A Comparison of Curing Distances and Their Effects on the Photocurability of a Sonically Activated Bulk Fill Composite System
Abstract
Recent advancements in composite resin have facilitated the development of the sonically activated bulk-fill composite system, Sonicfill 2, which its manufacturer claims can be cured to a 5mm depth. The aim of this in vitro study was to test the adequacy of polymerization with the curing light at different tip distances from the SonicFill 2 composite resin, in a posterior class I occlusal restoration. The null hypothesis was that adequate polymerization will only occur at the 0mm tip distance, and the remaining tip distances will result in inadequate polymerization. Eighty samples of the SonicFill 2 bulk fill composite resin were created using shade A3 at a 5mm depth. All samples were cured for 20 seconds using the Demi Plus curing light at a tip distance of 0mm, 2mm, 4mm, or 6mm. Each of the curing distance groups contained 20 samples. The hardness of the top and bottom sides were determined and compared to assess the polymerization of each group. None of the curing groups achieved the desired threshold of at least an 80 bottom/top KHN ratio. Data revealed a significant effect of curing distance on bottom side hardness, as well as significant differences between each of the curing distances, with the hardness significantly decreasing on the bottom side as the tip distance increased. The results of the investigation suggest that adequate polymerization of the Sonicfill 2 system does not occur at a depth of5mm when the composite is cured from the occlusal surface only for 20 seconds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2018
- Accession Number
- AD1128177
Entities
People
- Michael J. Browning
Organizations
- Uniformed Services University of the Health Sciences