Clinical longevity of metallic versus fiberglass intraradicular posts: a systematic review / Longevidade clínica de pinos intraradiculares metálicos versus de fibra de vidro: uma revisão sistemática

Objective: This systematic review aims to compare the clinical longevity of metallic and fiberglass intraradicular posts in teeth with severely compromised crowns, utilizing randomized clinical trials and case reports published in the last eleven years. Material and Methods: The research was conducted on PubMed, Medline, Lilacs, and BBO databases using the first search strategy with the descriptors 'dental posts,' 'longevity,' 'fiberglass-reinforced posts' or 'metallic posts.' The second search strategy involved analyzing the references of articles identified by the first search. Both studies were carried out with stringent inclusion and exclusion criteria. Results: No statistically significant and clinically relevant differences in longevity were observed between metallic and fiberglass posts. Conclusion: The clinical success and durability of the restorative procedure using intraradicular posts primarily depend on the remaining amount around the post (ferrule), the type and position of the tooth in the arch (impacting the masticatory forces exerted on the restored tooth), and the correct application of the cementation technique. It is noteworthy that fiberglass posts offer substantial advantages by presenting a modulus of elasticity similar to dental structure, ensuring a more homogeneous distribution of masticatory forces and reducing the risk of fractures. These findings have practical implications for material selection in restorative procedures involving intraradicular posts.(AU)

Objetivo: Esta revisão sistemática visa comparar a longevidade clínica de pinos intrarradiculares metálicos e de fibra de vidro em dentes com coroas severamente comprometidas, através de estudos clínicos randomizados e relatos de casos, publicados nos últimos onze anos. Material e Métodos: A pesquisa foi conduzida nas bases de dados PubMed, Medline, Lilacs e BBO, utilizando a primeira estratégia de busca com os s 'pinos dentais' e 'longevidade' e 'pinos reforçados com fibra de vidro' ou 'pinos metálicos'. A segunda estratégia de busca consistiu na análise das referências dos artigos identificados pela primeira estratégia. Ambos os estudos foram delineados com critérios rigorosos de inclusão e exclusão. Resultados: Não se constataram diferenças estatisticamente significativas e clinicamente relevantes na longevidade entre pinos metálicos e de fibra de vidro. Conclusão: O êxito clínico e a durabilidade do procedimento restaurador empregando pinos intrarradiculares dependem primordialmente da quantidade de remanescente ao redor do pino (férula), do tipo e posição do dente na arcada (o que impacta nas forças mastigatórias exercidas sobre o dente restaurado) e da aplicação correta da técnica de cimentação.Destaca-se que o pino de fibra de vidro oferece vantagens substanciais ao apresentar módulo de elasticidade similar à estrutura dentária, assegurando uma distribuição mais homogênea das forças mastigatórias e reduzindo o risco de fraturas (AU)

Reabilitação estética e funcional com resina composta após trauma dentário: relato de caso / Aesthetic and functional rehabilitation with composite resin after dental trauma: case report

As lesões dentárias traumáticas são um problema de saúde pública mundial, dentre as quais a fratura dentária é a de maior ocorrência, envolvendo principalmente os dentes anteriores. A abordagem de grandes fraturas anteriores é um desafio para cirurgiões dentistas de qualquer nível pois, além da função, afetam diretamente a estética do paciente, fazendo-se necessário um planejamento que envolva diferentes especialidades na odontologia. Objetivo: Relatar um caso clínico de reabilitação funcional e estética de fratura dentária nos incisivos centrais superiores envolvendo tratamento endodôntico, instalação de pino de fibra de vidro e restauração direta em resina composta. Relato de Caso: O paciente de 17 anos sofreu fratura nos incisivos centrais superiores causada por uma queda de bicicleta. Devido à busca tardia por tratamento o elemento 21 foi diagnosticado com necrose pulpar e, portanto, foi submetido à tratamento endodôntico pela Técnica Crown Down e reabilitação com pino de fibra de vidro Splendor-SAP. Posteriormente, os elementos 11 e 21 foram restaurados com facetas diretas em resina composta pela técnica incremental. Conclusão: A reabilitação com instalação de pino de fibra de vidro associada à técnica de estratificação incremental em resina composta se mostra como uma boa opção para reabilitação estética pois permite dar forma anatômica ao dente com riqueza de detalhes na estratificação da dentina e esmalte, além de máxima preservação da estrutura dental. Os resultados obtidos reforçam o sucesso estético e funcional com significativo impacto na qualidade de vida do paciente(AU)

Traumatic dental injuries are a worldwide public health problem, among which dental fractures are the most frequent, mainly involving the anterior teeth. The approach of large anterior fractures is a challenge for dental surgeons of any level because, in addition to function, they directly affect the patient's esthetics, requiring a plan that involves different specialties in dentistry. Objective: Report a clinical case of functional and aesthetic rehabilitation of dental fractures in maxillary central incisors involving endodontic treatment, installation of a fiberglass post and direct restoration in composite resin. Case Report: The 17-year-old patient suffered a fracture in the upper central incisors caused by a fall from a bicycle. Due to the late search for treatment, element 21 was diagnosed with pulp necrosis and, therefore, underwent endodontic treatment using the Crown Down Technique and rehabilitation with a Splendor-SAP fiberglass pin. Later, elements 11 and 21 were restored with direct veneers in composite resin using the incremental technique. Conclusion: Rehabilitation with the installation of a fiberglass post associated with the incremental layering technique in composite resin is a good option for aesthetic rehabilitation as it allows the anatomical shape of the tooth with rich details in the layering of dentin and enamel, in addition to maximum preservation of the tooth structure. The results obtained reinforce the aesthetic and functional success with a significant impact on the patient's quality of life(AU)

The use of serial casting in the treatment of children with cerebral palsy: a study protocol

Introduction: Cerebral Palsy (CP) is characterized by a disorder of posture and movement, commonly leading to disabling orthopedic alterations, including muscle shortening, especially in the lower limbs. Stretching methods, performed gradually, are necessary to delay the impairment in function from muscle shortening. The use of serial casting aims to promote proper alignment, and an ideal and stable support base, in addition to better bone and joint health, leading to better posture, mobility, muscle function, and, subsequently, increased fitness and health.Objective: evaluate range of motion, postural control, and motor performance in children with CP, using serial casting, as well as to measure its effect on fitness through the autonomic nervous system (ANS).Methods: Sixty children and adolescents with CP, of both sexes, 3 to 12 years of age, will be divided into three groups: Groups A, B, and C, with 20 individuals each. Group A will use serial casting, Group B will use the orthosis continuously (with removal only allowed for bathing), and Group C will use the orthosis in their daily routine. Range of motion of the ankle of first and second resistance levels (R1 and R2), gross motor function measure (GMFM), and balance (measured by BERG scale) will be used in the initial and final assessments, and after 6 months and one year of follow-up. Timed-up-and-go (TUG), load distribution (baropodometry), motor performance measured through a real basketball game and the virtual MoveHero game, analysis of body angulation with "mydartfish", and cardiac autonomic modulation through heart rate variability will be assessed in three different situations: barefoot, with orthosis, and with casting.Conclusion: Serial casting demonstrates the potential to produce positive results in the treatment of individuals with CP regarding better alignment, with consequent motor and autonomic improvement.

Fiberglass versus cast metal posts: a practical review based on mechanical properties / Pinos de fibra de vidro versus metal fundido: uma revisão prática baseada em propriedades mecânicas

The current review aimed to compare the mechanical properties and clinical behavior of fiberglass and cast metal posts. It included in-vitro studies, finite element analysis, clinical studies, and systematic reviews that evaluated fiberglass and metal posts with reliable methodologies. The reports in the literature diverge on tooth failure modes and stress distributions in the root according to different posts. Investigations suggest that fiberglass posts are preferable because their elastic modulus is similar to dentin. Other studies mention that the flexibility of fiber posts may damage the interface. The fracture load values of different studies could not be compared. The presence of a ferrule seems beneficial. Cast metal posts provide higher characteristic strength to the set but with more unfavorable failures. Intraradicular posts with a lower elastic modulus produce more stress between the cement layer and dentin. In conclusion, fiberglass and cast metal posts can be used with a ferrule. Cast metal posts seem more appropriate for weakened teeth. The presence of a ferrule benefits the system. Weakened teeth tolerate higher loads when restored with cast metal posts, but when these posts fail, the only solution is tooth extraction. Clinical follow-ups cannot yet detect differences between the survival rates of intraradicular fiberglass and cast metal posts (AU)

O objetivo da presente revisão foi comparar as propriedades mecânicas e o comportamento clínico de pinos de fibra de vidro e núcleos metálicos fundidos. Estudos laboratoriais, analise por elementos finitos, estudos clínicos e revisões sistemáticas que avaliaram pinos de fibra de vidro e metálicos, com metodologia confiável foram selecionados. A literatura mostra-se bastante controversa sobre os modos de falha do dente e a distribuição de tensões na raiz de acordo com diferentes tipos de pinos. Algumas investigações sugerem que pinos de fibra de vidro são preferíveis porque seu módulo de elasticidade é semelhante ao da dentina, enquanto outras mencionam que a flexibilidade do pino de fibra pode ser prejudicial à interface adesiva. Os valores de carga de fratura em diferentes estudos não podem ser comparados. A presença de férula é benéfica. O núcleo metálico fundido resulta em maior resistência característica do conjunto, mas falhas mais desfavoráveis. Também, pinos com menor módulo geram mais tensão entre a camada de cimento e a dentina. Em conclusão, verificou-se que tanto pino de fibra de vidro como núcleo metálico fundido podem ser utilizados quando a férula está presente. Os núcleos metálicos fundidos parecem ser mais indicados para dentes fragilizados. É evidente que a presença de férula é benéfica para o sistema. Dentes fragilizados toleram cargas maiores quando restaurados com núcleos metálicos fundidos; porém, quando falham, a única solução é a extração do dente. Os acompanhamentos clínicos ainda não são capazes de detectar diferença entre as taxas de sobrevivência dos pinos de fibra de vidro e núcleos metálicos (AU)

Resistencia a la fuerza de tracción de espigos de fibra de vidrio y anatomizados / Tensile bond strength of fiberglass and anatomized posts

Introducción: Es frecuente el desprendimiento de los espigos de fibra de vidrio por pérdida de adhesión cuando son sometidos a las fuerzas masticatorias. Objetivo: Comparar in vitro la resistencia a las fuerzas de tracción de espigos de fibra de vidrio y anatomizado con un mismo cemento. Métodos: Estudio in vitro, de tipo experimental. Se seleccionaron 20 premolares extraídos por motivos ortodónticos que fueron distribuidos aleatoriamente en dos grupos. Se les realizó el tratamiento de conductos por un especialista, la preparación fue manual y la técnica de obturación por condensación lateral. Los dientes fueron preparados para, en forma estándar, recibir el espigo de fibra de vidrio y anatomizados con resina. Para ambos grupos la cementación siguió el protocolo sugerido por el fabricante de Allcem Core® (cemento dual). Los especímenes fueron troquelados en acrílico de autocurado. Para luego ser sometido a fuerza de tracción vertical en la máquina de pruebas de materiales (Instrom©). Resultados: En el grupo de dientes con espigos anatomizados se obtuvo una media de 31 Kg/F, postes de fibra de vidrio 12,47 Kg/F. Según las pruebas de Shapiro-Wilk, las muestras presentaron distribución normal (p > 0,05). Se contrastó la hipótesis con la prueba de t de Student y se encontró diferencia estadística altamente significativas entre los grupos (p = 0,001) Conclusiones: Existe una mayor resistencia a la tracción vertical en los espigos anatomizados(AU)

Introduction: Fiberglass posts often fall off their position due to loss of adhesive capacity when they are subjected to masticatory force. Objective: Compare in vitro the tensile bond strength of fiberglass and anatomized posts cemented with the same adhesive material. Methods: An in vitro experimental study was conducted. A selection was made of 20 premolars extracted by orthodontic indication which were then randomly distributed into two groups. The premolars underwent root canal treatment by a specialist. The preparation was manual and sealing was performed by lateral condensation. The teeth were prepared in the standard manner to receive the fiberglass and resin-anatomized posts. In both groups' cementation followed the protocol suggested by the manufacturer of Allcem Core® (dual cement). The specimens were stamped in self-curing acrylic. Next, they were subjected to vertical tensile strength in an materials testing machine (Instrom©). Results: The mean values obtained were 31 kg/F for teeth with anatomized posts and 12.47 kg/F for fiberglass posts. According to Shapiro-Wilk tests, the samples exhibited a normal distribution (p > 0.05). The hypothesis was contrasted with Student's t test, obtaining a highly significant statistical difference between the groups (p = 0.001). Conclusions: Vertical tensile bond strength is greater in anatomized posts(AU)

Guided Endodontics in Root Canals with Complex Access: Two Case Reports

Abstract This article reported two clinical cases in which the guided endodontics was used to perform the access to the root canals. The first case presents a 40-year-old female with a history of pain related to the left maxillary canine. After radiographic examination, the presence of severe calcification up to the apical third of the root canal, associated with a periapical radiolucency, was noted. In the second case, an 85-year-old male was referred to our service with pain upon palpation, at the right mandibular first molar. The radiographic images revealed the presence of endodontic treatment and a fiberglass post in the distal root canal, which was associated with extrusion of the filling material and a periapical lesion. The 3D-guides were planned based on cone beam computed tomography and intraoral digital scanning, which were aligned using a specific software. Therefore, implant drills could be guided up to the root canal length required for each case. In the first case, a surgical root canal was created and the patient was free of signs and symptoms after the treatment was completed. In the second case, it was observed that the fiber post was worn by the drill, allowing free access to the filling material. It was possible to perform the endodontic reintervention in a more predictable way and in less time. In both cases, the use of the guided endodontics allowed the preservation of a large part of the dental structure. The procedures were performed faster, without the occurrence of fractures and perforations.

Resumo Este artigo relatou dois casos clínicos em que a endodontia guiada foi utilizada para realizar o acesso aos canais radiculares. O primeiro caso apresenta uma mulher de 40 anos com história de dor relacionada ao canino superior esquerdo. Após exame radiográfico, notou-se a presença de calcificação acentuada até o terço apical do canal radicular, associada a radioluscência periapical. No segundo caso, um homem de 85 anos foi encaminhado ao nosso serviço com dor à palpação no primeiro molar inferior direito. As imagens radiográficas revelaram a presença de tratamento endodôntico e pino de fibra de vidro no canal radicular distal, que estava associado à extrusão do material obturador e lesão periapical. Os guias-3D foram planejados com base em tomografia computadorizada de feixe cônico e escaneamento intraoral digital, os quais foram alinhados por meio de um software específico. Desta forma, brocas de implante puderam ser guiadas até o comprimento necessário do canal radicular para cada caso. No primeiro caso, foi confeccionado um canal radicular cirúrgico e o paciente ficou sem sinais e sintomas após o término do tratamento. No segundo caso, observou-se que o pino de fibra foi desgastado pela broca, permitindo o livre acesso ao material obturador. Foi possível realizar a reintervenção endodôntica de forma mais previsível e em menos tempo. Em ambos os casos, o uso da endodôntica guiada permitiu a preservação de grande parte da estrutura dentária. Os procedimentos foram realizados com maior agilidade, sem a ocorrência de fraturas e perfurações.

Esthetic rehabilitation with indirect resin on anterior teeth: a clinical report / Reabilitação estética com resina indireta em dentes anteriores: um relato clínico / Rehabilitaciónestética con resina indirecta en dientes anteriores: reporte clínico

Introduction:The aesthetic rehabilitation of endodontically treated teeth depends on the destruction degree of the crown, the bone support, type of prosthesis, andchewing forces. In these cases, indirect restorations with composite resins are an excellent alternative. The indirect composite resins have improved physical and mechanical properties due toincorporatingof inorganic fillersand multifunctional monomers. These components offer a greater bonding strength to the indirect restorations, which is advantageous for further rehabilitations with ceramic crowns. Objective:To present an aesthetic rehabilitation of anterior teeth with indirect composite resin as a feasible and less expensive treatment alternative.Case Report:Upon clinical examination, extensive and deficient restorations were observed in the upper anterior teeth. The proposed treatment plan was the aesthetic rehabilitation of endodontically treated teeth with indirect restorations using ceromer.Conclusions:This treatment represented an excellent alternative for aesthetic rehabilitation of endodontically treated teeth in cases of great dental crown destruction or small dental absences (AU).

Introdução:A reabilitação estética de dentes tratados endodonticamente depende do grau de destruição da coroa, do dente em questão, do suporte ósseo, do tipo de prótese e dos tipos de forças a que esses dentes serão submetidos. As resinas compostas indiretas apresentam propriedades físicas e mecânicas aprimoradas graças à incorporação de componentes inorgânicos e monômeros multifuncionais com maior número de pontos de união, tornando-os capazes de solucionar os problemas em que seriam indicadas restaurações cerâmicas. Objetivo:Apresentar um relato de caso clínico de uma reabilitação estética de dentes anteriores com resina composta indireta como alternativa de tratamento viável e de menor custo.Relato de Caso:Ao exame clínico foram observadas restaurações amplas e deficientes nos dentes anteriores superiores. O plano de tratamento proposto reabilitação estética dos elementos dentários com cerômeros.Conclusões:Este tratamento representou uma opção viável e demenor custo que pode ser utilizado tanto em situações de grande destruição dentária como em pequenas ausências dentárias, em substituição às restaurações de cerâmica (AU).

