Khulood Al-mansour, Attika Al-sada, Hanan Al-sinan.
Curing depth of bulk - fill composites - an in-vitro study.
Pak Oral Dental J Jan ;35(2):270-4.

The aim of this in-Vitro study to evaluate the depth of cure of Tetric EvoCeram® Bulk Fill Composite and Tetric N-Ceram® Bulk Fill Composite nano-hybrid low-shrinkage resin based composite materials using the Vickers hardness test. Specimens were fabricated in 4 mm bulk depth and 10 mm width and each sample was light cured using blue phase- G2 light cure device, then finished and polished using Sof-Lex™ disks. Specimens were immersed in ultrasonic bath with distilled water for two minutes and kept inside an oven at 37°C for 24 hours. Thereafter, the top and bottom surfaces of each specimen were subjected to the Vickers hardness testing machine. The hardness was measured in three different indentations in the top and bottom surfaces for each sample. Data were collected and analyzed using independent T-test. The bottom-to-top ratio of the surface-hardness for both materials was over 80% which indicates that the bottom surfaces were adequately cured. This study showed that adequate curing of the samples was possible up to a depth of 4mm with no significant differences between both types of nano-hybrid low-shrinkage bulk fill resin based composite materials.

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