Shear Bond Strength and Adhesive Remnant of Three Protocols used for Bonding Orthodontic Brackets

Objective: To test the shear bond strength and the amount of adhesive remnant on the enamel after debonding of a conventional orthodontic composite system, a flowable composite resin, and a self-adhesive resin cement. Material and Methods: Thirty extracted bovine incisors were allocated in three groups, according to the type of adhesive: Group XT (Transbond XT), Group FL (Flow Z350), and Group RX (RelyX U100). All groups had etching with phosphoric acid. Groups XT and FL received primer before adhesive. Stainless steel metal brackets were bonded using the respective adhesive. Teeth were submitted to shear bond strength (SBS) test, followed by measurement of adhesive remnant. Intergroup comparison of SBS values were performed by one-way Anova and Tukey post-hoc test. Kruskal-Wallis test and the Mann-Whitney U-test were used to compare adhesive remnant. Results: Transbond XT presented higher bond strength than RelyX U100 and Flow Z350; all adhesives exhibited bond failure within the adhesive. All groups showed bond failure occurring within the adhesive. Transbond XT and RelyX U100 left significantly more adhesive remnant on the tooth surface than Flow Z350. Conclusion: All three adhesive systems had bond strength above the minimum for clinical routine use. As regards to bond strength, Transbond XT performed better than the resin cement and the flowable resin. Bond failure occurred within the adhesive in all groups.

A proporção áurea como complemento na determinação da dimensão vertical / The golden proportion as a method for the determination of complementary vertical dimension

O objetivo deste estudo foi avaliar se as medidas faciais utilizadas em métodos tradicionais para determinação da Dimensão Vertical de Oclusão estão em Proporção Áurea (1: 1,618) e, por conseguinte, se podem ser utilizadas como método complementar para determinação desta dimensão. Foram selecionados aleatoriamente pacientes entre 20 e 30 anos, da clínica de Odontologia da Universidade Estadual da Paraíba. A amostra foi composta por 30 indivíduos, sendo 15 do gênero masculino e 15 do gênero feminino. Através da análise de fotografias frontais destes indivíduos, e traçados que trespassam pontos cefalométricos, foi possível elucidar novas abordagens nos tratamentos de reabilitação oral. Em relação ao grau da DTM dos pacientes pesquisados, 63,3% (n = 19) apresentavam algum grau de DTM, sendo que 50% (n = 15) apresentavam DTM leve, 10% (n = 3) apresentavam DTM moderada e apenas 3,3% apresentavam DTM severa. O restante, 36,7% (n = 11), não apresentava sinais ou sintomas de disfunções de ATM. Podemos afirmar, através deste estudo, que em pacientes sem DTM tanto os métodos de mensuração facial como os métodos fisiológicos, como o de Litle modificado por Tamaki, são eficientes na determinação da Dimensão Vertical. Porém, em pacientes com disfunções, os métodos se mostraram imprecisos.

The purpose of this study was to evaluate whether the facial measures used in traditional methods of determination of the Occlusion Vertical Dimension are in Divine Proportion (1:1,618) and, subsequently, whether this Proportion can be used as a complementary method for determination of the dimension. For that, 20 to 30 year-old patients were selected at random from Odontology Clinics of the Paraíba State University. The sample was composed by 30 individuals, 15 of male gender and 15 female gender. Through the analysis of frontal photographs of these individuals, and the designs that trespass cephalometric points, it was possível to elucidate new approches on treatements of oral reabilitation. With regard to the degree of the Temple-mandible Disfunction, 63,3% (n=19) of the patients showed some degree of TMD, of whom 50% (n=15) showed mild TMD, 10% (n = 3) showed moderate TMD and only 3.3% showed severe TMD. The rest, 36.7% (n=11), did not show any signs or symptoms of TMA disfunctions. We can state that in patients without TMD, both the methods of facial measures and physiologic methods, such as Litle's Method modified by Tamaki, are efficient in the determination of the Vertical Dimension. However, in patients with TMD the physiologic methods were imprecise.

Effect of Endodontic Irrigating Solutions on the Micro Push-out Bond Strength of a Fibre Glass Dowel.

