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Lookup NU author(s): Dr Bana Abdulmohsen
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Objectives. To develop two experimental temporary crown and bridge materials with improved physicomechanical properties.Methods. Commercial materials: Trim (TR, monomethacrylate, Bosworth) and Quicktemp2 (QT, dimethacrylate, Schottlander). Experimental materials: isobutyl methacrylate/poly(ethyl methacrylate) (IBMA/PEM) and n-butyl methacrylate/PEM (nBMA/PEM), both monomethacrylates. For water absorption/desorption studies rectangular samples (40 mm x 10 mm x 1 mm) of each material were prepared, immersed in deionized water (DW, control) and artificial saliva (AS), and weighed at regular time intervals. %solubility and diffusion coefficients (D) for uptake/loss processes were calculated and compared with theoretical predictions. Polymerization exotherm (cylindrical samples 10 mm x 18 mm) and flexural moduli were measured (three point bending; rectangular samples 80 mm x 10 mm x 4 mm, dry and after 9 days storage in DW). The data were compared statistically.Results. QT and nBMA/PEM had lower %equilibrium uptakes/loss in DW (0.68%/0.884% and 0.64%/0.895% respectively). QT had the lowest water absorption/desorption D (P < 0.05) compared to the three monomethacrylates, in DW and AS. %solubility for all systems showed no differences in DW (P > 0.05), but a difference for QT in AS (P < 0.05). QT reached its maximum temperature rapidly (similar to 2 min; 3 monomethacrylates similar to 7-13 min). The commercial materials exhibited high peak temperatures (similar to 51 degrees C, P <0.05; experimental materials similar to 43 degrees C). QT had a higher flexural modulus (similar to 4 GPa; 3 monomethacrylates similar to 0.7-1 GPa) for dry and wet samples. The moduli for commercial materials reduced significantly after immersion in DW; there was no difference between the dry and wet experimental materials samples (P > 0.05).Significance. The experimental materials merit further studies since they presented with lower setting exotherms, and contained no phthalate plasticizer, thus being less of a risk to patients. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Author(s): Abdulmohsen B, Parker S, Braden M, Patel MP
Publication type: Article
Publication status: Published
Journal: Dental Materials
Print publication date: 01/02/2016
Online publication date: 31/12/2015
Acceptance date: 30/11/2015
ISSN (print): 0109-5641
ISSN (electronic): 1879-0097
Publisher: Elsevier Science Ltd.
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