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1.
RFO UPF ; 28(1)20230808. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1511056

ABSTRACT

Introdução: Mesmo com toda evolução tecnológica desses instrumentos, com o desenvolvimento das limas de liga de níquel-titanio (NiTi) e sistemas mecanizados, as fraturas podem ocorrer durante o preparo químico/mecânico. Existem três abordagens mais regulamente aplicadas para solucionar essa intercorrencia: tentativa de remoção do instrumento com ultrassom, tentativa de ultrapassálo (bypass) ou a obturação do segmento. Objetivo: Relatar um caso da técnica de bypass em instrumento fraturado no canal radicular. Descrição do caso: Paciente, sexo feminino, 47 anos, brasileira, sem condições sistêmicas associadas, foi encaminhada à clínica do Curso de Odontologia da UNIFENAS, Divinópolis, Minas Gerais, Brasil, para resolução de fratura de instrumento no canal mésio- vestibular do primeiro molar superior direito (16). Optou-se pelo tratamento pela técnica de bypass, que envolveu as seguintes etapas: anestesia, abertura, utilização de lima C-Pilot #08 para ultrapassar o instrumento fraturado, odontometria, escalonamento regressivo a partir da lima k#20, desinfecção com hipoclorito de sódio 5%, medicação com hidróxido de cálcio por 21 dias, agitação da substância irrigadora e obturação dos canais radiculares. Conclusão: O bypass ao instrumento é uma técnica conservadora, eficaz e uma solução adequada em casos de fratura de limas endodônticas dentro dos canais radiculares. Essa técnica visa preservar o máximo possível da estrutura dental original, evitando procedimentos mais invasivos.(AU)


Introduction: Even with all technological evolution of these instruments, with the development of nickel-titanium alloy (NiTi) files and mechanized systems, fractures can occur during chemical/mechanical preparation. There are three most commonly applie to resolve this complication: attempting to remove the instrument with ultrasound, attempting to bypass it, or obturating the segment. Objective: To report a case of bypass technique in fractured instrument in the root canal. Case description: A 47-year-old female patient from Brazil, with no associated systemic conditions, was referred to the clinic of the Dentistry Course at UNIFENAS, Divinópolis, Minas Gerais, Brazil, for resolution of an instrument fracture in the mesio-vestibular canal of the right upper first molar (16). Treatment was performed using the bypass technique, which involved the following steps: anesthesia, opening, use of a C-Pilot #08 file to bypass the fractured instrument, odontometry, regressive scaling from the k#20 file, disinfection with 5% sodium hypochlorite, medication with calcium hydroxide for 21 days, agitation of the irrigating substance and root canal filling. Conclusion: Instrument bypass is a conservative, effective technique and an adequate solution in cases of endodontic file fracture within root canals. This technique aims to preserve as much of the original tooth structure as possible, avoiding more invasive procedures.(AU)


Subject(s)
Humans , Female , Middle Aged , Root Canal Therapy/instrumentation , Dental Instruments , Dental Pulp Cavity/diagnostic imaging , Equipment Failure , Titanium , Radiography, Dental , Treatment Outcome , Nickel
2.
RFO UPF ; 27(1): 84-98, 08 ago. 2023. tab
Article in Portuguese | LILACS, BBO | ID: biblio-1509386

ABSTRACT

Objetivos: avaliar os processos de coleta, lavagem e esterilização de instrumentais odontológicos, evidenciando se houveram mudanças no processo em função da pandemia de COVID-19, em consultórios odontológicos tanto particulares como públicos, na cidade de Pelotas-RS, visando auxiliar no incremento da segurança e eficácia da esterilização na prática odontológica, após uma crise sanitária global e propor um Procedimento Operacional Padrão (POP). Métodos: os dados foram obtidos em um único momento através de respostas dadas pela aplicação de um questionário para o profissional responsável pelo processo de esterilização de cada local. Os dados foram compilados pelo software Microsoft Excel, foi realizada a análise descritiva e os mesmos foram expressos na forma de porcentagem. Resultados: em 100% dos locais o processo de lavagem e esterilização ocorria na mesma sala de atendimento, destes em quatro locais a operação de transporte era realizada com o auxílio de uma caixa plástica higienizável e seis locais contavam com um processo de pré-lavagem. Todos os locais faziam uso de autoclave para o processo de esterilização, 100% realizavam o monitoramento químico do processo, porém apenas quatro realizavam o monitoramento biológico. Conclusão: houve poucas mudanças nos processos de lavagem e esterilização nos locais pesquisados em razão do surgimento da pandemia de COVID -19. Nenhum local examinado possuía o POP descrito do processo de lavagem e esterilização de instrumentais odontológicos e observou-se um baixo uso dos indicadores biológicos, os quais são considerados o padrão ouro da biossegurança.(AU)


Objectives: to evaluate the processes of collection, washing, and sterilization of dental instruments, highlighting any changes in the process due to the COVID-19 pandemic, in both private and public dental clinics in the city of Pelotas, Rio Grande do Sul, with the aim of enhancing the safety and effectiveness of sterilization in dental practice after a global health crisis, and to propose a Standard Operating Procedure (SOP). Methods: data were collected at a single time point through questionnaire responses provided by the professional responsible for the sterilization process at each location. The data were compiled using Microsoft Excel software, and descriptive analysis was conducted. The results were expressed in the form of percentages. Results: in 100% of the locations, the washing and sterilization process took place in the same treatment room. Out of these, transportation was conducted using a hygienizable plastic box in four locations, and six locations had a pre-washing process. All locations used an autoclave for the sterilization process, and 100% performed chemical monitoring of the process, but only four locations conducted biological monitoring. Conclusion: there were few changes in the washing and sterilization processes at the surveyed locations due to the emergence of the COVID-19 pandemic. None of the examined locations had a described SOP for the washing and sterilization process of dental instruments, and there was a low utilization of biological indicators, which are considered the gold standard for biosafety.(AU)


Subject(s)
Sterilization/methods , Dental Clinics/standards , Dental Instruments/microbiology , Dental Materials , COVID-19/prevention & control , Time Factors , Cross-Sectional Studies , Surveys and Questionnaires , Biological Monitoring
3.
Rev. ADM ; 80(1): 6-10, ene.-feb. 2023. ilus, tab
Article in Spanish | LILACS | ID: biblio-1510346

ABSTRACT

Introducción: el material para empaquetar el instrumental odontológico, como pueden ser bolsas de tela, papel o plástico, es usado por profesionales de la salud; sin embargo, es necesario esclarecer la efectividad de cada uno y determinar el tiempo que permanece estéril luego del procedimiento. Objetivo: identificar la eficacia de tela, plástico y papel como materiales para esterilizar instrumental a corto y largo plazo. Material y métodos: se realizaron cultivos sólidos y líquidos de instrumental esterilizado en tres materiales y con diferentes tiempos de postesterilización. Se incubaron a 36 oC por 72 horas en condiciones aerobias y anaerobias. Los resultados se analizaron usando una prueba de Kruskal-Wallis, seguida de una prueba de Dunn. Resultados: los resultados mostraron que inmediatamente después del proceso de esterilización, los tres materiales son efectivos (Kruskal-Wallis test, p = 0.2752), 24 horas (p = 0.2492), siete (p = 0.0509) y 14 días (p = 0.0006). Veinticuatro horas posterior a la esterilización la tela no es efectiva, el plástico disminuye su efectividad y el papel sigue siendo efectivo. Conclusión: en nuestros resultados, el papel es la mejor opción para esterilizar instrumental (AU)


Introduction: material such as cloth, paper or plastic bags to wrap dental instruments is used by health professionals, however, it is necessary to clarify the effectiveness of each one and determine if it remains sterile after the procedure. Objective: to determine the effectiveness of cloth, plastic and paper as materials to sterilize dental instruments in the short and long term. Material and methods: we carry out solid and liquid cultures of sterilized instruments in three materials, at different post-sterilization times, incubated at 36 oC for 72 hours under aerobic and anaerobic conditions, and the results were analyzed using a Kruskal-Wallis test, followed by from a Dunn's test. Results: our results showed that immediately after the sterilization process the three materials are effective (Kruskal-Wallis; p = 0.2752), 24 hours (p = 0.2492), 7 (p = 0.0509) and 14 (p = 0.0006) days. Twenty-four hours after the cloth is not effective, plastic decreases its effectiveness and paper remain effective. Conclusion: in our results, paper is the best option to sterilize dental instruments (AU)


Subject(s)
Sterilization/methods , Dental Instruments/microbiology , Paper , Plastics , Textiles , Time , Effectiveness , Colony Count, Microbial/methods , Statistics, Nonparametric , Product Packaging/instrumentation , Culture Media
4.
Rev. odontopediatr. latinoam ; 13: 222523, 2023. ilus, tab
Article in Spanish | LILACS, COLNAL | ID: biblio-1428324

ABSTRACT

Objetivo: Comparar, la efectividad clínica y microbiológica, entre las técnicas de eliminación tradicional y químico-mecánicas, para el tratamiento de lesiones cavitadas abiertas no penetrantes en dientes primarios en niños de 4 a 8 años, analizándose 57 dientes primarios. Grupo I: técnica tradicional (19 piezas), Grupo II: Brix (18 piezas), Grupo III: Papacarie (20 piezas). Evaluación clínica (necesidad de anestesiar y tiempo de ejecución) los datos fueron asentados en cada historia clínica. Antes y después del procedimiento operatorio, se tomaron muestras de la cavidad con microbrush estéril, transportándolas en tioglicolato para analizar cuantitativamente el total de bacterias presente por mililitro, utilizando cultivos de agar sangre (base Columbia). La información fue tabulada y analizada estadísticamente mediante Análisis de la Variancia, pruebas de Tukey y de Chi Cuadrado, estableciéndose como criterio de significancia p≤0.05. La diferencia significativa en la cantidad de bacterias entre el grupo I (41.22 ± 4.45) y los grupos II y III (65.96 ± 4.33, 83.45 ± 4.57), reveló que el grupo I fue menos efectivo. En los grupos II y III no se requirió la utilización de anestesia, siendo significativa la diferencia en los niños de edad preescolar (4 y 5 años). El tiempo de ejecución para cada técnica manifestó mayor rapidez en el grupo I (2.12 min ± 0.15) p˂0.0001. Las técnicas que utilizan algún agente químico permiten una mayor eliminación de bacterias durante la remoción de tejido cariado, sin recurrir a anestesia, por lo que pueden ser recomendadas como alternativa al tratamiento tradicional especialmente en niños pequeños.


Objetivo. Este estudo pretende comparar a eficácia clínica e microbiológica de três técnicas para a eliminação do tecido cariado, em crianças dos 4 aos 8 anos. Materiais e Método. Cinquenta e sete dentes decíduos foram analisados. Grupo I: técnica tradicional (19 dentes), Grupo II: Brix (18 dentes), Grupo III: Papacarie (20 dentes). Os dados para avaliação clínica (necessidade de anestesia e tempo de execução) foram registrados em cada anamnese. Antes e após o procedimento operatório, foram retiradas amostras da lesão cariosa com microbrush estéril, transportadas em tioglicolato para análise quantitativa do total de bactérias presentes por mililitro, utilizando culturas de ágar sangue (base Columbia). A informaçâo foi tabulada e analisada estatisticamente por meio do Analize da Varianza, testes de Tukey e do Qui-Quadrado, estabelecendo-se p≤0.05 como critério de significância. Resultados. A diferença na cantidade de bactérias entre o grupo I (41.22 ± 4.45), II e III (65.96 ± 4.33, 83.45 ± 4.57), revelou que o grupo I foi menos eficaz. Os grupos II e III não necessitaram do uso de anestesia, sendo a diferença significativa no grupo de pré-escolares (4 e 5 anos). O tempo de execução de cada técnica foi mais rápido no grupo I (2.12 min ± 0.15) p˂0.0001. Conclusão. As técnicas que utilizam algum agente químico permitem uma maior eliminação de bactérias durante a remoção do tecido cariado, sem recorrer à anestesia, podendo ser recomendadas como alternativa ao tratamento tradicional, especialmente em crianças pequenas.


Aim. This study pretends to compare the clinical and microbiological effectiveness of three techniques for the elimination of carious tissue in children aged 4 to 8 years old. Methods. Fifty-seven primary teeth were analyzed. Group I: traditional technique (19 teeth), Group II: Brix (18 teeth), Group III: Papacarie (20 teeth). The data for clinical evaluation (need for anesthesia and running time) were recorded in each case history. Before and after the operative procedure, samples were taken from the carious lesion with sterile micro brush, transported in thioglycollate to quantitatively analyze the total bacteria present per milliliter, using blood agar cultures (Columbia base). Information was tabulated and statistically analyzed using Analysis of Variance, Tukey's and Chi Square tests, establishing p≤0.05 as the criterion of significance. Results. The difference on number of bacteria between group I (41.22 ± 4.45), and groups II and III (65.96 ± 4.33, 83.45 ± 4.57), revealed that group I was less effective. Groups II and III did not require the use of anesthesia, the difference being significant in the group of pre-school children (4 and 5 years old). The execution time for each technique was faster in group I (2.12 min ± 0.15) p˂0.0001. Conclusions. Techniques that use some chemical agents allow a greater elimination of bacteria during the removal of carious tissue, without resorting to anesthesia, can be recommended as an alternative to traditional treatment especially in young children.


Subject(s)
Humans , Child, Preschool , Child , Chemical Compounds , Dental Caries , Dental Instruments , Surgical Procedures, Operative , Effectiveness , Treatment Outcome
5.
Braz. dent. sci ; 26(2): 1-7, 2023. ilus, tab
Article in English | LILACS, BBO | ID: biblio-1436402

ABSTRACT

Objective: The aim of this study was to evaluate the effect of different glide path files on the amount of apically extruded debris. Material and Methods: Sixty single-canaled mandibular premolars were accessed and randomly divided into three groups (n= 20) according to the file used for glid path creation; group A using Traverse file, group B using WaveOne Gold Glider, group C using stainless steel K file. All teeth were then instrumented using the Reciproc system. The debris extruded apically during instrumentation were collected into pre-weighed Eppendorf tubes which were then stored in an incubator at 70 °C for 5 days. The weight of the dry extruded debris was established by subtracting the pre-instrumentation and post instrumentation weights of the Eppendorf tubes. The data were analyzed using one-way ANOVA test, and post hoc analysis. Results: WaveOne Gold Glider produced the least amount of apical extruded debris (0.41±0.25) followed by the Traverse group (0.59±0.20) then the K-file group (0.64±0.16) with a statistically significant difference (p=0.003). Conclusion: Apical extrusion of debris is inevitable during root canal cleaning and shaping. Creation of glide path using engine-driven files produces less amount of apically extruded debris compared to hand-driven K-files. (AU)


Objetivos: O objetivo deste estudo foi avaliar o efeito de diferentes limas glide path na quantidade de detritos extruídos apicalmente. Metodologia: Sessenta pré-molares inferiores com canal único foram acessados e divididos aleatoriamente em três grupos (n= 20) de acordo com a lima utilizada para criação do glid path; grupo A usando lima Traverse, grupo B usando WaveOne Gold Glider, grupo C usando lima K de aço inoxidável. Todos os dentes foram então instrumentados usando o sistema reciprocante. Os detritos extruídos apicalmente durante a instrumentação foram coletados em tubos Eppendorf pré-pesados que foram então armazenados em uma incubadora a 70°C por 5 dias. O peso dos detritos secos extruídos foi estabelecido subtraindo-se os pesos dos tubos Eppendorf antes e após instrumentação. Os dados foram analisados por meio do teste one-way ANOVA e análise post-hoc. Resultados: WaveOne Gold Glider produziu a menor quantidade de detritos apicais extruídos (0,41±0,25) seguido pelo grupo Traverse (0,59±0,20) e depois pelo grupo K-file (0,64±0,16) com uma diferença estatisticamente significativa (p=0,003). Conclusão: A extrusão apical de detritos é inevitável durante a limpeza e modelagem do canal radicular. A criação do glide path usando limas acionadas por motores produz menos quantidade de detritos extruídos apicalmente em comparação com as limas K manuais. (AU)


Subject(s)
Dental Instruments , Dental Pulp Cavity
6.
Braz. j. oral sci ; 22: e233938, Jan.-Dec. 2023. ilus
Article in English | LILACS, BBO | ID: biblio-1519306

ABSTRACT

The study aimed to find the incidence and awareness of endodontic instrument separation and its management among dental house officers, postgraduate trainees, demonstrators, consultants, and general dentists. Methods: This online questionnaire-based cross-sectional study was conducted with the approval of the IRB in private and public dental hospitals and dental clinics in Punjab. The authors developed the survey tool, which comprises 24 closed-ended items regarding demographics, the incidence of file separation, and awareness about its management. The data were analyzed using IBM SPSS version 24. The Chi-Square Test was used to compare percentages of categorical variables. Results: Postgraduate trainees experienced the most instrument separations (43.6%), made the most retrieval attempts (49.2%), and experienced the most secondary errors during retrieval (52.1%) (p<0.001). Around four out of ten respondents always informed the patients (39.6%) and department (41.6%) about errors. Manual files (69.8%), stainless steel files (75.8%), and short files (60.4%) were more frequently separated, and the most frequent cause was older fatigue files (57.7%). Manual files were more frequently broken in public dental institutes (p=0.003). Two-thirds of the file separations (72.5%) occurred during cleaning and shaping in the apical third of molars (65.1%), especially in mesiolingual canal (56.4%). Bypass attempt was the most common in symptomatic teeth (47.7%). Conclusions: Preventive approaches such as limiting file reuse and constructing a glide path can reduce the occurrence of file separation. Operators should be familiar with the number of uses of the instrument before fatigue and should be trained through workshops and refresher courses


Subject(s)
Humans , Male , Female , Root Canal Preparation/instrumentation , Dental Instruments , Equipment Failure , Endodontists/statistics & numerical data , Pakistan , Root Canal Therapy/instrumentation , Incidence , Cross-Sectional Studies , Surveys and Questionnaires
7.
Pesqui. bras. odontopediatria clín. integr ; 22: e210120, 2022. tab, graf
Article in English | LILACS, BBO | ID: biblio-1422283

ABSTRACT

Abstract Objective: To examine the cyclic fatigue resistance and surface topography of TruNatomy and ProTaper Gold nickel-titanium rotary files and evaluate the presence of alterations to surface topography following instrumentation in simulated curved canals. Material and Methods: Twenty-four nickel-titanium instruments, twelve each of TN and PTG file systems, were evaluated for cyclic fatigue resistance. The rotary files were rotated in a simulated root canal with standardized diameter, angle of curvature, and radius of curvature in a custom-made cyclic fatigue testing device until the instrument fracture occurred. The time to fracture for each instrument was recorded with a stopwatch; in seconds in each group. Fractured instruments were subjected to atomic force microscopy analysis measuring the average roughness and the root mean square values to investigate surface features of endodontic files. Mean values and standard deviation were calculated. Data were analyzed using the Mann-Whitney U test. Results: Time to fracture was marginally higher in PTG instruments than in the TN file systems. PTG files exhibited higher surface roughness when compared with TN files (p<0.05). Conclusion: TN file system had a higher cyclic fatigue resistance than PTG. Cyclic fatigue causing file breakage did affect the surface topography of the files. PTG files showed a higher surface porosity value than the TN files (AU).


