Abstract
AIM: To evaluate the influence of plaster condition, dry or not, on the amount of residual monomer in heat-cured acrylic resin. METHODS: Thirty acrylic resin specimens (65x10x3 mm) were fabricated and randomly assigned to 5 groups (n=6). The evaluated resins were heat-cured acrylic resins by conventional or microwave polymerization techniques and the plaster was previously dried in microwave oven in two groups. Each specimen was individually immersed in a test tube containing methanol (7 days) for surface analysis. In the groups for which internal monomer was evaluated, the specimens were fragmented and the small fragments were weighed prior to immersion in methanol. The analysis was made by high performance liquid chromatography (HPLC). Data were analyzed by ANOVA and Tukey test (p<5%) RESULTS: showed statistical differences among the groups. CONCLUSIONS: The previous plaster drying influenced the residual monomer amount showing a decrease of these levels.
Highlights
Received for publication: February 04, 2013 Accepted: March 21, 2013Correspondence to: Tarcisio José de Arruda Paes-Junior Avenida José Longo, 777, São Dimas CEP: 12245-000 - São José dos Campos, SP, BrasilBraz J Oral Sci. 12(2):[84-89]Several materials have been consolidated due to their broad use in several areas of dentistry[1]
Rectangular stainless steel bars (12.6X67.0x3.0 mm) with sharp edges was included in fiberglass reinforced microwave flask (VIPI-STG; Dental-Vipi Ltda.), which was used in the hot water bath in the conventional technique of acrylic resin polymerization
Several studies have been focusing on this analysis by considering the influence of aspects such as methods and polymerization cycles and storage time of the polymerized material[14,15]
Summary
Received for publication: February 04, 2013 Accepted: March 21, 2013Correspondence to: Tarcisio José de Arruda Paes-Junior Avenida José Longo, 777, São Dimas CEP: 12245-000 - São José dos Campos, SP, BrasilBraz J Oral Sci. 12(2):[84-89]Several materials have been consolidated due to their broad use in several areas of dentistry[1]. Acrylic resin is one of the most typical examples, which since the 1940’s has been established as the material of choice in the preparation of prosthetic works, such as complete and partial removable dentures[2]. Advantages such as biocompatibility, no taste and odor, adequate thermal properties, dimensional stability, and simple technique are prevalent in these indications[3,4]. Those authors demonstrated that microwaves cause the molecules of the acrylic resin (monomer) to vibrate with higher frequency, creating friction and the heat that triggers the polymerization[5]
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