Degradation of trans-polyisoprene over time following the analysis of root fillings removed during conventional retreatment

dc.creatorManiglia-Ferreira, C
dc.creatorSilva, JBA
dc.creatorde Paula, RCM
dc.creatorFeitosa, JPA
dc.creatorZaia, AA
dc.creatorFerraz, CCR
dc.creatorGomes, BPFA
dc.creatorSouza-Filho, FJ
dc.date2007
dc.dateJAN
dc.date2014-11-15T22:26:36Z
dc.date2015-11-26T17:22:12Z
dc.date2014-11-15T22:26:36Z
dc.date2015-11-26T17:22:12Z
dc.date.accessioned2018-03-29T00:09:40Z
dc.date.available2018-03-29T00:09:40Z
dc.identifierInternational Endodontic Journal. Blackwell Publishing, v. 40, n. 1, n. 25, n. 30, 2007.
dc.identifier0143-2885
dc.identifierWOS:000242965200004
dc.identifier10.1111/j.1365-2591.2006.01172.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/79402
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/79402
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/79402
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1283553
dc.descriptionAim: To evaluate in vivo degradation of root filling materials over time. Methodology: Thirty-six root filled teeth with or without periapical lesions were selected. Teeth with poor coronal restoration were not included. The teeth had been root filled 3-30 years previous and were scheduled for conventional retreatment. The association of root canal treatment, age, periapical lesion and root filling degradation was investigated. The filling material was removed from the root canal using files and no solvent. Trans-1,4-polyisoprene was isolated through solubilization of root filling remnants in chloroform followed by filtration and centrifugation. Gel permeation chromatography (GPC) and infrared spectroscopy (FT-IR) were utilized to study the occurrence and degree of degradation. The GPC and FT-IR data were collected for each sample and analysed statistically using the Kruskal-Wallis test. Results: Degradation of trans-1,4-polyisoprene was a slow process. The process was identified as an oxidation reaction through the production of carboxyl and hydroxyl groups. Compared with the control group, significant molar mass decrease was noted after 15 years (P = 0.0146) in teeth with no periapical lesions. However, in teeth associated with periapical lesions the number of years for significant degradation was reduced to 5 (P = 0.0009). Conclusion: Polyisoprene degrades inside root canals as an oxidative process. The presence of periapical lesions was associated with a more rapid onset of degradation.
dc.description40
dc.description1
dc.description25
dc.description30
dc.languageen
dc.publisherBlackwell Publishing
dc.publisherOxford
dc.publisherInglaterra
dc.relationInternational Endodontic Journal
dc.relationInt. Endod. J.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectin vivo degradation
dc.subjectroot canal therapy
dc.subjecttrans-polyisoprene
dc.subjecttreatment outcome
dc.subjectEndodontically Treated Teeth
dc.subjectDental Gutta-percha
dc.subjectOxidative-degradation
dc.subjectNatural-rubber
dc.subjectFilled Teeth
dc.subjectNmr
dc.subjectIdentification
dc.subjectSealers
dc.subjectDisease
dc.subjectBrands
dc.titleDegradation of trans-polyisoprene over time following the analysis of root fillings removed during conventional retreatment
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución