Influence of irrigation and obturation techniques on artificial lateral root canal filling capacity.

The aim of this study was to evaluate the influence of two different irrigation protocols on artificial lateral root canal filling capacity using different obturation techniques. Sixty single-root human teeth were used. Two artificial lateral canals were created in the apical third. Root canals were instrumented up to a 45 K-file to the working length. Before each file, root canals were irrigated either with 2 mL of 2.5% NaOCl or 2% chlorhexidine gel with further irrigation with saline solution and 3 mL of 17% EDTA. Specimens were randomly divided into three groups according to the obturation technique: (1) lateral compaction technique; (2) Tagger hybrid technique; and (3) thermoplasticized technique using BeeFill 2 in 1. All groups used AH Plus as the root canal sealer. The specimens were decalcified and cleared in methyl salicylate. The total length of lateral canals was observed under X30 magnification with a stereomicroscope and measured on the buccal and lingual root surfaces using Leica IM50 software. The data were submitted to ANOVA and Tukey test (p < 0.05). Among the obturation techniques, BeeFill 2 in 1 showed deeper penetration into all lateral canals than the lateral compaction or Tagger hybrid techniques (p < 0.05). The lateral compaction group showed the worst results (p < 0.05). Irrigants did not affect the outcome; there was no difference between NaOCl and chlorhexidine when the same obturation technique was used (p > 0.05). Regardless of the irrigant used during endodontic procedures, the thermoplasticized techniques showed higher penetration behavior for filling artificial lateral canals than the lateral compaction technique.

Effect of photoactivation mode on the hardness and bond strength of methacrylate- and Silorane monomer-based composites.

PURPOSE: To evaluate the Knoop hardness (KH) and the bond strength (BS) at the tooth/restoration interface of conventional methacrylate- (Filtek Supreme) and silorane-based (Filtek P90) composites photoactivated by different methods using an LED Freelight 2. MATERIALS AND METHODS: Bond strength was tested in a universal testing machine by the "push-out" test in restored cavities measuring 2 × 1.5 × 2 mm with a C-factor of 2.2, prepared in 60 bovine teeth. To restore the cavities, the respective adhesive system of each composite was used (Single Bond 2 and P90 system adhesives). The composites were photoactivated by 3 different methods: continuous light: 40 s at 1000 mW/cm²; soft-start: 10 s at 150 mW/cm² + 38 s at 1000 mW/cm²; pulse delay: 5 s at 150 mW/cm², followed by a 3-min wait (without photoactivation) and 39 s at 1000 mW/cm². Before the push-out test was performed, the KH was analyzed at the top and bottom of the restorations. Data were statistically anaylzed using ANOVA and Tukey's test. RESULTS: The photoactivation methods produced no differences in BS or KH in the same composite, while Filtek P90 (28.0 MPa) showed higher BS values than Filtek Supreme (22.3 MPa) and a lower KH. CONCLUSION: The composite Filtek P90 was capable of increasing bond strength, but presented lower Knoop hardness.

Infuence of irrigation and obturation techniques on artificial lateral root canal filling capacity

The aim of this study was to evaluate the influence of two dif-ferent irrigation protocols on artificial lateral root canalfilling capacity using different obturation techniques. Sixtysingle-root human teeth were used. Two artificial lateralcanals were created in the apical third. Root canals wereinstrumented up to a 45 K-file to the working length. Beforeeach file, root canals were irrigated either with 2 mL of 2.5%NaOCl or 2% chlorhexidine gel with further irrigation withsaline solution and 3 mL of 17% EDTA. Specimens were ran-domly divided into three groups according to the obturationtechnique: (1) lateral compaction technique; (2) Taggerhybrid technique; and (3) thermoplasticized technique usingBeeFill 2 in 1. All groups used AH Plus as the root canal seal-er. The specimens were decalcified and cleared in methylsalicylate. The total length of lateral canals was observedunder X30 magnification with a stereomicroscope and meas-ured on the buccal and lingual root surfaces using Leica IM50software. The data were submitted to ANOVA and Tukey test(p<0.05). Among the obturation techniques, BeeFill 2 in 1showed deeper penetration into all lateral canals than the lat-eral compaction or Tagger hybrid techniques (p<0.05). Thelateral compaction group showed the worst results (p<0.05).Irrigants did not affect the outcome; there was no differencebetween NaOCl and chlorhexidine when the same obturationtechnique was used (p>0.05). Regardless of the irrigant usedduring endodontic procedures, the thermoplasticized tech-niques showed higher penetration behavior for filling artificiallateral canals than the lateral compaction technique.

