatedagain by the same examinators. Patients were asked about ostoperative hypersensitivity. Data were statistically analyzed by Fisher’s exact test (p>0,05), and didn’t show any statistically significant difference between trays with or without reservoirs. All patients related postoperative hypersensitivity during bleaching time. Home bleaching technique was effective on dental bleaching, with or without reservoirs on the trays. Home bleaching promoted postoperative hypersensitivityin all cases.


Assuntos
Clareamento Dental/efeitos adversos , Clareamento Dental/métodos , Sensibilidade da Dentina , Peróxidos/efeitos adversos , Materiais para Moldagem Odontológica , Estética Dentária
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