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J. res. dent ; 9(5): 15-19, sep.-oct2021.
Article in English | LILACS-Express | LILACS | ID: biblio-1362914


Introduction: Different NiTi rotary systems have been developed to improve efficiency and retreatment success rates. Aim: To evaluate the Protaper Universal retreatment system and WaveOne instrument in removing the filling material from curved canals during retreatment. Materials and Methods: Thirty mesial root canals of extracted human mandibular molar teeth were randomly allocated into 2 groups (n=15). In the PT group, retreatment was performed with ProTaper Universal Retreatment according to the manufacturer's instructions. In the WO group, was used WaveOne Primary. ProTaper Universal F2 and F3 were used to achieve the apical diameter in both groups. The samples were scanned by micro-computed tomography pre and postoperatively to evaluate the filling material remaining. The percentage of material filling was compared between groups using Student's T test and in the same group among thirds was compared using Kruskal-Wallis followed by Dunn's post hoc test. Results: The filling material remaining was not statistically different between the groups (p≥0.05). The apical third presented a greater amount of remaining filling material when compared with the cervical third for both groups (p<0.05). Conclusion: Rotary and reciprocating techniques can effectively, but not completely, remove the filling materials from the root canal system. The apical third presented a more significant amount of remaining filling material.

Clinics ; 76: e3056, 2021. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1339714


OBJECTIVES: Owing to the fact that obstructive sleep apnea (OSA) is an underreported disease, the strategy used for the diagnosis of OSA has been extensively dissected to devise a simplified process that can be accessed by the public health services. Polysomnography (PSG) type I, the gold standard for the diagnosis of OSA, is expensive and difficult to access by low-income populations. In this study, we aimed to verify the accuracy of the oxyhemoglobin desaturation index (ODI) in comparison to the apnea-hypopnea index (AHI) using a portable monitor. METHODS: We evaluated 94 type III PSG home test results of 65 elderly patients (69.21±6.94 years old), along with information, such as the body mass index (BMI) and sex, using data obtained from a clinical trial database. RESULTS: A significant linear positive correlation (r=0.93, p<0.05) was observed between ODI and AHI, without any interference from sex, BMI, and positional component. The sensitivity of ODI compared to that of AHI increased with an increase in the severity of OSA, while the specificity of ODI in comparison to that of AHI was high for all degrees of severity. The accuracy of ODI was 80.7% for distinguishing between patients with mild and moderate apnea and 84.4% for distinguishing between patients with moderate and severe apnea. CONCLUSION: The ODI values obtained in uncontrolled conditions exhibited high sensitivity for identifying severe apnea compared to the AHI values, and correctly identified the severity of OSA in more than 80% of the cases. Thus, oximetry is promising strategy for diagnosing OSA.

Braz. oral res. (Online) ; 35: e009, 2021. graf
Article in English | LILACS, BBO | ID: biblio-1132746


Abstract: This study analyzed the consequences of the disordered expansion of Dentistry courses on the distribution of professionals, the job market, and limitations of the National System of Higher Education Assessment (SINAES) developed as a guarantee of education quality. This observational, descriptive, and analytical study used secondary data from several official databases. The number of courses was obtained from the e-MEC registry. From the Higher Education Census, the study collected historical series of courses offered, number of candidates per open seat, number of individuals who initiated and completed the course, and information about professors in the public and private schools. The reports related to Dentistry courses from the National Health Council were also analyzed. The performance of undergraduate students was assessed from synthesis reports of Enade from 2004 to 2016. The number of dentists and their regional distribution was based on the Federal Dental Council, and Brazilian population and gross domestic product were collected from the Brazilian Institute of Geography and Statistics. Dentistry courses in Brazil grew exponentially from 1856 to 2020; among the 544 authorized courses, 82 currently have not yet started their activities. The fast expansion of courses in Brazil has worsened the regional asymmetries in the supply of dentist, and the SINAES has not been able to fully assure the quality of Dentistry courses. Brazilian dentistry, which has increased its scientific and technological development since the 19th century, with outstanding intellectual production, is at risk of a collapse due to a plethora of dentists.

Humans , Schools , Students , Brazil , Dentistry , Educational Status
Rev. ABENO ; 18(3): 105-113, jul.-set. 2018. ilus
Article in English | LILACS, BBO | ID: biblio-968947


Dental radiology is an important subject to Dental undergraduate education. Along with other disciplines, it plays a key role in diagnostics, the starting point for patient care. In this way, a specific international guideline for Dental Radiology curriculum was published in 2007. The aim of this study was to develop and validate two distinct instruments, a self-administered online survey, and an interview script, both designed for dental radiology education research. The processes for developing and validating the instruments are described, and the final documents are presented. There were several steps in the validation process of the research instruments in this study, such as translation, cultural adaptation, expert evaluation, read-aloud sessions and pilot testing. This detailed process guarantees control of the variables and helps to avoid bias in regard to the interview and the quantitative/qualitative method analysis (AU).

