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Effect of thixotropic agents as additives on the mechanical properties of maxillofacial silicone elastomers

Bibars, Abdel Rahim M., Al-Hourani, Zeid, Khader, Yousef and Waters, Mark 2018. Effect of thixotropic agents as additives on the mechanical properties of maxillofacial silicone elastomers. Journal of Prosthetic Dentistry 119 (4) , pp. 671-675. 10.1016/j.prosdent.2017.06.014

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Abstract

Statement of problem The incorporation of thixotropic agents to prevent slumping during the silicone packing procedure may alter some favorable mechanical properties of the silicone elastomers and could possibly influence the success of the prosthesis. Purpose The purpose of this in vitro study was to evaluate the effect of adding thixotropic agents on the mechanical properties of 3 commonly used silicone elastomers. Material and methods Specimens of 3 maxillofacial silicones (M511, Z004; Technovent Ltd, and A2000; Factor II Inc) were prepared according to the manufacturers’ instructions. Tear and tensile strength values and percentages of elongation and hardness were evaluated for each material with and without thixotropic agents. Data were analyzed using 1-way ANOVA and the Bonferroni post hoc test (α=.05). Results Results showed that the 3 types of silicone elastomers had significantly different (P<.001) tensile and tear strength and hardness values and percentages of elongation. Z004 silicone showed the highest tensile and tear strength followed by A2000 and M511, regardless of the addition of thixotropic agent. The addition of a thixotropic agent decreased the tear strength (P<.001) but not the tensile strength for all types of silicone. Percentage of elongation was the highest in M511 and the lowest in A2000 and was significantly higher (P<.001) for silicones with no added thixotropic agent. Hardness was highest in A2000 and lowest in M511. Adding a thixotropic agent decreased hardness significantly (P<.001) for Z004 and A2000 only. Conclusions The incorporation of thixotropic agents into the 3 maxillofacial silicone elastomers used in this study reduced some favorable mechanical properties, particularly tear strength and percentage of elongation. Z004 showed superior mechanical properties among the 3 tested silicones.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Publisher: Elsevier
ISSN: 0022-3913
Date of First Compliant Deposit: 13 September 2017
Date of Acceptance: 15 June 2017
Last Modified: 01 Aug 2018 12:45
URI: http://orca.cf.ac.uk/id/eprint/104608

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