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Oval versus circular-shaped root canals: bond strength reached with varying post techniques
Webber, Mariana Benedetti Ferreira; Bernardon, Paula; França, Fabiana M G; Amaral, Flávia L B; Basting, Roberta T; Turssi, Cecilia Pedroso.
  • Webber, Mariana Benedetti Ferreira; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
  • Bernardon, Paula; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
  • França, Fabiana M G; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
  • Amaral, Flávia L B; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
  • Basting, Roberta T; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
  • Turssi, Cecilia Pedroso; Instituto de Pesquisas São Leopoldo Mandic. Faculdade São Leopoldo Mandic. Division of Cariology and Restorative Dentistry. Campinas. BR
Braz. dent. j ; 29(4): 335-341, July-Aug. 2018. tab, graf
Article in English | LILACS | ID: biblio-974166
ABSTRACT
Abstract The aim of this study was to compare the bond strength (BS) of glass fiber posts (GFP) luted to oval and circular-shaped root canals rehabilitated using varying post techniques, at different intraradicular levels. Ninety 16-mm-long roots of human mandibular premolars, classified either as having oval or circular-shaped canals, were endodontically treated and prepared for restoration using one of three different post techniques (n=15) 1) single GFP; 2) resin-relined GFP; 3) main GFP associated with accessory posts. GFPs were luted with a dual polymerizing resin cement (RelyX ARC) after the canal had been treated with a 3-step etch-and-rinse adhesive system (Adper Scothbond Multipurpose). The samples were sectioned into three 1-mm-thick sections, which were differentiated by the root level (cervical, middle and apical) and tested for push-out BS. Assessment of failure mode was made under a stereomicroscope. Data were analyzed using repeated measures three-way ANOVA and Tukey's test. The root canal cross-section had a significant influence on BS (p<0.001), with the lowest values being observed in oval-shaped canals. The post technique also significantly affected the BS (p=0.018), with the resin-relined GFPs providing the highest BS values in both oval and circular-shaped canals. Irrespective of the cross-section of the root canal and post technique, there was no significant difference in BS in the cervical, middle and apical third of the root canal (p=0.084). In oval-shaped canals, the BS to intraradicular dentin at cervical, middle or apical level could be increased when the GFPs posts were relined.
RESUMO
Resumo O objetivo deste estudo foi comparar a resistência de união (RU) de pinos de fibra de vidro (PFV), cimentados a condutos com secção transversal ovalada ou circular reabilitados com diferentes técnicas de restauração com PFVs, em função do nível intrarradicular. Noventa raízes de pré-molares inferiores humanos, com 16 mm de altura, classificadas como possuindo canais ovais ou circulares, foram tratadas endodonticamente e preparadas para serem reabilitadas com uma das três técnicas de restauração com PFVs (n=15) 1) PFV único, 2) PFV reembasado com resina composta, e 3) PFV principal associado a pinos acessórios. Os PFVs foram cimentados com um agente resinoso de polimerização dupla (RelyX ARC), após o canal ter sido tratado com um sistema adesivo de condicionamento total de três passos (Adper Scothbond Multiuso). As amostras foram seccionadas em três fatias de 1 mm de espessura, de acordo com o nível da raiz (cervical, médio e apical)e foram submetidas ao teste de RU por push-out. A análise do modo de falha foi realizada com auxílio de um estereomicroscópio. Os dados foram analisados utilizando-se a ANOVA a três critérios para medidas repetidas e o teste de Tukey. A secção do conduto apresentou influência na RU (p<0,001), com os menores valores sendo observados nos condutos ovalados. A técnica de restauração com PFVs afetou significativamente a RU (p=0,018), tendo o PFV reembasado proporcionado os maiores valores de RU, tanto em condutos ovais quanto circulares. Independentemente da secção transversal do conduto radicular e da técnica de restauração com PFV, não houve diferença significativa na RU nos terços cervical, médio e apical (p=0,084). Nos canais de secção transversal ovalada, a RU à dentina intrarradicular nos níveis cervical, médio ou apical aumentou com o emprego de PFVs reembasados.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Post and Core Technique / Dental Bonding / Dental Pulp Cavity Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Instituto de Pesquisas São Leopoldo Mandic/BR

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Full text: Available Index: LILACS (Americas) Main subject: Post and Core Technique / Dental Bonding / Dental Pulp Cavity Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Instituto de Pesquisas São Leopoldo Mandic/BR