Localized mechanics of dentin self-etching adhesive system

Autor: Ching Chang Ko, Manoel Martin Junior, Eduardo Passos Rocha, Renato Herman Sundfeld, Carlos Marcelo Archangelo, Rodolfo Bruniera Anchieta
Přispěvatelé: Universidade Estadual Paulista (Unesp), Univ N Carolina
Rok vydání: 2007
Předmět:
Zdroj: Journal of Applied Oral Science, Volume: 15, Issue: 4, Pages: 321-326, Published: AUG 2007
Journal of Applied Oral Science
Journal of Applied Oral Science v.15 n.4 2007
Journal of applied oral science
Universidade de São Paulo (USP)
instacron:USP
Journal of Applied Oral Science, Vol 15, Iss 4, Pp 321-326 (2007)
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1678-7757
Popis: Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:02:28Z No. of bitstreams: 1 WOS000256794400015.pdf: 267983 bytes, checksum: e92cd580522215e2213d474105f0c466 (MD5) Made available in DSpace on 2014-02-26T17:02:28Z (GMT). No. of bitstreams: 1 WOS000256794400015.pdf: 267983 bytes, checksum: e92cd580522215e2213d474105f0c466 (MD5) Previous issue date: 2007-07-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:23:33Z No. of bitstreams: 1 WOS000256794400015.pdf: 267983 bytes, checksum: e92cd580522215e2213d474105f0c466 (MD5) Made available in DSpace on 2014-05-20T15:23:33Z (GMT). No. of bitstreams: 1 WOS000256794400015.pdf: 267983 bytes, checksum: e92cd580522215e2213d474105f0c466 (MD5) Previous issue date: 2007-07-01 The bond strength of composite resins (CRs) to dentin is influenced by the interfacial microstructure of the hybrid layer (HL) and the resin tags (TAG). The contemporary self-etching primer adhesive systems overcame the inconvenient of the etch-and-rinse protocol. Studies, however, have demonstrated that HL thickness and TAG length vary according to the wetting time and additional use of acid-etching prior to self-etching primers. This study investigated the localized stress distribution in the HL and the dentin/adhesive interface. Two HL thicknesses (3 or 6 mu m), two TAG lengths (13 or 17 mu m) and two loading conditions (perpendicular and oblique-25 degrees) were investigated by the finite element (FE) analysis. Five two-dimensional FE models (M) of a dentin specimen restored with CR (38 x 64 mu m) were constructed: M1 - no HL and no TAG; M2 - 3 mu m of HL and 13 mu m of TAG; M3 - 3 mu m of HL and 17 mu m of TAG; M4 - 6 mu m of HL and 13 mu m of TAG; and M5 - 6 mu m of HL and 17 mu m of TAG. Two distributed loadings (L) (20N) were applied on CR surface: L1 - perpendicular, and L2 - oblique (25 degrees). Fixed interfacial conditions were assigned on the border of the dentin specimen. Ansys 10.0 (Ansys (R), Houston, PA, USA) software was used to calculate the stress fields. The peak of von Mises (sigma(vM)) and maximum principal stress (sigma(max)) was higher in L2 than in L1. Microstructures (HL and TAG) had no effect on local stresses for L1. Decreasing HL decreased sigma(vM) and sigma(max) in all structures for L2, but the TAG length had influence only on the peributular dentin. The thickness of HL had more influence on the sigma(vM) and sigma(max) than TAG length. The peritubular dentin and its adjacent structures showed the highest sigma(vM) and sigma(max), mainly in the oblique loading. São Paulo State Univ, Dent Sch Aracatuba, Aracatuba, SP, Brazil São Paulo State Univ, Dent Sch Aracatuba, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil Univ N Carolina, Dept Orthodont, Chapel Hill, NC USA São Paulo State Univ, Dept Restorat Dent, Dent Sch Aracatuba, Aracatuba, SP, Brazil São Paulo State Univ, Dent Sch Aracatuba, Aracatuba, SP, Brazil São Paulo State Univ, Dent Sch Aracatuba, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil São Paulo State Univ, Dept Restorat Dent, Dent Sch Aracatuba, Aracatuba, SP, Brazil
Databáze: OpenAIRE
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