Radiology , Curriculum/standards , Validation Study , Education, Dental/methods , Evaluation Studies as Topic/methods , Interview
Rev. Bras. Odontol. Leg. RBOL ; 4(3): [13-23], set.-dez.2017.
Article in Portuguese | LILACS, BBO | ID: biblio-912413


Introdução: A determinação do desenvolvimento esquelético é uma prática comum ao exercício da Odontologia, tanto para fins ortodônticos quanto forenses. Diversos métodos utilizam radiografias e, tendo em vista o crescente emprego da tomografia computadorizada, torna-se importante o conhecimento de todas as potencialidades destas imagens na prática pericial. Objetivo: O objetivo deste estudo foi descrever parâmetros morfológicos das vértebras cervicais C1 e C2 em imagens axiais de tomografia computadorizada por feixe cônico (TCFC) em cada um dos seis estágios maturacionais propostos por Hassel e Farman (1995) para a análise das vértebras no plano sagital. Material e Método: A partir de um banco de dados, foram avaliadas imagens de TCFC de 73 indivíduos de 8 a 18 anos, as quais foram classificadas no plano sagital. Em seguida, as vértebras C1 e C2 foram avaliadas no plano axial e suas características morfológicas registradas em um instrumento de coleta de dados. Foram, então, calculados os percentuais de cada característica dentro dos estágios maturacionais. Resultados: Observou-se na caracterização morfológica axial da C2 a tendência de fusionamento da sincondrose subdental nas fases de Maturação (5) e Finalização (6), ocorrendo em 90% e 66,6% dos casos, respectivamente. Conclusão: O estudo identificou padrões morfológicos axiais da C2 predominantes nas fases 5 e 6 de maturação das vértebras cervicais propostas por Hassel e Farman (1995), podendo contribuir para casos forenses de estimativa da idade.

Introduction: The skeletal development determination is a common practice in Dentistry, both for orthodontic and for forensic purposes. Several methods are based on radiographs, but considering the increase in computed tomography exams more contemporary investigations of these methods became important to explore their forensic purposes. Objective: This study aimed to describe the morphological parameters of the C1 and C2 vertebrae in axial cone beam computed tomography (CBCT) images, at each of the six maturational stages proposed by Hassel and Farman. Material and Method: From a database, CBCT images of 73 individuals aged 8 to 18 years were evaluated and classified in the sagittal plane. Then the C1 and C2 vertebrae were evaluated in the axial plane and their morphological characteristics were recorded in a data collection instrument. The percentage of each feature within the maturational stages was calculated. Results: In the axial morphological characterization of C2, the tendency of fusion of the subdental was marked in Maturation (5) and Finishing (6) phases, with 90% and 66.6% of cases, respectively. Conclusion: The study identified axial morphological patterns of C2 that predominate in phases 5 and 6 of maturation of the cervical vertebrae proposed by Hassel and Farman, and may contribute to age estimation in forensic cases.

Humans , Male , Female , Cervical Vertebrae , Cone-Beam Computed Tomography , Forensic Dentistry , Forensic Anthropology , Growth and Development
Braz. dent. j ; 28(5): 592-596, Sept.-Oct. 2017. tab, graf
Article in English | LILACS | ID: biblio-888696


Abstract The aim of this study was to evaluate the radiopacity of different gutta-percha points (Endo Points®, Dentsply®, Tanari®, Meta®, Roeko® and Odous®) in samples of 1 mm thick as established by ANSI/ADA Specification #57 and ISO 6876/2001, in comparison with thinner samples. Twelve test specimens for each material, four for each thickness (0.3, 0.6, and 1 mm and diameter of 8 mm), were laminated and compressed between two polished glass plates until the desirable thickness. Digital radiographs were obtained along with a graduated aluminum stepwedge varying from 1 to 10 mm in thickness. The X-ray unit was set at 70 kVp, 10 mA and 0.4 s exposure time, at a focal distance of 36 cm. One calibrated observer quantified the average values of pixels with Adobe Photoshop® software. Data were analyzed using ANOVA and Tukey tests, at 5% significance level. At 0.6 and 1 mm thickness, all the tested materials showed radiopacity higher than 3 mm of aluminum (reference value). At 0.3 mm thickness, Odous and Tanari presented significantly less radiopacity than the reference, and the other materials showed similar radiopacity to the reference. The study concluded that the materials demonstrated different radiopacities and all had values above the minimum recommended by ANSI/ADA specification #57, being Odous and Tanari less radiopaque than the reference value in thinner samples (0.3mm).