Subject(s)
Titanium/chemistry , Microscopy, Atomic Force/instrumentation , Dental Alloys , Dental Instruments , Endodontics , Surface Properties , Statistics, Nonparametric , Dental Pulp Cavity , Hardness Tests , Nickel/chemistry
8.
Rev. odontol. UNESP (Online) ; 51: e20220046, 2022. tab, ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1424236

ABSTRACT

Introdução: É importante saber se o hipoclorito de sódio (NaOCl) influencia a resistência à fadiga cíclica das limas de níquel-titânio (NiTi). Objetivo: Avaliar a influência de NaOCl 2,5% na resistência à fadiga cíclica de dois sistemas de NiTi. Material e método: 40 instrumentos rotatórios - 20 TruNatomy® (TRU, Dentsply Sirona, Maillefer, Ballaigues, Suíça) e 20 Prodesing Logic2® (PDL2, Bassi, Belo Horizonte, Minas Gerais, Brasil) - foram aleatoriamente distribuídos em 4 grupos experimentais (n = 10) imersos em água destilada (H2O) e NaOCl 2,5% em temperatura a 37°C. Foram submetidos a testes de fadiga cíclica mensurando o número de ciclos para fratura (NCF) e análise dessas superfícies pós-teste em microscópio eletrônico por varredura. Para a análise estatística entre os grupos, foi aplicada a análise de variância (ANOVA), complementada com o pós-teste de Tukey. Resultado: Houve diferença estatística em todos os grupos (P<0.05). Os instrumentos PDL2 obtiveram maior resistência à fratura nas condições em H2O e em NaOCl 2,5% comparados aos instrumentos TRU. Na análise de grupos de instrumentos nas soluções de NaOCl e H2O, foi observado que o NaOCl 2,5% diminuiu o NCF. Conclusão: A resistência à fadiga cíclica dos instrumentos TRU e PDL2 diminuiu com NaOCl 2,5%. Os instrumentos PDL2 foram mais resistentes à fratura em relação aos instrumentos TRU.


Introduction: It is important to know whether sodium hypochlorite (NaOCl) influences the cyclic fatigue resistance of nickel-titanium (NiTi) files. Objective: To evaluate the influence of NaOCl 2.5% on the cyclic fatigue resistance of two NiTi systems. Material and method: Forty rotary instruments - 20 TruNatomy® (TRU, Dentsply Sirona, Maillefer, Ballaigues, Switzerland) and 20 Prodesign Logic2® (PDL2, Bassi, Belo Horizonte, Minas Gerais, Brazil) - were distributed randomly across four experimental groups (n=10) and submerged in distilled water (H2O) or 2.5% NaOCl at 37°C according to allocation. Cyclic fatigue testing was then performed, measuring the number of cycles to fracture (NCF), and post-test surfaces were analysed by scanning electron microscopy (SEM). Statistical Analysis: Analysis of variance (ANOVA) was applied for between-group analysis, followed by Tukey's post-hoc test. Result: A significant difference was observed in all groups (P<0.05). PDL2 instruments showed higher fracture resistance under H2O and 2.5% NaOCl conditions compared to TRU. Analysis of all instrument groups showed that exposure to 2.5% NaOCl decreased the NCF compared to H2O. Conclusion: Cyclic fatigue resistance of the TRU and PDL2 instruments was decreased by exposure to 2.5% NaOCl. PDL2 instruments were more resistant to fracture than TRU instruments.


Subject(s)
Sodium Hypochlorite , Titanium , Microscopy, Electron, Scanning , Analysis of Variance , Dental Instruments , Nickel , Thermic Treatment , Corrosion
9.
Braz. dent. sci ; 25(4): 1-8, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1411321

ABSTRACT

Objective: To investigate the effect of room and body temperatures on cyclic fatigue resistance of three endodontic nickel-titanium rotary files: Hyflex EDM (HEDM) (Coltene/Whaledent, Switzerland), WaveOne Gold (WOG) (Dentsply Maillefer, Switzer), and EdgeOne Fire (EOF) (EdgeEndo, Albuquerque, New Mexico, USA) in a double- curved canal. Material and Methods: In this study, Sixty NiTi rotary files were used. These files were divided into three groups (n = 20 for each group). Group A: HEDM (size 25, taper 0.08), group B: WOG (size 25, taper 0.07), and group C: EOF (size 25, taper 0.07). Each group was subdivided into two subgroups (n=10 for each subgroup). One of the subgroup was subjected to cyclic fatigue test at room temperature (20±1°C), while the other subgroup was subjected to cyclic fatigue test at body temperature (37±1°C). These files were tested by using a custom-made artificial canal with a double curvature (coronal curve: 60° curvature with 5 mm radius; apical curve: 70° curvature with 2 mm radius). All instruments were rotated according to the manufacturer instructions until the fracture occurred by using electric endodontic motor (Wave One, Dentsply Maillefer, Ballaigues, Switzerland). The number of cycles to fracture (NCF) and the fractured fragment length (FL) were recorded for each endodontic file. The data were gathered and statistically analyzed using shapiro-wilk test and two-way ANOVA test. The statistical significance was set at 0.05. Results: The NCF of WOG and EOF were significantly lower at body temperature as compared to room temperature (p ≤ 0.05), whereas no difference was observed in NCF of HEDM at body and room temperatures (p>0.05). At 20±1°C, the results showed a non-significant difference between NCF of WOG and EOF (p>0.05), while the NCF of HEDM was significantly lower than the other groups (p ≤ 0.05). At 37±1°C, the results showed a non-significant difference in NCF among the tested endodontic files (p ≤ 0.05). There is non-significant difference in FL of each group at (20±1°C) and (37±1°C) (p>0.05). No statistical difference in FL among the tested files at room and body temperatures (p>0.05). Conclusion: The temperature has a significant effect on cyclic fatigue resistance of EOF and WOG, whereas no effect was observed on cyclic fatigue resistance of HEDM. WOG and EOF had a comparable NCF, while HEDM had a lower NCF than other groups at room temperature. At body temperature, all tested files have a comparable NCF. These results were attributed to the type of the alloy and heat treated that was used to manufacture these endodontic files. The cyclic fatigue test should be done at body temperature (AU)


