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1.
Braz. j. oral sci ; 22: e237216, Jan.-Dec. 2023. ilus
Article in English | LILACS, BBO | ID: biblio-1443556

ABSTRACT

The study investigated the factors associated with the self-perception safety of dental students in clinical activities during the COVID-19 pandemic. This cross-sectional study was based on a semi-structured online (google forms) self-applied questionnaire, sent by e-mail to three private Dental Schools in Brazil. The variables were: 1) sociodemographic information; 2) questions about the measures adopted by dental schools before returning to clinical activities; 3) dental students' self-perception of security; 4) the General Health Questionnaire. Data were submitted to Fisher's exact test (p<0.05). Of the 294 eligible students, 97% were evaluated and 100% received previous specific biosafety training predominantly theoretical (72.16%) longer than one hour (51.55%). Most students (81.44%) felt secure performing clinical care during the COVID-19 pandemic. Students undergoing specific biosafety training for longer than one hour felt safer than those perfoming training for up to 1 hour (p=0.004). Students from schools where the aerosol-producing restriction was applied felt safer than those without restrictions (p=0.016). Women reported feeling less secure than men (p=0.046), and students who submitted to COVID-19 Specific Biosafety Training felt safer in clinical activities than those submitted to theoretical training only (p=0.011). Students from private universities presenting psychosomatic changes felt less secure in practicing clinical dental care activities (p=0.006). In conclusion, time-spent training in biosafety, restriction of the use of aerosol-producing procedures, and the gender of students were associated with the self-perception safety of students. Students with practical training felt safer in clinical activities for patients with COVID-19 than those who had only theoretical training


Subject(s)
Humans , Male , Female , Adolescent , Adult , Self Concept , Students, Dental , Surveys and Questionnaires , Containment of Biohazards , COVID-19
2.
Braz. j. oral sci ; 21: e225368, jan.-dez. 2022.
Article in English | LILACS, BBO | ID: biblio-1384156

ABSTRACT

Aim In Brazil, COVID-19 remains one of the epicenters of the pandemic, thus, presential educational activities are suspended. The study aimed to describe the approach of flipped classroom performed to provide social distancing and to maintain teaching activities during COVID-19-pandemic. Methods Flipped Classroom was chosen to be associated with the role-play technique as a central methodology. To bring students closer to activities performed in the non-pandemic period, some actions and assessments were also role-played by Professor simulating patients in virtual meetings. Results Although the changes in the format of the lessons, our approaches stimulated the students maintained the high frequency of students in the activities (almost 100%) providing continuity activities. Conclusions This report can reinforce that meaningful learning can be taught by using a virtual/remote approach. However, the potential positive results observed cannot be used as an excuse to maintain remote teaching activities with the objective of cost-cutting by the institutions.


Subject(s)
Students, Dental , Teaching , Physical Distancing , COVID-19 , Learning
3.
Braz. j. oral sci ; 20: e210053, jan.-dez. 2021. tab
Article in English | BBO, LILACS | ID: biblio-1253163

ABSTRACT

Aim: The literature has not yet reported investigations about the effect of laser photobiomodulation (LPBM) over the cytotoxicity of drugs for endodontic treatments. Thus, the aim of this study was to evaluate, in vitro, the effect of the association between LPBM and intracanal medications on fibroblasts viability in different exposure times. Methods: Calcium hydroxide (Ca(OH)2) and iodoform (IO) were used pure or associated to LPBM. Eluates of medications were prepared and placed in contact with the cells in three different periods: 24h, 48h and 72h. Laser irradiation (emitting radiation λ 660nm, power density of 10mW, energy density of 3 J/cm²) has been performed in two sessions within a six hour interval, for 12s per well. After each experimental time, the colorimetric assay (MTT) has been performed. Statistical analysis was applied for Mann-Whitney test with 5% α error admitted test. Results: At 24h, the use of LPBM did not increase cell viability while after 72h cell proliferation was stimulated in the group without medications. LPBM application did not increase cell viability in Ca(OH)2 group and IO at any tested time. Ca(OH)2 cytotoxicity at 24h was higher than iodoform, while at 72h not difference was observed. Therefore, after 72 hours was no statistical difference between the IO and Ca(OH)2 groups. Conclusion: LPBM was able to increase cell viability in 72h in the group without medication, although no improvement was observed in the other groups. Thus, LPBM was not able to reduce the cytotoxic effects of the materials on fibroblasts in vitro


Subject(s)
Low-Level Light Therapy , Endodontics , Fibroblasts
4.
Braz. arch. biol. technol ; 64: e21200344, 2021. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1350250

ABSTRACT

Abstract This study developed and characterized a method for controlled deposition of thin films of hydroxyapatite on titanium surfaces. Thirty-three titanium cylinders were randomly divided: negative control/polished (A), acid etched (B) and coated by hydroxyapatite (C). Acid etch was performed in an aqueous solution of nitric acid. The cylinders were subjected to coating by a thin film of hydroxyapatite with dip-coating method. These cylinders were submitted to a pre-heat treatment 450°C/10 minutes and 800°C/2 hours. Scanning electron microscopy analysis demonstrated a homogeneous and smooth surface (A), an irregular and porous surface (B) and a crystalline deposition (C). The X-ray energy dispersive analysis showed characteristic elements of hydroxyapatite (C). Analysis by X-ray diffraction showed the presence of characteristic peaks of hydroxyapatite, corresponding to the structural composition of hydroxyapatite. Cell viability (MTT-assay in NIH-3T3-Cells) test demonstrated no differences between the groups. Titanium surfaces coated with a hydroxyapatite film by the dip-coating method suggest adequate control of deposition of thin films of hydroxyapatite and similar cell viability using mouse fibroblasts.

5.
Cad. saúde colet., (Rio J.) ; 27(3): 345-353, jul.-set. 2019. tab, graf
Article in Portuguese | LILACS-Express | LILACS | ID: biblio-1039442

ABSTRACT

Resumo Introdução A saúde pública no Brasil sofreu grandes mudanças nas últimas décadas. Objetivo Descrever o panorama da produção odontológica realizada pelo SUS de 1999 a 2017 no Brasil e suas macrorregiões. Método Os dados foram obtidos no Sistema de Informação Ambulatorial (SIA-SUS) e do Instituto Brasileiro de Geografia e Estatística (IBGE). Foram criadas taxas de procedimentos (por 100 mil habitantes/ano) realizados em cada macrorregião: procedimentos restauradores, protéticos, coletivos, endodontia, exodontia, periodontia e preventivos de 1999 a 2017. A análise estatística das séries temporais foi realizada utilizando um modelo de regressão linear. Resultados Procedimentos protéticos e de periodontia foram os únicos que apresentaram uma tendência linear positiva em todas as macrorregiões brasileiras (p<0,001). A Endodontia não apresentou tendência positiva no Brasil (p=0,173). Restaurações apresentaram um crescimento na macrorregião Norte (p=0,003) e Centro-Oeste (p<0,001). Exodontias apresentaram na macrorregião Norte uma tendência de aumento (p=0,046) enquanto que, no Centro-Oeste, apresentaram uma diminuição (p=0,049). Procedimentos preventivos (p=0,042) e coletivos (p=0,017) apresentaram uma diminuição da sua produção durante o período. Conclusão A saúde bucal apresentou um grande crescimento dentro do Sistema Único de Saúde nos 19 anos avaliados. Procedimentos de periodontia e de prótese dentária foram aqueles com as maiores tendências de crescimento.


Abstract Background Public health in Brazil has undergone major changes in recent decades. Objective To describe the overview of dental production performed by the Brazilian Unified Health System from 1999 to 2017 in Brazil and its macroregions. Method Data were obtained from the Outpatient Information System (SIA/SUS) and from the Brazilian Institute of Geography and Statistics (IBGE). Procedures rates (per 100,000 inhabitants per year) were established in each macroregion: restorative, prosthetic, collective, endodontic, exodontia, periodontic and preventive procedures. Statistical analysis of the time series was performed using a regression linear model. Results Prosthetic and periodontal procedures were the only ones with a positive linear trend in all Brazilian macroregions (p<0.001). Endodontics did not show a positive trend in Brazil (p=0.173). Restorations showed a growth in the North (p=0.003) and Center-west (p<0.001) macroregions. Exodontia presented a tendency to increase in the North macroregion (p=0.046), while the Midwest presented a decrease of it (p=0.049). Preventive (p=0.042) and collective (p=0.017) procedures showed a decrease in their production during the period. Conclusion Oral health showed great growth within the single health system in the 19 years evaluated. Periodontal procedures and dental prostheses were those with the highest growth trends.

6.
Braz. dent. j ; 30(2): 77-95, Mar.-Apr. 2019. tab, graf
Article in English | BNUY, BNUY-Odon, LILACS | ID: biblio-1001438

ABSTRACT

Abstract The aim of presented systematic scoping review was to investigate the actual and future clinical possibilities of regenerative therapies and their ability to regenerate bone, periodontal and pulp with histological confirmation of the nature of formed tissue. Electronic search was conducted using a combination between Keywords and MeSH terms in PubMed, Scopus, ISI-Web of Science and Cochrane library databases up to January 2016. Two reviewers conducted independently the papers judgment. Screened studies were read following the predetermined inclusion criteria. The included studies were evaluated in accordance with Arksey and O'Malley's modified framework. From 1349 papers, 168 completed inclusion criteria. Several characterized and uncharacterized cells used in Cell Therapy have provided bone regeneration, demonstrating bone gain in quantity and quality, even as accelerators for bone and periodontal regeneration. Synthetic and natural scaffolds presented good cell maintenance, however polyglycolid-polylactid presented faster resorption and consequently poor bone gain. The Growth Factor-Mediated Therapy was able to regenerate bone and all features of a periodontal tissue in bone defects. Teeth submitted to Revascularization presented an increase of length and width of root canal. However, formed tissues not seem able to deposit dentin, characterizing a repaired tissue. Both PRP and PRF presented benefits when applied in regenerative therapies as natural scaffolds. Therefore, most studies that applied regenerative therapies have provided promising results being possible to regenerate bone and periodontal tissue with histological confirmation. However, pulp regeneration was not reported. These results should be interpreted with caution due to the short follow-up periods.


Resumo O objetivo da presente Scoping review foi investigar as possibilidades clínicas atuais e futuras das terapias regenerativas e sua capacidade de regenerar tecido ósseo, periodontal e polpar em humanos com confirmação histológica da natureza do tecido formado. Uma busca eletrônica foi realizada utilizando uma combinação entre as palavras-chave e termos MeSH nos bancos de dados PubMed, Scopus, ISI-web of Science e Cochrane library até janeiro de 2016. Dois revisores realizaram de forma independente o julgamento dos documentos. Os estudos selecionados foram lidos seguindo os critérios de inclusão predeterminados. Os estudos incluídos foram avaliados de acordo com a estrutura modificada de Arksey e O'Malley. Dos 1349 artigos, 168 preencheram os critérios de inclusão. Várias células caracterizadas e não caracterizadas promoveram regeneração óssea utilizada em terapias celulares, demonstrando ganho ósseo em quantidade e qualidade, de forma rápida para regeneração óssea e periodontal. Os scaffolds sintéticos e naturais apresentaram boa manutenção celular, no entanto o poliglicol-polilácido apresentou uma reabsorção rápida e, consequentemente, pequeno ganho ósseo. A terapia mediada por fatores de crescimento foi capaz de regenerar tecido ósseo e todas as características de um tecido periodontal. Dentes submetidos à revascularização apresentaram aumento do comprimento e largura do canal radicular. No entanto, os tecidos formados não foram capazes de depositar dentina, caracterizando um tecido reparado. Tanto o PRP quanto o PRF parecem apresentar benefícios quando aplicados em terapias regenerativas sendo um bom scaffold natural. Portanto, a maioria dos estudos que aplicaram terapias regenerativas forneceram resultados promissores sendo possível regenerar tecido ósseo e periodontal com confirmação histológica. No entanto, não foi observada regeneração de polpa dental. Estes resultados devem ser interpretados com cautela.


