In vitro analysis of the pH stability of dental bleaching gels during in-office procedures

Previous studies have shown that acidic bleaching gels could lead to worse collateral effects during an in-office bleaching procedure, while neutral or basic products leads towards a better experience. Considering this fact, the main purpose of this stud

Can composite packaging and selective enamel etching affect the clinical behavior of bulk-fill composite resin in posterior restorations? 24-month results of a randomized clinical trial

Objectives: This is a double-blind, split-mouth, randomized clinical study that aims to evaluate the influence of bulk-fill composite packaging presented in syringes (BSy) and capsules (BCa), and the effect of selective enamel etching (SEE) on the clinical performance of class I and II bulk-fill resin composite restorations after 24 months. Methodology: A total of 295 class I or class II restorations were performed on 70 patients. One universal adhesive was applied in all restorations. SEE was used in 148 restorations and self-etching mode (SET) in 147 restorations. After the adhesive application, cavities were restored with Filtek Bulk-fill Posterior Restorative in syringes (BSy), Filtek One Bulk-fill in capsules (BCa), or Filtek Supreme Ultra in syringes with the incremental technique (In). All restorations were evaluated using the FDI criteria after one week and after six, 12, and 24 months. Kaplan-Meier survival analysis and Pearson’s Chi-square test were used (α=0.05) for statistical analysis. Results: After 24 months, 62 patients were evaluated and four restorations were lost due to fracture (one for SEEBSy, two for SEEIn, and one for SETIn). No significant differences in the fracture and retention rate were found between groups (p>0.05). SEE showed significantly fewer marginal adaptation defects than SET (p<0.05). BCa and BSy groups showed fewer marginal discrepancies compared to In (p<0.05). Restorations performed with BCa showed less color mismatch than BSy or In (p<0.05). Conclusion: Although all restorations exhibited satisfactory clinical performance after 24 months of clinical service, the clinical behavior of class I and II restorations’ improved when performed with a bulk-fill composite in capsules, mainly when associated with a universal adhesive applied with SEE

Influence of cavity preparation method, high speed turbine and Er:YAG laser, on hybrid layer thickness of different adhesive systems

