title: Marginal behaviour of self-etch adhesive/composite and combined amalgam-composite restorations.
abstract: The aim of this study was to compare the marginal and internal adaptation in self-etching adhesive (SEA)/composite restorations with combined amalgam-resin-based composite restorations in the proximal box with and without bonding agent beneath amalgam both before and after load-cycling. Class II restorations, were manufactured as following a) Bonding agent (Clearfil Liner Bond 2V, Kuraray) beneath amalgam (Tytin, SDS Kerr) and resin-based composite (Clearfil APX, Kuraray) with SEA, b) Amalgam without bonding agent and resin-based composite with SEA and c) Resin-based composite with SEA. Each group divided into two equal subgroups (n=8). Marginal and internal adaptation of first subgroup evaluated after 7-day water storage and of the second after load-cycling in chewing simulator for 1.2 x 10(6) cycles. Marginal and internal adaptation at cervical and amalgam-composite sites evaluated by videomicroscope and ranked as "excellent"/"non-excellent". Slices of restorations examined under optical microscope to determine the quality of bonding layer. Defects in cervical adaptation observed in the three restorative techniques examined prior loading. Amalgam-composite combination in proximal surface provided comparable marginal and internal adaptation results at cervical wall, to self-etching-composite combination. Portion (25-37.5%) of amalgam-resin-based composite interfaces in proximal box presented no perfect sealing. The application of bonding agent beneath amalgam resulted in relatively inferior cervical adaptation. Loading resulted in fewer excellent restorations in all three restorative techniques but not in a statistically significant level.
authors.affiliation: Department of Operative Dentistry, Faculty of Dentistry, University of Athens, Athens, Greece. nikos.kournetas@gmail.com
authors.forename: Nikos
authors.initials: N
authors.lastname: Kournetas
authors.forename: Afrodite
authors.initials: A
authors.lastname: Kakaboura
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Giftopoulos
authors.forename: Magdad
authors.initials: M
authors.lastname: Chakmachi
authors.forename: Christos
authors.initials: C
authors.lastname: Rahiotis
authors.forename: J
authors.initials: J
authors.lastname: Geis-Gerstorfer
mesh_terms: D001641:Bicuspid; D003188:Composite Resins; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D019279:Resin Cements; D019237:Tooth Cervix
chemical_list: D003188:Composite Resins; D019279:Resin Cements; D003723:Dental Amalgam