Introducción: La rehabilitación estética de los dientes tratados endodónticamente depende del grado de destrucción de la corona, el diente en cuestión, el soporte óseo, el tipo de prótesis y los tipos de fuerzas a las que estos dientes serán sometidos. Las resinas compuestas indirectas tienen propiedades físicas y mecánicas mejoradas gracias a la incorporación de componentes inorgánicos y monómeros multifuncionales con mayor número de puntos de unión, lo que las hace capaces de resolver los problemas en los que estarían indicadas las restauraciones cerámicas. Objetivo: Presentar un caso clínico de rehabilitación estética de dientes anteriores con resina compuesta indirecta como alternativa de tratamiento viable y menos costosa. Reporte de Caso:En el examen clínico, se observaron restauraciones extensas y deficientes en los dientes anteriores superiores. El plan de tratamiento propuesto para la rehabilitación estética de elementos dentales con cerómeros. Conclusiones:Este tratamiento representó una opción viable y menos costosa que se puede utilizar tanto en situaciones de gran destrucción dentaria como en pequeñas ausencias dentales, en sustitución de las restauraciones cerámicas (AU).

Techniques for removing root canal posts: an vitro study / Técnicas para remoção de pinos intrarradiculares: um estudo in vitro

Objetivo: O objetivo deste estudo foi responder qual é a melhor técnica para remoção de pinos de fibra de vidro e pinos metálicos fundidos considerando tempo, preservação da estrutura dentária e custos. Métodos: Foi realizado um estudo in vitro, randomizado e cego. Sessenta dentes tratados endodonticamente foram randomizados em dois grupos de acordo com o tipo de pino. Uma segunda randomização foi realizada para cada tipo de técnica de remoção (ultrassom, broca ou combinada; n=10). One-way ANOVA foi usado para comparar o tempo de remoção do pino, teste t pareado comparou a quantidade de estrutura dentária removida e Kruskal Wallis seguido pelo teste post hoc de Mann-Whitney foram usados para análise de custo (P = 0,05). Resultados: Não houve diferença no tempo de remoção do pino considerando o tipo ou técnica do pino (P=0,630). A perda média de estrutura dentária na região cervical foi superior a 30% quando apenas uma ponta diamantada foi usada para remover pino de fibra de vidro (P<0,00001) e pino metálico fundido (P=0,008). Conclusão: De acordo com os resultados deste estudo, podemos concluir que a seleção da técnica de remoção dependerá da habilidade do operador, e sempre ocorrerá alguma perda de estrutura dentária, embora seja esperada uma perda maior quando apenas pontas diamantadas são usadas para este fim.(AU)

Objective: The aim of this study was to answer which is the best technique to removing glass fiber post and cast metal post considering time, preservation of tooth structure, and costs. Methods: An in vitro, randomized, blinded study was conducted. Sixty endodontically treated teeth were randomized into two groups according to post type. A second randomization was performed for each type of removal technique (ultrasound, drill, or combined; n=10). One-way ANOVA was used to compare the time to post removal, paired t-test compared the amount of tooth structure removed and Kruskal Wallis followed by post hoc Mann-Whitney test were used for cost analysis (P=0.05). Results: There was no difference in post removal time considering post type or technique (P=0.630). The average loss of tooth structure in the cervical region was greater than 30% when only a diamond bur was used to remove fiber glass post (P<0.00001) and cast metal post (P=0.008). Conclusion: According to the results of this study, we can conclude that the selection of the removal technique will depend on the skill of the operator, and some loss of tooth structure will always occur, although greater loss is expected when only diamond burs are used for this purpose.(AU)

Caries temprana de la infancia: rehabilitación estética, funcional e integral en paciente preescolar. Caso clínico / Early childhood caries: esthetic, functional and comprehensive rehabilitation in preschool patient. A clinical case

La American Academy of Pediatric Dentistry (2020) define a la caries temprana de la infancia (CTI) como una forma severa de caries de etiología multifactorial que compromete la dentición primaria de niños pre-escolares. Afecta principalmente a los incisivos primarios superiores seguidos de los primeros molares primarios, pudiendo promover el desarrollo de hábitos parafuncionales, reducción de la eficacia masticatoria, pérdida de la dimensión vertical, alteraciones en la fonación y defectos estéticos que causan repercusiones emocionales e impacto psicosocial. La insuficiente cantidad y calidad de estructura coronaria remanente, luego de la eliminación del tejido cariado, puede comprometer la adhesión de los materiales de restauración. El objetivo de este trabajo es presentar la atención y el seguimiento a dos años de un paciente preescolar que presenta CTI, que concurrió para su atención a la Cátedra de Odontología Integral Niños de la Facultad de Odontología de la Universidad de Buenos Aires (AU)

Influence of sonic vibration and cement type on the bond strength of fiberglass posts after aging / Influencia de la vibración sónica y el tipo de cemento en la fuerza de unión de los postes de fibra de vidrio después del envejecimiento

Introduction: This study evaluated the influence of sonic vibration and thermocycling on the bond strength of fiberglass posts using conventional dual-cured and self-adhesive resin cements. Material and Methods: Ninety-six single-rooted endodontically treated teeth were divided randomly into eight groups according to the cement used (dual-cured or self-adhesive resin cement), use of sonic vibration during post accommodation, and aging conditions (24h in distilled water or 5,000 thermal cycles). The fiberglass posts (White Post DC1, FGM) were cleaned with alcohol, treated with silane and cemented with dual-cured (Allcem Core, FGM) or with self-adhesive resin cement (seT, SDI). For groups in which sonic vibration was used, the posts were accommodated, and sonic vibration was applied for 10 s using a special tip placed on top of the post (Sonic Smart Device, FGM). Pull-out tests were performed after storage in distilled water for 24h at 37°C or after thermocycling (5000 cycles, at 5°C and 55°C). The results were evaluated using three-way ANOVA and Tukey's test (α=0.05). Results: Significant differences were not observed between the bond strengths of dual-cured (87.93±41.81 N) and self-adhesive cement (82.53±41.43 N). Bond strength for the sonic vibration groups (100.36±42.35 N) was significantly higher than for groups without sonic vibration (70.13±34.90 N). There were significant differences between specimens subjected to thermocycling (98.33±39.42 N) and those stored for 24h in distilled water (72.16±39.67 N). Conclusion: It can be concluded that both sonic vibration and thermocycling significantly improved bond strength of fiberglass posts with the two evaluated resin cements.

Introducción: Este estudio evaluó la influencia de la vibración sónica y el termociclado en la fuerza de unión de los postes de fibra de vidrio utilizando cementos de resina autoadhesivos y de curado dual convencionales Material y Métodos: Se dividieron aleatoriamente noventa y seis dientes tratados endodónticamente de raíz única en ocho grupos según el cemento utilizado (cemento de resina de curado dual o autoadhesivo), el uso de vibración sónica durante la acomodación posterior y las condiciones de envejecimiento (24 horas agua destilada o 5.000 ciclos térmicos). Los postes de fibra de vidrio (White Post DC1, FGM) se limpiaron con alcohol, se trataron con silano y se cementaron con cemento de curado dual (Allcem Core, FGM) o con cemento de resina autoadhesivo (seT, SDI). Para los grupos en los que se utilizó vibración sónica, se acomodaron los postes y se aplicó la vibración sónica durante 10 s utilizando una punta especial colocada en la parte superior del poste (Sonic Smart Device, FGM). Las pruebas de extracción se realizaron después del almacenamiento en agua destilada durante 24 horas a 37ºC o después del termociclado (5000 ciclos, a 5ºC y 55ºC). Los resultados se evaluaron mediante ANOVA de tres vías y la prueba de Tukey (α = 0.05). Resultados: No se observaron diferencias significativas entre las resistencias de adhesión del cemento de curado dual (87,93 ± 41,81 N) y el cemento autoadhesivo (82,53 ± 41,43 N). La fuerza de unión para los grupos de vibración sónica (100,36 ± 42,35 N) fue significativamente mayor que para los grupos sin vibración sónica (70,13 ± 34,90 N). Hubo diferencias significativas entre los especímenes sometidos a termociclado (98,33 ± 39,42 N) y los almacenados durante 24 h en agua destilada (72,16 ± 39,67 N). Conclusión: Se puede concluir que tanto la vibración sónica como el termociclado mejoraron significativamente la fuerza de unión de los postes de fibra de vidrio con los dos cementos de resina evaluados.

A Fiberglass and Resin Post Technique Combined with Fragment Collage of an Upper Central Incisor: Multidisciplinary Treatment / Unión de fragmento de un incisivo central superior con una técnica combinada: Tratamiento multidisciplinario

ABSTRACT: The clinical treatment of anterior tooth fractures requires specialized knowledge, technical skill, and a degree of artistic sense to ensure successful treatment. Herein, we describe the reattachment of an original tooth fragment with endodontic involvement via the utilization of a micro-hybrid composite resin and an aesthetic fiberglass post.

RESUMEN El tratamiento clínico de las fracturas coronarias en dientes anteriores superiores requiere de conocimientos especializados, habilidades técnicas y un grado de sentido artístico para garantizar un exitoso tratamiento. En este reporte de caso, se describe la unión de un fragmento de un incisivo superior, que requirió previamente un tratamiento endodóntico, mediante la utilización de una resina compuesta micro- híbrida y un poste de fibra de vidrio.

Effects of denture cleansers on denture material properties ­an observational case­control study / Efectos de los limpiadores de prótesis dentales sobre las propiedades del material: un estudio observacional de casos y controles

Everyday use of denture cleansers to prevent microbial colonization on dentures can affect the properties of the denture base material. Limited literature is available on the effects of denture cleanser on reinforced resins. This study aimed to evaluate and compare the effect of denture cleanser on the flexural and impact strength of conventional and reinforced heat cure acrylic resins. Materials and Methods: Rectangular shaped specimens were prepared for flexural and impact strength as per ISO 1567. The denture base resins used included conventional, high impact, nylon fiber reinforced and glass fiber reinforced heat cure acrylic resins. They were further categorized into subgroups A and B depending on immersion in distilled water or denture cleanser (3.8% sodium perborate based). The flexural strength and impact strength of specimens were measured. The study design is a observational case-control study. SPSS version 25 statistical analysis software was used, and the STROBE statement checklist was followed. Results: The mean flexural strength was highest for glass fiber reinforced heat cure resin followed by conventional heat cure resin, high impact heat cure resin and nylon reinforced heat cure resin, respectively. The mean impact strength was highest for high impact heat cure resin followed by glass fiber reinforced heat cure resin, conventional heat cure resin, and nylon fiber-reinforced resin respectively.Conclusion: All the denture base resins tested exhibited a decrease in flexural and impact strength following use of a denture cleanser.

El uso diario de limpiadores para prótesis dentales para prevenir la colonización microbiana en las prótesis puede afectar las propiedades del material base de estas. Existe literatura limitada sobre los efectos de los limpiadores de prótesis sobre resinas reforzadas. Este estudio tuvo como objetivo evaluar y comparar el efecto de un limpiador de prótesis sobre la resistencia a la flexión y al impacto de las resinas acrílicas de curado con calor convencionales y reforzadas. Material y Métodos: Muestras de forma rectangular se prepararon para testear la resistencia a la flexión y al impacto según ISO 1567. Las resinas de base de prótesis utilizadas fueron resinas acrílicas convencionales, de alto impacto, y de curado térmico reforzadas con fibra de vidrio o nylon. Posteriormente se clasificaron en los subgrupos A y B según la inmersión en agua destilada o limpiador de prótesis (3,8% de perborato de sodio). Se midieron la resistencia a la flexión y la resistencia al impacto de las muestras. El diseño del estudio fue de un estudio observacional de casos y controles. Se utilizó el software de análisis estadístico SPSS versión 25, y se siguió la guía de la declaración STROBE. Resultado: La resistencia a la flexión fue más alta para la resina de curado por calor reforzada con fibra de vidrio seguida de la resina de curado por calor convencional, la resina de curado por calor de alto impacto y la resina de curado por calor reforzada con nylon, respectivamente. La resistencia al impacto fue más alta para la resina de curado por calor de alto impacto seguida de la resina de curado por calor reforzada con fibra de vidrio, la resina de curado por calor convencional y la resina reforzada con fibra de nylon, respectivamente. Conclusión: Todas las resinas de base de prótesis probadas exhibieron una disminución en la resistencia a la flexión y al impacto después del uso de un limpiador de prótesis.