O objetivo do presente estudo foi avaliar a influência de doisdiferentes protocolos de irrigação na capacidade de penetraçãode canais artificiais, utilizando diferente técnicas de obturação.Sessenta dentes humanos unirradiculares foram utilizados. Doiscanais laterais artificiais foram confeccionados no terço apicaldo dente. Os canais foram instrumentados até uma lima K 45 nocomprimento de trabalho. Antes do uso de cada lima, os canaisradiculares foram irrigados com 2 mL de NaOCl 2.5% ou comClorexidina gel 2% seguido de solução salina. Ambos os gruposreceberam no final da instrumentação 3 mL de EDTA 17%. Osespecimes foram randomicamente separados em 3 subgrupos deacordo com a técnica de obturação utilizada: (1) técnica de com-pactação lateral; (2) técnica híbrida de Tagger; e (3) técnicatermoplástica utilizando o BeeFill 2 em 1. Em todos os grupos ocimento utilizado foi o AH Plus. Depois, os elementos foramdiafanizados utilizando metil salicilato. As extensões de pe -netração dos cimentos nos canais laterais foram realizadas uti-lizando estereomicroscópio (X30). Os dados de cada grupoforam analizados utilizando ANOVA e o teste de Tukey (p<0.05).Dentre as técnicas de obturação, a técnica termoplástica uti-lizando o BeeFill 2 em 1 mostrou a maior penetração em canaislaterais (p<0.05). A técnica de compactação lateral apresentouos piores resultados dentes os grupos testados (p<0.05). Os irri-gantes não afetaram a penetração dos canais laterais; não foramobservados diferenças entre NaOCl e clorexidina, quando amesma técnica de obturação foi utilizada (p>0.05). Pode-se con-cluir que independente da substância química auxiliar utilizada,as técnicas termoplásticas de obturação demonstraram maiorpenetração de canais laterais do que a técnica de compactação lateral.

Infuence of irrigation and obturation techniques on artificial lateral root canal filling capacity

The aim of this study was to evaluate the influence of two dif-ferent irrigation protocols on artificial lateral root canalfilling capacity using different obturation techniques. Sixtysingle-root human teeth were used. Two artificial lateralcanals were created in the apical third. Root canals wereinstrumented up to a 45 K-file to the working length. Beforeeach file, root canals were irrigated either with 2 mL of 2.5%NaOCl or 2% chlorhexidine gel with further irrigation withsaline solution and 3 mL of 17% EDTA. Specimens were ran-domly divided into three groups according to the obturationtechnique: (1) lateral compaction technique; (2) Taggerhybrid technique; and (3) thermoplasticized technique usingBeeFill 2 in 1. All groups used AH Plus as the root canal seal-er. The specimens were decalcified and cleared in methylsalicylate. The total length of lateral canals was observedunder X30 magnification with a stereomicroscope and meas-ured on the buccal and lingual root surfaces using Leica IM50software. The data were submitted to ANOVA and Tukey test(p<0.05). Among the obturation techniques, BeeFill 2 in 1showed deeper penetration into all lateral canals than the lat-eral compaction or Tagger hybrid techniques (p<0.05). Thelateral compaction group showed the worst results (p<0.05).Irrigants did not affect the outcome; there was no differencebetween NaOCl and chlorhexidine when the same obturationtechnique was used (p>0.05). Regardless of the irrigant usedduring endodontic procedures, the thermoplasticized tech-niques showed higher penetration behavior for filling artificiallateral canals than the lateral compaction technique.(AU)

