Residual monomer of reline acrylic resins - Effect of water-bath and microwave post-polymerization treatments


Autoria(s): Urban, Vanessa M.; Machado, Ana Lucia; Oliveira, Regina V.; Vergani, Carlos Eduardo; Pavarina, Ana Claudia; Cass, Quezia B.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/03/2007

Resumo

Objectives. This study compared the residual monomer (RM) in four hard chair-side reline resins (Duraliner II-D, Kooliner-K, Tokuso Rebase Fast-TRF and Ufi Gel hard-UGH) and one heat-polymerized denture base resin (Lucitone 550-L), which was processed using two polymerization cycles (short-LS and long-LL). It was also investigated the effect of two after polymerization treatments on this RM content.Methods. Specimens (n = 18) of each material were produced following the manufacturers' instructions and then divided into three groups. Group I specimens were left untreated (GI-control). Specimens of group II (GII) were given post-polymerization treatment by microwave irradiation. In group III (GIII), specimens were submitted to immersion in water at 55 degrees C (reline resins-10 min; denture base resin L-60min). The RM was analyzed using high performance liquid chromatography (HPLC) and expressed as a percentage of RM. Data were analyzed by two-way ANOVA followed by Tukey's test (alpha = 0.05).Results. Comparing control specimens, statistical differences were found among all materials (p < 0.05), and the results can be arranged as K (1.52%) > D (0.85%) > UGH (0.45%) > LL (0.24%) > TRF (0.14%) > LS (0.08%). Immersion in hot water (GIII) promoted a significant (p < 0.05) reduction in the RM for all materials evaluated compared to control (GI), with the exception of LL specimens. Materials K, UGH and TRF exhibited significantly (p < 0.05) lower values of RM after microwave irradiation (GII) than in the control specimens.Significance. The reduction in RM promoted by water-bath and microwave post-polymerization treatments could improve the mechanical properties and biocompatibility of the relining and denture base materials. (c) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Formato

363-368

Identificador

http://dx.doi.org/10.1016/j.dental.2006.01.021

Dental Materials. Oxford: Elsevier B.V., v. 23, n. 3, p. 363-368, 2007.

0109-5641

http://hdl.handle.net/11449/34211

10.1016/j.dental.2006.01.021

WOS:000244238700013

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Dental Materials

Direitos

closedAccess

Palavras-Chave #acrylic resin #residual monomer #post-polymerization treatment #HPLC
Tipo

info:eu-repo/semantics/article