Please use this identifier to cite or link to this item: https://doi.org/10.1002/jbm.b.30919
Title: Effect of chain modifications on the physicomechanical properties of silsesquioxane-based dental nanocomposites
Authors: Soh, M.S.
Yap, A.U.J. 
Sellinger, A.
Keywords: Dental polymers
Mechanical properties
Nanocomposites
Polymerization shrinkage
Silsesquioxane
Issue Date: 2008
Source: Soh, M.S., Yap, A.U.J., Sellinger, A. (2008). Effect of chain modifications on the physicomechanical properties of silsesquioxane-based dental nanocomposites. Journal of Biomedical Materials Research - Part B Applied Biomaterials 85 (1) : 78-86. ScholarBank@NUS Repository. https://doi.org/10.1002/jbm.b.30919
Abstract: The objective of this study was to evaluate the physicomechanical properties of a series of polyhedral silsesquioxane (SSQ) methacrylate monomers developed for dental applications. The effect of chain modifications on the properties of the SSQ-based monomers was also evaluated. Physicomechanical properties that are investigated include polymerization shrinkage, degree of conversion, hardness, and modulus. Results obtained were compared with unfilled 1:1 (control) bis-GMA/TEGDMA materials (typical monomers used in dental composites). All samples investigated were cured using 400-500 nm light at 500 mW/cm2 for 40 s. Shrinkage associated with curing and post-gel reactions for all synthesized SSQ compounds were found to range from (0.04 ± 0.01)% to (0.33 ± 0.03)% with degree of conversion ranging from (56.68 ± 2.81)% to (84.53 ± 2.62)%. At all time intervals, post-gel shrinkage associated with control was found to be significantly greater than all SSQ compounds. No significant difference in degree of conversion was observed for control, and all SSQ compounds except for SSQ attached with eight equivalents of short-chain methacrylate. Mechanical properties associated with SSQ compounds were found to be significantly lower than control. However, through chain modifications, mechanical properties of SSQ compounds can be improved by ∼50%. © 2007 Wiley Periodicals, Inc.
Source Title: Journal of Biomedical Materials Research - Part B Applied Biomaterials
URI: http://scholarbank.nus.edu.sg/handle/10635/46847
ISSN: 15524973
DOI: 10.1002/jbm.b.30919
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