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      Influence of plaster drying on the amount of residual monomer in heat-cured acrylic resins

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          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.

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          Treatment methods for fractures of the mandibular angle.

          Edward Ellis (1999)
          Fractures of the mandibular angle are plagued with the highest rate of complication of all mandibular fractures. Over the past 10 years, various forms of treatment for these fractures were performed on an indigent inner city population. Treatment included: 1) closed reduction or intraoral open reduction and non-rigid fixation; 2) extraoral open reduction and internal fixation with an AO/ASIF reconstruction bone plate; 3) intraoral open reduction and internal fixation using a solitary lag screw; 4) intraoral open reduction and internal fixation using two 2.0 mm mini-dynamic compression plates; 5) intraoral open reduction and internal fixation using two 2.4 mm mandibular dynamic compression plates; 6) intraoral open reduction and internal fixation using two non-compression miniplates; 7) intraoral open reduction and internal fixation using a single non-compression miniplate; and 8) intraoral open reduction and internal fixation using a single malleable non-compression miniplate. This paper reviews the results of those modes of treatment when used for the same patient population at one hospital. Results of treatment show that, in this patient population, the use of either an extraoral open reduction and internal fixation with the AO/ASIF reconstruction plate or intraoral open reduction and internal fixation, using a single miniplate, are associated with the fewest complications.
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            Residual monomer of reline acrylic resins. Effect of water-bath and microwave post-polymerization treatments.

            Douglas Oliveira, Pedro L O A Machado, A C Pavarina … (2007)
            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. 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-60 min). 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). Comparing control specimens, statistical differences were found among all materials (p 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. 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.
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              Effect of water-bath post-polymerization on the mechanical properties, degree of conversion, and leaching of residual compounds of hard chairside reline resins.

              V De Brito Poveda, V Urban, A C Pavarina … (2009)
              This study evaluated the effect of water-bath post-polymerization at 55 degrees C for 10 min (WB) on the content and leaching of residual compounds, degree of conversion, flexural strength, and hardness of hard chairside reline resins (Kooliner: K, New Truliner: N, Ufi Gel hard: U, and Tokuso Rebase Fast: T). Leaching experiments were made by storing specimens (n=48) in artificial saliva at 37+/-1 degrees C and analyzing residual monomers and plasticizer by HPLC. Analysis of residual monomer and plasticizer content (n=48) was also made by HPLC. Degree of conversion (n=40) was analyzed by using FT-Raman spectroscopy. A 3-point loading test was used to evaluate the flexural strength of the specimens (n=80). One fragment of each flexural test specimen was then submitted to Vickers microhardness test. WB produced a significant decrease (p<0.050) in the amount of residual compounds eluted from the materials within the first hour of immersion. With the exception of material U, WB decreased the duration of release of the residual compounds evaluated. All materials evaluated exhibited significantly (p<0.050) lower values of residual monomer and plasticizer (material N) after WB compared with the control groups. WB increased the degree of conversion of K and T resins and the hardness of N, K, and T resins (p<0.050). Only material K showed an increase in flexural strength after WB (p<0.050). Immersion of relined dentures in water at 55 degrees C for 10 min can be used to reduce the amounts and duration of release of residual compounds and improve mechanical properties of some of the materials evaluated.
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                Author and article information

                Contributors
                Tarcisio José de Arruda Paes-Junior: Role: ND
                Rodrigo Furtado de Carvalho: Role: ND
                Sâmia Carolina Mota Cavalcanti: Role: ND
                Guilherme de Siqueira Ferreira Anzaloni Saavedra: Role: ND
                Alexandre Luiz Souto Borges: Role: ND
                Journal
                Journal ID (publisher-id): bjos
                Title: Brazilian Journal of Oral Sciences
                Abbreviated Title: Braz. J. Oral Sci.
                Publisher: Faculdade de Odontologia de Piracicaba - UNICAMP (Piracicaba, SP, Brazil )
                ISSN (Print): 1677-3217
                ISSN (Electronic): 1677-3225
                Publication date (Print and electronic): June 2013
                Volume: 12
                Issue: 2
                Pages: 84-89
                Affiliations
                [01] São José dos Campos SP orgnameUniv Estadual Paulista orgdiv1Institute of Science and Technology orgdiv2School of Dentistry Brazil
                Article
                Publisher ID: S1677-32252013000200003
                DOI: 10.1590/S1677-32252013000200003
                SO-VID: a531e70e-3588-441a-85fd-4c445b52a69d
                License:

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                Date received : 04 February 2013
                Date accepted : 21 March 2013
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 6
                Product

                SciELO Brazil

                Categories
                Subject: Original Articles

                Keywords: acrylic resins,chromatography,laboratory research,polymers
                Data availability:
                Keywords: acrylic resins, chromatography, laboratory research, polymers

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