PURPOSE: To evaluate the effect of different endodontic irrigating solutions on the micro push-out bond strength of a fiber glass dowel. MATERIAL AND METHODS: Seventy 16-mm long root segments of bovine incisors were prepared and randomly assigned to 7 groups (n=10) according to the type of irrigating solution used prior to the cementation of the intra-radicular fiber glass dowels: G1: 5.25% NaOCl + 17% EDTA; G2: 5.25% NaOCl; G3: 17% EDTA; G4: 2% chlorhexidine gel; G5: 70% alcohol; G6: 11.5% polyacrylic acid; and G7: saline (control). After treatment of intracanal dentin, the glass fibre dowels were cemented with self-adhesive resin cement (RelyX Unicem). Six slices with the thickness of 1.00 ± 0.05 mm were obtained from each tooth at the coronal, middle and apical root thirds (2 slices per third) using a low-speed saw. Micro push-out tests were performed at a crosshead speed of 0.5mm/min and the data (MPa) were analyzed statistically by ANOVA and Tukey's and Dunnett's tests. RESULTS: There were statistically significant differences (p<0.0001) among the irrigating solutions, but no significant difference (p=0.0591) was found among the root thirds. G5 presented the highest bond strength mean of all groups (p<0.0001). The use of 70% alcohol increased the adhesion values by 53% compared to the group control. CONCLUSION: The use of 70% alcohol increased the bond strength of the fiber glass dowel to the dentin walls. However, the push-out bond strength between the dowel and the root dentin was not affected by the root third (coronal, middle and apical).

Efficacy of in-office bleaching techniques combined with the application of a casein phosphopeptide-amorphous calcium phosphate paste at different moments and its influence on enamel surface properties.

OBJECTIVES: The aim of this in vitro study was to investigate the efficacy of in-office bleaching technique combined with the application of a casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) paste (MI Paste-MI) at different moments and its influence on enamel surface properties. METHODS: Eighty bovine dental crowns were randomly allocated into eight groups (n = 10), and bleached with either 35% hydrogen peroxide (HP) or 37% carbamide peroxide (CP). Four different protocols of application of MI were considered: without MI, MI applied before bleaching, MI applied after bleaching, and MI applied both before and after bleaching. Bleaching effectiveness was measured by the VITA EasyShade spectrophotometer utilizing the CIEL*a*b* system (ΔE, ΔL*, Δa*, and Δb*). Color readings were measured at baseline, 7, 14, and 21 days. Hardness and roughness were measured at baseline (T0) and immediately after bleaching (T14). Data were subjected to the two-way ANOVA for repeated measurements and Tukey's test at 5%. RESULTS: HP groups achieved the greatest color change. The application of a CPP-ACP paste did not reduce the efficacy of bleaching peroxides. Samples bleached with CP showed decreased hardness at T14. Samples bleached with HP that received the application of MI before and before/after bleaching did not present hardness decrease at T14. Samples bleached with peroxides only and received MI after bleaching showed increased roughness at T14. CONCLUSIONS: The use of CPP-ACP was able to prevent negative changes in roughness and hardness of bovine enamel when associated to hydrogen peroxide, and might be applied before/after the bleaching protocol.

Enamel properties after tooth bleaching with hydrogen/carbamide peroxides in association with a CPP-ACP paste.

BACKGROUND: This study evaluated the impact of bleaching teeth using blends of a CPP-ACP paste (MI Paste; MI) and carbamide/hydrogen peroxides in different proportions on surface properties of bleached enamel. METHODS: Ninety bovine incisors were bleached with 7.5% hydrogen peroxide (HP), 16% carbamide peroxide (CP), MI and blends of HP or CP:MI at three proportions (1:1, 2:1, 1:2). Hardness and roughness were measured at baseline and after bleaching. Enamel morphology was evaluated by Scanning Electron Microscopy (SEM). The data were analyzed by two-way ANOVA for repeated measurements and Tukey's test. RESULTS: Most of the samples bleached with MI in combination with peroxides presented increased hardness and roughness which were associated to mineral deposition, as observed by SEM images. Blends with higher fractions of MI did not offer superior benefits. CONCLUSIONS: The use of a CPP-ACP paste mixed to carbamide/hydrogen peroxides can decrease adverse side-effects from tooth bleaching on an enamel surface.

