title: Influence of elasticity on gap formation in a lining technique with flowable composite.
abstract: The purpose of this study was to investigate the effect of flowable composites as liners for direct composite restorations, with key focus on the elastic moduli of flowable and condensable composites. After treating the composite mold cavity surface with an adhesive system, one of the flowable composites was placed as a 1 mm-thick layer on the cavity floor and irradiated for 20 seconds. The rest of cavity was subsequently filled with a condensable composite and irradiated for 40 seconds. Gap formation at both interfaces--between the cavity floor and flowable composite, and between the flowable and condensable composites--was examined. No gaps were detected at the interface between the cavity floor and flowable composite. Gap percentage at the interface between the flowable and condensable composites was dependent on the difference in elastic modulus. It was concluded that flowable composite with high elastic modulus could inhibit gap formation between flowable and condensable composites.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Japan. cho.ope@tmd.ac.jp
authors.forename: Eitetsu
authors.initials: E
authors.lastname: Cho
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Chikawa
authors.forename: Ryuzo
authors.initials: R
authors.lastname: Kishikawa
authors.forename: Norimichi
authors.initials: N
authors.lastname: Inai
authors.forename: Masayuki
authors.initials: M
authors.lastname: Otsuki
authors.forename: Richard M
authors.initials: RM
authors.lastname: Foxton
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003736:Dental Cavity Lining; D018772:Dental Marginal Adaptation; D004548:Elasticity; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes