Reinforcement of 3D-printed resins for denture base by adding aramid fibers: Effect on mechanical, surface, and optical properties.

PURPOSE: The present study evaluated the mechanical, surface, and optical properties of 3D-printed resins for removable prostheses reinforced by the addition of aramid fibers. MATERIALS AND METHODS: According to ISO 20795-1:2013 standards, specimens were printed using a digital light processing 3D printer and divided into two groups (n = 06/group): 3D-printed resin for denture base as the control group, and a group with the same 3D-printed resin in addition of 5% aramid fibers as the experimental group. Red aramid fibers were chosen for aesthetic characterization. The specimens were evaluated for their mechanical properties, such as elastic modulus (GPa), flexural strength (MPa), and superficial properties by their surface microhardness (KHN), surface roughness (µm), and surface free energy (mJ/m2). Optical properties were evaluated by the color difference (∆E00) between groups. The statistical test chosen after the exploratory analysis of the data was One-way ANOVA followed by Tukey's HSD (α = 0.05). RESULTS: The results showed statistical differences in elastic modulus (p < 0.0001), flexural strength (p < 0.0001), surface free energy polar variable (p = 0.0322), total surface free energy (p = 0.0344), with higher values for the experimental. Surface hardness and surface roughness showed no statistical difference (p ≥ 0.05). The color difference (∆E00) obtained through the CIEDE2000 calculus was below the perceptibility threshold (≤1.1). CONCLUSION: Adding aramid fibers to 3D-printed resin for denture bases resulted in better mechanical properties, without major alterations in surface properties. In addition, it is an easy-to-apply choice for mechanical reinforcement and aesthetic characterization, with the expression of small blood vessels in the 3D-printed resin for removable denture bases.

Can a dentin bonding agent prevent color change in regenerative endodontic procedures? An in vitro evaluation.

This in vitro study aimed to determine the efficacy of dentin bonding agents in preventing color changes following Regenerative Endodontic Procedures. One hundred twenty bovine incisors were endodontically prepared and randomly assigned to a two main factors design: application of a dentin bonding agent (Scotchbond Adper, 3M ESPE, St Paul, MN, USA) in the pulp chamber (Group 1, n=60) versus no bonding intervention (Group 2, n=60), and five levels of intracanal medication (n=12/subgroup): Triple antibiotic paste (TAP), double antibiotic paste (DAB), calcium hydroxide (CH), modified triple antibiotic paste (TAPM), and Control (CTL). Color changes were measured over 28 days at multiple time points (1, 3, 7, 14, 21, and 28 days) using the CIEDE2000 formula to calculate the color difference (ΔE00) from baseline (T0). The ΔE00 quantifies the perceptible color difference between the initial and final tooth color, with lower values indicating less discoloration. The results were analyzed using repeated measures ANOVA-2 and post-hoc Holm-Sidak tests. The TAP subgroups, both with and without the bonding agent, exhibited the highest color variation. However, a pulp chamber seal with a bonding agent showed a protective effect against discoloration compared to no seal, even though complete prevention was not achieved. All groups demonstrated ΔE00 values beyond acceptable interpretation thresholds for clinical application, primarily driven by a reduction in lightness (L*) and a decrease in redness (a* value, shifting towards green). In conclusion, while the pulp chamber seal with a bonding agent mitigated TAP-induced discoloration, it did not eliminate it.

Effect of shade and opacity on color differences and translucency of resin composite veneers over lighter and darker substrates.