Resumo O objetivo deste estudo foi avaliar a radipacidade de diferentes pontas de guta-percha (Endo Points®, Dentsply®, Tanari®, Meta®, Roeko® e Odous®) em amostras de 1 mm de espessura, conforme estabelecido pela especificação #57 da ANSI/ADA e pela ISO 6876/2001, em comparação com amostras de menor espessura. Doze amostras de cada material, quatro para cada espessura (0,3, 0,6 e 1 mm; 8 mm de diâmetro), foram confeccionadas por meio de laminação e compressão entre duas lâminas de vidro polidas, até a espessura desejada. Radiografias digitais foram obtidas juntamente com uma escala de alumínio graduada, com espessuras variando de 1 a 10 mm. O aparelho de raios X foi ajustado para 70 kVp, 10 mA, 0,4s de tempo de exposição, com distância focal de 36 cm. Um observador calibrado quantificou a média dos valores de pixel no programa Adobe Photoshop®. Os dados foram analisados utilizando os testes ANOVA e Tukey, com nível de significância de 5%. Nas espessuras de 0,6 e 1 mm, todos os materiais testados apresentaram radiopacidade maior do que 3 mm de alumínio (valor de referência). Na espessura de 0,3 mm, Odous e Tanari apresentaram radiopacidade significativamente menor que a referência, e as outras marcas mostraram radiopacidade semelhante à referência. Conclui-se que os materiais apresentaram diferentes radiopacidades e todos mostraram valores acima do mínimo recomendado pela especificação #57 da ANSI/ADA, sendo Odous e Tanari menos radiopacos do que o valor de referência nas amostras mais finas (0.3 mm).

Gutta-Percha , Materials Testing
Stomatos ; 22(43): 20-30, 20161231.
Article in English | LILACS-Express | LILACS | ID: biblio-832324


Cross-sectional study of 36 children with acute lymphoblastic leukemia (ALL) or acute myeloid leukemia (AML). Intraoral examination and oral hygiene assessment were performed in all patients. Information was also obtained from interviews of patients' mothers and a review of medical records. Results: The sample was largely composed of boys (58.3%), ages 5­9 years. The most commonly used chemotherapy regimen was the BFM-95 protocol. Most children (83.3%) had a record of some oral manifestation during treatment. On intraoral examination, 17 children (50%) were found to have at least one oral manifestation. The most frequent manifestation was also mucositis (26.5%), followed by gingival bleeding (23.4%). Lower maternal educational level was associated with increased frequency of mucositis, as were induction chemotherapy and maintenance chemotherapy after relapse. Conclusions: Oral abnormalities were common in children receiving chemotherapy and mucositis was the most prevalent manifestation. Oral lesions were associated with the induction phase of chemotherapy. Mucositis was not associated with oral health status.

Estudo transversal de 36 crianças com leucemia linfoblástica aguda (LLA) ou leucemia mieloide aguda (LMA). Exame intraoral e avaliação de higiene bucal foram realizados em todos os pacientes. A informação também foi obtida a partir de entrevistas com as mães dos pacientes e uma revisão dos registros médicos. Resultados: A amostra foi composta em grande parte dos meninos (58,3%), com idades entre 5-9 anos. O regime de quimioterapia mais comumente utilizado foi o protocolo BFM-95. A maioria das crianças (83,3%) teve um registro de alguma manifestação oral durante o tratamento. Ao exame intraoral, 17 crianças (50%) apresentaram ter pelo menos uma manifestação oral. A manifestação mais frequente foi mucosite (26,5%), seguido por sangramento gengival (23,4%). Baixa escolaridade materna foi associada com aumento da frequência de mucosite, assim como a quimioterapia de indução e quimioterapia de manutenção após recaída. Conclusões: Anormalidades orais são comuns em crianças que receberam quimioterapia e mucosite foi a manifestação mais prevalente. As lesões foram associados com a fase de indução da quimioterapia. Mucosite não foi associado com o estado de saúde oral.

ROBRAC ; 25(73): 71-79, abr./jun. 2016. ilus
Article in Portuguese | LILACS-Express | LILACS | ID: biblio-875229


O preparo do canal radicular constitui-se em uma fase importante do tratamento endodôntico, por possibilitar a limpeza e a desinfecção do sistema de canais, além da modelagem, que permite a adequada acomodação do material obturador e o selamento endodôntico. Com o advento dos instrumentos de níquel-titânio, de reconhecida flexibilidade, tem-se observado considerável facilidade na realização do preparo e menor índice de desvio apical em canais curvos. Sendo assim, o objetivo deste estudo foi avaliar o desgaste produzido nas paredes dos canais mésio-vestibulares de primeiros molares inferiores pelos sistemas ProTaper®, BioRaCe® e instrumentos manuais, nos terços cervical, médio e apical. Para tal, foram utilizados trinta e nove primeiros molares inferiores, divididos em três grupos. Cada dente foi inicialmente radiografado nos sentidos vestíbulo-lingual e proximal, por meio de raio x digital. Após o preparo dos canais mésio-vestibulares, os dentes foram novamente radiografados. Por meio do programa Adobe Photoshop®, as radiografias iniciais e finais de ambas as incidências foram digitalmente sobrepostas e, através da subtração das imagens, o desgaste foi evidenciando nas três dimensões. Foram atribuídos escores relativos à quantidade de desgaste gerado nos terços cervical, médio e apical do canal radicular. Os resultados mostraram diferença estatisticamente significativa apenas no terço apical, onde os instrumentos ProTaper® produziram um desgaste significativamente menor do que os instrumentos manuais. Para os instrumentos BioRa-Ce® não foram encontradas diferenças significativas. Também foi possível observar que os sistemas ProTaper® e BioRaCe® deixaram áreas do canal radicular não instrumentadas principalmente no terço apical, seguido pelo terço médio.