Nueva técnica de reconstrucción postendodóncica: resina bulk-fill intraconducto vs postes de fibra de vidrio / New postendodontic reconstruction technique: bulk-fill intracanal resin vs glass fiber posts

Introducción: El uso de postes de fibra de vidrio es el método actual más utilizado para la reconstrucción postendodóncica. Sin embargo, su adhesión sigue siendo impredecible debido al control limitado de su técnica de cementación. Las resinas bulk-fill revelan valores de fuerza flexural similares a la dentina y su empleo en la reconstrucción postendodóncica podría ser una alternativa viable y conservadora. Objetivo: Comparar tres técnicas de reconstrucción postendodóncica al medir su resistencia a fuerzas de desalojo, clasificar el tipo de fractura y falla adhesiva, evaluar su costo y tiempo de trabajo. Material y métodos: Se realizan 18 muestras divididas en tres grupos: grupo 1: poste más cemento de un paso, grupo 2: poste más cemento de tres pasos y grupo 3: reconstrucción postendodóncica con resina bulk-fill. Resultados: En la evaluación de la fuerza al desalojo no se encontró diferencia estadísticamente significativa en los tres grupos. Respecto al comportamiento y falla adhesiva, se encontró una diferencia significativa p < 0.001, favoreciendo a los grupos 2 y 3, por su adhesión en la porción radicular. El tipo de fractura fue restaurable para los tres grupos. Respecto al tiempo y costo, fueron significativamente menores para el grupo 3. Conclusión: En nuestro estudio no existió diferencia significativa en la fuerza al desalojo en los tres grupos; sin embargo, la hubo en el comportamiento, falla adhesiva, costo y tiempo, favoreciendo mayormente al grupo 3. La técnica de reconstrucción con resina puede ser una técnica predecible, suficientemente resistente, conservadora, rápida y de menor costo

Introduction: The use of fiberglass posts is the current method most used for post-endodontic reconstruction. However, its adhesion remains unpredictable due to the limited control of its cementing technique. Bulkfill resins reveal values of flexural strength similar to dentin and their use in post-endodontic reconstruction could be a viable and conservative alternative. Objective: Compare three post-endodontic reconstruction techniques by measuring their resistance to eviction forces, classifying the type of fracture and adhesive failure, evaluating their cost and time of work. Material and methods: 18 samples are divided into 3 groups: group 1: post plus cement of 1 step, group 2: post plus cement of 3 steps and group 3: post-endodontic reconstruction with bulk-fill resin. Results: In the evaluation of the force to the eviction, no statistically significant difference was found in the 3 groups. Regarding the behavior and adhesive failure, a significant difference was found p < 0.001, favoring groups 2 and 3, due to its adhesion in the root portion. The type of fracture was restorable for the 3 groups. Regarding time and cost, they were significantly lower for group 3. Conclusion: In our study there was no significant difference in the force to the eviction in the three groups, however there was in the behavior, adhesive failure, cost and time, favoring mainly the group 3. The technique of reconstruction with resin can be a predictable technique, Sufficiently resistant, conservative, fast and of lower cost (AU)

Influence of light transmission through fiber posts: Quantitative analysis, microhardness, and on bond strength of a resin cement

Light transmission (LT) into deeper areas of the dentin root is limited. Aim: The aim of this study is to perform a quantitative investigation of the radial transmission of light (LT) through different fiber posts and its influence on the Knoop hardness number (KHN) and bond strength (BS) of a dual-cure self-adhesive resin cement at 3 different depths. Materials and Methods: Four types of fiber posts (2 translucent and 2 conventional) were used. LT and KHN analyses were performed in a specially designed matrix, which allowed measurements at 3 different depths. LT was measured using a volt-ampere meter while KHN tests were performed in a microhardness tester. For BS analysis, endodontically treated bovine roots were divided into 4 groups, each group receiving one type of post. After cementation, cross sections of the root were tested for resistance to displacement using a universal testing machine. Statistical Analysis Used: Statistical analysis was performed by using this ANOVA and Tukey's test. Results: For LT, translucent posts showed significantly higher values at all depths compared to the conventional ones. For all posts, LT decreased at the deeper depths. The KHN results showed no statistical differences among the different posts, regardless of depth. For BS, a translucent post showed the highest values, and comparative analyses between the different depths of posts also showed statistically significant differences while comparisons among the different depths of the same post showed no differences. Conclusions: LT depended on the type of post and on depth. The type of post did not significantly influence the cement KHN. A translucent post showed higher BS in pooled data.

A Case of Irritant Contact Dermatitis due to Fiberglass in a Construction Worker / 대한피부과학회지

No abstract available.

Medición de la capa híbrida resultante del uso de cementos autograbadores de un paso y dos pasos / Hybrid layer measurement after using one-step and two-step self-etching cements

Antecedentes: La formación de la capa híbrida debe ser proporcional a la capacidad de los cementos para retener con éxito postes de fibra de vidrio en el interior del conducto preparado endodónticamente. Objetivo: Medir el espesor de la capa híbrida en los tercios coronal y apical as usar cementos autograbadores de uno y dos pasos. Métodos: Se realizó un estudio experimental con 30 premolares humanos que se trataron endodónticamente y se asignaron a tres grupos. Se cementaron postes de fibra de vidrio con tres cementos siguiendo las instrucciones de los fabricantes. Se realizaron cortes coronales y apicales y se cuantificó el grosor de la capa híbrida por microscopía electrónica de barrido. Los datos se analizaron con las pruebas estadísticas H de Kruskal-Wallis y U de Mann-Whitney (p<0,05). Resultados: El promedio del grosor de la capa híbrida fue de 0,74 mm con Multilink N® (grupo 1), 0,24 mm con RelyX Ultimate® (grupo 2) y 0,03 mm con RelyX U200® (grupo 3) (p = 0,0092). Los promedios en los tercios coronal y apical fueron: 1,29 mm y 0,19 mm para el grupo 1; 0,33 mm y 0,14 mm para el grupo 2 y 0,26 mm y 0,23 mm para el grupo 3, diferencias que fueron estadísticamente significativas (p = 0,043). Conclusiones: El espesor de la capa híbrida formada con el uso de los cementos de dos pasos fue mayor que con el cemento de un solo paso, especialmente en la porción coronal.

