Ivocerin is a new germanium-based light-initiator developed and patented by Ivoclar Vivadent and used exclusively in Tetric EvoCeram Bulk Fill. This new initiator allows Tetric EvoCeram Bulk Fill to cure faster and deeper than other composite materials without having to increase translucency or reduce working time. The absorption spectrum of Ivocerin fills the “gap” between traditional light-initiators (e.g. Camphorquinone, Lucerin TPO, PPD) used in today’s composite materials (Fig 1. & Video 1) It not only cures fast, it cures well beyond the 2 mm limit of traditional initiators achieving an efficient depth-of-cure at 4 mm (Fig 2).
How can other manufacturers also claim depth-of-cure beyond 2 mm for their “bulk fill” materials?
There are other ways to increase the depth-of-cure of composite materials. However these options can result in compromises to other attributes. Two common options used by other manufacturers to increase depth-of-cure are:
|Increase translucency||Reduced esthetics – When placing highly translucent materials in “bulk” layers, the value will be reduced and the composite will appear gray. This can be accentuated by staining or discoloration of underlying tooth structure.|
|Increase content of traditional light-initiators||Reduced working time – When increasing the amount of light-initiators, the material will become much more reactive to ambient light. This may require the need to turn overhead working lights away to keep the material from polymerizing too fast, and to extend the working time necessary to contour the anatomy of the restoration.|