Influence of adhesion promoters and curing-light sources on the shear bond strength of orthodontic brackets.

CONTEXT: The effect of different curing units on bond strength of orthodontic brackets is still unclear when utilizing nanofilled composites in comparison with traditional Transbond-XT. AIM: To evaluate the influence of two adhesive promoters and two curing-light units on the shear bond strength (SBS) of orthodontic brackets. SETTINGS AND DESIGN: The factors under study were adhesive promoters (nanofilled composite - Filtek-Z350 flowable restorative and conventional orthodontic adhesive - Transbond XT) and curing-light units (halogen lamp - Ultralux and LED device - Radii-Call). MATERIAL AND METHODS: Forty lower bovine incisors were utilized. The teeth were distributed in four groups (n = 10) according to the combination between adhesive promoters and curing-light units. Scotchbond Multipurpose-Plus and Transbond-XT primer were used to bond Filtek-Z350 Flowable Restorative and Transbond-XT, respectively. After storage in distilled water for 24 h, the brackets were subjected to SBS test at a speed of 0.5 mm/min until bracket debonding. The Adhesive Remnant Index (ARI) was assigned at fractured specimens. STATISTICAL ANALYSIS USED: Analysis of variance and Tukey test were utilized. The Kruskal-Wallis test was used to compare ARI scores between the groups (p<0.05). RESULTS: There was statistically significant difference between the adhesive promoters tested. Transbond-XT showed higher SBS means than Filtek-Z350. There was no statistically significant difference between both curing-light units tested in this study, neither between ARI scores. CONCLUSIONS: The conventional orthodontic adhesive presented higher bond strength than the nanofilled composite, although both materials interacted similarly to the teeth. The curing-light devices tested did not influence on bond strength of orthodontic brackets.

Avaliação da profundidade de cura de dois compositos com diferentes tamanhos de partículas / Evaluate the depth of two composites' cure with different filler particles sizes

Este estudo in vitro teve como objetivo avaliar a profundidade de polimerização de duas resinas compostas com diferentes tamanhos de partículas de carga. Foram selecionadas duas resinas compostas micro-híbridas (Opallis (FGM) e Charisma (Heraeus Kulzer) e uma nanoparticulada Z350 (3M ESPE), todas na cor A3. Corpos de prova nas espessuras de 2, 3 e 4mm foram confeccionados (n=5) por meio do aparelho emissor de luz por diodos LED (Radii SDI). Após 24h de armazenamento dos espécimes em recipientes livre de luz, realizou-se a leitura da dureza Vickers nas superfícies de topo e base. Os dados foram submetidos aos testes estatísticos ANOVA a dois critérios e Tukey (p=0,05). Houve diferenças entre os compósitos, entre as profundidades bem como na interação de ambos os fatores, de forma que, de modo mais frequente, a resina Z350 mostrou valores superiores aos outros materiais. O material nanoparticulado mostrou maior profundidade de polimerização do que as resinas microhíbridas.

This in vitro study aimed to evaluate the depth of two composites' cure with different filler particles sizes. Two micro-hybrid composites (Opallis FGM) and Charisma (Heraeus Kulzer)] and a nanofiller one Z350 (3M ESPE) were selected with A3 shade. Specimens with thicknesses of 2, 3 and 4 mm were made (n = 5) using the light emitting diode LED device (Radii SDI). After 24 h storage of specimens in containers free of light, hardness readings on the top and bottom surfaces were executed. Data were subjected to two-way ANOVA and Tukey tests (p = 0.05). There were differences between the composites, among the depths, as well as in the interaction of both factors. Z350 composite resin showed higher values than other materials in the most experimental conditions. The nanofiller material showed higher polymerization depth than those microhybrid ones.

Update on nonsurgical, ultraconservative approaches to treat effectively non-cavitated caries lesions in permanent teeth.