Background: Hybrid layer formation should be proportional to cement properties to successfully retain fiberglass posts into root canals. Purpose: To measure of hybrid layer thickness in coronal and apical thirds after using one-step and two-step self-etching cements. Methods: This experimental study used 30 human premolars with root-canal treatments, which were assigned into three groups. Fiberglass posts were cemented with three types of self-etching cements following manufacturers' instructions. Roots were cut in the coronal and apical thirds and hybrid layer thickness was quantified through scanning electron microscopy. Data were analyzed with Kruskal-Wallis and Mann-Whitney tests (p < 0.05). Results: Average thickness of the hybrid layer was 0.74 µm with Multilink N™ (group 1), 0.24 µm with RelyX Ultimate™ (group 2), and 0.03 µm with RelyX U200™ (group 3) (p = 0.0092). Average thickness in coronal and apical thirds were: 1.29 µm and 0.19 µm for group 1; 0.33 µm and 0.14 µm for group 2; and 0.26 µm and 0.23 µm for group 3, differences that were statistically significant (p = 0.043). Conclusions: The thickness of the hybrid layer formed after suing two-step cements was greater than that of one-step cement, especially in the tooth coronal third.

Correlation between the Mechanical Properties and Structural Characteristics of Different Fiber Posts Systems

Abstract The aim of this study was to evaluate the flexural strength and flexural modulus of different fiber-reinforcement composite (FRC) posts and determine the correlation between mechanical properties and structural characteristics. Eleven brands of fiber posts were analyzed (n=10): Exacto Cônico (Angelus), DT Light SL (VDW), RelyX Fiber Post (3M-Espe), Glassix Radiopaque (Nordim), Para Post Fiber White (Coltène), FRC Postec Plus (Ivoclar), Aestheti-Plus Post (Bisco), Superpost Cônico Estriado (Superdont), Superpost Ultrafine (Superdont), Reforpost (Angelus), and White Post DC (FGM). The posts were loaded in three-point bending test to calculate the flexural strength and flexural modulus using a mechanical testing machine (EMIC 2000 DL) at 0.5 mm/min. Data were submitted to one-way ANOVA and Scott-Knot test (p<0.05). The cross-sections of the posts were examined by scanning electron microscopy (SEM). Correlation between the mechanical properties and each of the structural variables was calculated by Pearson's correlation coefficients (p<0.05). The flexural strength values ranged from 493 to 835 MPa and were directly correlated with the fiber/matrix ratio (p=0.011). The flexural modulus ranged from 4500 to 8824 MPa and was inversely correlated with the number of fibers per mm2 of post (p<0.001). It was concluded that the structural characteristics significantly affected the properties of the FRC posts. The structural characteristic and mechanical properties of fiber glass posts are manufacture-dependent. A linear correlation between flexural strength and fiber/matrix ratio, as well as the flexural modulus and the amount of fiber was found.

Resumo O objetivo deste estudo foi avaliar a resistência à flexão e módulo de flexão de diferentes pinos reforçados com fibra (PRF) e determinar a correlação entre propriedades mecânicas e características estruturais. Foram analisadas onze marcas de pinos de fibra (n=10): Exacto Cónicos (Angelus), DT Luz SL (VDW), RelyX Fiber Post (3M ESPE), Glassix Radiopaque (Nordim), Pará Publicar Fiber White (Coltène), FRC Postec Plus (Ivoclar), Aestheti-Plus Post (Bisco), Superpost Cónicos Estriado (Superdont), Superpost Ultrafino (Superdont), Reforpost (Angelus), e White Post DC (FGM). Os pinos foram avaliados por meio de ensaio de flexão de três pontos para calcular a resistência à flexão e módulo de flexão utilizando uma máquina de ensaios mecânicos (EMIC 2000 DL) a 0,5 mm/min. Os dados foram submetidos a ANOVA one-way e teste de Scott-Knot (p<0,05). As secções transversais dos pinos foram examinadas usando microscopia eletrônica de varredura (MEV). A correlação entre as propriedades mecânicas e de cada uma das variáveis estruturais foi calculada por coeficientes de correlação de Pearson (p<0,05). Os valores da resistência à flexão variaram de 493-835 MPa e foram diretamente correlacionados com a proporção de fibra/matriz (p=0,011). O módulo de flexão variou de 4500 a 8824 MPa e foi inversamente correlacionado com o número de fibras por mm2 (p<0,001). Concluiu-se que as características estruturais afetam de forma significativa as propriedades dos pinos de fibra. As características estruturais e propriedades mecânicas dos pinos de fibra de vidro são dependentes do processo de fabricação. Existe uma correlação linear entre a resistência à flexão e proporção de fibra/matriz, bem como entre o módulo de flexão e a quantidade de fibras.

Observation of curative effect of high strength glass fiber composite resin post crown defect / 中国基层医药

Objective To investigate the clinical curative effect of high strength fiberglass composite resin post crown defect.Methods 102 teeth with dental coronal defect from 76 patients were divided into observation group and control group according to their wishes.The observation group (52 teeth) was treated with high strength glass fiber composite resin.Meanwhile,the control group(50 teeth) was treated with nickel-chromium alloy casting post-and-core joint nickel-chromium alloy PFM crown.The two groups received follow-up visit after completing treatment for one year.Results After one year follow -up, 1 patient appeared root fracture and 2 patients had gingival abnormal,the success rate in the observation group was 96.15%.In the control group,4 patients had root fracture,5 cases had core loose or fall off and 8 cases appeared gingival abnormal,the success rate was 78.00%.The results showed that the differences between the two groups were significant(χ2 =5.358,P=0.021;χ2 =4.258,P=0.039;χ2 =32.967,P=0.000).According to the patients satisfaction survey,the satisfaction rate in the observation group was 92.50%,which in the control group was only 66.67%,the difference was statistically significant(χ2 =7.982,P=0.005).Conclusion High strength fiberglass composite resin had higher success rate to patients with teeth defect,the satisfaction was superior and worthy of widely applied in clinic.

