Original scientific paper
https://doi.org/10.15644/asc52/3/4
Toxicity of Pre-heated Composites Polymerized Directly and Through CAD/CAM Overlay
Alena Knezevic
; Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, US
Davor Zeljezic
; Mutagenesis Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
Nevenka Kopjar
; Mutagenesis Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
Sillas Duarte, Jr.
; Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, US
Matej Par
; Private Dental Practice, Dankovecka 9, 10040 Zagreb, Croatia
Zrinka Tarle
; Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Abstract
Objectives: The aim was to compare cytotoxicity/genotoxicity of pre-heated composites polymerized through CAD/CAM overlays on isolated human peripheral blood lymphocytes. Material and Methods: A microhybrid (Z100, 3M ESPE) and nanofilled composite (Filtek Supreme Ultra, 3M ESPE) were heated in a heating unit (Calset, AdDent Inc.) at different temperatures: 37 oC, 54 oC, and 68 oC. A small amount of heated composite was placed in a cylindrical mold (6mm diameter; 0.65mm thick), covered with a Mylar sheet, pressed and light-cured directly and through 2 mm thick CAD/CAM ceramic-reinforced polymer (CRP)(LAVA Ultimate, 3M ESPE) or CAD/CAM lithium disilicate ceramic
(LDC)(e.max, Ivoclar/Vivadent) overlay. After curing, the specimens were immediately placed in a prepared lymphocyte cell culture. Cytotoxicity was assessed using a dye exclusion method by simultaneous staining with ethidium bromide and acridine orange, aimed to determine percentages of viable, apoptotic and necrotic cells. Genotoxicity was studied using alkaline comet assay. Results: For Z100, the highest percentage of viable cells is recorded at T1 (93.7%) after direct light curing, followed by light curing through CRP (92.3%) and through LDC (91.7%T1,T3). For Filtek Supreme Ultra, the highest percentage of viable cells is recorded while curing through CRP (91.0% T2), followed by LDC (90% T1,T3) and direct light curing (88.7%T2). Conclusion: For both tested materials, preheating the procedure at T1 and T2 may be the procedure of choice. In terms of genotoxicity, reheating at T3 may not be suggested.
Keywords
Composite resins; cytotoxicity; genotoxicity; dental light curing units
Hrčak ID:
205657
URI
Publication date:
17.9.2018.
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