A Sahafi1, A Peutzfeldt, E Asmussen. 1. Department of Dental Materials, School of Dentistry, University of Copenhagen, Denmark.
Abstract
PURPOSE: To determine the effect of soft-start polymerization of resin-based composites on the marginal gap formation in dentin cavities. MATERIALS AND METHODS: Cylindrical cavities were prepared in dentin in extracted human molars. The cavities were distributed into 8 groups. The teeth in groups 1-4 were treated with Scotchbond Multi-Purpose and restored with Z100, and the teeth in groups 5-8 were treated with OptiBond FL and restored with Herculite XRV. The restorations were light-cured for 40 s by four different curing modes. The marginal gap formation was measured in a light microscope after a 20 min water-storage, and the wall-to-wall contraction was calculated as the widest gap in percent of the cavity diameter. RESULTS: Soft-start light curing did not influence wall-to-wall contraction in dentin cavities. OptiBond FL and Herculite XRV showed less wall-to-wall contraction than did Scotchbond Multi-Purpose and Z100. CLINICAL SIGNIFICANCE: The soft-start polymerization procedures studied did not improve the marginal adaptation of two resin composites bonded to dentin cavities compared with conventional polymerization.
PURPOSE: To determine the effect of soft-start polymerization of resin-based composites on the marginal gap formation in dentin cavities. MATERIALS AND METHODS: Cylindrical cavities were prepared in dentin in extracted human molars. The cavities were distributed into 8 groups. The teeth in groups 1-4 were treated with Scotchbond Multi-Purpose and restored with Z100, and the teeth in groups 5-8 were treated with OptiBond FL and restored with Herculite XRV. The restorations were light-cured for 40 s by four different curing modes. The marginal gap formation was measured in a light microscope after a 20 min water-storage, and the wall-to-wall contraction was calculated as the widest gap in percent of the cavity diameter. RESULTS: Soft-start light curing did not influence wall-to-wall contraction in dentin cavities. OptiBond FL and Herculite XRV showed less wall-to-wall contraction than did Scotchbond Multi-Purpose and Z100. CLINICAL SIGNIFICANCE: The soft-start polymerization procedures studied did not improve the marginal adaptation of two resin composites bonded to dentin cavities compared with conventional polymerization.
Authors: Vilhelm G Ólafsson; André V Ritter; Edward J Swift; Lee W Boushell; Ching-Chang Ko; Gabrielle R Jackson; Sumitha N Ahmed; Terence E Donovan Journal: J Esthet Restor Dent Date: 2017-10-16 Impact factor: 2.843