Subject(s)
Root Canal Therapy , Dental Pulp , Bone Regeneration , Periodontium , Dentin
7.
RFO UPF ; 24(3): 417-421, 2019.
Article in Portuguese | LILACS, BBO | ID: biblio-1357687

ABSTRACT

Objetivo: a literatura tem apontado para uma pequena sensibilização e capacitação dos profissionais de saúde ao acolher e atender a população LGBT. O presente estudo objetivou relatar um caso clínico de uma usuária trans e discutir aspectos importantes sobre o atendimento e o acolhimento de transexuais e travestis. Relato de caso: a usuária, nome social de "A", 25 anos de idade, sexo biológico masculino e gênero feminino foi encaminhada da Unidade Básica de Saúde com queixas estéticas e cálculo supra/subgengival. A usuária chegou ao atendimento já apresentando sinais claros de desconforto e reclusão. Ao observar tal estado foi indagado à usuária, no início da entrevista dialogada, se ela teria outro nome em que gostaria de ser identificada. Então, prontamente a paciente identificou seu nome social. A partir daquele momento, J.F.C.P., passou a ser "A" durante todo o atendimento, bem como seu direito lhe assegura. Em seguida, a usuária já demonstrou estar mais confortável e receptiva a conversa da entrevista dialogada, fortalecendo o vínculo com a estudante. Ainda durante a entrevista, a usuária demonstrou ter dúvidas em relação a alguns de seus direitos enquanto mulher trans, como por exemplo, o uso do nome social no cartão do SUS. Considerações Finais: o profissional de saúde tem como principal papel no acolhimento de transexuais e travestis a criação de um vínculo isento de preconceitos. Assim, é dever do profissional atualizar-se em relação a questões de gênero e sexualidade a fim de prevenir situações e propagações de preconceito, discriminação e violência.(AU)


Objective: The literature has indicated a low level of awareness and training of health professionals in welcoming and serving the LGBT population. The present study aimed to report a clinical case of a trans user and discuss important aspects about the care and reception of transsexuals and transvestites. Case report: The user, with a social name of "A", 25 years old, male biological sex and female gender, was referred from the Basic Health Unit with aesthetic complaints and supra/subgingival calculus. The user arrived at the service already presenting clear signs of discomfort and seclusion. Considering such a state, the user was asked at the beginning of the dialog interview whether she had another name in which she would like to be identified. Then, the patient promptly identified her social name. From that moment, J.F.C.P. became "A" throughout the service, as assured by her rights. After this, the user was already more comfortable and receptive to the conversation in the interview, strengthening the bond with the student. During the interview, the user also expressed doubts about some of her rights as a trans woman, such as the use of the social name on her public health system card. Final considerations: The main role of health professionals in the reception of transsexuals and transvestites is to create a bond free of prejudices. Thus, professionals have a duty to be updated on issues of gender and sexuality to prevent situations and propagations of prejudice, discrimination, and violence.(AU)


Subject(s)
Humans , Male , Female , Adult , Dental Care/psychology , Dentist-Patient Relations , User Embracement , Transgender Persons/psychology , Sexism , Gender Identity
8.
RFO UPF ; 23(2): 161-167, 24/10/2018. tab
Article in Portuguese | LILACS, BBO | ID: biblio-947644

ABSTRACT

Centros de especialidades odontológicos (CEOs) são estabelecimentos de saúde de âmbito especializado que devem realizar uma quantidade mínima de procedimentos. Objetivos: descrever a produção odontológica especializada e reportar o cumprimento das metas nas capitais brasileiras com CEOs. Materiais e método: foi conduzido um estudo do tipo longitudinal retrospectivo, sendo realizada uma busca por CEOs cadastrados no Cadastro Nacional de Estabelecimentos de Saúde (CNES). A produção odontológica foi pesquisada no Sistema de Informações Ambulatoriais do Sistema Único de Saúde (SIASUS), de maio de 2015 a abril de 2016. Resultados: foram encontrados e considerados elegíveis para o presente estudo 59 CEOs, localizados em 19 capitais brasileiras e no Distrito Federal, sendo 48% CEOs tipo II. Cerca de 730 mil procedimentos especializados foram realizados durante os 12 meses avaliados. Uma taxa de 86% das metas foi cumprida, sendo que cirurgia foi à área com maior cumprimento (92%), seguida de periodontia (89%) e endodontia (76%). Uma das capitais apresentou apenas 33% das metas cumpridas. Três capitais não atingiram nenhuma das metas estabelecidas em procedimentos de endodontia. Conclusão: foi observada uma grande variação no cumprimento das metas entre as capitais com CEOs. Enquanto algumas capitais apresentaram elevado cumprimento das metas, outras exibiram dados preocupantes, principalmente nos procedimentos de endodontia. (AU)