Descripción radiográfica de postes de titanio y de fibra de vidrio, cementados en premolares humanos sometidos in vitro a altas temperaturas con fines forenses / Radiographic description of titanium and fiberglass posts cemented in human premolars subjected to high temperatures in vitro for forensic purposes

Introducción: durante el proceso de identificación forense de cadáveres y restos humanos quemados, carbonizados o incinerados, el análisis de los materiales empleados en los diferentes tratamientos odontológicos se constituye en un marcador fehaciente para lograr una identificación positiva. El objetivo de este trabajo fue describir los cambios radiográficos de postes de titanio y de fibra de vidrio cementados, en premolares humanos sometidos a altas temperaturas con fines forenses. Métodos: estudio pseudo-experimental in vitro que observó los cambios radiográficos de los tejidos dentales (esmalte, dentina y cemento), de los materiales de uso endodóncico gutapercha (Wave One® de Dentsply Maillefer®), material de obturación (Top Seal® de Dentsply Maillefer®), material de cementación de los postes (Relyx TM ARC de 3M ESPE®) y de los postes de titanio (Tenax® Endodontic Post System de Coltene®) y fibra de vidrio (Tenax® Fiber Trans de Coltene®) en 30 dientes humanos, sometidos a cinco rangos de temperatura 200, 400, 600, 800 y 1000ºC. Resultados: los tejidos y los materiales dentales estudiados presentan gran resistencia a las altas temperaturas, sin variar considerablemente su macro-estructura (fisuras, grietas, fracturas y fragmentación), de tal manera que los cambios físicos pueden identificarse a través de radiografía convencional, y asociarse a cada rango de temperatura específico. Conclusiones: los postes cementados en premolares humanos presentan gran resistencia a la acción de altas temperaturas, razón por la cual pueden ser visualizados a través de radiografía convencional, contribuyendo con el proceso de identificación y documentación de la necropsia médico-legal de un cadáver o restos humanos que hayan resultado quemados, incinerados o carbonizados

IIntroduction: during the process of forensic identification of corpses and burnt, carbonized, or incinerated human remains, the analysis of materials used in dental treatments is a reliable marker for accurate identification. The objective of this study was to describe the radiographic changes of titanium and fiberglass posts cemented in human premolars subjected to high temperatures for forensic purposes. Methods: this was a pseudo-experimental in vitro study to observe the radiographic changes of dental tissues (enamel, dentin, and cement) and the following endodontic materials: gutta-percha (Wave One® by Dentsply Maillefer®), obturation material (Top Seal® by Dentsply Maillefer®), post cementation material (Relyx TM ARC by 3M ESPE®), titanium posts (Tenax® Endodontic Post System by Coltene®), and fiberglass posts (Tenax® Fiber Trans by Coltene®) in 30 human teeth subject to five temperature ranges: 200, 400, 600, 800, and 1000° C. Results: the studied dental tissues and materials are highly resistant to high temperatures without significantly changing their macrostructure (fissures, cracks, fractures, and fragmentation), in such a way that the physical changes can be identified through conventional radiography and associated with each specific temperature range. Conclusions: posts cemented in human premolars have great resistance to the action of high temperatures, so they can be observed through conventional radiography thus contributing to the process of identification and documentation of the medico-legal autopsy of a corpse or human remains that have been burned, incinerated, or carbonized

Effect of Nd: YAG laser in the bond strength of fiberglass posts / Efeito da aplicação de Laser Nd: YAG na adesão de pinos de fibra de vidro

The aim of the present study was to compare the effects of Nd:YAG laser application in root canals on bond strengths of fiber posts.Material and Methods: Thirty single-rooted bovines were randomly divided into three groups (n = 10); root canal instrumentation was performed, and pretreatment was conducted as follows: C group: conventional treatment (without laser irradiation); ALC group: Nd:YAG laser was applied after adhesive; and LAC group: Nd:YAG laser was applied before adhesive. The fiber posts Rebilda 15 DC (Voco) were cemented with an adhesive system and resin cement,in accordance with the manufacturer’s instructions. Six slices with 1.0mm height was obtained for ofeach root and bond strength was measured by pushout test using a universal testing machine (0.5 mm/min). Data were analyzed using Kruskal-Wallis and Dunn’s tests (p < 0.05). Results: Push-out bond strengths to root canal dentin were affected by the type of treatment and root third. The use of Nd: YAGlaser after the application of adhesive system had ahigher bonding performance compared with the useof laser before the application. However, both of them were similar to the control group. Also, cervical and medium third presented higher bond strength values than the apical third. Conclusion: It must be conclude, in the conditions in which the studywas conduct, that the use of laser irradiation didnot improve the bonding performance of resinous cement inside the root canal...

Objective: O objetivo deste estudo foi comparar o efeito da aplicação intrarradicular do laser Nd:YAG na adesão de pinos de fibra de vidro. Material e Métodos: Trinta raízes unirradiculares de incisivos bovinos foram selecionadas, e após instrumentação, foram divididas aleatoriamente em três grupos (n= 10) de acordo com o tratamento das paredes do canal: C: tratamento convencional (sem radiação laser), ALC: aplicação do Laser Nd:YAG após o adesivo; e LAC: aplicação do laser antes do adesivo. Pinos de fibra de vidro Rebilda 15 DC (Voco) foram cimentados com adesivo e cimento resinoso de acordo com instruções do fabricante. Seis fatias (duas para cada terço radicular) com 1 mm de espessura foram obtidas de cada raiz para mensuração da resistência adesiva por meio de teste push-out realizado em máquina de ensaio universal (0,5 mm/min). Os dados foram analisados por meio dos testes Kruskal-Wallis e Dunn (p < 0,05). Resultados: A resistência adesiva dos pinos na dentina radicular foi influenciada pelo tipo de tratamento e terço radicular. O uso do laser de Nd:YAG após a aplicação do adesivo apresentou melhor performance comparada ao seu uso antes do adesivo, porém, ambos foram similares ao controle. Ainda, os terços cervical e médio apresentaram maior resistência comparado ao apical. Conclusão: Conclui-se que, ouso da irradiação laser nos parâmetros estudados, não melhora a performance adesiva de cimentos resinosos dentro do canal radicular...