Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/199907
Type: Artigo de periódico
Title: Effect Of Gamma Radiation On Bonding To Human Enamel And Dentin.
Author: Naves, Lucas Z
Novais, Veridiana R
Armstrong, Steven R
Correr-Sobrinho, Lourenço
Soares, Carlos J
Abstract: This study evaluated the effect of gamma radiation on the microtensile bond strength of resin-based composite restoration to human enamel and dentin performed either before or after radiotherapy. Thirty sound human third molars were sectioned mesio-distally into buccal and lingual halves and then randomly divided into enamel or dentin groups. Enamel and dentin substrates were randomly divided into three sub-groups (n = 10): Control, which received no irradiation; specimens were irradiated before restoration protocol; and specimens were irradiated after restoration protocol. Radiation therapy was defined by application of 60-Gy dose fractionally with daily exposures of 2 Gy, 5 days a week, over 6 weeks. Restorations were carried out using Adper Single Bond adhesive system and Filtek Z250 resin composite. The specimens were sectioned producing 4 sticks per specimen and submitted to microtensile on a testing machine. Data were submitted to two-way ANOVA followed by Tukey test (p < 0.05). Failure modes were examined under optical microscopy and SEM. Bond strength to enamel was significantly higher than to dentin irrespective radiation therapy. Radiotherapy applied before restoration significantly reduced the bond strength to both substrates. A predominance of adhesive failures was detected for control groups and groups restored before radiotherapy. Cohesive failures in dentin and enamel increased when the specimens were restored after irradiation. The gamma radiation had a significant detrimental effect on bond strength to human enamel and dentin when the adhesive restorative procedure was carried out after radiotherapy.
Subject: Analysis Of Variance
Composite Resins
Dental Bonding
Dental Enamel
Dentin
Dentin-bonding Agents
Gamma Rays
Humans
In Vitro Techniques
Microscopy, Electron, Scanning
Molar
Radiation Dosage
Tensile Strength
Rights: fechado
Identifier DOI: 10.1007/s00520-012-1414-y
Address: http://www.ncbi.nlm.nih.gov/pubmed/22415607
Date Issue: 2012
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File SizeFormat 
pmed_22415607.pdf270.12 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.