Dental Specialty Centers (Centros de Especialidades Odontológicas ­ CEOs) are specialized health facilities that should perform a minimum number of procedures. Objectives: this study aimed to describe the specialized dental production and report the achievement of goals in Brazilian capitals with CEOs. Materials and method: a retrospective longitudinal study was performed with a search for the CEOs listed in the National Registry of Health Establishments. The dental production was searched in the Outpatient Information System of the Brazilian Unified Health System for the period from May 2015 to April 2016. Results: fifty-nine CEOs were found and considered eligible for the present study. They were located in 19 Brazilian capitals and in the Federal District, whereas 48% were CEOs Type II. Approximately 730 thousand specialized procedures were performed during the 12 months evaluated. A rate of 86% of goals was met and surgery presented the highest achievement (92%), followed by periodontics (89%) and endodontics (76%). One of the capitals achieved only 33% of the goals. Three capitals did not achieve any of the goals set for endodontic procedures. Conclusion: there was a great variation in the achievement of goals among capitals with CEOs. While some capitals showed high achievement of goals, others presented concerning data, especially for endodontic procedures. (AU)


Subject(s)
Humans , Specialties, Dental/statistics & numerical data , Unified Health System , Dental Facilities/statistics & numerical data , Outpatients/statistics & numerical data , National Health Strategies , Brazil , Retrospective Studies , Longitudinal Studies , Oral Surgical Procedures/statistics & numerical data
9.
RGO (Porto Alegre) ; 65(4): 359-367, Oct.-Dec. 2017. graf
Article in English | LILACS, BBO | ID: biblio-896042

ABSTRACT

ABSTRACT Regenerative therapies have been widely developed in dentistry and it is important to incorporate dentists' knowledge of these new therapies into the dental clinic routine. This study reviewed the literature on regenerative therapies and clinical applications. Tissue engineering has contributed to changes in the paradigm of restorative health sciences. Its pillars underpin the techniques of tissue and organ regeneration. Despite the majority of studies in this field being in vitro, a range of preclinical studies and methodologies has been formed using these principles and they are already being used on humans. The use of platelet-rich plasma and platelet-rich fibrin in surgery as natural scaffolds for the reestablishment of bone and periodontal tissue are often reported in the literature and clinical trials using this approach have shown promising results. Stem cells from autologous dental pulp have been successfully applied in bone tissue regeneration using natural collagen scaffold in humans. In addition, revascularization of the root canal already appears in the literature as a promising alternative to apexification. The principle behind this therapy is the use of the blood clot as a scaffold and the migration of stem cells of the apical papilla to regenerate the dental pulp organ. Final considerations: Although still in the early stages, regenerative therapies can now be used in dental practice. Knowledge of the principles governing these therapies should be understood by the dentist for use in clinical practice.


RESUMO Terapias regenerativas vem sendo amplamente desenvolvidas na odontologia e o conhecimento destas novas terapias por parte dos dentistas é importante para que elas sejam incorporadas na rotina clínica odontológica. Assim, este estudo revisou a literatura acerca das terapias regenerativas e suas aplicações clínicas. A engenharia tecidual tem contribuído na mudança do paradigma restaurador das ciências da saúde. Seus pilares embasam as técnicas de regeneração de tecidos e órgãos. Apesar da grande maioria dos estudos neste campo ser in vitro, uma gama de metodologias pré-clínicas foi consolidada e estudos utilizando estes princípios já estão sendo empregados em humanos. A utilização de plasma rico em plaquetas e plasma rico em fibrina como scaffolds naturais em cirurgias para reestabelecimento de tecido ósseo e periodontal são frequentemente relatadas na literatura e ensaios clínicos utilizando esta abordagem demonstram resultados promissores. Células-tronco da polpa dental autólogas já foram aplicadas com sucesso na regeneração de tecido ósseo utilizando scaffold naturais de colágeno em humanos. Além disto, a revascularização do canal radicular já aparece na literatura como uma alternativa promissora frente a opção de apecificação do canal radicular. Esta terapia utiliza como princípio o coágulo sanguíneo como scaffold e a migração das células-tronco da papila apical para regenerar o órgão pulpar. Considerações finais: Apesar de incipientes, as terapias regenerativas já podem ser utilizadas na prática clínica odontológica. O conhecimento dos princípios que regem estas terapias deve ser compreendido pelo dentista para que sejam utilizadas na prática clínica.

10.
RFO UPF ; 21(3): 407-413, 15/12/2016.
Article in Portuguese | LILACS | ID: biblio-848650

ABSTRACT

O presente estudo revisou a literatura científica em busca das perspectivas e dos principais desafios enfrentados pelas terapias de regeneração do disco articular. Revisão de literatura: a disfunção temporomandibular (DTM) é uma desordem de etiologia multifatorial em que patologias, deformidades e mau posicionamento do disco da articulação temporomandibular (ATM) estão presentes em até 70% dos casos diagnosticados. Dessa forma, o emprego de conhecimentos e princí- pios da engenharia tecidual para o desenvolvimento de terapias que busquem a regeneração do disco articular pode ser uma opção de tratamento futuro. Células- -tronco mesenquimais (MSC) são frequentemente empregadas, apresentando a capacidade de se diferenciar em condrócitos e depositar tecido semelhante ao da ATM. Estudos têm apontado que essas células podem apresentar melhor regeneração que células removidas da própria ATM lesionada, que apresentam uma menor deposição de matriz extracelular. Abordagens para reconstrução têm empregado, principalmente, scaffolds sintéticos, como polímeros e hidrogéis, assim como scaffolds naturais de origem colágena. Esses materiais têm possibilitado a proliferação celular e a deposição de matriz extracelular. Técnicas de descelularização com diversos solventes orgânicos têm apresentado a capacidade de não desenvolver resposta imune, sendo possível sua utilização. A utilização de fatores de crescimento parece contribuir significativamente na sinalização e diferenciação celular, incrementando a deposição de tecido cartilaginoso. Considerações finais: apesar de a regeneração tecidual do disco articular se apresentar como uma provável opção de tratamento para os diversos tipos de DTM, a literatura ainda se encontra em fase inicial de investigação, com estudos predominantemente in vitro e in vivo.

