Abstract:One of the clinically relevant problems dentists face when restoring endodontically treated teeth is the mismatch between fiber post and post space diameters, which results in an excessively thick resin cement layer. Fiber post relining appears as a solution for this problem.Objectives:The aim of this study was to evaluate the effect of fiber post relining with composite resin on push-out bond strength.Material and Methods:Twenty bovine incisors were selected to assess post retention. The crowns were removed b… Show more
“…Adhesive failure at the cement-dentin interface was the most common defect (57%), as shown in Figure 1A, followed by mixed fracture, which represented adhesive fracture associated with cohesive failure of the cement ( Figure 1B). These findings confirm the difficulty in establishing good interaction between the cement and dentin substrate, probably because of the great variability in root canal morphology and features of resin system bonding, as described in other studies 13,25 . Although some studies 10,13,18 have discussed the post relining technique, further studies are needed to safely apply this procedure.…”
Section: Discussionsupporting
confidence: 89%
“…Therefore, the third hypothesis tested in the present study, which was that post shear bond strength would be higher in the cervical than in the other root regions, was accepted. Indeed, the highest bond strength values were found in the cervical root region, except for ARC-R and U100-NR, in which no statistical differences were found between the root thirds, as also reported by Faria-e-Silva et al 13 .…”
Section: Discussionsupporting
confidence: 82%
“…Indeed, another study showed that post relining enhanced shear bond strength, irrespective of cement type 14 . However, the hypothesis was only partially accepted since the effects of relining were observed only when RelyX ARC cement was used, as found by Faria-e-Silva et al 13 . The ARC-R treatment produced a thinner, more uniform and stronger cement layer compared with that of ARC-NR, the latter exhibiting low bond strength values in the middle and apical third of roots.…”
Section: Discussionmentioning
confidence: 99%
“…Nevertheless, this technique has a number of advantages. The relined post is tightly inserted into the root canal, so that cement pressure against the canal walls improves cement-bond contact, avoiding water absorption 13 and reducing porosity at the bond interface 13,19 . This prevents bubble formation 11 that can inhibit polymerization, if there are trapped bubbles in the cement layer 19 .…”
Section: Discussionmentioning
confidence: 99%
“…Few studies have shown the efficiency of relined posts 13,14 , also known as anatomical posts 10,12 . Some researchers 7,8 have attributed the shear strength of intraradicular fiber post cementation not only to the action of adhesive agents but also to frictional forces; however, studies that investigate this relationship are scarce, especially as regards shaped glass fiber posts.…”
ResumoIntrodução: O correto uso de pinos de fibra de vidro em dentes tratados endodonticamente é essencial para o sucesso clínico do tratamento restaurador. Objetivo: Esse estudo avaliou a resistência ao cisalhamento por extrusão (push-out) em pinos de fibra de vidro reembasados (R) ou não reembasados (NR), cimentados com cimento resinoso auto-adesivo [RelyX TM U100 (U100)] e cimento resinoso convencional [RelyX TM ARC (ARC)]. Material e método: Sessenta dentes humanos unirradiculares foram tratados endodonticamente e divididos nos grupos ARC-NR; U100-NR; ARC-R; U100-R. Os dentes foram seccionados nos terços cervical, médio e apical para serem submetidos ao teste de cisalhamento por extrusão (push-out). A resistência de união foi analisada pelo teste de Friedman; os tipos de cimento e de pinos foram comparados pelo teste de Mann Whitney. O padrão de falhas foi avaliado com câmera digital através de imagens em 200x de ampliação e foi classificado como falhas adesivas (na interface cimento/dentina ou cimento/pino), coesivas (cimento ou pino), e mistas. Resultado: No grupo ARC-NR, os valores de resistência de união foram maiores no terço cervical; os grupos U100-NR e ARC-R foram semelhantes entre os terços. No grupo U100-R, os valores de resistência de união foram semelhantes nos terços cervical e médio, e houve menor valor no terço apical. Para pinos de fibra de vidro não reembasados, a média mais alta dos valores de resistência de união foi com cimento resinoso auto-adesivo. Considera-se ainda que os pinos reembasados com cimento resinoso convencional tiveram camada de cimento mais forte em comparação com os pinos de fibra não reembasados. Conclusão: A técnica do pino reembasado foi eficiente no grupo ARC-R. Os grupos ARC-NR e U100-R mostraram melhor resistência de união na região cervical das paredes do canal radicular. As principais falhas foram adesivas na interface cimento-pino.Descritores: Colagem dentária; materiais dentários; dentina; técnica para retentor intrarradicular; resistência ao cisalhamento.
AbstractIntroduction: The correct use of glass fiber posts in endodontically treated teeth is essential for the clinical success of restorative treatment. Objective: This study evaluated the push-out shear bond strength of relined (R) or non-relined (NR) glass fiber posts, cemented with self-adhesive resin cement [RelyX TM U100 (U100)] and conventional resin cement [RelyX TM ARC (ARC)]. Material and method: Sixty human single-rooted teeth were endodontically treated and divided into ARC-NR; U100-NR; ARC-R; U100-R groups. The teeth were sectioned into cervical, middle and apical thirds, and subjected to the push-out test. Bond strength was analyzed by the Friedman test; cement and post types were compared by the Mann Whitney test. The pattern of failures was evaluated with digital camera through images at 200x magnification, and was classified as adhesive (at the cement/dentin or cement/post interface), cohesive (cement or post), and mixed failures. Result: In ARC-NR, bond strength values were higher in the ce...
“…Adhesive failure at the cement-dentin interface was the most common defect (57%), as shown in Figure 1A, followed by mixed fracture, which represented adhesive fracture associated with cohesive failure of the cement ( Figure 1B). These findings confirm the difficulty in establishing good interaction between the cement and dentin substrate, probably because of the great variability in root canal morphology and features of resin system bonding, as described in other studies 13,25 . Although some studies 10,13,18 have discussed the post relining technique, further studies are needed to safely apply this procedure.…”
Section: Discussionsupporting
confidence: 89%
“…Therefore, the third hypothesis tested in the present study, which was that post shear bond strength would be higher in the cervical than in the other root regions, was accepted. Indeed, the highest bond strength values were found in the cervical root region, except for ARC-R and U100-NR, in which no statistical differences were found between the root thirds, as also reported by Faria-e-Silva et al 13 .…”
Section: Discussionsupporting
confidence: 82%
“…Indeed, another study showed that post relining enhanced shear bond strength, irrespective of cement type 14 . However, the hypothesis was only partially accepted since the effects of relining were observed only when RelyX ARC cement was used, as found by Faria-e-Silva et al 13 . The ARC-R treatment produced a thinner, more uniform and stronger cement layer compared with that of ARC-NR, the latter exhibiting low bond strength values in the middle and apical third of roots.…”
Section: Discussionmentioning
confidence: 99%
“…Nevertheless, this technique has a number of advantages. The relined post is tightly inserted into the root canal, so that cement pressure against the canal walls improves cement-bond contact, avoiding water absorption 13 and reducing porosity at the bond interface 13,19 . This prevents bubble formation 11 that can inhibit polymerization, if there are trapped bubbles in the cement layer 19 .…”
Section: Discussionmentioning
confidence: 99%
“…Few studies have shown the efficiency of relined posts 13,14 , also known as anatomical posts 10,12 . Some researchers 7,8 have attributed the shear strength of intraradicular fiber post cementation not only to the action of adhesive agents but also to frictional forces; however, studies that investigate this relationship are scarce, especially as regards shaped glass fiber posts.…”
ResumoIntrodução: O correto uso de pinos de fibra de vidro em dentes tratados endodonticamente é essencial para o sucesso clínico do tratamento restaurador. Objetivo: Esse estudo avaliou a resistência ao cisalhamento por extrusão (push-out) em pinos de fibra de vidro reembasados (R) ou não reembasados (NR), cimentados com cimento resinoso auto-adesivo [RelyX TM U100 (U100)] e cimento resinoso convencional [RelyX TM ARC (ARC)]. Material e método: Sessenta dentes humanos unirradiculares foram tratados endodonticamente e divididos nos grupos ARC-NR; U100-NR; ARC-R; U100-R. Os dentes foram seccionados nos terços cervical, médio e apical para serem submetidos ao teste de cisalhamento por extrusão (push-out). A resistência de união foi analisada pelo teste de Friedman; os tipos de cimento e de pinos foram comparados pelo teste de Mann Whitney. O padrão de falhas foi avaliado com câmera digital através de imagens em 200x de ampliação e foi classificado como falhas adesivas (na interface cimento/dentina ou cimento/pino), coesivas (cimento ou pino), e mistas. Resultado: No grupo ARC-NR, os valores de resistência de união foram maiores no terço cervical; os grupos U100-NR e ARC-R foram semelhantes entre os terços. No grupo U100-R, os valores de resistência de união foram semelhantes nos terços cervical e médio, e houve menor valor no terço apical. Para pinos de fibra de vidro não reembasados, a média mais alta dos valores de resistência de união foi com cimento resinoso auto-adesivo. Considera-se ainda que os pinos reembasados com cimento resinoso convencional tiveram camada de cimento mais forte em comparação com os pinos de fibra não reembasados. Conclusão: A técnica do pino reembasado foi eficiente no grupo ARC-R. Os grupos ARC-NR e U100-R mostraram melhor resistência de união na região cervical das paredes do canal radicular. As principais falhas foram adesivas na interface cimento-pino.Descritores: Colagem dentária; materiais dentários; dentina; técnica para retentor intrarradicular; resistência ao cisalhamento.
AbstractIntroduction: The correct use of glass fiber posts in endodontically treated teeth is essential for the clinical success of restorative treatment. Objective: This study evaluated the push-out shear bond strength of relined (R) or non-relined (NR) glass fiber posts, cemented with self-adhesive resin cement [RelyX TM U100 (U100)] and conventional resin cement [RelyX TM ARC (ARC)]. Material and method: Sixty human single-rooted teeth were endodontically treated and divided into ARC-NR; U100-NR; ARC-R; U100-R groups. The teeth were sectioned into cervical, middle and apical thirds, and subjected to the push-out test. Bond strength was analyzed by the Friedman test; cement and post types were compared by the Mann Whitney test. The pattern of failures was evaluated with digital camera through images at 200x magnification, and was classified as adhesive (at the cement/dentin or cement/post interface), cohesive (cement or post), and mixed failures. Result: In ARC-NR, bond strength values were higher in the ce...
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