A Comparison of Curing Distances and Their Effects on the Photocurability of 3M Filtek One Bulk Fill Restorative
Abstract
Objective: To compare the hardness of 5mm-depth samples of the bulk-filled composite resin, 3M Filtek One Bulk Fill, at different tip distances of 0mm, 2mm, 4mm and 6mm after curing for 20 seconds with an Acteon Mini LED curing light. The Knoop hardness test (KNH) was used to measure the hardness and ultimately evaluate the curability and polymerization of each sample. Material and Methods: A 5mm deep x 5mm wide mold was used to create samples using 3M Filtek One Bulk Fill composite resin in shade. Twenty specimens were prepared for each group representing a 0-, 2-, 4-, and 6mm curing tip distance for a total of 80 samples. Samples were cured for 20 seconds with an Acteon Mini LED curing light system before being tested for hardness using the KNH. Each sample was measured at five locations (center, north, south, east, and west) on both the top and bottom surfaces, for a total of 800 hardness assessments using the Leco LM300 series microindentation hardness testing system. For each specimen, bottom/top KNH ratios were compared to the industry standard of 80% hardness to verify a clinically adequate depth of cure in relation to the manufacturers recommended guidelines. Each sample was tested immediately after preparation. Results: None of the groups achieved the desired threshold of at least an 80% bottom/top KHN ratio. Conclusion: An acceptable hardness when using 3M Filltek One Bulk Fill composite resin in 5mm-depth samples was not achieved, regardless of tip distance, when cured for 20 seconds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 14, 2019
- Accession Number
- AD1127934
Entities
People
- Thomas Beltran
- Yunsung Hong
Organizations
- Womack Army Medical Center