11.
Braz. dent. j ; 27(6): 633-640, Nov.-Dec. 2016. tab, graf
Article in English | LILACS, BNUY, BNUY-Odon, BIBSMU | ID: biblio-828053

ABSTRACT

Abstract This systematic review evaluated if different cryopreservation protocols could affect biological properties (Cell survival rate (CSR), proliferation, differentiation, maintenance of stem cell markers) of stem cells obtained from dental tissues (DSC) post-thaw. An electronic search was carried out within PubMed and ISI Web Science by using specific keyword. Two independent reviewers read the titles and abstracts of all reports respecting predetermined inclusion/exclusion criteria. Data were extracted considering the biological properties of previously cryopreserved DSCs and previously cryopreserved dental tissues. DSCs cryopreserved as soon as possible after their isolation presents a CSR quite similar to the non-cryopreserved DSC. Dimethyl sulfoxide (DMSO) [10%] showed good results related to cell recovery post-thaw to cryopreserve cells and tissues for periods of up to 2 years. The cryopreservation of DSC in a mechanical freezer (-80°C) allows the recovery of stem cells post-thaw. The facilities producing magnetic field (MF), demand a lower concentration of cryoprotectant, but their use is not dispensable. It is possible to isolate and cryopreserve dental pulp stem cell (DPSC) from healthy and diseased vital teeth. Cryopreservation of dental tissues for late DSC isolation, combined with MF dispensability, could be valuable to reduce costs and improve the logistics to develop teeth banks.


Resumo Essa revisão sistemática avaliou se diferentes protocolos de criopreservação podem afetar as propriedades biológicas (taxa de sobrevivência celular, proliferação, diferenciação, manutenção dos marcadores de superfície) de células-tronco isoladas de tecidos dentais (DSC) após o descongelamento. Uma busca eletrônica foi realizada no PubMed e no ISI Web of Science utilizando palavras-chave específicas. Dois revisores independentes avaliaram os títulos e resumos de todos os estudos respeitando critérios de inclusão e exclusão previamente determinados. Os dados foram extraídos considerando as propriedades biológicas de DSC, e DSC isoladas de tecidos previamente criopreservados. DSC criopreservadas logo após seu isolamento apresentaram propriedades biológicas muito semelhantes às observadas em DSC não criopreservadas. Dimetil sulfóxido (DMSO) [10%] demonstrou bons resultados relacionados com a recuperação celular após descongelamento de células e tecidos, por períodos de até 2 anos. A criopreservação de DSC em freezer mecânico (-80 °C) permite a recuperação de células-tronco pós-descongelação. A utilização de freezer com campo magnético (MF), proporciona a utilização de uma menor concentração de crioprotector, mas a sua utilização não é dispensável. É possível isolar e criopreservar e criopreservar células-tronco da polpa dental (DPSC) de dentes vitais saudáveis e doentes. Criopreservação de tecidos dentais após o isolamento de DSC, combinados com MF, podem ser valiosas estratégias para reduzir custos e melhorar a logística no desenvolvimento de bancos de dentes.


Subject(s)
Humans , Tooth/cytology , Cryopreservation , Mesenchymal Stem Cells/cytology , Cell Survival
12.
Braz. oral res. (Online) ; 30(1): e93, 2016. graf
Article in English | LILACS | ID: biblio-952019

ABSTRACT

Abstract The aim of the present study was to evaluate the expression of transforming growth factor-β1 (TGF-β1) and osteonectin (ON) in pulp-like tissues developed by tissue engineering and to compare it with the expression of these proteins in pulps treated with Ca(OH)2 therapy. Tooth slices were obtained from non-carious human third molars under sterile procedures. The residual periodontal and pulp soft tissues were removed. Empty pulp spaces of the tooth slice were filled with sodium chloride particles (250-425 µm). PLLA solubilized in 5% chloroform was applied over the salt particles. The tooth slice/scaffold (TS/S) set was stored overnight and then rinsed thoroughly to wash out the salt. Scaffolds were previously sterilized with ethanol (100-70°) and washed with phosphate-buffered saline (PBS). TS/S was treated with 10% EDTA and seeded with dental pulp stem cells (DPSC). Then, TS/S was implanted into the dorsum of immunodeficient mice for 28 days. Human third molars previously treated with Ca(OH)2 for 90 days were also evaluated. Samples were prepared and submitted to histological and immunohistochemical (with anti-TGF-β1, 1:100 and anti-ON, 1:350) analyses. After 28 days, TS/S showed morphological characteristics similar to those observed in dental pulp treated with Ca(OH)2. Ca(OH)2-treated pulps showed the usual repaired pulp characteristics. In TS/S, newly formed tissues and pre-dentin was colored, which elucidated the expression of TGF-β1 and ON. Immunohistochemistry staining of Ca(OH)2-treated pulps showed the same expression patterns. The extracellular matrix displayed a fibrillar pattern under both conditions. Regenerative events in the pulp seem to follow a similar pattern of TGF-β1 and ON expression as the repair processes.