O objetivo deste estudo foi promover uma comparação entre as espessuras de camadas híbridas formadas entre os sistemas adesivos Scotchbond Multi-Uso Plus, Single Bond 2, Prime & Bond 2.1 e Xeno III, e a superfície dentinária, preparada com dois métodos de preparo cavitário, a ponta diamantada montada em turbina de alta rotação, e o laser de Er:YAG, utilizado com dois parâmetros de energia (200 e 400 mJ) e dois parâmetros de freqüência (4 e 6 Hz). Para a realização deste experimento, foram realizados tratamentos superficiais com os dois métodos descritos em fragmentos de dentina superficial aplainada, retirados de vinte terceiros molares humanos recém-extraídos, seguido de preparo da dentina com os sistemas adesivos. Após a aplicação e fotoativação de uma camada de compósito sobre a dentina preparada, os corpos de prova foram cortados, polidos e preparados para visualização em MEV, meio pelo qual foram realizadas cinco medidas da espessura da camada híbrida formada em cada corpo de prova. Os resultados obtidos foram tratados estatisticamente por ANOVA e teste de Student-Newnan-Keuls, em um nível de significância de 95%, e por Kruskal Wallis e Mann Whitney, também em um nível de significância de 95%, através do programa SPSS for Windows release 5.0. A análise foi realizada levando-se em consideração dois fatores de estudo, a presença ou não de camada híbrida e a espessura da camada híbrida. Em relação ao fator espessura da camada híbrida, quando se avaliou o tipo de preparo realizado, a análise estatística por ANOVA e Student-Newman-Keuls levou a formação de quatro grupos homogêneos, sendo Grupo I (ponta diamantada) > Grupo II (Laser 200 mJ / 4 Hz) = Grupo III (Laser 200 mJ / 6 Hz) > Grupo IV (Laser 400 mJ / 4 Hz) > Grupo V (Laser 400 mJ / 6 Hz). Quando se avaliou o tipo de sistema adesivo utilizado, não se encontrou diferença estatisticamente significante. Em relação ao fator presença de camada híbrida, quando se avaliou o tipo de preparo realizado, a análise estatística por Kruskal Wallis e Mann Whitney levou a formação de três grupos homogêneos (Grupo I _ Grupo II = Grupo III = Grupo IV _ Grupo V). Quando se avaliou o tipo de sistema adesivo utilizado, não se encontrou diferença estatisticamente significante. Quando se realizou o cruzamento tipo de preparo x sistema adesivo, a análise estatística mostrou a formação de sete grupos distintos. Pela análise dos resultados obtidos neste estudo in vitro, foi possível concluir que em dentina preparada com ponta diamantada em alta rotação, os quatro sistemas adesivos testados formaram camadas híbridas de formato regular e presentes de forma constante, com espessura média de 2,90 1,71 m, e em dentina preparada com laser de Er:YAG, os quatro sistemas adesivos testados formaram camadas híbridas de formato irregular e presentes de forma intermitente, com espessura média variando entre 0,41 1,00 m e 2,06 2,49 m. Além disso, concluiu-se que o laser de Er:YAG com os parâmetros testados influencia negativamente a formação da camada híbrida, e que os métodos de preparo cavitário influenciam na espessura da camada híbrida.The objective of this study was to compare the thickness of the hybrid layer formed using Scotchbond Multipurpose Plus, Single Bond 2, Prime & Bond 2.1 and Xeno III on dentine surface, prepared with a diamond bur in a high speed handpiece, or prepared with an Er:YAG laser, used with two parameters of pulse energy (200 and 400 mJ) and two parameters of frequency (4 and 6 Hz). Flat dentine surfaces obtained from twenty third molars human teeth were treated with the two methods, and then were prepared with the dentine adhesive systems, according to manufacturers instructions. After a layer of composite was applied, specimens were sectioned, flattened, polished and prepared for Scanning Electronic Microscopy observation. Five different measurements of hybrid layer thickness were obtained along the bonded surface in each specimen. Results were statistically analyzed using analysis of variance and Student-Newman-Keuls tests (p ≤ 0.05), and using Kruskal Wallis and Mann Whitney tests (p ≤ 0.05). The statistical analysis was made considering two observations parameters, the presence of the hybrid layer, and its thickness. When analyzing the hybrid layer thickness, and comparing the cavity preparation method, four groups were formed, Group I (diamond bur) > Group II (Laser 200 mJ / 4 Hz) = Group III (Laser 200 mJ / 6 Hz) > Group IV (Laser 400 mJ / 4 Hz) > Group V (Laser 400 mJ / 6 Hz). When comparing the dentine adhesive systems, it was not found any statistically significant difference. When analyzing the presence of hybrid layer, and comparing the cavity preparation method, three groups were formed (Group I ≠ Group II = Group III = Group IV ≠ Group V). When comparing the dentine adhesive systems, it was not found any statistically significant difference. When analyzing the hybrid layer thickness, and comparing the cavity preparation method x the dentine adhesive systems, it was found seven different groups. These results showed that the four tested dentine adhesive systems produce a 2.90 1.71 μm hybrid layer in dentine prepared with diamond bur. This hybrid layer was regular and constantly found. In the laser groups, the dentine adhesive systems produced hybrid layers ranging from 0.41 1.00 μm to 2.06 2.49 μm, which were very irregular and were not found constantly. It was also concluded that Er:YAG laser with the parameters used in this experiment, is a negative influence to the hybrid layer formation, and that cavity preparation methods do influence the hybrid layer formation