To evaluate color differences (ΔE00) and translucency parameters (TP) from mono, bi, and trilayer resin composite veneers using different opacities and shades of resin composite over lighter and darker simulated tooth-colored substrates. Mono, bi, and trilayer veneers (1.5 mm) (n = 12) were made using two shades (A1 and A2) and three opacities (enamel, body, and dentin) of resin composite over simulated lighter (A1) and darker (C4, and C4+) tooth-colored substrates. CIEDE2000 formula was used to calculate ΔE00 considering simulated tooth-colored substrate versus opacities in distinct mono, bi, and trilayer combinations of resin composite over the simulated tooth-colored substrate. The TP was calculated using color coordinates measured over standard white and black backgrounds. Differences in ΔE00 and TP values were calculated with a Three-way Analysis of Variance followed by Tukey's post-hoc test. A1E and A1B monolayer veneers showed similar TP values. Significantly higher ΔE00 values were observed over darker (C4 and C4+), and lower over lighter (A1) simulated tooth-colored substrate. Bilayer and trilayer veneers using dentin opacity provided similar ΔE00 values over the darker tooth-colored substrate. Distinct shades and opacities of resin composite layer combinations over lighter and darker tooth-colored substrates significantly affected TP and ΔE00 values. A1 shade and dentin opacity of monolayer resin composite veneers yielded higher ΔE00 values over darker tooth-colored substrates.

Can a dentin bonding agent prevent color change in regenerative endodontic procedures? An in vitro evaluation

Abstract This in vitro study aimed to determine the efficacy of dentin bonding agents in preventing color changes following Regenerative Endodontic Procedures. One hundred twenty bovine incisors were endodontically prepared and randomly assigned to a two main factors design: application of a dentin bonding agent (Scotchbond Adper, 3M ESPE, St Paul, MN, USA) in the pulp chamber (Group 1, n=60) versus no bonding intervention (Group 2, n=60), and five levels of intracanal medication (n=12/subgroup): Triple antibiotic paste (TAP), double antibiotic paste (DAB), calcium hydroxide (CH), modified triple antibiotic paste (TAPM), and Control (CTL). Color changes were measured over 28 days at multiple time points (1, 3, 7, 14, 21, and 28 days) using the CIEDE2000 formula to calculate the color difference (ΔE00) from baseline (T0). The ΔE00 quantifies the perceptible color difference between the initial and final tooth color, with lower values indicating less discoloration. The results were analyzed using repeated measures ANOVA-2 and post-hoc Holm-Sidak tests. The TAP subgroups, both with and without the bonding agent, exhibited the highest color variation. However, a pulp chamber seal with a bonding agent showed a protective effect against discoloration compared to no seal, even though complete prevention was not achieved. All groups demonstrated ΔE00 values beyond acceptable interpretation thresholds for clinical application, primarily driven by a reduction in lightness (L*) and a decrease in redness (a* value, shifting towards green). In conclusion, while the pulp chamber seal with a bonding agent mitigated TAP-induced discoloration, it did not eliminate it.

Resumo Este estudo in vitro avaliou adesivos dentinários na prevenção de alterações de cor após procedimentos endodônticos regenerativos. Cento e vinte incisivos bovinos foram preparados endodonticamente e aleatoriamente designados para um desenho com dois fatores principais: aplicação de agente adesivo (Scotchbond Adper, 3M ESPE, St Paul, MN, EUA) na câmara pulpar (Grupo 1, n=60) versus não intervenção adesiva (Grupo 2, n=60), e cinco níveis de medicação intracanal (n=12/subgrupo): pasta de triantibiótica (TAP), pasta diantibiótica (DAB), hidróxido de cálcio (CH), pasta triantibiótica modificada (TAPM) e Controle (CTL). Alterações cromáticas foram monitoradas por 28 dias em intervalos (1, 3, 7, 14, 21, e 28 dias), usando CIEDE2000 para calcular a diferença de cor (ΔE00) em relação a cor inicial. O ΔE00 quantifica a diferença entre a cor inicial e final do dente, com valores menores indicando menos descoloração. Os resultados foram analisados usando ANOVA-2 de medidas repetidas e teste posthoc de Holm-Sidak. Os grupos utilizando medicação TAP, com ou sem adesivo, possuíram as maiores variações cromática. Contudo, o uso do adesivo na câmara pulpar mostrou um efeito protetor contra descoloração, em comparação com a ausência do selamento adesivo, embora a prevenção completa não tenha sido alcançada. Todos os grupos demonstraram valores de ΔE00 além dos limiares aceitáveis para aplicação clínica, principalmente devido à redução na luminosidade (L*) e redução no vermelho (a*, deslocando-se em direção ao verde). Em conclusão, enquanto o selamento da câmara pulpar com um agente adesivo mitigou a descoloração induzida pelo TAP, mas não a eliminou completamente.