Subject(s)
Humans , Animals , Mice , Stem Cells/drug effects , Calcium Hydroxide/pharmacology , Osteonectin/analysis , Dental Pulp/drug effects , Transforming Growth Factor beta1/analysis , Time Factors , Calcium Hydroxide/therapeutic use , Immunohistochemistry , Osteonectin/drug effects , Cells, Cultured , Reproducibility of Results , Tissue Engineering/methods , Dental Pulp/cytology , Dentin/drug effects , Guided Tissue Regeneration/methods , Extracellular Matrix/drug effects , Transforming Growth Factor beta1/drug effects , Tissue Scaffolds , Odontoblasts/drug effects
13.
Braz. dent. j ; 26(6): 566-571, Nov.-Dec. 2015. tab
Article in English | LILACS | ID: lil-769567

ABSTRACT

Studies based on dentists' clinical practice possess vital relevance to understand factors leading the clinicians to choose by a specific technique over another. This study investigated which clinical conduct therapies are adopted by dentists in front of deep caries. Was evaluated how the place of work, post-graduate training and years since complete graduation influenced their decisions. A cross-sectional study was performed using a self-applied questionnaire with dentists (n=276) in Southern Brazil. Information regarding post-graduation training (specialization, master's or PhD), clinical experience (years since completing graduation) and place of work were investigated. The information regarding pulp vital therapies (materials for direct pulp capping; techniques for caries removal in deep cavities and strategies for indirect pulp capping) were collected by specific questions. Data were submitted to descriptive analysis and Exact Fischer Test. Response rate was 68% (187). The majority of dentists selected the calcium hydroxide (CH) as first material for direct (86.3%) and indirect (80.3%) pulp protection. Partial caries removal was reported by 61.9% of dentists. Less experienced clinical dentists choose partial caries removal more frequently (p=0.009), if compared with dentists graduated 10 years and up ago. The use of MTA was more common among professionals working at academic environment. Besides, MTA was not mentioned by professionals working exclusively in the public health service (p=0.003). In conclusion, the time since graduation influenced the clinical conduct related to caries removal. The choice of liner materials was influenced by dentists' workplace.


Resumo Estudos baseados na prática clínica de dentistas possuem relevância vital para o entendimento dos fatores que influenciam os clínicos na escolha de uma técnica específica em detrimento de outra. Este estudo investigou quais condutas clínicas são adotadas por dentistas frente a lesões profundas de cárie. Foi avaliado como o local de trabalho, curso de pós-graduação e tempo desde a graduação influenciaram suas decisões clínicas. Foi conduzido um estudo transversal utilizando questionários auto- aplicados à dentistas no sul do Brasil (n=276). Informações relacionadas a educação continuada (especialização, mestrado ou doutorado), experiência clínica (anos desde a graduação) e local de trabalho foram investigadas. As informações sobre terapias vitais da polpa (materiais para capeamento pulpar direto, técnicas para remoção de carie em cavidades profundas e estratégias para capeamento pulpar indireto) foram coletadas por meio de perguntas específicas. Os dados foram submetidos à análise descritiva e teste exato de Fisher. A taxa de resposta foi de 68% (187). A maioria dos dentistas selecionam o hidróxido de cálcio (HC) como primeiro material para proteção pulpar direta (86,3%) e indireta (80,3%). Remoção parcial de tecido cariado foi relatado por 61,9% dos clínicos. Dentistas com menor experiência clínica optaram pela remoção parcial de tecido cariado com mais frequência (p=0,009), quando comparados a dentistas graduados há mais de 10 anos. O uso do MTA foi mais comum entre os profissionais que trabalham em ambiente acadêmico. Além disso, o MTA não foi mencionado pelos profissionais que trabalham exclusivamente no serviço público de saúde (p=0,003). O tempo desde a graduação influenciou a conduta clínica relacionada à remoção de cárie. A escolha de materiais para proteção pulpar foi influenciada pelo local de trabalho dos dentistas.


Subject(s)
Humans , Male , Female , Dental Health Services , Dental Pulp , Brazil , Surveys and Questionnaires
14.
Braz. dent. j ; 24(5): 527-531, Sep-Oct/2013. tab
Article in English | LILACS | ID: lil-697641

ABSTRACT

This study evaluated the preferences of general dentists regarding vital and nonvital tooth bleaching therapies and investigated whether the time of clinical practice and post-graduate training influence these options. A cross-sectional study was conducted using a questionnaire with closed questions applied to dentists (n=276) of a mid-sized city of the southern Brazil (Pelotas, RS). Information was collected regarding sociodemographic variables, level of specialization and time since graduation. In addition, options regarding bleaching therapies including the first choice of material, technique and clinical practice for vital and nonvital tooth bleaching therapies were included. Data were submitted to descriptive analysis and the associations were evaluated using chi-square and Fisher exact tests (α=0.05). The response rate was 68% (n=187). At-home bleaching therapy was broadly preferred (78.1%) over in-office (21.9%) bleaching. For at-home bleaching, most dentists answered to use 10% carbamide peroxide (CP) (40.2%) and >30% hydrogen peroxide (HP) (31.7%) for nonvital therapies. The majority of dentists with post-graduation training preferred at-home bleaching techniques (p=0.003). At-home bleaching therapy was also more indicated by younger dentists. No association was found between the choice for nonvital bleaching therapies and time since graduation (p=0.532) or continuous education (p=0.083). In conclusion, at-home bleaching was preferred over in-office therapies; 10% CP and >30% HP were chosen as first option agents to treat discolored vital and nonvital teeth, respectively. The time in clinical practice and the level of specialization affected dentists' choices only for vital tooth bleaching treatment.


