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Influence of radiotherapy on the dentin properties and bond strength.
Rodrigues, Renata Borges; Soares, Carlos José; Junior, Paulo Cézar Simamoto; Lara, Vitor Carvalho; Arana-Chavez, Victor Elias; Novais, Veridiana Resende.
Afiliação
  • Rodrigues RB; Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlandia, Av Pará 1720, Bloco 4L, Anexo A, 3° Andar, sala A32 Campus Umuarama, Uberlandia, MG, 38400-902, Brazil.
  • Soares CJ; Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlandia, Av Pará 1720, Bloco 4L, Anexo A, 3° Andar, sala A32 Campus Umuarama, Uberlandia, MG, 38400-902, Brazil.
  • Junior PCS; Department of Fixed Prosthodontics, Occlusion and Dental Materials, School of Dentistry, Federal University of Uberlândia, Av Pará 1720, Bloco 4L, Anexo A. Campus Umuarama, Uberlândia, MG, 38400-902, Brazil.
  • Lara VC; Sector of Radiotherapy, Clinics Hospital, Federal University of Triangulo Mineiro, Av Getulio Guarita, 130 Nossa Sra. da Abadia, Uberaba, MG, Brazil.
  • Arana-Chavez VE; Department of Biomaterials and Oral Biology, School of Dentistry, University of Sao Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil.
  • Novais VR; Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlandia, Av Pará 1720, Bloco 4L, Anexo A, 3° Andar, sala A32 Campus Umuarama, Uberlandia, MG, 38400-902, Brazil. veridianaresende@hotmail.com.
Clin Oral Investig ; 22(2): 875-883, 2018 Mar.
Article em En | MEDLINE | ID: mdl-28776096
OBJECTIVES: The objective of this study was to evaluate the biomechanical properties of dentin and the microtensile bond strength (µTBS) performed before or after radiotherapy (RT). MATERIAL AND METHODS: Dentin chemical composition (infrared spectroscopy-FTIR), SEM images, and mechanical properties (Vickers microhardness-VHN and elastic modulus-E) were evaluated comparing no irradiated and irradiate dentin (n = 5). RT was defined by application of 72 Gy (1.8 Gy daily, 5 days per week, during 8 weeks) with sample immersed in distilled water. µTBS evaluated three groups (n = 10): NI-no irradiated; IB-irradiation before restoration; and IA-irradiation after restoration. Resin-dentin sticks (1.0 mm2) were obtained and submitted to µTBS. Analysis of the bonding interface was made by confocal microscopy. RESULTS: After RT, percentage ratio of FTIR analysis showed increased absorption for all bands. SEM image showed a disorganized dentin structure. Two-way ANOVA showed increased VHN (p = 0.005) and decreased E (p < 0.001). For µTBS, one-way ANOVA and Duncan test showed significant differences among groups (p = 0.018). IB group presented the lowest bond strength values. CONCLUSIONS: RT alters the absorption bands and SEM images showed a disorganization of the dentin structure. Mechanical properties were changed with increased VHN and decreased E. µTBS was affected by the radiotherapy and restoration period (before or after). CLINICAL RELEVANCE: RT causes changes that contribute to increased risk of tooth decay. Restorative treatments can be performed using adhesive procedures, but it is preferable to be performed before of the irradiation protocol, to guarantee better adhesive properties to restoration.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dentina Tipo de estudo: Guideline Limite: Humans Idioma: En Revista: Clin Oral Investig Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dentina Tipo de estudo: Guideline Limite: Humans Idioma: En Revista: Clin Oral Investig Assunto da revista: ODONTOLOGIA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha