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The effect of varying monocalcium phosphate and polylysine levels on dental composite properties

Alkhouri, Nabih; Xia, Wendy; Ashley, Paul; Young, Anne; (2023) The effect of varying monocalcium phosphate and polylysine levels on dental composite properties. Journal of the Mechanical Behavior of Biomedical Materials , Article 106039. 10.1016/j.jmbbm.2023.106039. Green open access

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Abstract

Objectives The aim was to quantify effects of polylysine (PLS, 2 or 5 wt%) and monocalcium phosphate (MCP, 4 or 8 wt%) on properties of dental composites. Methods Light-activated, lower surface polymerisation kinetics versus sample depth (1–4 mm) of 4 formulations were quantified using ATR-FTIR. Water sorption and solubility (at 1 week) were assessed following ISO/4049. PLS release (over 1 month) and biaxial flexural strength (over 6 months) of fully-cured, water-immersed, 1 mm thick discs were determined. Surface mineral precipitation, following immersion in simulated body fluid (SBF), was assessed by SEM. Z250 was used as a conventional composite comparator. Results With 40s light exposure, increasing depth (from 1 to 4 mm) led to enhanced delay before polymerisation (from 3 to 17s) and decreased final conversion (72-66%) irrespective of PLS and MCP level. Increasing PLS and MCP raised solubility (4–13 μg/mm3). Water sorption (between 32 and 55 μg/mm3) and final PLS release (8–13% of disc content) were raised primarily by increasing PLS. Higher PLS also reduced strength. Strength reached minimum values (69–94 MPa) at 3 months. Surface mineral deposition was enhanced by increased MCP. For Z250, polymerisation delays (3-6s) and final conversions (55-54%) at 1-4 mm depth, solubility (0 μg/mm3), water sorption (16 μg/mm3) and strength (180 MPa) were all significantly different. Conclusion Delay time increased whilst final conversion decreased with thicker samples. Higher PLS enhances its percentage release, but lower level is required to keep water sorption, solubility and mechanical properties within ISO 4049 recommendations. Doubling MCP raises solubility and enhances minerals reprecipitation with minimal mechanical property compromise.

Type: Article
Title: The effect of varying monocalcium phosphate and polylysine levels on dental composite properties
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jmbbm.2023.106039
Publisher version: https://doi.org/10.1016/j.jmbbm.2023.106039
Language: English
Additional information: This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Keywords: Dental composite, Polymerisation, Strength, Water sorption, Polylysine, Monocalcium phosphate
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Biomaterials and Tissue Eng
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > EDI Craniofacial and Development Sci
URI: https://discovery.ucl.ac.uk/id/eprint/10174156
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