Remodelação estética/funcional com resina composta

Objetivo: relatar o caso de um paciente com diastemas e mordida aberta anterior, demonstrando a utilização da resina composta para remodelar a estética e devolver a função, conservando a estrutura dentária. Relato de Caso: nossa proposta foi realizar o fechamento dos diastemas entre os dentes anterossuperiores e mordida aberta anterior, com restaurações de resina composta de canino à canino, dando a estes uma nova forma, no intuito de melhorar a estética do sorriso. Os diastemas dentários são corriqueiros nas clínicas odontológicas e, muitas vezes, representam um problema estético para os pacientes e um desafio para os profissionais. Não apenas a estética deve ser considerada, mas também, a conservação de estrutura dentária, tempo e custo. O fechamento de diastemas em resina composta é cada vez mais utilizado na prática clínica, por ser um dos tratamentos mais conservadores para casos em que se faz necessária a correção da forma, cor ou posicionamento das estruturas dentárias anteriores. Devido às melhorias das propriedades mecânicas e físicas das resinas compostas modernas e dos avanços alcançados na área dos adesivos, atualmente é possível usar esses materiais para realizar restaurações funcionais e estéticas, de maneira que apresentem longevidade satisfatória e ainda proporcionem um alto grau de satisfação pelos pacientes. Conclusão: observou-se o aspecto final e a satisfação relatada pelo paciente e concluiu-se que a utilização de resinas compostas pode facilitar a técnica nos casos de fechamento de diastemas e mordida aberta anterior, permitindo naturalidade, além de ser um tratamento conservador e com excelente resultado estético

Periodontal Plastic Microsurgery in the Treatment of Deep Gingival Recession after Orthodontic Movement

Gingival recession is a condition that affects a large portion of the young and adult population and negatively affects the aesthetic aspects of the smile. Many factors are related to its development, including orthodontic movement beyond the osseous limits. Many treatment options have been proposed to cover the exposed root surface. The aim of this article was to describe three cases where a subepithelial connective tissue graft was performed, using a microsurgical technique, in the treatment of deep gingival recession after orthodontic treatment. This technique resulted in successful root coverage and keratinized tissue gain, improving the gingival esthetic pattern

Mechanical properties of alkasite restorative dental material - A Scoping Review

This scoping review focuses on analyzing the mechanical properties of alkasite restorative dental material, presenting a comprehensive description and analysis of published manuscripts on this subject

Changes in surface roughness and color stability of two composites caused by different bleaching agents

Made available in DSpace on 2019-09-12T16:25:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2012O objetivo deste estudo foi avaliar o efeito de dois agentes clareadores (peróxido de hidrogênio a 10% e 35%) sobre a estabilidade de cor e rugosidade superficial de dois compósitos, um nanohíbrido e um nanoparticulado. Os espécimes foram polidos, envelhecidos, manchados, clareados e polidos novamente. A ação dos agentes clareadores sobre os compósitos foi analisada em perfilômetro (rugosidade) e um espectrofotômetro (estabilidade de cor). A ação de polimento dos compósitos sobre a rugosidade superficial e a retomada da cor dos compósitos também foi avaliada. Os resultados foram analisados estatisticamente por ANOVA e teste de Tukey (5% de significância). A análise indicou que o compósito nanohíbrido foi mais afetado pelo manchamento. Os agentes clareadores não foram capazes de promover o clareamento dos compósitos ao longo do período de avaliação. O polimento da superfície retornou o compósito nanohíbrido à sua condição de cor original, o que não foi observado para o nanoparticulado. Além disso, o polimento não retornou a rugosidade de superfície dos compósitos para os valores originais. Os autores concluíram que o polimento da superfície após o clareamento não deve ser a opção de tratamento, uma vez que não foi possível inverter a rugosidade dos compósitos à sua rugosidade original, sugerindo que uma degradação mais extensa e irreversível pode ter ocorridoThe objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.[Barceleiro, Marcos de Oliveira] Universidade Federal Fluminense, BrazilReis, Rodrigo Sant'anna Aguiar dos] Universidade do Grande Rio, BrazilMendes, Anna Paula Kalix França; Dias, Kátia Regina Hostílio Cervantes] Universidade do Estado do Rio de Janeiro, BrazilBonato, Lucilei Lopes] Universidade de Taubaté, Brazi