O objetivo do presente estudo foi avaliar a influÛncia de doisdiferentes protocolos de irrigaþÒo na capacidade de penetraþÒode canais artificiais, utilizando diferente técnicas de obturaþÒo.Sessenta dentes humanos unirradiculares foram utilizados. Doiscanais laterais artificiais foram confeccionados no terþo apicaldo dente. Os canais foram instrumentados até uma lima K 45 nocomprimento de trabalho. Antes do uso de cada lima, os canaisradiculares foram irrigados com 2 mL de NaOCl 2.5% ou comClorexidina gel 2% seguido de soluþÒo salina. Ambos os gruposreceberam no final da instrumentaþÒo 3 mL de EDTA 17%. Osespecimes foram randomicamente separados em 3 subgrupos deacordo com a técnica de obturaþÒo utilizada: (1) técnica de com-pactaþÒo lateral; (2) técnica híbrida de Tagger; e (3) técnicatermoplástica utilizando o BeeFill 2 em 1. Em todos os grupos ocimento utilizado foi o AH Plus. Depois, os elementos foramdiafanizados utilizando metil salicilato. As extens§es de pe -netraþÒo dos cimentos nos canais laterais foram realizadas uti-lizando estereomicroscópio (X30). Os dados de cada grupoforam analizados utilizando ANOVA e o teste de Tukey (p<0.05).Dentre as técnicas de obturaþÒo, a técnica termoplástica uti-lizando o BeeFill 2 em 1 mostrou a maior penetraþÒo em canaislaterais (p<0.05). A técnica de compactaþÒo lateral apresentouos piores resultados dentes os grupos testados (p<0.05). Os irri-gantes nÒo afetaram a penetraþÒo dos canais laterais; nÒo foramobservados diferenþas entre NaOCl e clorexidina, quando amesma técnica de obturaþÒo foi utilizada (p>0.05). Pode-se con-cluir que independente da substÔncia química auxiliar utilizada,as técnicas termoplásticas de obturaþÒo demonstraram maiorpenetraþÒo de canais laterais do que a técnica de compactaþÒo lateral.(AU)

Influence of irrigation and obturation techniques on artificial lateral root canal filling capacity. / Influence of irrigation and obturation techniques on artificial lateral root canal filling capacity.

The aim of this study was to evaluate the influence of two different irrigation protocols on artificial lateral root canal filling capacity using different obturation techniques. Sixty single-root human teeth were used. Two artificial lateral canals were created in the apical third. Root canals were instrumented up to a 45 K-file to the working length. Before each file, root canals were irrigated either with 2 mL of 2.5

NaOCl or 2

chlorhexidine gel with further irrigation with saline solution and 3 mL of 17

EDTA. Specimens were randomly divided into three groups according to the obturation technique: (1) lateral compaction technique; (2) Tagger hybrid technique; and (3) thermoplasticized technique using BeeFill 2 in 1. All groups used AH Plus as the root canal sealer. The specimens were decalcified and cleared in methyl salicylate. The total length of lateral canals was observed under X30 magnification with a stereomicroscope and measured on the buccal and lingual root surfaces using Leica IM50 software. The data were submitted to ANOVA and Tukey test (p < 0.05). Among the obturation techniques, BeeFill 2 in 1 showed deeper penetration into all lateral canals than the lateral compaction or Tagger hybrid techniques (p < 0.05). The lateral compaction group showed the worst results (p < 0.05). Irrigants did not affect the outcome; there was no difference between NaOCl and chlorhexidine when the same obturation technique was used (p > 0.05). Regardless of the irrigant used during endodontic procedures, the thermoplasticized techniques showed higher penetration behavior for filling artificial lateral canals than the lateral compaction technique.

Pino anatômico com resina composta: relato de caso / Anatomic fiber post with composite resin: case report

O protocolo restaurador de dentes tratados endodonticamente é um desafio na odontologia adesiva atual, já que existem vários tipos de retentores intrarradiculares à disposição no mercado, com características ópticas e mecânicas que promovem um tratamento satisfatório. Dessa forma, a técnica de pino de fibra anatômico reembasado com resina composta direta torna-se eficiente para uso na clínica odontológica, especialmente em casos de condutos largos e tamanho reduzido de férula. Para tanto, o pino é limpo, aplica-se o silano e adesivo, além da resina composta não polimerizada para moldar o conduto radicular. Após, o pino é tratado novamente e cimentado com uma pequena espessura de linha de cimentação. Nesse artigo, o caso clinico abordará as etapas necessárias para a confecção do pino anatômico, além das estratégias de cimentação adesiva e a restauração com resina composta, trabalhando os conceitos da manutenção de uma delgada linha de cimentação para uma adequada reabilitação dental mantendo biomecânica e retenção do pino de fibra no interior do conduto radicular.

The restorative protocol for endodontically treated teeth is a challenge in adhesive dentistry, since there are several available types of intracanal posts with optical and mechanical characteristics that promotea satisfactory treatment. Thus, the anatomical fiber post technique is efficient for the use in dental practice, especially in cases of large root canals and small dental ferrules. So, the post is cleaned and then the silaneagent and adhesive system are applied, followed by the placement of the non-polymerized composite for root canal modeling. After this, the anatomical fiber post is treated again and followed by the luting procedure, showing a small cementation thickness. In this paper, the case report will address the necessary steps to realize the anatomical fiber post technique using strategies and adhesive cementation with composite resin restoration, working the concepts of maintaining a thin cement line and an adequate dental rehabilitation.

Impact of extended radiant exposure time on polymerization depth of fluoride-containing fissure sealer materials.

Physical properties such as surface hardness of dental materials are directly linked to their clinical behavior. The aim of this study was to investigate the influence of extended curing time on the polymerization depth offluoride-containing materials used as pit and fissure sealants. Conventional and extended exposure times (20 and 60 seconds) were used to photoactivate a gold-standard pit and fissure sealant (Fluroshield, Dentsply) and a flowable composite (PermaFlo, Ultradent). Twenty square-shaped samples (n=5) were prepared using a LED device (Bluephase 16i, Ivoclar). The Knoop Hardness Number (KHN) was calculated for the top and bottom surface of each sample 24 hours after polymerization. Bottom/top hardness ratio (B/T KHN) was than calculated. Averages were analyzed by two-way ANOVA and Tukey test (alpha=0.05). The flowable composite had higher KHN than conventional pit and fissure sealant for all experimental conditions (p<0.05). The 60-second photoactivation time increased KHN at the bottom surface and B/T KHN only of composite specimens. The flowable composite had better physical properties than the pit and fissure sealant, and they were improved by extended curing time.

Effect of endodontic sealer and resin luting strategies on pull-out bond strength of glass fiber posts to dentin.

The aim of this study was to evaluate the influence of eugenol-containing endodontic sealers and luting strategy on the pull-out bond strength of glass fiber posts to dentin. Sixty-four bovine incisors were randomly assigned into two groups of 32 specimens each for obturation procedure with gutta-percha only, or with Pulp Canal Sealer EWT Subsequently, the roots were prepared for the fiber post Reforpost and all specimens of each endodontic sealing procedure were allocated to four groups (n = 8), according to the strategies for post cementation: A) Single Bond 2 and RelyX ARC; B) All Bond 2 and C&B cement; C) All Bond 2 and RelyX ARC; D) Single Bond 2 and C&B Cement. The posts were cemented immediately after the endodontic treatment. The pull-out test was performed at a cross-head speed of 0.5 mm/min in a universal testing machine (EMIC). Data (Kgf) were submitted to a two-way ANOVA and Tukey test (p < or = 0.05). The eugenol-based sealer did not influence the pull-out bond strength of fiber posts regardless of the luting strategy. RelyX ARC showed higher bond strength than C&B Cement when used with Single Bond 2 adhesive system, when the eugenol-based sealer was present. All Bond 2, when associated to all cements studied, promoted similar bond strength, regardless of the eugenol-containing endodontic sealer In conclusion, eugenol-containing sealer did not influence the pull-out bond strength values of the resin luting systems for glass fiber post cementation. The bond system and resin cement association from the same manufacturer had similar bond strength values for dentin.