Degradation of a dental filling material after high caries challenge

• Main Authors: Márcio Antonio Paraizo, Luis Claudio Mendes, Ailton de Souza Gomes, Mauro Sayão de Miranda, Ana Claudia Fernandes Amaral
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2004-12-01
• Series: Materials Research
• Subjects: Composite resin; Degradation; HPLC; Contact angle
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000400020

New types of copolymers using monomers which form inorganic polymers network (glass-like) and organic networks have been developed, known as ormocers. The aim of this work was to study how a particular dental filling material is degraded when subjected to a caries challenge by using low pH solutions. The supernadants were studied by HPLC to detect the presence of molecules from the resin, while the changes of the material surface were evaluated by contact angle. An organic modified ceromer (ormocer) called Definite® (Degussa ) was tested. Samples were built following manufacturer's instructions. After pH cycles, solutions were injected in a HPLC. The contact angle was obtained using a goniometer after and before the cycles. HPLC results showed material degradation, only detected in acid solutions. Bis-GMA and TEGDMA were detected in Definite® residues. Means and S.D. of contact angle were (p < 0,05): baseline: 85.16&deg; &plusmn; 3.90&deg; and after pH cycles: 69.77&deg; &plusmn; 7.12&deg;. The authors concluded that an ormocer filling material degraded on a caries simulated environment.