Effects of disinfection with a vinegar-hydrogen peroxide mixture on the surface characteristics of denture acrylic resins.

OBJECTIVE: This study aimed to investigate changes in the surface characteristics of two denture resins when disinfected with a vinegar-hydrogen peroxide (VHP) mixture. MATERIALS AND METHODS: Microwave-polymerized or 3D printed acrylic resin disks were immersed for 900 min (simulating 90 daily uses) in the following solutions (N = 10): water; 0.5% sodium hypochlorite; hydrogen peroxide and water dilution (1:1 ratio); vinegar and water dilution (1:1 ratio); and VHP mixture. Surface roughness, Knoop microhardness, surface free energy, and scanning electron microscopic images were assessed before and after the immersions. Results were compared using the 2-way ANOVA for repeated measures and Tukey test, at 5% significance. RESULTS: Surface roughness and microhardness did not differ (P > .05) among the solutions and times. Surface free energy and its dispersive component increased (P < .05) for all solutions. All solutions, except for water and VHP mixture, degraded microtopography. CONCLUSIONS: The VHP mixture was not deleterious to conventional and 3D-printed resin surfaces. CLINICAL RELEVANCE: Conventional and 3D printed resin dentures can be disinfected with a VHP mixture in a 1:1 ratio because this mixture does not substantially affect the surface characteristics after 90 daily immersions. On the contrary, sodium hypochlorite, hydrogen peroxide, and vinegar solutions, even in low concentrations, should be used with caution for denture disinfection because they may alter the resin microtopography over time.

O emprego da rede social Instagram com foco na apresentação de Trabalhos de Conclusão de Curso / El uso de la red social Instagram con foco en la presentación de Trabajos de Fin de Curso / Use of the social network Instagram focused on the presentation of Course Completion Monographs

Relata-se a experiência de utilização da plataforma Instagramna criação e disseminação de conhecimento com foco na apresentação de Trabalhos de Conclusão de Curso (TCC) por acadêmicos de graduação em Odontologia. Foi realizado um relato descritivo da veiculação de conteúdo na rede social Instagram, por meio do perfil @powerpoint.tcc. O conteúdo foi produzido por uma acadêmica de graduação em Odontologia, com o apoio de discentes e docentes envolvidos em apresentações científicas e acadêmicas. Foram realizadas postagens frequentes abordando diversas temáticas relacionadas ao tema apresentação de TCC. Foram elaborados materiais variados em formato de posts, destacando-se o uso do softwarePowerPoint para a criação de apresentações; oratória, postura e linguagem; além de informações sobre apresentação de dados de forma atrativa e interessante. Os formatos das postagens realizadas foram aqueles disponíveis na plataforma Instagram: postsno feed, reels, story, vídeos no IGTV, além de livesda própria conta ou em contas parceiras. A periodicidade das postagens temáticas foide pelo menos uma a cada dois dias. A avaliação de alcance e entrega do conteúdo foi obtida por meio das métricas disponibilizadas no próprio aplicativo da rede social. Observou-se grande interesse sobre a temática abordada, uma vez que as apresentações científicas e acadêmicas são habituais para os acadêmicos de graduação. Conclui-se que a experiência prática de utilização da plataforma Instagrampara criação e transmissão de conhecimentos com foco nos TCCs mostrou-se extremamente promissora e propositiva (AU).