Objetivo : Investigar o efeito das temperaturas ambiente e corpórea na resistência a fadiga cíclica em três instrumentos endodônticos rotatório de níquel-titânio: Hyflex EDM (HEDM)(coltene/Whaledent, Switzerland), WaveOne Gold (WOG) Dentsply Maillefer, Switzer), e EdgeOne Fire (EOF) (EdgeEndo, Albuquerque, New Mexico, USA) em canais com dupla curvatura. Material e Métodos : Neste estudo foram utilizadas sessenta limas endodônticas rotatórias. Esses grupos foram divididos em três grupos (n=20). Grupo A: HEDM (tamanho 25, conicidade 0.08), grupo B: WOG (tamanho 25, conicidade 0.07), e grupo C: EOF (tamanho 25, conicidade 0.07). Cada grupo foi subdivididos em dois subgrupos (n=10). Um dos subgrupos foi submetido ao teste de fadiga cíclica em temperatura ambiente (20±1°C), enquanto o outro subgrupo foi submetido a ao teste de fadiga cíclica em temperatura corpórea (37±1°C). Essas limas foram testadas em um canal artificial feito sob medida com duas curvaturas (curva coronal: curvatura de 60º e com 5 mm de raio; curva apical: curvatura de 70º com 2mm de raio); Todos os instrumentos foram rotacionados de acordo com a instrução do fabricante até que a fratura ocorresse utilizando um motor endodôntico elétrico (Wave One, Dentsply Maillefer, Ballaigues, Switzerland). O número de ciclos até a fratura (NCF) e a comprimento do fragmento fraturado (FL) foram registrados para cada lima endodôntica. Os dados foram coletados e analisados pelo teste shopiro-wilk e ANOVA two-way. A significância estatística foi 0.05. Resultados: O NCF do WOG e do WOF foi significantemente menor na temperatura corpórea em comparação à temperatura ambiente (p ≤ 0.05), enquanto não foi observada diferença entre NCF em HEDM em temperatura corpórea e temperatura ambiente (p>0.05). Em 20±1°C, os resultados mostraram diferença não significativa entre o NFC com WOG e EOF (p>0.05), enquanto o NCF com HEDM foi significante menor que os demais grupos (p ≤ 0.05). A 37±1°C, os resultados mostraram diferença não significativa em NCF entre as limas endodônticas testadas (p ≤ 0.05). Há diferença não significativa no FL de cada grupo (20±1°C) e (37±1°C) (p>0.05). Não houve diferença estatisticamente diferente no FL entre as limas testadas nas temperaturas ambiente e corporal (p>0,05). Conclusão: A temperatura tem efeito significativo na resistência a fadiga cíclica do EOF e WOG, enquanto não foi observado nenhum efeito na resistência a fadiga cíclica do HEDM. WOG e EOF tiveram um NCF comparável, enquanto HEDM teve um NCF menor do que os outros grupos em temperatura ambiente. À temperatura corporal, todas as limas testas apresentam semelhante NCF. Esses resultados foram atribuídos ao tipo de liga e ao tratamento térmico que foi utilizado na fabricação. O teste de fadiga cíclica deve ser feito à temperatura corporal (AU)


Subject(s)
Body Temperature , Analysis of Variance , Dental Instruments , Fatigue
10.
Pesqui. bras. odontopediatria clín. integr ; 22: e210090, 2022. tab, graf
Article in English | LILACS, BBO | ID: biblio-1386800

ABSTRACT

Abstract Objective: To compare the high-cycle fatigue behavior of four commercially available NiTi orthodontic wires. Material and Methods: Twelve NiTi orthodontic wires, round, 0.016-in, three per brand, were selected and divided into four groups: G1 - Heat-activated NiTi, G2 - Superelastic NiTi, G3 - Therma-Ti, and G4 - CopperNiTi. The atomic absorption spectrometry method was used to determine the chemical composition of investigated NiTi wires. We also performed a fatigue test at three-point bending using a universal testing machine for 1000 cycles in a 35 °C water bath. For the first and thousandth cycle, the average plateau load and the plateau length were determined in the unloading area of the force versus displacement diagram. In addition, we calculated the difference between the average plateau load of the first and thousandth cycle (∆F), as well as the difference between the plateau length of both cases (∆L). Results: According to our results, there were no significant differences between the average plateau load of the first and thousandth cycles of each group (p>0.05) and in the plateau length of the first and thousandth cycles of the groups (p>0.05). Conclusion: There were no significant differences between the groups changing the superelasticity property after high-cycle fatigue.


Subject(s)
Orthodontic Wires , Orthodontics , Stress, Mechanical , Dental Instruments , Spectrophotometry, Atomic/instrumentation , Spectrum Analysis/methods , In Vitro Techniques/methods , Materials Testing , Analysis of Variance
11.
Archives of Orofacial Sciences ; : 85-96, 2022.
Article in English | WPRIM | ID: wpr-964088

ABSTRACT

ABSTRACT@#In the management of periodontitis patients, periodontal risk assessment (PRA) tool is currently being applied during periodontal review (PR). However, an assessment of risk profiles during examination and diagnosis (E&D) may and would effectively assess and diagnose patients’ periodontal conditions, provide personalised treatment planning, and render an enhanced patient care through periodontal management by risk assessment (PEMBRA). From a retrospective study on selected records of 81 patients treated for chronic periodontitis, the PRA profiles of the patients were evaluated during E&D and two to three months after completion of nonsurgical periodontal therapy (NSPT) during PR. The results were analysed using SPSS version 24 for descriptive statistics. On E&D, the patients presented with 25.9% localised and 74.1% generalised chronic periodontitis. Of these, 2.5% of low-risk patients on E&D increased to 21% during PR signifying an improvement after the treatment. However, the medium-risk patients have a slight increase from 32% to 35%, and patients with a high risk of 62% were reduced to 43%. The improvement of the risk profiles for both low and high-risk groups was mostly contributed by the reduction in the plaque score, percentages of bleeding on probing (BOP), and probing pocket depth (PPD) ≥ 5 mm. This evidence-based evaluation of PRA tool during E&D and PR is important for PEMBRA as it encouraged the clinicians to adopt periodontal management through basic periodontal examination, detailed periodontal charting, radiographic interpretation, tooth per tooth prognosis, diagnosis, and targeted NSPT.


Subject(s)
Risk Assessment , Dental Instruments
12.
Chinese Journal of Stomatology ; (12): 384-389, 2022.
Article in Chinese | WPRIM | ID: wpr-935877

ABSTRACT

Objectives: To evaluate the diagnostic consistency of working lengths by observing endodontic files in root canals and periapical subtle structures in digital intraoral radiographs presented in two smartphones, a tablet and a laptop computer. Methods: A dried human skull embedded in an acrylic compound was used for exposing radiographs of the upper and lower second premolars and first molars with two endodontic files (Kerr files size 10 and 15) positioned to the full length of the roots or 1.5 mm short of apexes. A total of 100 radiographs were taken for each of the file sizes. Five observers were asked to assess all the 200 digital radiographs according to a 5-category scale in smartphone A (HUAWEI P9 Plus), smartphjone B (Apple iPhone 7), tablet (Apple iPad 2018) and laptop computer (Lenovo Thinkpad E480), respectively. The gold standard for receiver operating characteristic curve (ROC) analysis was determined with the endodontic Kerr file size 20. A total of 150 roots with files were radiographed, 75 of which with files reaching the radiographic apexes of the respective roots and 75 of which with files 1.5 mm short of the radiographic apexes for each endodontic file size. Results from ROC analysis was analyzed with one-way ANOVA and independent sample t test. Results: For the Kerr file size 10, the area under the ROC curve for laptop, tablet and two smartphones were 0.891±0.037, 0.869±0.037, 0.870±0.017 and 0.849±0.037, while for the Kerr file size 15 the ROC values were 0.957±0.02, 0.961±0.02, 0.961±0.01 and 0.961±0.02, respectively. There were no significant differences for diagnostic accuracy for observing endodontic file positions among digital radiographs presented in the two smartphones, one tablet and one laptop devices (endodontic file size 10: F=1.39, P=0.281; endodontic file size 15: F=0.05, P=0.985). A significant difference was found in the diagnostic accuracy of endodontic file positions between size 10 and 15 files in different display devices (t=-10.65, P<0.001). Conclusions: There was a high diagnostic consistency in the determination of working length and periapical subtle structures of roots by observing digital radiographs displayed on smartphones, tablet and laptop computer.


Subject(s)
Humans , Dental Instruments , Dental Pulp Cavity/diagnostic imaging , Electronics , Molar , Observer Variation , Root Canal Preparation
13.
International Journal of Oral Science ; (4): 12-12, 2022.
Article in English | WPRIM | ID: wpr-929140

ABSTRACT

Various engine-driven NiTi endodontic files have been indispensable and efficient tools in cleaning and shaping of root canals for practitioners. In this review, we introduce the relative terms and conceptions of NiTi file, including crystal phase composition, the design of the cutting part, types of separation. This review also analysis the main improvement and evolution of different generations of engine-driven nickel-titanium instruments in the past 20 years in the geometric design, manufacturing surface treatment such as electropolishing, thermal treatment, metallurgy. And the variety of motion modes of NiTi files to improve resistance to torsional failure were also discussed. Continuous advancements by the designers, provide better balance between shaping efficiency and resistance to of NiTi systems. In clinical practice an appropriate system should be selected based on the anatomy of the root canal, instrument characteristics, and operators' experience.


Subject(s)
Dental Alloys/chemistry , Dental Instruments , Equipment Design , Nickel/chemistry , Root Canal Preparation , Titanium/chemistry
14.
Odovtos (En línea) ; 23(3)dic. 2021.
Article in English | LILACS, SaludCR | ID: biblio-1386564

ABSTRACT

ABSTRACT: The aim of this study was to compare the cyclic fatigue resistance (CFR) of PathFile (Dentsply Sirona, Ballaigues, Switzerland) and ScoutRace (FKG Dentaire, La Chaux-de-Fonds, Switzerland) glide path files which were either new or previously used. Forty PathFile (PF) 19/.02 and 40 ScoutRace (SR) 20/.02 instruments were used for this study. Half of the files in each group were used (PF-U and SR-U) in the 3D demo tooth models (FKG Dentaire, La Chaux-de-Fonds, Switzerland) for creating glide paths, while the other half was new (PF-N and SR-N) and directly subjected to the cyclic fatigue test. The new and used files (n=80) were rotated in the cyclic fatigue test device with an artificial stainless-steel canal (60° curvature, 5 mm radius 1.5 mm width and 3.0 mm depth) under the continuous irrigation with distilled water at 37°C until fracture occurred. Time to fracture was recorded and the Weibull reliability analysis was performed. Data were statistically analysed. Conformity to normal distribution was examined using the Shapiro-Wilk test. A paired two-sample t-test was used to compare the TTF values according to the time within the groups. The new instruments (PF-N and SR-N) showed better CFR than the used groups (PF-U and SR-U) (P SR-N>PF-U>SR-U. Reuse of both glide path instruments reduced the time to fracture and the cyclic fatigue resistance of the files.


RESUMEN: El objetivo de este estudio fue comparar la resistencia a la fatiga cíclica (CFR en inglés) de las limas PathFile (Dentsply Sirona, Ballaigues, Suiza) y ScoutRace (FKG Dentaire, La Chaux-de-Fonds, Suiza) de tipo glide path, nuevas o ya previamente utilizadas. Para este estudio se utilizaron 40 instrumentos PathFile (PF) 19/.02 y 40 ScoutRace (SR) 20/.02. La mitad de las limas de cada grupo se utilizaron (PF-U y SR-U) en los modelos dentales de demostración 3D (FKG Dentaire, La Chaux-de- Fonds, Suiza) para crear trayectorias de deslizamiento, mientras que la otra mitad se utilizaron nuevas directamente a la prueba de fatiga cíclica (PF-N y SR-N). Las limas nuevas y usadas (n=80) se hicieron girar en el dispositivo de prueba de fatiga cíclica con un canal artificial de acero inoxidable (curvatura de 60°, radio de 5mm, anchura de 1,5mm y profundidad de 3,0mm) bajo irrigación continua con agua destilada a 37°C hasta que se produjo la fractura. Se registró el tiempo hasta la fractura y se realizó el análisis de fiabilidad de Weibull. Los datos se analizaron estadísticamente. La conformidad con la distribución normal se examinó mediante la prueba de Shapiro- Wilk. Se utilizó una prueba t de dos muestras pareadas para comparar los valores de TTF según el tiempo dentro de los grupos. Los instrumentos nuevos (PF-N y SR- N) mostraron una mejor CFR que los grupos previamente utilizados (PF-U y SR-U) (p SR-N >PF-U >SR-U. La reutilización de ambos instrumentos tipo glide path redujo el tiempo hasta la fractura y la resistencia a la fatiga cíclica de las limas.


Subject(s)
Equipment Reuse , Dental Instruments
15.
RFO UPF ; 26(2): 206-212, 20210808. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-1443776

ABSTRACT

Objetivos: avaliar a sujidade de limas rotatórias e reciprocantes após instrumentação e procedimentos de limpeza pré-esterilização. Materiais e métodos: 24 limas rotatórias e as 24 limas reciprocantes foram divididas, aleatoriamente, em dois grandes grupos. No primeiro grupo, as 12 limas rotatórias e as 12 limas reciprocantes foram divididas, aleatoriamente, em seis subgrupos (SG): SG1 (controle negativo 1/n=1) ­ 1 lima rotatória não submetida à instrumentação; SG2 (controle negativo 2/n=1) ­ 1 lima reciprocante não submetida à instrumentação; SG3 (controle positivo 1/n=1) ­ 1 lima rotatória submetida à instrumentação e não submetida a qualquer protocolo de limpeza; SG4 (controle positivo 2/n=1) ­ 1 lima reciprocante submetida à instrumentação e não submetida a qualquer protocolo de limpeza; SG5 (grupo teste/n=10) ­ 10 limas rotatórias submetidas à instrumentação e submetidas ao protocolo de lavagem manual; SG6 (grupo teste/ n=10) ­ 10 limas reciprocantes submetidas à instrumentação e submetidas ao protocolo de lavagem manual. No segundo grupo, as 12 limas rotatórias e as 12 limas reciprocantes foram divididas, aleatoriamente, nos mesmos subgrupos, substituindo, nos subgrupos 5 e 6, a lavagem manual pela lavagem em cuba ultrassônica. A análise do nível de sujidade foi realizada por microscopia eletrônica de varredura (MEV), sendo os dados submetidos ao teste de Kruskal-Wallis, com nível de significância de 5%. Resultados: a menor média de sujidade entre os grupos experimentais foi encontrada no SG5 do G1, sem diferença significante em relação aos demais grupos testados (p>0,05). Conclusão: conclui-se que os protocolos de limpeza testados não foram completamente efetivos para a remoção de sujidade das limas endodônticas.(AU)