Dental caries on tooth surfaces is still a problem in many industrialized countries. For many years, dentistry was influenced by a mechanical approach characterized by the use of high-speed rotary cutting instruments, and dentists predominantly used surgical methods to address caries. This included radical removal of diseased portions of the tooth, along with material-driven geometric extensions to areas that were assumed to be caries-resistant. This concept of extension for prevention was introduced by G. V. Black and influenced dentists for more than 120 years. Recently, a new paradigm of operative conservatism, sometimes referred to as "minimally invasive dentistry," has gained popularity. This paradigm is designed to promote maximum preservation of healthy dental structures over a lifetime. The aim of this review is to discuss the efficacy of current nonsurgical treatments for non-cavitated caries lesions in permanent teeth. Based on results obtained from clinical trials, this review evaluates treatments such as consumption of CPP-ACP added gums, resin infiltration and fissure sealing. Although in a few cases an invasive approach is needed to arrest caries progression, the non-surgical approach generally provides potential benefits that include conserving structure by delaying intervention or minimizing the operative procedure. All current non-invasive methods are effective in treating non-cavitated caries lesions. The adoption of non-invasive approaches in the management of these lesions can preserve dental tissues, thus increasing tooth longevity.

Preliminary clinical reports of a novel night-guard tooth bleaching technique modified by casein phosphopeptide-amorphous calcium phosphate (CCP-ACP).

Although supervised night-guard bleaching has proved successful for whitening teeth, both mineral loss and tooth sensitivity are still common problems. The present study introduces a novel remineralizer as well as describes the utilization of a possibly low sensitivity supervised night-guard vital tooth bleaching technique. A 22% carbamide peroxide gel was mixed with the casein phosphopeptide-amorphous calcium phosphate-containing MI Paste. The peroxide/MI Paste mixture was prepared with 1 ml of each material until obtaining a homogeneous paste. Five patients were instructed to follow a home bleaching protocol for 3 weeks. The outcome was assessed visually with a Vitapan scale. All subjects presented reduction of at least two Vitapan scale units after bleaching and no sensitivity was reported. The concomitant use of MI Paste and peroxide might not affect the gel effectiveness and still reduce hypersensitivity levels.

Influence of light-curing units and restorative materials on the micro hardness of resin cements.

AIM: The aim of this study was to evaluate the effect of indirect restorative materials (IRMs) and light-curing units (LCUs) on the micro hardness of dual-cured resin cement. MATERIALS AND METHODS: A total of 36 cylindrical samples (2 mm thick) were prepared with dual-cured resin cement (Relyx ARC) photo-activated with either a QTH (Optilight Plus) for 40s or a LED (Radii) light-curing unit for 65s. Photo-activation was performed through the 2-mm- thick IRMs and the samples were divided into six groups (n=6) according to the combination of veneering materials (without, ceramic and indirect resin) and LCUs (QTH and LED). In the control group, the samples were light-cured with a QTH unit without the interposition of any restorative material. Vickers micro hardness test was performed on the top and bottom surfaces of each sample (load of 50 g for 15 secs). The data were statistically analyzed using a three-way ANOVA followed by Tukey x s post-hoc test ( P < 0.05). RESULTS: There were no statistically significant differences on the top surface between the light curing-units ( P > 0.05); however, the LED provided greater hardness on the bottom surface when a ceramic material was used ( P < 0.05). The mean hardness in photo-activated samples, in which there was no interposition of indirect materials, was significantly greater ( P < 0.01). CONCLUSIONS: It may be concluded that the interposition of the restorative material decreased the micro hardness in the deeper cement layer. Such decrease, however, was lower when the ceramic was interposed and the cement light-cured with LED.