Se relata la experiencia del uso de la plataforma Instagram en la creación y difusión de conocimiento, con foco en la presentación de Trabajos de Fin de Curso (TFC) por parte de estudiantes de pregrado en Odontología. Se realizó un relato descriptivo de la colocación de contenidos en la red social Instagram, a través del perfil @powerpoint.tcc. El contenido fue producido por un estudiante de pregrado en Odontología, con el apoyo de estudiantes y profesores involucrados en presentaciones científicas y académicas. Se realizaron publicaciones frecuentes abordando diversos temas relacionados con el tema presentación de TFC. Se prepararon diversos materiales en forma de post, destacándose el uso del software PowerPoint para la creación de presentaciones; oratoria, postura y lenguaje; así como información sobre cómo presentar los datos de forma atractiva e interesante. Los formatos de las publicaciones realizadas fueron los disponibles en la plataforma de Instagram: publicaciones en el feed, reels, story, videos en IGTV, además de live en la propia cuenta o en cuentas de compañeros. La frecuencia de publicaciones temáticas fue de al menos una cada dos días. La evaluación del alcance y entrega del contenido se obtuvo a través de las métricas disponibles en la propia aplicación de la red social. Hubo gran interés en el tema abordado, ya que las presentaciones científicas y académicas son comunes para los estudiantes de pregrado. Se concluye que la experiencia práctica del uso de la plataforma Instagram para la creación y transmisión de conocimiento con enfoque en el TFC demostró ser sumamente promisoria y propositiva (AU).

The experience of using the Instagram platform for creation and dissemination of knowledge is reported, focusing on the presentation of Course Completion Monographs (TCC) by undergraduate dental students. A descriptive report of the diffusion of content on the social network Instagram was performed, on the profile @powerpoint.tcc. The content was produced by an undergraduate dental student, with the support of students and professors involved in scientific and academic presentations. Frequent posts were made addressing several topics related to the presentation of TCC. Several materials were prepared in the form of posts, highlighting the use of PowerPoint software to create presentations; speech, posture and language; as well as information on presenting data in an attractive and interesting manner. The formats of posts were those available on the Instagram platform: feed posts, reels, story, videos on IGTV, besides lives on the account or partner accounts. The frequency of thematic posts was at least one at every two days. The evaluation of content reach and delivery was achieved by the metrics available in the social network application. There was great interest in the topic addressed, since scientific and academic presentations are common for undergraduate students. It was concluded that the practical experience of using the Instagram platform for creating and transmitting knowledge focused on TCCs proved to be extremely promising and purposeful (AU).

A Bibliometric Analysis of Articles Published in Brazilian Dental Journal over 30 years.

This study assessed bibliometric characteristics of all articles published in Brazilian Dental Journal (BDJ) in its 30 years of existence (1990-2019) and factors associated with citation rates. A document search was carried out in Scopus in December, 2019 and information about the articles were exported, including citations. Type of study and main subject in each article were categorized. Number of citations was categorized in tertiles. Logistic regression models were used to assess the association between variables related to articles' characteristics and number of citations. In 30 years, 1705 articles were published and 18507 citations received, with average 57 articles and 334 pages published yearly and 10.9 cites/doc. The most frequent types of study were laboratorial (63%), clinical (18.5%), and case reports (11%); the main subjects were dental materials (21.6%), endodontics (19.3%), and oral pathology/stomatology (13.1%). Most articles had origin in Brazil (90%), followed by USA (4.6%) and UK (1.5%). Aside from BDJ, Journal of Endodontics (3.5%) and International Endodontic Journal (2.2%) were journals that most often cited BDJ. Main origins of citations were Brazil (36.7%), USA (10.6%), and India (9%). Older articles had higher odds to be highly cited (12% increase/year), longer articles had lower odds (9% decrease/page). Narrative reviews and epidemiological studies were associated with more citations and systematic reviews with less citations. In conclusion, BDJ covered many subjects and study types in 30 years, showing increased growth in international audience. The journal may be regarded as one of the leading Brazilian journals in dentistry published in English.

A Bibliometric analysis of articles published in Brazilian Dental Journal over 30 years

Abstract This study assessed bibliometric characteristics of all articles published in Brazilian Dental Journal (BDJ) in its 30 years of existence (1990-2019) and factors associated with citation rates. A document search was carried out in Scopus in December, 2019 and information about the articles were exported, including citations. Type of study and main subject in each article were categorized. Number of citations was categorized in tertiles. Logistic regression models were used to assess the association between variables related to articles' characteristics and number of citations. In 30 years, 1705 articles were published and 18507 citations received, with average 57 articles and 334 pages published yearly and 10.9 cites/doc. The most frequent types of study were laboratorial (63%), clinical (18.5%), and case reports (11%); the main subjects were dental materials (21.6%), endodontics (19.3%), and oral pathology/stomatology (13.1%). Most articles had origin in Brazil (90%), followed by USA (4.6%) and UK (1.5%). Aside from BDJ, Journal of Endodontics (3.5%) and International Endodontic Journal (2.2%) were journals that most often cited BDJ. Main origins of citations were Brazil (36.7%), USA (10.6%), and India (9%). Older articles had higher odds to be highly cited (12% increase/year), longer articles had lower odds (9% decrease/page). Narrative reviews and epidemiological studies were associated with more citations and systematic reviews with less citations. In conclusion, BDJ covered many subjects and study types in 30 years, showing increased growth in international audience. The journal may be regarded as one of the leading Brazilian journals in dentistry published in English.

Resumo Este estudo avaliou as características bibliométricas de todos os artigos publicados no Brazilian Dental Journal (BDJ) em seus 30 anos de existência (1990-2019) e fatores associados com taxas de citação. Uma busca pelos documentos foi realizada no Scopus em Dezembro de 2019 e informações acerca dos artigos foram exportadas, incluindo citações. Tipo de estudo e principal assunto em cada artigo foram categorizados. Número de citações foi categorizado em tercis. Modelos de regressão logística foram usados para avaliar a associação entre as variáveis relacionadas às características dos artigos e o número de citações. Em 30 anos, 1705 artigos foram publicados e 18507 citações recebidas, com média de 57 artigos e 334 páginas publicadas ao ano e 10,9 citações/documento. Os tipos de estudo mais frequentes foram laboratorial (63%), clínico (18,5%) e relato de caso (11%); os principais assuntos foram materiais dentários (21,6%), endodontia (19,3%) e patologia oral/estomatologia (13,1%). A maioria doas artigos teve origem do Brasil (90%), seguido dos EUA (4,6%) e Reino Unido (1,5%). Além do BDJ, Journal of Endodontics (3,5%) e International Endodontic Journal (2,2%) foram os periódicos que mais citaram o BDJ. As principais origem das citações foram Brasil (36,7%), EUA (10,6%) e Índia (9%). Artigos mais antigos tiveram maiores chances de serem altamente citados (aumento de 12% ao ano), artigos mais longos tiveram menores chances (redução de 9% por página). Revisões narrativas e estudos epidemiológicos foram associados com mais citações e revisões sistemáticas com menos citações. Em conclusão, o BDJ cobriu diversos assuntos e tipos de estudo em 30 anos, mostrando contínuo crescimento na audiência internacional. O periódico pode ser considerado um dos líderes entre as revistas brasileiras de odontologia publicadas em inglês.

Avaliação dos egressos do Programa de EducaçãoTutorial (PET) docurso de Odontologia da Universidade Federal de Pelotas / Evaluation of graduates of the Tutorial Education Program (PET) of the Dentistry Course at the Federal University of Pelotas

O objetivo desse trabalho foi avaliar o perfil profissional dos egressos da Faculdade de Odontologia da Universidade Federal de Pelotas,participantes do Programa de Educação Tutorial (PET). Foi realizada uma pesquisa descritiva, de natureza qualitativa e quantitativa, utilizando um questionário eletrônico estruturado eautoaplicável como instrumento de coleta e enviado, via correspondência eletrônica, à todos os egressos que participaram efetivamente do grupo PET e aceitaram participar desta pesquisa. Atividade profissional, níveis de formação e objetivos propostos pelo programa foram avaliados. O total de egressos foi de 89, desde a criação do grupo, em 1992, até o ano de 2019. Com as respostas obtidas (n=59), verificou-se que maior parte dos egressos que aderiram a pesquisa concluíram o curso entre os anos de 2004 até 2018 (59.3%), e apenas 24 (40.6%) em período anterior a 2004. Verificou-se que 25% atuam no serviço público, 44% no setor privado e 22% atuam em ambos. Em relaçãoàtitulação, apenas 4(6,8%)não possuem nenhuma pós-graduação, e 53 (89.8%) atuam na regiãoSul do país, 36 (61%) sãodo sexo feminino e 23 (39%) do masculino. Ao final do questionário, foi perguntado arespeito da influência da participação no Programasobre a trajetória profissional, com uma escala de intensidade progressiva de 1 a 5, gerando 19 respostas com nível 4 e 39respostas com nível 5. Os resultados evidenciaram uma influência muito positiva da participação no Programa na vida profissional de seus ex-participantes, tanto no mercado de trabalho, quanto na vivência de pós-graduação (AU).

This study evaluated the professional profile of graduates of the School of Dentistry at the Federal University of Pelotas, participants of the Tutorial Education Program (PET). A descriptive research was conducted, of qualitative and quantitative nature, using a structured and self-administered electronic questionnaire as collection instrument, sent by email to all graduates who effectively participated in the PET group and agreed to participate in this study. The study assessed the professional activity, traininglevels and objectives proposed by the program. The total number of graduates was 89, since the group was created in 1992 until 2019. The answers obtained (n=59) revealed that most graduates who joined the survey completed the course between the years 2004to 2018 (59.3%), and only 24 (40.6%) in the period before 2004. It was found that 25% work in public services, 44% in the private sector and 22% work in both. Concerning the degree, only 4 (6.8%) did not attend postgraduation education, and 53 (89.8%) work in the Southern region of the country, 36 (61%) are females and 23 (39%) are males. At completion of the questionnaire, the participants were asked about the influence of participation in the Program on their professional career, with a scale of progressive intensity from 1 to 5, retrieving 19 responses with score 4 and 39 responses with score 5. The results evidenced a positive influence from participation in the Program in the professional lives of former participants, both in the job market and in the postgraduation experience (AU).

Prevalence of risk factors for denture stomatitis in complete denture wearers

Aim: The prevalence of denture stomatitis and the relationship with its risk factors was evaluated via secondary data from 62 complete denture (CD) wearers, between 2015 and 2017. Methods: The data was stored in an Excel database and was analyzed using the statistics software STATA/SE 12.0. A descriptive analysis was performed taking into account a categorization of the clinical variables according to risk factor in 4 domains: CD usage, systemic health, hygiene habits, and usage habits. The association amongst the denture stomatitis and risk factors variables was tested by the Chi-square test and the results were statistically significant at p-values <0.05. Results: The CD wearers participants were composed by a majority of elderly (80.64%) and women (72.78%); with 45.16% having been using the current denture for more than 10 years and another 74.19% related a continuous usage. Diabetes and hypertension were related by 83.87% and 67.74%, respectively, with 87.10% using medication. Although 75.80% reported cleaning their dentures 3 times per day or more, and 59.68% considered their oral hygiene very good, 50% of the complete dentures showed dirtiness and clinical signs of Denture Stomatitis were present in 30.64% of the patients. Despite of the evaluated sample shows many risk factors for the development of the disease, an association between the variables was not observed. Conclusion: Considering the high prevalence of the disease in the studied sample, preventive and educational measures on denture usage and hygiene must be reinforced in order to maintain the oral health of the edentulous patients