Objective: to evaluate the dirt of rotary and reciprocating files after instrumentation and pre- -sterilization cleaning procedures. Materials and Methods: 24 rotary files and the 24 reciprocating files were randomly divided into two groups. In the 1st group, 12 rotary files and 12 reciprocating files were randomly divided into six subgroups (SG): SG1 (negative control 1/n=1) ­ 1 rotary file not subjected to instrumentation; SG2 (negative control 2/n=1) ­ 1 reciprocating file not subjected to instrumentation; SG3 (positive control 1/n=1) ­ 1 rotary file submitted to instrumentation and not submitted to any cleaning protocol; SG4 (positive control 2/n=1) ­ 1 reciprocating file submitted to instrumentation and not submitted to any cleaning protocol; SG5 (test group/n=10) ­ 10 rotary files submitted to instrumentation and submitted to the manual cleaning protocol; SG6 (test group/n=10) ­ 10 reciprocating files submitted to instrumentation and submitted to the manual cleaning protocol. In the 2nd group, the 12 rotary files and the 12 reciprocating files were randomly divided into the same subgroups, substituting, in subgroups 5 and 6, manual with ultrasonic bath cleaning. The analysis of dirt levels was performed by scanning electron microscopy (SEM), being the data submitted to the Kruskal-Wallis test, with a significance level of 5%. Results: the lowest average of dirt between the experimental groups was found in SG5 of G1, with no significant difference when compared to the other groups (p>0.05). Conclusion: it could be concluded that the cleaning protocols were not completely effective in removing dirt from endodontic files.(AU)


Subject(s)
Humans , Sterilization/methods , Root Canal Preparation/instrumentation , Dental Instruments , Reference Values , Microscopy, Electron, Scanning , Random Allocation , Equipment Contamination , Statistics, Nonparametric , Root Canal Preparation/methods
16.
Santiago de Chile; Ministerio de Salud; ago 2021.
Non-conventional in Spanish | BIGG, LILACS, MINSALCHILE | ID: biblio-1517428

ABSTRACT

Proveer al equipo de salud odontológico recomendaciones basadas en la mejor evidencia científica disponible, orientada a minimizar el riesgo de transmisión de SARS-CoV-2 durante la atención odontológica generadora de bioaerosoles ambulatoria y de urgencia a nivel primario y secundario de salud: a) Usuarios que reciban atención odontológica generadora de bioaerosoles en toda la Red pública y privada de salud.b) Personal de salud que otorga atención odontológica con procedimientos generadores de bioaerosoles en sistema público o privado de salud. Profesionales de la salud responsables de la atención odontológica generadora de bioaerosoles en centros de salud públicos y privados en todos los niveles de atención y de establecimientos de educación superior. La elaboración de esta Guía de práctica clínica con metodología GRADE, se enmarca en un convenio de colaboración entre la Universidad de La Frontera y el Ministerio de Salud, en el contexto de la pandemia del COVID-19 y los múltiples desafíos en orientar a los equipos clínicos con la evidencia científica disponible al respecto.


Subject(s)
Humans , Dental Care/standards , COVID-19/prevention & control , Respiratory Aerosols and Droplets/virology , Chile , Practice Patterns, Dentists' , Dental Instruments/standards , Personal Protective Equipment
17.
Rev. Asoc. Odontol. Argent ; 109(2): 81-85, ago. 2021. tab, graf
Article in Spanish | LILACS | ID: biblio-1348364

ABSTRACT

Objetivo: Comparar el tiempo empleado por los instrumen- tos TruNatomy Medium y ProTaper Next X3 para penetrar hasta la longitud de trabajo la masa de obturaciones realizadas con Gut- taCore Primary y sellador en conductos curvos simulados. Materiales y métodos: Se prepararon 20 conductos curvos simulados con instrumentos rotatorios WaveOne Gold Primary y se obturaron con GuttaCore Primary y AH Plus. Las muestras fueron divididas en dos grupos de 10 cada uno. Grupo 1: El material de obturación fue penetrado hasta la lon- gitud de trabajo con instrumentos TruNatomy Medium. Gru- po 2: El material de obturación fue penetrado hasta la longitud de trabajo con instrumentos ProTaper Next X3. Se registraron los tiempos de penetración requeridos para cada grupo y los valores obtenidos fueron analizados mediante la prueba t de Student. Resultados: Los instrumentos ProTaper Next X3 pe- netraron la masa del material de obturación más rápidamente que los instrumentos TruNatomy MediumTM. Las diferencias observadas entre ambos instrumentos fueron estadísticamente significativas (P <0.01). Conclusión: Si bien los instrumentos ProTaper Next X3 y TruNatomy MediumTM penetraron la masa de Gutta- Core Primary de manera eficiente, ProTaper Next X3 penetró hasta la longitud de trabajo más rápidamente (AU)


Aim: Compare the time required by the instruments TruNatomy Medium and ProTaper Next X3 to penetrate up to the working length the mass of fillings made with GuttaCore Primary and sealant in simulated curved canals. Materials and methods: The simulated canals of 20 EndoTraining Blocks were prepared with WaveOne Gold Pri- mary and obturated with GuttaCore Primary and AH Plus. The sample was divided into two groups of 10 each. Group 1: The sealing material was penetrated up to working length with TruNatomy Medium. Group 2: The sealing material was penetrated up to working length with ProTaper Next X3. The penetration time was recorded in each group and the obtained values were statistically analyzed with the Student's t test. Results: ProTaper Next X3 instruments penetrated the sealing material mass faster than TruNatomy Medium. Statis- tically significant differences were observed between the two instruments (P <0.01). Conclusion: While the ProTaper Next X3 and TruNat- omy Medium penetrated the GuttaCore mass to the working length efficiently, the ProTaper Next X3 did it in less time (AU)


Subject(s)
Root Canal Filling Materials , Root Canal Preparation/instrumentation , Retreatment , Gutta-Percha , Time Factors , Dental High-Speed Equipment , Dental Instruments , Dental Pulp Cavity/anatomy & histology
18.
Odovtos (En línea) ; 23(2)ago. 2021.
Article in English | LILACS, SaludCR | ID: biblio-1386526

ABSTRACT

ABSTRACT: Fracture of an endodontic file inside a primary root canal is a rare but critical complication during the pulpectomy treatment, because the mechanical obstruction impedes the optimal cleaning and obturation of the pulp canal, compromising seriously the clinical outcome. This accidental event is mainly associated with over-use and excessive torque of intracanal files. Most clinicians opt to proceed with the extraction of the affected tooth followed by a space maintainer placement. Other practitioners attempt the non-surgical retrieval of the separated fragment through available proven techniques in permanent teeth; however, these methods may involve significant damage to the tooth and surround tissues. On the other hand, preservation of the metallic fragment might affect the treatment prognosis and interfere with the physiological root resorption.


RESUMEN: La fractura de una lima endodóntica dentro de un conducto radicular primario es una complicación rara aunque critica durante el tratamiento de pulpectomía, debido a que la obstrucción mecánica impide la limpieza y obturación óptimas del conducto pulpar, comprometiendo seriamente el resultado clínico. Este evento accidental está principalmente asociado con el sobreuso y torque excesivo de las limas dentro del conducto. La mayoría de los clínicos optan por realizar la extracción del diente afectado, seguido por la colocación de un mantenedor de espacio. Otros practicantes intentan la remoción no quirúrgica del fragmento separado a través de técnicas disponibles probadas en dientes permanentes; sin embargo, estos métodos pueden causar daños significativos al diente y tejidos circundantes. Por otra parte, la preservación del fragmento metálico puede afectar el pronóstico del tratamiento e interferir con el proceso de reabsorción radicular fisiológico.


Subject(s)
Periodontics/instrumentation , Root Canal Obturation , Dental Instruments , Pulp Capping and Pulpectomy Agents
19.
Rev. ADM ; 78(3): 176-180, mayo-jun. 2021.
Article in Spanish | LILACS | ID: biblio-1255021

ABSTRACT

La microendodoncia involucra la visualización a través de un microscopio operatorio de todas las fases del tratamiento de conductos y procedimientos de cirugía apical y correctiva por parte del endodoncista. Existe sobrada evidencia acerca de las mejoras que puede aportar la magnificación al tratamiento; la literatura demuestra que la capacidad del operador mejora si su visión del campo gana claridad y precisión, ambos recursos pueden ser proporcionados por el microscopio operatorio, aunado a que posibilita diagnósticos más certeros junto con mejoras en el pronóstico, lo que permite evitar posibles complicaciones. La calidad de los tratamientos endodóncicos involucra infinidad de factores, cada uno relevante en sí mismo pero, en determinados casos, el microscopio puede significar la diferencia entre un tratamiento exitoso o un fracaso clínico. En la actualidad, se ha convertido en un tema de lo más relevante, por lo que el objetivo del presente trabajo es revisar la literatura con el fin de ayudar al entendimiento basado en evidencia científica de los criterios que determinan la relevancia del uso del microscopio en el ámbito endodóncico (AU)


Microendodontics involves the visualization through an operating microscope of all phases of root canal treatment and apical and corrective surgery procedures by the endodontist. There is plenty of evidence about the improvements that magnification can provide, the literature shows that the operator's ability improves if his vision of the field gains clarity and precision, both resources can be provided by the operating microscope, added to the fact that it enables more accurate diagnoses together with improvements in the prognosis allowing to avoid possible complications. The quality of endodontic treatments involves countless factors, each relevant in itself, but in certain cases the microscope can mean the difference between a successful treatment or a clinical failure. At present, it has become a very relevant topic, so the objective of this work is to review the literature in order to help understand the criteria that determine the relevance of the use of the microscope in the endodontic field based on scientific evidence (AU)


Subject(s)
Humans , Root Canal Therapy/trends , Image Enhancement/instrumentation , Microscopy/methods , Periapical Diseases/diagnosis , Prognosis , Treatment Outcome , Dental Instruments , Dental Pulp Diseases/diagnosis
20.
Dent. press endod ; 11(1): 63-71, Jan-Apr2021. Tab, Ilus
Article in English | LILACS | ID: biblio-1348216

ABSTRACT

Objetivo: O objetivo do presente trabalho foi avaliar a resistência à fadiga cíclica e torcional de instrumentos rotatórios de níquel-titânio com secções transversais semelhantes e confeccionados com diferentes tipos de tratamentos térmicos: Hyflex CM (HCM 25/.06), Vortex Blue (VB 25/.06), Sequence Rotary File (SRF 25/.06) e EdgeSequel (EDF 25/.06) (n=20). Métodos: O teste de fadiga cíclica avaliou o tempo e o número de ciclos para a fratura (NCF) dos instrumentos em canal artificial com 60° de curvatura e 5mm de raio (n=10). O teste de torção avaliou o torque máximo e a deflexão angular para a fratura dos 3mm da ponta dos instrumentos (n=10). Após o teste de torção e de fadiga cíclica, os instrumentos foram avaliados em microscopia eletrônica de varredura (MEV) (n=10). Os dados foram analisados empregando-se os testes ANOVA e de Tukey, sendo selecionado um nível de significância de 5%. Resultados: HCM apresentou o maior tempo e NCF entre todos os instrumentos avaliados (p<0,05). O SRF apresentou um tempo semelhante (p>0,05) e menor NCF (p<0,05) do que o VB. Em relação ao teste torcional, o HCM apresentou menor valor de torque e maior deflexão angular entre os grupos avaliados (p<0,05). Não houve diferenças significativas entre VB, SRF e EDF em relação à deflexão angular (p>0,05). Conclusão: O HCM apresentou maior resistência à fadiga cíclica e deflexão angular. Entretanto, o VB apresentou maior resistência torcional para a fratura (AU).


Objective: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of Nickel-Titanium rotary instruments with similar cross-sectional design and manufactured by different thermal treatments: Hyflex CM (HCM 25/.06) Vortex Blue (VB 25/.06), Sequence Rotary File (SRF 25/.06) and EdgeSequel (EDF 25/.06) (n=20). Material and Methods: Cyclic fatigue test evaluated the time and number of cycles to failure (NCF) in an artificial stainless steel canal with 60° and 5-mm radius of curvature (n=10). The torsional test (ISO 3630-1) evaluated he maximum torque and distortion angle to failure at 3 mm from the tip (n=10). After the torsional and cyclic fatigue test the instruments were evaluated by scanning electron microscope (SEM). Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%. Results: The HCM presented the longest time and highest NCF to fatigue than all the groups (P<0.05). The SRF presented similar time (P>0.05) and lower NCF (P<0.05) to fatigue than VB. Regarding to the torsional test, HCM presented the lowest torque load and the highest distortion angle of all the groups (P<0.05). No significant difference was found among VB, SRF and EDF regarding the distortion angle (P>0.05). Conclusion: The HCM presented the highest cyclic fatigue resistance and distortion angle to failure. However, the VB showed higher torsional load to failure. (AU).


Subject(s)
Microscopy, Electron, Scanning , Torque , Dental Instruments , Endodontics , Titanium , Analysis of Variance , Fatigue , Nickel
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