%0 Journal Article
%T Curing effectiveness of single-peak and multi-peak led light curing units on tpo-containing resin composites with different chromatic characteristics
%A A. BROTZU
%A A. FABIANELLI
%A G. CONTE
%A L. CIANCONI
%A M. MANCINI
%A M. PANETTA
%A R. SORGE
%J Archive of "Oral & Implantology".
%D 2017
%R 10.11138/orl/2017.10.2.140
%X This study evaluated the surface microhardness of Lucirin-TPO (TPO) containing resin based composite (RBC) cured with three light-emitting diode (LED) light curing units (LCUs) (two single-peak LED and one multi-peak LED), and two different energy density (ED) (8 J/cm2 and 16 J/cm2). Ninety specimens (8 mm wide and 2 mm thick) (n=5), were prepared with three different shades: translucent (T), A2 dentin (A2d), and A4 dentin (A4d). Specimens were subjected to micro-hardness Vickers measurements (Vickers Hardness Number, VHN) on both top and bottom surfaces. Hardness ratio (rHV) was also calculated. Data were analyzed using multifactorial ANOVA and Bonferroni tests (<=0.05). Results indicated that higher ED performed better than lower ED. Multi-peak LED achieved higher VHNs and rHV than single-peak LED when curing a TPO-containing RBC. A4d invariably achieved lower rHV and VHN than T and A2d. Single-peak LED achieved comparable VHNs and rHVs with multi-peak LED only curing A2d and T shades with 16J/cm2
%K resin composite
%K LED
%K shade
%K lucirin TPO
%K microhardness
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5965074/