|Baltic Dental and Maxillofacial Journal|
December, 2012, Vol. 14, No. 4
Evaluation of Mechanical Properties on three Nanofilled Composites
© 2012 Stomatologija
Stomatologija 2012; 14 (4): 103-7 244 KB
Evaluation of inorganic particles of composite resins with nanofiller content
Eduardo Gonçalves Mota, Lucas Hörlle, Hugo Mitsuo Oshima, Luciana Mayumi Hirakata
The purposes of this study were evaluate by energy dispersed X-ray (EDS) and scanning electron microscopy (SEM) the inorganic particles of three nanofilled composite resins, comparing particles sizes, shape and composition, and the filler weight content by thermogravimetric analyzes (TGA). Three composite resins classified as nanofilled were selected to this study: Esthet-X; Grandio; Filtek Supreme XT. The shade was standardized (A2) for enamel (E) or dentin (D). Ten samples with 20 mg (±10 mg) of each composite resin were submitted to thermogravimetric analyzes (TGA) in order to record the filler weight content (wt%). The amount of inorganic phase ranged from 75.75 to 87 wt%, to Esthet-X (D) and Grandio (D), respectively. The filler composition was analyzed by energy dispersed X-ray (EDS), and the size and shape were evaluated by scanning electron microscopy (SEM). The filler average size (µm) obtained by SEM were: Esthet-X (E) 1.16; Esthet-X (D) 1.39; Filtek Supreme XT (E) 0.6 (nanocluster); Filtek Supreme XT (D) 1.14 (nanocluster); Grandio (E) 2.05 and Grandio (D) 3.1. Silica (SiO2), Ba and Al were observed through EDS. The shape of Esthet-X and Grandio fillers showed similar characteristics with high quantity of irregular inorganic particles and heterogeneous filler. However, Filtek Supreme XT showed spherical and regular particles with homogeneous distribution and sizes. Based in the analysis of nanofilled composites inorganic phase, inconsistencies of weight content, composition, shape and size can be stated between the literature and manufacturer’s instructions.
Key words: dental materials, nanotechnology, fillers, composite resin.
Received: 09 09 2009
Accepted for publishing: 21 12 2012
*Pontifical Catholic University of Rio Grande do Sul, Porto Alegre Brazil
Eduardo Gonçalves Mota* – DDS, MS, PhD, assoc. prof.
Address correspondence to Dr. Eduardo Gonçalves Mota, Av. Ipiranga, 6681 - Building 6, Porto Alegre - Rio Grande do Sul, Brazil