Este estudo avaliou as preferências de cirurgiões-dentistas sobre o clareamento de dentes vitais e não-vitais. Também investigou a possível relação entre o grau de formação profissional e as decisões clínicas tomadas por estes profissionais. Para isso, realizamos um estudo transversal. Cirurgiões-dentistas (n=276) de uma cidade de médio porte do sul do Brasil (Pelotas, RS) receberam um questionário contendo perguntas sobre informação sócio-demográfica, nível de especialização e ano de graduação. Adicionalmente, foram realizadas perguntas sobre o material de primeira escolha, técnicas e práticas clínicas relacionadas a clareamento de dentes vitais e não vitais. Os dados obtidos foram submetidos à análise descritiva e as possíveis associações entre variáveis foram avaliadas utilizando o teste Qui-Quadrado e teste Exato de Fisher (p<0,05). A taxa de resposta foi de 68% (187). A técnica de clareamento caseiro supervisionada foi preferida (78,1%) em detrimento da técnica em consultório (21,9%). Os dentistas escolheram preferentemente o peróxido de carbamida (PC) a 10% para clareamento vital caseiro (40,2%) e o peróxido de hidrogênio (PH) >30% para o clareamento de dentes despolpados (31,7%). A maioria dos dentistas que realizaram cursos de pós-graduação preferiram o clareamento caseiro (p=0,003). Além disso, o clareamento caseiro foi mais indicado pelos dentistas mais jovens. Não foi encontrada relação entre as escolhas para clareamento de dentes despolpados e ano de graduação (p=0,532) ou grau de formação (p=0,083). O clareamento vital caseiro foi escolhido em detrimento das técnicas de consultório; CP a 10% e HP > 30% foram os agentes de escolha para o tratamento de dentes vitais e não vitais escurecidos, respectivamente. O tempo de prática clínica e o nível de especialização foram associados com as escolhas dos dentistas somente para clareamento de dentes vitais.


Subject(s)
Female , Humans , Male , Dentists , Practice Patterns, Dentists' , Tooth Bleaching , Brazil , Surveys and Questionnaires
15.
Braz. dent. j ; 23(4): 344-350, 2012. ilus, tab
Article in English | LILACS | ID: lil-658008

ABSTRACT

This aim of this study was to evaluate the physicochemical and biological properties of novel experimental cements (Hybrid, Paste and Resin) based on synergistic combinations of existing materials, including pH, diametral tensile strength (DTS) and cytotoxicity comparing them with mineral trioxide aggregate (MTA - Angelus®) and a glass ionomer cement (GIC) developed at our laboratory. For the physicochemical and biological tests, specimens with standard dimensions were produced. pH measurements were performed with digital pH meter at the following time intervals: 3, 24, 48 and 72 h. For the DTS test, cylindrical specimens were subjected to compressive load until fracture. The MTT assay was performed for cytotoxicity evaluation. Data were analyzed by ANOVA and Tukey's test (α=0.05). Paste group showed pH values similar to MTA, and Hybrid group presented pH values similar to GIC (p>0.05). The tested materials showed pH values ranging from alkaline to near neutrality at the evaluated times. MTA and GIC showed similar DTS values. The lowest and highest DTS values were seen in the Paste and Resin groups, respectively (p<0.05). Cell viability for MTA and experimental Hybrid, Paste and Resin groups was 49%, 93%, 90% and 86%, respectively, when compared with the control group. The photo-cured experimental resin cement showed similar or superior performance compared with the current commercial or other tested experimental materials.


O objetivo deste estudo foi avaliar propriedades físico-químicas e biológicas de novos cimentos experimentais (Híbrido, Pasta e Resinoso) baseado na combinação sinérgica de materiais existentes, incluindo pH, resistência à tração diametral (RTD) e citotoxidade, comparando-os ao MTA (Angelus®) e a um cimento de ionômero de vidro (CIV) desenvolvido em nosso laboratório. Para a realização dos testes físico-mecânico e biológico, foram confeccionados espécimes com dimensões padrão. O teste de pH foi realizado por meio de pH-metro digital nos tempos: 3, 24, 48 e 72 h. Para o teste de RTD, espécimes cilíndricos foram submetidos a carga compressiva até sua fratura. Para avaliação da citotoxidade, utilizou-se o teste MTT. Os dados foram analisados utilizando ANOVA e teste de Tukey (α=0,05). O grupo Pasta apresentou valores de pH semelhantes ao MTA, assim como o grupo Híbrido seguiu os parâmetros do CIV (p>0,05). Todos os materiais apresentaram valores de pH alcalinos ou próximosà neutralidade nos tempos avaliados. MTA e CIV apresentaram valores de RTD similares. Os menores e maiores valores observados foram do grupo Pasta e Resinoso, respectivamente (p<0,05). A viabilidade celular para os grupos MTA, Híbrido, Pasta, Resinoso, quando comparados ao grupo controle foi de: 49, 93, 90 e 86%, respectivamente. O cimento experimental Resinoso apresentou desempenho similar ou superior aos materiais comerciais e experimentais avaliados.


Subject(s)
Animals , Mice , Dental Cements/chemistry , Pulp Capping and Pulpectomy Agents/chemistry , Aluminum Compounds/chemistry , Aluminum Compounds/toxicity , Biocompatible Materials/chemistry , Bismuth/chemistry , Bismuth/toxicity , Chemical Phenomena , Calcium Compounds/chemistry , Calcium Compounds/toxicity , Cell Survival/drug effects , Composite Resins/chemistry , Composite Resins/toxicity , Drug Combinations , Dental Cements/toxicity , Fibroblasts/drug effects , Glass Ionomer Cements/chemistry , Glass Ionomer Cements/toxicity , Hydrogen-Ion Concentration , Light-Curing of Dental Adhesives , Materials Testing , Methacrylates/chemistry , Methacrylates/toxicity , Oxides/chemistry , Oxides/toxicity , Polyethylene Glycols/chemistry , Polyethylene Glycols/toxicity , Polymethacrylic Acids/chemistry , Polymethacrylic Acids/toxicity , Polyurethanes/chemistry , Polyurethanes/toxicity , Pulp Capping and Pulpectomy Agents/toxicity , Resin Cements/chemistry , Resin Cements/toxicity , Self-Curing of Dental Resins , Stress, Mechanical , Silicates/chemistry , Silicates/toxicity , Tensile Strength , Time Factors
16.
Braz. dent. j ; 22(1): 3-13, 2011. ilus
Article in English | LILACS | ID: lil-582394