Avaliação dos enxertos homógenos como substitutos aos enxertos autógenos na fixação de implantes osteointegrados: uma revisão sistemática da literatura / Homogeneous grafts as alternative to autogeneous grafts in the treatment with osteointegrated implants: a systematic review of the literature

A falta de estrutura óssea influência diretamente no resultado protético, quando se utiliza implantes ósseointegrados. Os enxertos ósseos para reconstrução total de maxilas atróficas anterior aos implantes, tornam-se, muitas vezes, um procedimento indispensável. O osso ilíaco é uma área doadora muito utilizada para enxertos ósseos. Avaliou-se clinicamente 12 pacientes com atrofias totais de maxila, que foram submetidos a enxertos retirados da crista ilíaca. Encontrou-se uma melhora do perfil externo, bem como no posicionamento labial dos pacientes após o enxerto ósseo. Em todos os casos houve aumento do rebordo alveolar. Concluiu-se também, que é possível utilizar enxertos ósseos da crista do ilíaco para reconstruções de maxila atróficas, para instalação de implantes ósseointegrados.

The lack of bone structure direct influences prosthethic results, when there is a need for the use of osseointegrated implants. The bone graft for the reconstruction of atrophic total maxillae before the implants has become, in many cases. Was analyzed 12 patients with total maxillae atrophy who where undergone to bone graft surgery from the iliac crest. Was found an improvement of the external profile, as well as, in the patients in the patients lip positioning after bone graft. In all cases there was an increase of bone in alveolar crest. Also in conclusion, it is possible the use iliac bone graft to reconstructed atrophic total maxillae in order to perform osseointegrated implants.

Manchamento dentário por tetraciclina grau IV: o que o clínico pode fazer? / Dental darkening by tetracycline rank IV: what can the surgeon dentist do?

O presente trabalho mostra um caso clínico de um paciente especial com grande insatisfação quanto ao escurecimento dos seus dentes, manchados por tetraciclina. O tratamento inicialmenteproposto foi o uso do clareamento caseiro com peróxido de carbamida a 10% (Review 10%), para obter um clareamento, mesmo sabendo que o grau IV da tetraciclina é quase sempre impossível de ser revertido apenas com esta técnica. Assim, ao término de um mês, houve um clareamento considerável nos elementos superiores anteriores, onde o clareamento foi realizado. Porém, optou-se juntamente com o paciente, pelo uso de facetas diretas de resina composta para uma estética ainda mais satisfatória. O objetivo do tratamento foi devolver um sorriso mais agradável e estético, dentro das limitações que o paciente apresentava que era seu grande escurecimento dentário e preservando o máximo de estrutura dental sadia.

Técnicas e cuidados para o sucesso do clareamento endógeno: relato de caso clínico / Technique and precaution for the success of the endogenous bleaching: description of a clinical case

O clareamento dental tem um importante papel na Odontologia Cosmética, possibilitando o restabelecimento da cor e da estética. O clareamento de dentes não vitais é uma modalidade conservadora de tratamento estético para dentes escurecidos, tratados endodonticamente. Entretanto, saber quais dentes podem e devem ser clareados, qual agente clareador mais indicado e a possibilidade de causar danos à estrutura dental e tecidos circunvizinhos, levam o cirurgião-dentista a ter critérios na escolha do procedimento, procurando seguir as indicações, contra-indicações e limitações específicas de cada técnica, visando uma condição segura e previsível do tratamento. Assim, o presente artigo visa apresentar através de uma revisão de literatura e de um caso clínico, a técnica mediata de clareamento endógeno, associados aos prováveis riscos decorrentes do emprego incorreto das técnicas.

Novos tipos de fontes fotopolimerizadoras existentes no mercado: conceitos atuais / New kinds of photocuring light activation sources existing in commerce: new concepts

Tendo em vista o grande desenvolvimento dos aparelhos fotopolimerizadores existentes e a sua importância nos procedimentos restauradores, este trabalho tem como objetivo esclarecer o clínico alguns conceitos importantes, enfocando sua evolução e grande importância no sucesso clínico de restaurações de resina composta. Dentro deste contexto são apresentadas as características com relação à intensidade de luz, comprimento de onda e algumas condições que devem ser consideradas quanto ao uso destes aparelhos.