The root canal preparation has been considered one of the most important phases of the endodontic treatment because it allows cleaning and disinfection of the canal system and its modeling, it also allows the proper accommodation of the filling material and endodontic sealing. With the advent of nickel-titanium instruments, which are known for their flexibility, there has been reasonably improvement in the quality of the preparation. In that way, goal of this paper is to evaluate the wear produced in the walls of mesiobuccal canals of first mandibular molars by ProTaper® system, BioRaCe® and hand instruments at the cervical, middle and apical thirds. Thirty-nine mandibular first molars divided into three groups were used. Each tooth was initially x-rayed in buccolingual and proximal direction through a digital x-ray. After preparation of mesiobuccal canals, they were x-rayed again. Through Adobe Photoshop software, the initial and final x-rays of both incidences were digitally superimposed and by subtraction of the images, canal wear was shown in three dimensions. Scores were given to the root canal related to the amount of wear generated in the cervical, middle and apical thirds of root canal. The results showed statistically significant differences only in the apical third, where Pro-Taper® instruments produced a significantly lower wear than the hand instruments. For BioRaCe® instruments, no significant differences were found. It was also possible to observe that ProTaper® BioRaCe® systems left non-instrumented areas in the root canal, mainly in the apical third, followed by the middle third.

Full dent. sci ; 7(26): 128-133, abr. 2016. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-786858


A proposta deste estudo foi avaliar, ex vivo, a influência da conicidade dos instrumentos rotatórios de níquel-titânio (NiTi) no transporte apical de canais radiculares curvos com tomografia computadorizada. Vinte primeiros molares superiores humanos extraídos foram selecionados e divididos em dois grupos. Os canais radiculares no GrupoHERO 642 (n=10) foram preparados com instrumentos rotatórios de NiTi do sistema HERO 642, conicidade 0,02. Os canais radiculares do Grupo EASY ProDesign (n=10) foram preparados com instrumentos rotatórios de NiTi EASY ProDesign, conicidades múltiplas. O transporte apical foi mensurado comparando imagens de tomografia computadorizada antes do preparo, após o preparo com instrumentos # 35/.02 (Grupo HERO 642) e instrumento # 35/.04 (Grupo EASY ProDesign), e após o preparo com instrumento # 45/.02 (Grupo HERO 642) e instrumento # 40/.04 (Grupo EASY ProDesign). Os dados foram analisados utilizando ANOVA e o nível de significância p. 05. Os valores médios de transporte apical em milímetros (mm) para o Grupo HERO 642 foram 0,93 ± 0,48 mm (#35/.02) e 1,48 ± 0,63 mm (# 45/.02) e para o Grupo EASY ProDesign foram 0,82 ± 0,85 mm (# 35/.04) e 1,03 ± 0,92 mm (# 40/.04). Os instrumentos rotatórios de NiTi de conicidade 0,02 e de múltiplas conicidades mostraram desempenho similar em relação ao transporte apical em canais radiculares curvos.

The aim of this study was to evaluate ex vivo the influence of the taper of nickel-titanium (NiTi) rotary instruments in apical transportation of curved root canals with computed tomography. Twenty extracted maxillary first molars were selected and divided into two groups. The mesiobuccal root canals in Group HERO 642 (n=10) were instrumented with HERO 642 rotary instruments, 0.02 taper. The mesiobuccal root canals in Group EASY ProDesing (n=10) were instrumented with EASY ProDesign rotary instruments, multiple tapers. Apical transportation was measured by comparing tomographic images before preparation, after the preparation with size 35, 0.02 taper (Group HERO 642) and size 35, 0.04 taper (Group EASY ProDesing), after the preparation with size 45, 0.02 taper (Group HERO 642) and size 40, 0.04 (Group EASY ProDesing). Data were analyzed using ANOVA, and significance was set at p.05. The preparation of curved root canals can be accomplished with instruments of diameters and taper larger than 0.02.

Humans , Dental Pulp Cavity , Dental Instruments , Root Canal Preparation/methods , Cone-Beam Computed Tomography/instrumentation , Analysis of Variance , Nickel
Rev. ABENO ; 16(4): 114-124, 2016. ilus, tab, graf
Article in English | LILACS, BBO | ID: biblio-882214


Considering the difficulties to obtain good quality dental radiographic images taken by dental students, this study aimed to develop and to evaluate a Learning Object (LO), where the student is able to use a computer to simulate radiograph expositions, modifying the factors that interfere with the radiographic image quality. This study was exploratory and descriptive. For that, 48 periapical radiographs were obtained from the posterior region of a dried bone human jaw with different combinations of kVp/mA, film speed, focal distance, and time of exposition. Each radiograph received a "label" according to the factors used and also with a comment making a value judgment regarding its quality, its applicability for the diagnosis, and, if necessary, suggestions or questions about the required adjustments. In the LO screen students could simulate different situations (combination of factors) until obtaining the best result. Dental students (n=64) were divided into two groups. During the first week both groups participated in a theoretical lecture, and, subsequently, answered a test/assessment on the subject. In the following week Group 1 students solved practical exercises related to the subject, in the laboratory, and answered a second test/assessment. Students from Group 2 performed the activity with the LO in the laboratory. At the end of the activity, they also answered the test/assessment, and an open-ended questionnaire to evaluate the activity. At week3 the same activities from the week before were repeated, reversing the classes, and, then, a third test/assessment was applied. Statistical tests showed that there were no statistical differences in the groups' performance in any of the different moments of the evaluation. The use of the LO did not improved significantly the frequency of students' correctness (number of correct responses) in the tests/assessments. However, the LO methodology was considered very good, because, according to the participants, it was a tool that stimulates learning. The use of the LO, in addition to the practical exercises, contributed to the learning process on the factors that might interfere on the radiographic image (AU).

Considerando as dificuldades apresentadas pelos estudantes de odontologia na obtenção de imagens radiográficas de qualidade, o presente estudo teve por objetivos desenvolver e avaliar um objeto de aprendizagem (OA) no qual o usuário possa simular exposições radiográficas, modificando os fatores que interferem na qualidade da imagem radiográfica. Para este estudo exploratório descritivo, 48 radiografias periapicais foram obtidas da região posterior de uma mandíbula humana seca, com diferentes combinações de kVp/mA, sensibilidade do filme, distância focal e tempo de exposição. A cada imagem foi atribuído um texto sobre sua qualidade, aplicabilidade ao diagnóstico e, se necessário, sugestões ou questões sobre ajustes requeridos. Na tela do OA os estudantes podem simular situações combinando os diferentes fatores até que obtenham o melhor resultado. Para a avaliação do OA, 64 alunos de graduação foram divididos em dois grupos. Todos os alunos participaram da aula teórica e realizaram um teste. Na semana seguinte o Grupo 1 executou exercícios práticos e o Grupo 2 utilizou o OA, ambos respondendo a um segundo teste. Na terceira semana os grupos inverteram as atividades e foi aplicado o terceiro teste. Um questionário aberto foi respondido por todos os alunos com intuito de avaliar qualitativamente o OA. Não houve diferença estatisticamente significante quanto aos acertos nos testes entre os grupos. O OA não melhorou o desempenho dos estudantes em testes, porém foi considerado como uma metodologia muito boa, que estimula o aprendizado. A utilização do OA somou-se aos exercícios práticos, melhorando no aprendizado dos fatores que podem interferir na imagem radiográfica (AU).

Humans , Male , Female , Education, Dental , Radiography, Dental/instrumentation , Students, Dental , Teaching Materials , Statistics, Nonparametric , Surveys and Questionnaires
Stomatos ; 21(40)jan. jun. 2015.
Article in English | LILACS | ID: biblio-1731


Specifi cally for the dentistry fi eld, the pact for health expresses the relevance of the process of evaluation and monitoring of primary care programs and services. The aim of the present study was to analyze the oral health poli cy of the city of Porto Alegre, Southern Brazil, in the context of the decentralization in health care implemented by the Brazilian Unifi ed Health System (Sis tema Único de Saúde, SUS), based on the database of the Outpatient Information System (Sistema de Informações Ambulatoriais, SIA). This descriptive, quantitative, normative/evaluative study analyzed secondary data from a historical series of dental procedures conducted in Porto Alegre and recorded by the SIA-SUS from 2008 to 2012. Data were collected directly from the SIA-SUS database. Data were also obtained from city's management reports from 2010 to 2013. Results show that the coverage of both Programmatic First Dental Consultation and Collective Supervised Toothbrushing Action was lower than that established in the pact.

Especifi camente para o campo da odontologia, o pacto pela saúde expressa a relevância no processo de avaliação e monitoramento de programas e serviços da atenção básica. O objetivo do presente estudo foi analisar a políti ca de saúde bucal do município de Porto Alegre no contexto da descentralização da saúde implementada pelo Sis tema Único de Saúde (SUS), a partir do banco de dados do Sistema de Informações Ambulatoriais (SIA). Este estudo foi do tipo descritivo, quantitativo, de caráter avaliativo normativo, o qual utilizou dados secundários, a partir da série histórica da produção de procedimentos odontológicos realizados em Porto Alegre e registrados pelo SIA-SUS no período de 2008 a 2012. A coleta dos dados foi realizada diretamente no banco de dados do SIA-SUS. Dados também foram retirados dos relatórios de gestão do município nos anos de 2010 a 2013. Os resultados demonstram que tanto a cobertura da Primeira Consulta Odontológica Programática quanto a Ação Coletiva de Escovação Dental Supervisionada foram inferiores ao pactuado.