Six-month Follow-up of Cervical Composite Restorations Placed With a New Universal Adhesive System: A Randomized Clinical Trial

Purpose: The objective of this double-blind, randomized clinical trial was to evaluate the six-month clinical performance of a new universal adhesive (Xeno Select, Dentsply) in non-carious cervical lesions (NCCLs) using two evaluation criteria: World Dental Federation (FDI) and the US Public Health Service (USPHS). Methods and Materials: A total of 124 restorations were randomly placed in 31 patients according to the following groups: ER-D = etch-and-rinse/dry dentin; ER-M = etch-and-rinse/moist dentin; SE-et = selective enamel etching; and SET = self-etch. The composite resin EVOLUX ( Dentsply) was placed incrementally. The restorations were evaluated after one week (baseline) and at six months using the FDI and USPHS criteria. Statistical analyses were performed using appropriate tests (alpha = 0.05). Results: Fifteen restorations were lost or fractured at six months (one for ER-D, three for ER-M, five for SE-et, and six for SET) (p > 0.05 at six-month recall). When ER (ER-D and ER-M) was compared with SE (SE- et and SET) there was a significant difference in the retention rate after six months (p = 0.001). Marginal staining and postoperative sensitivity to air were only observed in three (one for ER-M and two for SET) and two restorations (two for ER-D) in both evaluation criteria (p > 0.05), respectively. Forty-seven restorations were considered to have minor discrepancies in marginal adaptation at the six-month recall using the FDI criteria (13 for ER-D, 10 for ER-M, 11 for SE-et, and 13 for SET; p > 0.05 between groups). However, for all groups, a significant difference was detected when baseline and six-month data were compared (p < 0.05). Conclusions: The six-month clinical behavior of Xeno Select Universal Adhesive depends on the bonding strategy used. The universal adhesive did not fulfill the American Dental Association criteria for full approval when used in the self-etch mode.This study was partially supported by the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) under grants 304104/2013-9 and 301891/2010-9

A New Universal Simplified Adhesive: 6-Month Randomized multi-center clinical trial

The objective of this multi-centric, double-blind, randomized clinical trial was to evaluate the clinical performance of a new universal adhesive system (Futurabond U, Voco GbmH, Germany) when applied with different application strategies over a period of six months. For this, 200 restorations were performed on non-carious cervical lesions using the adhesive Futurabond U in the four adhesive strategies (n=50 per group): self-etch without previous conditioner (SEE); self-etch associated with selective enamel etching (SET); etch-and-rinse with dry dentin (ERDry) and; etch-and-rinse with wet dentin (ERWet). After the use of the adhesive system, the cavities were restored with Admira Fusion composite resin (Voco GmbH). After 6 months of clinical performance, these restorations were evaluated according to FDI criteria in the following items: retention/fracture, marginal adaptation, marginal staining, postoperative sensitivity and caries recurrence. Seven restorations were lost/fractured after six months of clinical evaluation (2 in the SEE group, 1 in the SET group, 1 in the ERDry group, and 3 in the ERWet group). The retention rates for six months (95% confidence interval) were 96% (86%-98%) for the SEE group, 98% (89%-99%) for the SET group, 98% (89%-99%) for the ERDry group and 94% (83%-97%) for the ERWet group, with no statistical difference identified between any pair of groups (p> 0.05). Twenty-four restorations presented small marginal adaptation defects at the six-months evaluation recall, and all of them were considered clinically acceptable. The clinical performance of the universal adhesive Futurabond U associated to Admira Fusion unidoses resin composite was found to be promise after 6-month of clinical evaluation when applied in noncarious cervical lesions and it was not depending on the bonding strategy employed