Microdureza de uma resina composta micro-híbrida submetida a diferentes tempos de exposição e aparelhos fotopolimerizadores (AU) / Microhardness of a microhybrid composite resin submitted to different exposition times and lightcuring devices

Introdução - A proposta deste trabalho foi avaliar o desempenho de três aparelhos fotopolimerizadores utilizados com tempos de exposição diferentes sobre a microdureza de um compósito, em diferentes profundidades (1/2/3mm). Material e Método - Foram utilizados os aparelhos Curing Light com 10/40 segundos, o Kreativ com 6/10/40 segundos e o Apollo 95E com 6/10 segundos. Cinco amostras foram confeccionados para cada aparelho, utilizando uma matriz metálica contendo 4 mm de diâmetro e 5 mm de altura. As amostras foram mantidas por 24h a 37 0 C até serem submetidos ao teste de microdureza Vickers. Foram realizadas seis impressões a cada milímetro. Resultados - A partir da análise estatística, usando o teste Kruskal-Wallis (p<0,0001), observou-se que, independente do tempo e aparelho, no 1 0 mm sempre se obteve melhor microdureza. Conclusões - Com 10 segundos, independente da profundidade, o Kreativ e o Apollo foram melhores que o Curing Light. Utilizando-se o teste Mann-Whitney com 6 segundos, os aparelhos Kreativ e Apollo tiveram no 1ºmm o mesmo grau de polimerização, sendo o Apollo significativamente melhor no 2ºmm e 3ºmm (p<0,0001). O mesmo foi observado para o Curing Light e o Kreativ, em relação ao tempo de 40 segundos, tendo o primeiro obtido melhores valores de microdureza no 2ºmm e 3ºmm (p<0,0001). O Curing Light, quando utilizado com 40 segundos, mostrou-se melhor do que os demais aparelhos testados

Introduction - The aim of this study was to evaluate the performance of 3 lightcuring devices used with different exposition times on the microhardness of a composite, Charisma-A3, in different depths (1/2/3mm). Material and Method - The used devices were the Curing Light with exposition time of 10/40 seconds, the Kreativ with exposition time of 6/10/40 seconds and the Apollo 9Ë with exposition time of 6/10 seconds. The light intensity of the devices was determined using a radiometer. Five specimens were confectioned for each device, using a metallic matrix contends 4 mm of diameter and 5 mm of height. After lightcuring, the specimens were kept for 24 hours at 37º C in specific incubator till they were submitted to the Vickers microhardness test. In order to do that, six impressions to each millimeter in a standardized depth of 3 mm were made. Results - From statistic analysis using the Kruskal-Wallis test (p<0,0001), it was observed that independent of time and device in 1ºmm always microhardness was gotten better. Conclusions - In relation to 10 seconds of polymerization, independent of the depth, the Kreativ and the Apollo were better than the Curing Light. Using the Mann-Whitney test, it was observed that with 6 seconds the devices Kreativ and Apollo had the same polymerization degree in 1ºmm, being Apollo significantly better in 2º mm and 3º mm (p<0,0001). The same was observed for the devices Curing Light and Kreativ in relation to the time of 40 seconds, with the first one getting better values of microhardness in 2ºmm and 3ºmm (p<0,0001). Curing Light device when used with exposition time of 40 seconds revealed to be the best

Avaliação da dureza de uma resina composta polimerizada por diferentes fontes de ativação (led e luz halógena) / Microhardness evaluation of a composite using halogen and led light-curing units

Este estudo avaliou in vitro a capacidade de polimerização de 2 aparelhos de luz utilizando o teste de dureza Vickers variando profundidade de polimerização. Para isso, foram utilizados o aparelho Curing Light XL3000/3M (luz halógena) e o Ultraled Dabi Atlante (à base de Led), ambos com tempo de exposição de 40 segundos. A resina composta utilizada foi a Charisma na cor A30. Em face dos resultados obtidos e da metodologia aplicada, foi possível concluir que: com relação aos aparelhos, o aparelho com luz halógena proporcionou melhores valores de dureza do que o aparelho à base de Led. Com relação à profundidade, verificou-se que para o aparelho à base de Led o 1 mm apresentou maior dureza (42,5), ficando o 2 mm (36,0) em uma posição intermediária e o 3 mm (30,0) o menor valor de dureza. Para o aparelho com luz halógena não houve diferença significativa para as profundidades de 1 mm, 2 mm e 3 mm

