title: Bulk filling of Class II cavities with a dual-cure composite: Effect of curing mode and enamel etching on marginal adaptation.
abstract: OBJECTIVE
  This study attempted to find a simple adhesive restorative technique for class I and II cavities on posterior teeth.
  
  
  METHODS
  The tested materials were a self-etching adhesive (Parabond, Coltène/Whaledent) and a dual-cure composite (Paracore, Coltène/Whaledent) used in bulk to restore the cavities. Class II MO cavities were performed and assigned to 4 groups depending on the orthophosphoric acid (H3PO4) conditioning of enamel and polymerization method used (chemical or dual). Specimens were subjected to quantitative marginal analysis before and after thermo-mechanical loading.
  
  
  RESULTS
  Higher percentages of marginal adaptation at the total margin length, both before and after thermo-mechanical loading, were found in groups in which enamel was etched with phosphoric acid, without significant differences between the chemically and dual-cured modes. The restorations performance was similar on enamel and dentin, obtaining low results of adaptation on occlusal enamel in the groups without enamel etching, the lowest scores were on cervical dentin in the group with no ortophosphoric acid and self-cured.
  
  
  CONCLUSIONS
  A dual-cure composite applied in bulk on acid etched enamel obtained acceptable marginal adaptation results, and may be an alternative technique for the restoration of class II cavities. Key words:Dual-cure composite, bulk technique, class II restoration, selective enamel etching, marginal adaptation.
authors: DDS, MsC, Master Esthetic Dentistry. Universitat Internacional de Catalunya, Department of Operative Dentistry and Endodontics, Sant Cugat del Valles, Barcelona, Spain.
authors: Jose
authors: J
authors: Bahillo
authors: Dr. Med. Dent., PhD, Senior Lecturer. Division of Cariology and Endodontology, School of Dentistry, University of Geneva, Geneva, Switzerland.
authors: Tissiana
authors: T
authors: Bortolotto
authors: MD, DDS, PhD, Professor and Director. Department of Restorative Dentistry and Endodontics, School of Dentistry, Universitat Internacional de Catalunya, Sant Cugat del Valles, Barcelona, Spain.
authors: Miguel
authors: M
authors: Roig
authors: Prof. Dr. Med. Dent., Professor and Chairman. Division of Cariology and Endodontology, President, School of Dentistry, University of Geneva, Geneva, Switzerland.
authors: Ivo
authors: I
authors: Krejci