title: The influence of elastic moduli of core materials on shear stress distributions at the adhesive interface in resin built-up teeth.
abstract: This study aimed to investigate shear stress distributions in resin built-up teeth using resin composites of varying elastic moduli (E), with or without fiber posts. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and cores were built-up with resin composites of three different E: 12,000, 18,000 and 24,000 MPa, with or without fiber posts. Finite element linear analysis was performed to calculate shear stress distributions at bonding interface between resin core and dentin. Regardless of fiber post insertion, the shear stress on the cervical surface of resin core decreased as the E of resin composites increased. Insertion of fiber posts increased the shear stress on the post surface of resin core, with increases in the E of resin composites. In conclusion, using resin core materials with higher E decreased the shear stress at cervical interface between resin core and dentin regardless of fiber post insertion.
authors.affiliation: Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Chiba
authors.forename: Takashi
authors.initials: T
authors.lastname: Hatayama
authors.forename: Kimisuke
authors.initials: K
authors.lastname: Kainose
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Nakajima
authors.forename: David H
authors.initials: DH
authors.lastname: Pashley
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Wakabayashi
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000269:Adhesives; D003188:Composite Resins; D003804:Dentin; D055119:Elastic Modulus; D005898:Glass; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D013314:Stress, Mechanical
chemical_list: D000269:Adhesives; D003188:Composite Resins; D019279:Resin Cements