Amelogênese imperfeita / Imperfect amelogenese

Com o avanço da tecnologia na área odontológica e modernização da humanidade, a estética vem sendo prioridade no cotidiano da população que almeja atendimento especializado. O objetivo deste trabalho é apresentar um caso clínico, cujo tema a ser relatado é distúrbio dental, com envolvimento de esmalte e dentina, denominado como amelogênese imperfeita, utilizando como terapêutica reabilitadora restaurações diretas com resina composta

Reabilitação estética na dentística conseguida através do uso da resina composta direta / Aesthetic rehabilitation in dentistry obtained through the use of direct composite resin

A odontologia estética tem se tornado muito importante nos dias atuais pois valoriza e restabelece a harmonia da beleza de um sorriso que a sociedade tanto busca. Com as inovações técnicas restauradoras tem se conseguido aperfeiçoar o trabalho clínico com o intuito de atingir resultados agradáveis. Aplicando princípios artísticos como proporção áurea, proporção estética, associado ao correto planejamento com modelos de estudo e utilizações de materiais e instrumentais corretos, os autores procuram evidenciar um caso clínico com o objetivo de se alcançar uma estética excelente, utilizando a resina composta direta em uma única sessão

Recuperação estética: conseguida através do uso da resina composta direta / Aesthetic recovery: Obtained through the use of direct composite resin

A Odontologia Estética tem se tornado muito importante nos dias atuais, pois valoriza e restabelece a harmonia da beleza de um sorriso que a sociedade tanto busca. Com as inovações das técnicas restauradoras, tem-se conseguido aperfeiçoar o trabalho clínico com o intuito de atingir resultados agradáveis. Aplicando princípios artísticos como proporção áurea, proporção estética, associados ao correto planejamento com modelos de estudo e utilizações de materiais e instrumentais corretos, os autores procuram evidenciar um caso clínico com o objetivo de se alcançar uma estética excelente, utilizando a resina composta direta em uma única sessão

Avaliação do desempenho de aparelhos fotopolimerizadores utilizando teste de dureza variando tempo de exposição e profundidade de polimerização / Evaluation of the performance of curing devices using the Vickers hardness test varying times of exposition and depths of polymerization

O objetivo deste trabalho foi avaliar o desempenho de aparelhos fotopolimerizadores utilizando teste de dureza Vickers variando tempo de exposição e profundidades de polimerização. Foram utilizados três tipos de aparelhos fotopolimerizadores, um de luz visível (Curing Light XL 3000) e dois à base de LEDs (Ultraled Dabi Atlante e o 3M ESPE Elipar (R) Free Light) e uma única resina composta Charisma(R) (Kulzer) na cor A30. Foram confeccionados cinco corpos-de-prova para todos os aparelhos com tempo de exposição de 40 segundos e com tempo de exposição de 20 segundos apenas para os aparelhos Curing Light XL 3000 e 3M ESPE Elipar (R) Free Light. Todos os corpos-de-prova foram confeccionados em uma matriz metálica cilíndrica contendo uma cavidade com 4 mm de diâmetro e 5 mm de altura, preenchidas com incremento único de resina, e polimerizada com os tempos estabelecidos. As amostras foram então envoltas com papel alumínio e armazenadas por 24 à temperatura de 37º ± 2ºC em um recipiente à prova de luz, e, logo após, submetidas ao teste de dureza. Com o auxílio de uma régua milimetrada e uma lâmina de bisturi nº 15, foi traçada uma linha no sentido do longo eixo do corpo-de-prova, em seguida o mesmo foi dividido a cada milímetro e levado ao aparelho de dureza. O aparelho utilizado foi Shimadzur micro hardness testers (R) (HVM-2 series Shimadzur corporation Kyoto Japan), equipado com diamante Vickers e carga de 300 gramas durante um tempo de 15 segundos, foram realizadas 6 impressões por milímetro três a cada lado, sendo uma central e duas laterais, até uma profundidade de padronizada de 3 mm...