Oral Health , Dental Health Services , Health Promotion , Primary Health Care , Health Services Accessibility , National Health Programs
RFO UPF ; 19(1)abr. 2014.
Article in English | LILACS-Express | LILACS | ID: lil-726453


Objective: This study aimed to evaluate the canal cen-tering ability and topography of BioRaCeTM (BR), Wi-zard CD PlusTM (WP), and Wizard NavigatorTM (WN) instruments. Materials and method: mesiobuccal roots of upper first molars were selected and randomly dis-tributed in three groups (n=10), according to the rota-ry system used for instrumentation. Canal transporta-tion was assessed at 2, 4, 6, and 8 mm from the root apex, by subtracting cone bean computed tomography (CBCT) images taken before and after preparation. The root canal center was marked in pre- and post-prepa-ration images, and the distance between these points was measured in bucco-palatal (BP) and mesio-distal (MD) directions. New instruments were analyzed un-der scanning electron microscopy (SEM) regarding their surface finishing, topographical features, and surface defects. The SEM images were obtained at the tip of the instrument, and at 5 mm from the tip. Data of the canal centering ability were analyzed by two-way ANOVA (? = 0.05). Results: regardless of root level (2, 4, 6, and 8 mm), all groups presented canal transportation in both directions. Significant differences were not detected (p > 0.05). Surface finishing was regular in the BR group with rounded transitional angle. Cutting edges had a sharp angle in BR and WN groups, while WP instru-ments had a flattened angle. Conclusion: despite such topographical differences between the rotary instru-ments tested, none of them were able to exactly main-tain the original root canal center, and no significant differences were observed among groups.

Ortho Sci., Orthod. sci. pract ; 7(26): 160-165, 2014. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-729978


Foram analisadas as alterações transversais após expansão rápida cirurgicamente assistida da maxila (ER-CAM) em uma amostra de 37 pacientes adultos com deficiência maxilar esquelética transversal, tratados com o aparelho expansor de Haas e a técnica cirúrgica proposta por Bell2 (1976). Foram comparadas as medidas lineares inter-caninos e inter-primeiros molares superiores nos modelos da documentação ortodôntica inicial, ao final da expansão rápida da maxila e um ano após esta. A ANOVA utilizando o delineamento de medidas repetidas, complementada pelo teste de comparações múltiplas de Tukey (a = 1%), evidenciou diferenças significativas nos três momentos para as duas medidas propostas. Os resultados obtidos no presente estudo permitem concluir que as medidas de dimensões transversais da maxila aumentam ao final da expansão, mais na região anterior que na posterior; diminuem após transcorrido um ano do final da expansão, mais na região anterior que na posterior; e a recidiva observada após o período de um ano não supera o ganho obtido com a expansão, tanto na região anterior quanto na posterior.

Transverse changes after surgically assisted expansion of the maxilla were assessed in a group of thirty-seven adult patients with transversal skeletal deficiency, which used Haas device and were submitted to Bell2 (1976) surgical procedure. Transversal measurements between upper canines and first molars were obtained before treatment, immediately after expansion and after one year. The ANOVA for repeated measures and Tukey’s multiple comparison Test (a = 1%) showed significant differences among the three moments for both measurements proposed. The results lead to the conclusion that the transverse dimensions increase more in the anterior region of the maxilla at the end of the expansion, decrease after one year more in the anterior region, and that the relapse does not exceeds the gain in both regions.

Humans , Male , Female , Adult , Orthodontics , Palatal Expansion Technique , Surgery, Oral
RSBO (Impr.) ; 10(4): 301-305, Oct.-Dec. 2013. ilus, tab
Article in English | LILACS-Express | LILACS | ID: lil-766081


Introduction and Objective: The objective of this study was to analyze, in vitro, the remaining tissue at the risk zone in the mesial canals of the mandibular molars after cervical flaring using LA AXXESS® drill. Material and methods: Thirty molars were randomly divided into two experimental groups. Twenty teeth received cervical flaring using LA AXXESS® drill (group A), and ten were kept as control group (group B) without undergoing any kind of flaring. The teeth had their mesial roots cross-sectioned at a 3.5 mm standardized height apical to the cementum junction. Specimens were scanned and analyzed by a professional previously trained and calibrated. In order to measure the distances of the remaining tissue in relation to the furca, a Photoshop® program ruler version 7.0 was used. Results and Conclusion: It was possible, through statistical analysis using Student's t-test for paired and independent samples with a 5% significance level, to verify that there was no difference regarding the remaining tissue at the risk zone between the group that had cervical flaring and the control group.

Stomatos ; 19(37): 1-3, Jul.-Dec. 2013.
Article in English | LILACS-Express | LILACS | ID: lil-766116
Stomatos ; 18(34): 40-51, Jan.-Jun. 2012. ilus, tab
Article in English | LILACS, BBO | ID: lil-693974


Mini-screw implants have been commonly used for orthodontic anchorage. However, the behavior of implants may vary according to their location, inclination, loading position and loading direction. The objective of this study was to apply finite element to analyze stress distribution around mini-implants inserted into the buccal cortical bone, in the inferior molar region, when a force of 3 N was applied, varying implant inclination and loading direction, also simulating immediate loading and osseointegration conditions. We carried out a threedimensional analysis of a human cadaveric mandible and of a 9 mm length, 1.5 mm diameter titanium implant. The implant model was introduced into the buccal cortical bone, between the first and second mandibular molars. Finite-element analysis of the implant-bone structure was carried out applying a constant force of 3 N at varying angles (15, 30, 45, 60, 75, and 90 degrees), and in five different positions along the bone surface axis (perpendicularly, vertically at ± 10 degrees, and horizontally at ± 20 degrees). Out of all combinations tested, stress affected only the cortical bone, not being intense enough to cause cortical bone resorption. Stress distribution varied slightly (8.55 to 38.74 Mpa) due to implant inclination and loading direction. Immediate loading generated greater tensions (12.70 to 38.74 Mpa) when compared to osseointegration (8.55 to 21.44 Mpa). A force of 3 N did not result in a tension that could cause cortical bone resorption. Immediate loading resulted in greater tensions to the bone, regardless of implant inclination and loading direction.

Mini-implantes têm sido utilizados para ancoragem ortodôntica e seu comportamento pode variar de acordo com a sua localização e inclinação, com a posição e a direção da carga aplicada. Este estudo analisou a distribuição de tensões ao osso em torno de mini-implantes inseridos no osso cortical na região de molares inferiores, quando uma carga de 3 N é aplicada, variando a inclinação do implante e a direção da força,assim como situações de carga imediata e osseointegração. Uma mandíbula humana e um implante de titânio com 9 mm de comprimento e 1,5mm de diâmetro foram modelados, com o implante introduzido na face vestibular entre o primeiro e o segundo molares. Este modelo foi analisado pelo método de elementos finitos aplicando força constante de 3N com angulagens de 15, 30, 45, 60 e 75 graus, com o implante perpendicular ao osso e com inclinação vertical de 10 graus e horizontal de 20 graus. Em todas as combinações testadas a tensão afetou apenas o osso cortical, porém não apresentou intensidade suficiente para resultar em reabsorção óssea. Sua distribuição variou (8,55 a 38,74 Mpa) em função da inclinação do implante e da direção da carga. A situação de carga imediata gerou maiores tensões (12,70 a 38.74 Mpa) quando comparada à osseointegração (8,55 a 21,44 Mpa). Conclui-se que uma força de 3N não resulta em tensão que possa causar reabsorção da cortical óssea e que a carga imediata produz maior tensão ao osso, independentemente da inclinação do implante e da direção da força.

Dental Implants , Finite Element Analysis , Orthodontics
Full dent. sci ; 1(2): 183-185, Aug. 15, 2010.
Article in Portuguese | LILACS, BBO | ID: lil-605600


O objetivo deste trabalho foi revisar a literatura sobre a o diagnóstico, conduta e seqüelas clínicas frente aos casos de pacientes que apresentam dentes anquilosados na dentição decídua e mista. A etiologia, tratamento e as consequências da presença dentes decíduos anquilosados ainda é escassa. Portanto, uma extensa busca na literatura sobre o assunto poderá colaborar para um melhor diagnóstico e conduta clínica pelo cirurgião dentista.

The objective of this study was to perform a literature review in the diagnosis, conduct and clinical sequels in patients with dental ankylosis in deciduous and mixed dentition. The etiology, treatment and consequences of the presence of dental ankylosis is still scarce. Therefore, a extensive search in the literature reports on the issue, could collaborate for a better diagnosis and clinical practice of the surgeon dentist.

Tooth Ankylosis/diagnosis , Dental Occlusion , Dentition, Mixed , Diagnosis , Prevalence , Tooth, Deciduous
Acta cir. bras ; 26(1): 2-6, jan.-fev. 2011. ilus, tab
Article in English | LILACS | ID: lil-572226


Purpose: To evaluate new bone formation, by the analysis of optical density, in rat femoral defects filled with calcium phosphate cement (CPC) and bioactive glass (BG). Methods: Twenty-one rats were divided into three groups, Group I (CPC), Group II (BG), and Group III (control), and assessed after 7, 15, and 30 days. Three bone cavities were made in the left femur and filled with CPC, BG, and no material (control). Digital images were obtained and the results were subjected to statistical analysis of variance (ANOVA), complemented by the Friedman and Kruskal-Wallis nonparametric tests, with a significance level of 5 percent. Results: Regarding optical density, Group I showed statistical values significantly higher than Group III and also higher, although not statistically significant, than Group II, in all observation periods. When Groups II and III were compared, Group II showed higher optical density values, without statistically significant differences, in all periods. Conclusion: The biomaterials analyzed showed higher optical density in relation to the control group in all observation periods, calcium phosphate cement being the best option in the repair of bone defects, but without statistically significant differences in relation to bioactive glass.

Objetivo: Avaliar a neoformação óssea, por meio da análise de densidade óptica, em cavidades em ratos preenchidas com cimento de fosfato de cálcio (CFC) e vidro bioativo (VB). Métodos: Utilizou-se 21 ratos distribuídos em três grupos, sendo Grupo I (CFC), Grupo II (VB) e Grupo III (controle) avaliados em 07, 15 e 30 dias. Foram realizadas três cavidades, junto ao fêmur esquerdo e preenchidas com CFC, VB e sem material (controle). Realizaram-se radiografias digitais e os resultados foram submetidos à análise estatística de variância (ANOVA), complementada através dos testes não-paramétricos de Friedman e Kruskal-Wallis, com níveis de significância de 5 por cento. Resultados: Comparando a densidade óptica o Grupo I apresentou valores estatísticos significativamente maiores que o Grupo III, e também apresenta valores maiores, sem diferença estatística significativa, em todos os períodos, quando comparado ao Grupo II. Quando comparamos o Grupo II com o Grupo III, o Grupo II apresenta valores maiores de densidade óptica, sem diferença estatística significativa, em todos os períodos. Conclusão: Observou-se maior densidade óptica dos biomateriais em relação ao grupo controle em todos os períodos avaliados, sendo o cimento de fosfato de cálcio a melhor opção para restauração de cavidades ósseas, porém sem diferenças estatisticamente significantes em relação ao vidro bioativo.

Animals , Male , Rats , Bone Cements/therapeutic use , Bone Regeneration/physiology , Bone Substitutes/therapeutic use , Calcium Phosphates/therapeutic use , Femur/injuries , Glass , Bone Density , Bone Cements/chemistry , Bone Substitutes/chemistry , Calcium Phosphates/chemistry , Femur , Glass/chemistry , Random Allocation , Rats, Wistar , Statistics, Nonparametric
Rev. odonto ciênc ; 26(2): 121-125, 2011. tab
Article in English | LILACS, BBO | ID: lil-611657


PURPOSE: In Brazil, the SINAES is a process that is currently used to assess higher education institutions, undergraduate programs and students' performance on the ENADE national exam. This study aimed at assessing the Brazilian undergraduate programs in Dentistry, inquiring if the evaluation results induced to changes to improve the teaching-learning process. METHODS: This cross-sectional study utilized a questionnaire that was e-mailed to 165 professors/coordinators of undergraduate programs in Dentistry in Brazil in 2003/2004. The data analysis was based on the themes of the various open- and closed-ended questions: questions 1, 2, 3 and 4 referred to the evaluation of each institution and its undergraduate program, whereas questions 5, 6 and 7 referred to the ENADE. RESULTS: Changes to improve the quality of teaching in Dentistry and the education of new professionals were driven by the results of the evaluation. These changes were implemented at all institutions that returned the completed questionnaires. CONCLUSION: Improvements in the quality of Brazilian Dentistry will only be possible if the education of the students and the professors is improved.

OBJETIVO: No Brasil, o SINAES é a proposta de avaliação da educação superior atualmente em vigência e que avalia as instituições de educação superior, os cursos de graduação e o desempenho dos estudantes (ENADE). Este estudo abordou a avaliação dos cursos de Odontologia em 2003 e 2004 para observar se os resultados da avaliação induziram melhora no processo ensino-aprendizagem. METODOLOGIA: Este estudo transversal foi realizado por meio de questionários com questões abertas e fechadas enviados por e-mail a 165 professores/coordenadores dos programas de graduação em Odontologia do Brasil em 2003/2004. As questões 1, 2 e 3 se referiram à avaliação das Instituições e dos cursos de Odontologia. As questões 5, 6 e 7 se referiram ao ENADE. RESULTADOS: As mudanças com objetivo de melhora na qualidade do ensino em Odontologia e na educação de novos profissionais são impulsionadas pelos resultados do processo de avaliação. Tais mudanças foram implementadas em todas as Instituições de ensino que retornaram os questionários preenchidos. CONCLUSÃO: Mudanças na qualidade da Odontologia brasileira somente serão possíveis se ocorrer melhora no processo educativo de estudantes e professores.

Education, Dental , Education, Higher , Educational Measurement , Brazil , Surveys and Questionnaires
Rev. odonto ciênc ; 26(2): 161-164, 2011. tab
Article in English | LILACS, BBO | ID: lil-611664


PURPOSE: To evaluate the effect of preflaring on the electronic measurement of working length in mesiobuccal roots of maxillary molars. METHODS: Thirty roots were embedded in an alginate model. Root canals were irrigated with 2.5 percent sodium hypochlorite, and a size 10 K file was inserted into the canal until the locator indicated that apical constriction had been reached. Then, the cervical portion of each canal was flared using the ProTaper system shaping files, whereupon electronic measurements were carried out again. RESULTS: The Student's t test for paired samples did not reveal statistically significant differences in the measurements obtained for preflared and unflared canals (P<0.05). CONCLUSION: Based on the lack of clinical significant relevance of the comparisons carried out in the present study, it is possible to conclude that electronic working length measurement can be carried out either before or after cervical preparation.

OBJETIVO: Avaliar o efeito do pré-alargamento sobre a medição eletrônica do comprimento de trabalho em raízes mésio-vestibulares de molares superiores. METODOLOGIA: Trinta raízes foram incluídas em um modelo de alginato. Canais radiculares foram irrigados com hipoclorito de sódio a 2,5 por cento, e uma lima de tamanho 10 K foi inserida no canal até onde o localizador indicou que a constrição apical tinha sido alcançada. A porção cervical de cada canal foi alargada usando as limas do sistema ProTaper, quando então as medições eletrônicas foram realizados novamente. RESULTADOS: O teste t de Student para amostras pareadas não mostrou diferenças estatisticamente significativas nas medições obtidas para canais pré-alargados e não alargados (P<0,05). CONCLUSÃO: Com base na falta de relevância clínica significativa das comparações realizadas no presente estudo, é possível concluir que a medição do comprimento eletrônico de trabalho pode ser realizado antes ou após o preparo cervical.

Humans , Root Canal Preparation/instrumentation , Techniques, Measures, Measurement Equipment