Post-cure depth of cure of bulk fill dental resin-composites

• Published in: Dental materials 2014-02, Vol.30 (2), p.149-154
• Main Authors: Alrahlah, A, Silikas, N, Watts, D.C
• Format: Article
• Language: English
• Subjects: Acrylic Resins; Advanced Basic Science; Bulk fill; Composite Resins; Dental Bonding; Dentistry; Depth of cure; Humans; Microhardness; Polyurethanes; Post and Core Technique; Post-cure; Resin composites
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2013.10.011

Abstract Objectives To determine the post-cure depth of cure of bulk fill resin composites through using Vickers hardness profiles (VHN). Methods Five bulk fill composite materials were examined: Tetric EvoCeram® Bulk Fill, X-tra base, Venus® Bulk Fill, Filtek™ Bulk Fill, SonicFill™. Three specimens of each material type were prepared in stainless steel molds which contained a slot of dimensions (15 mm × 4 mm × 2 mm), and a top plate. The molds were irradiated from one end. All specimens were stored at 37 °C for 24 h, before measurement. The Vickers hardness was measured as a function of depth of material, at 0.3 mm intervals. Data were analysed by one-way ANOVA using Tukey post hoc tests ( α = 0.05). Results The maximum VHN ranged from 37.8 to 77.4, whilst the VHN at 80% of max.VHN ranged from 30.4 to 61.9. The depth corresponding to 80% of max.VHN, ranged from 4.14 to 5.03 mm. One-way ANOVA showed statistically significant differences between materials for all parameters tested. SonicFill exhibited the highest VHN ( p < 0.001) while Venus Bulk Fill the lowest ( p ≤ 0.001). SonicFill and Tetric EvoCeram Bulk Fill had the greatest depth of cure (5.03 and 4.47 mm, respectively) and was significant's different from X-tra base, Venus Bulk Fill and Filtek Bulk Fill ( p ≤ 0.016). Linear regression confirmed a positive regression between max.VHN and filler loading ( r2 = 0.94). Significance Bulk fill resin composites can be cured to an acceptable post-cure depth, according to the manufacturers’ claims. SonicFill and Tetric EvoCeram Bulk Fill had the greatest depth of cure among the composites examined.