ABSTRACT

Dental pulp is a highly specialized mesenchymal tissue that has a limited regeneration capacity due to anatomical arrangement and post-mitotic nature of odontoblastic cells. Entire pulp amputation followed by pulp space disinfection and filling with an artificial material cause loss of a significant amount of dentin leaving as life-lasting sequelae a non-vital and weakened tooth. However, regenerative endodontics is an emerging field of modern tissue engineering that has demonstrated promising results using stem cells associated with scaffolds and responsive molecules. Thereby, this article reviews the most recent endeavors to regenerate pulp tissue based on tissue engineering principles and provides insightful information to readers about the different aspects involved in tissue engineering. Here, we speculate that the search for the ideal combination of cells, scaffolds, and morphogenic factors for dental pulp tissue engineering may be extended over future years and result in significant advances in other areas of dental and craniofacial research. The findings collected in this literature review show that we are now at a stage in which engineering a complex tissue, such as the dental pulp, is no longer an unachievable goal and the next decade will certainly be an exciting time for dental and craniofacial research.


A polpa dental é um tecido conjuntivo altamente especializado que possui uma restrita capacidade de regeneração, devido à sua disposição anatômica e à natureza pós-mitótica das células odontoblásticas. A remoção total da polpa, seguida da desinfecção do canal radicular e seu preenchimento com material artificial proporciona a perda de uma significante quantidade de dentina deixando como sequela um dente não vital e enfraquecido. Entretanto, a endodontia regenerativa é um campo emergente da engenharia tecidual, que demonstrou resultados promissores utilizando células-tronco associadas à scaffolds e moléculas bioativas. Desta forma, esse artigo revisa os recentes avanços obtidos na regeneração do tecido pulpar baseado nos princípios da engenharia tecidual e fornece aos leitores informações compreensivas sobre os diferentes aspectos envolvidos na engenharia tecidual. Assim, nós especulamos que a combinação ideal de células, scaffolds e moléculas bioativas pode resultar em significantes avanços em outras áreas da pesquisa odontológica. Os dados levantados em nossa revisão demonstraram que estamos em um estágio no qual, o desenvolvimento de tecidos complexos, tais como a polpa dental, não é mais inatingível e que a próxima década será um período extremamente interessante para a pesquisa odontológica.


Subject(s)
Animals , Humans , Adult Stem Cells , Dental Pulp/cytology , Tissue Engineering/methods , Dental Papilla/cytology , Induced Pluripotent Stem Cells , Intercellular Signaling Peptides and Proteins , Neovascularization, Physiologic , Odontoblasts/cytology , Periodontal Ligament/cytology , Regeneration , Tissue Scaffolds , Tooth, Deciduous/cytology
17.
Braz. dent. j ; 20(4): 275-278, 2009. ilus
Article in English | LILACS | ID: lil-536314

ABSTRACT

This study compared quantitatively and qualitatively the DNA extracted from buccal cells collected from the upper or lower gutter areas. Buccal cells were collected from the upper (n=15) and lower gutter (n=15) region from 15 volunteers using a special cytobrush (Gentra), totaling 2 collections from each individual. DNA was extracted from the samples according to the manufacturer's instructions. The DNA obtained was qualitatively and quantitatively evaluated by 2 calibrated blind examiners using spectrophotometry and analysis of DNA bands (0.8 percent agarose gel electrophoresis). Data was statistically analyzed by one-way ANOVA (?=0.05). Means and standard derivation (SD) for total DNA yield from the upper and lower gutter area were 12.2 ?g (12.0) and 9.4 ?g (8.5), respectively (p=0.821). There was higher (p<0.05) DNA purity for the upper gutter (1.79; 0.05) when compared to lower gutter area (1.66; 0.10). Regarding to the DNA quality, no differences were observed between the 2 location sites, but all samples showed similar degree of degradation. In conclusion, it would be recommendable that buccal cells for DNA extraction be collected from the upper gutter area in the attempt to increase DNA purity.


O objetivo do presente estudo foi comparar quantitativamente e qualitativamente o DNA extraído de células epiteliais bucais coletadas do fundo de sulco superior e inferior. Foram coletadas células bucais do fundo de sulco superior (n=15) e inferior (n=15) de 15 voluntários utilizando escovas citológicas especiais (Gentra), totalizando 2 coletas por voluntário. Após a coleta o DNA foi extraído conforme o protocolo indicado pelo fabricante (Puregene DNA Buccal Cell Kit; Gentra Systems, Inc.). O DNA obtido foi avaliado quantitativamente e qualitativamente por dois examinadores calibrados cegos utilizando espectrofotometria e análise das bandas de DNA (gel de agarose 0,8 por cento, por eletroforese). Os dados foram submetidos a ANOVA a um critério, com p<0,05. As médias e desvio padrão (DP) para o rendimento total de DNA do fundo de sulco superior e inferior foram respectivamente 12,2 ?g (12,0) e 9,4 ?g (8,5) (p=0,821). Houve maior (p<0,05) pureza de DNA no fundo de sulco superior (1,79; 0,05) quando comparado com o fundo de sulco inferior (1,66; 0,10). Quanto à qualidade do DNA, não foi observado diferenças entre os dois locais testados, no entanto todas as amostras mostraram níveis de degradação semelhantes. Em conclusão seria recomendável coletar células bucais, para extração de DNA, do fundo de sulco superior na tentativa de aumentar a pureza do DNA.


Subject(s)
Adolescent , Adult , Humans , Young Adult , DNA , In Vitro Techniques , Mouth Mucosa/cytology , Specimen Handling/methods , Analysis of Variance , Mandible , Maxilla , Reproducibility of Results , Single-Blind Method , Young Adult
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