Effect of exposure time and pre-heating on the conversion degree of conventional, bulk-fill, fiber reinforced and polyacid-modified resin composites

• Published in: Dental materials 2019-02, Vol.35 (2), p.217-228
• Main Authors: Lempel, Edina, Őri, Zsuzsanna, Szalma, József, Lovász, Bálint Viktor, Kiss, Adél, Tóth, Ákos, Kunsági-Máté, Sándor
• Format: Article
• Language: English
• Subjects: Conversion; Curing; Data processing; Degree of conversion; Dental restorative materials; Dentistry; Exposure; Exposure time; Fiber composites; Fiber reinforced polymers; Heating; Polyacids; Polymer matrix composites; Pre-heating; Raman spectroscopy; Resin based composite; Variance analysis; Viscosity
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2018.11.017

To determine the degree of conversion (DC) of different type of resin-based composites (RBC) in eight-millimeter-deep clinically relevant molds, and investigate the influence of exposure time and pre-heating on DC. Two-millimeter-thick samples of conventional sculptable [FiltekZ250 (FZ)], flowable [Filtek Ultimate Flow (FUF)] and polyacid-modified [Twinky Star Flow (TS)] RBCs, and four-millimeter-thick samples of flowable bulk-fill [Filtek Bulk Fill Flow (FBF), Surefil SDR (SDR)] and sculptable fibre-reinforced [EverX Posterior (EX)] RBCs were prepared in an eight-millimeter-deep mold. The RBCs temperature was pre-set to 25, 35 and 55°C. The RBCs were photopolymerized with the recommended and its double exposure time. The DC at the top and bottom was measured with micro-Raman spectroscopy. Data were analyzed with ANOVA and Scheffe post-hoc test (p