Effect of oral environmental pH on the dynamic characterization of bioactive restorative materials
Document Type
Article
Publication Date
9-1-2022
Abstract
The objective of this study was to investigate the effects of oral environmental pH on the viscoelastic properties of bioactive restorative materials (BRMs) by using dynamic mechanical analysis. Stainless steel molds were used to fabricate 40 beam-shaped specimens (12 x 2 x 2 mm) for each material. The specimens were finished, measured, randomly divided into four groups (n = 10), and immersed in aqueous solutions of pH 3.0, 5.0, 6.8 and 10.0 at 37 degrees C for seven days. The specimens were then subjected to dynamic mechanical analysis with a 5 N load and frequency range of 0.1-10.0 Hz. Data were analyzed using one-way ANOVA/Dunnet T3's test (alpha = 0.05). Mean elastic modulus spanned from 2.68 +/- 0.17 to 6.49 +/- 0.71 GPa, while viscous modulus ranged from 0.43 +/- 0.03 to 0.62 +/- 0.12 GPa. Loss tangent differed from 77.30 +/- 4.90 to 164.50 +/- 9.12. Significant differences among pH were discerned for (i) Elastic modulus: Cention N - pH 3.0, 5.0, 10.0 > 6.8; Activa Bioactive - pH 3.0, 6.8, 10.0 > 5.0, (ii) Viscous modulus: Cention N - pH 3.0, 5.0, 10.0 > 6.8, and (iii) Loss tangent: Activa Bioactive - pH 5.0 > 3.0, 6.8, 10.0. Significant differences in viscoelastic properties were noted among the BRMs with Activa Bioactive presenting the lowest elastic modulus for all pH. Immersion of all materials in pH 6.8 yielded the highest elastic modulus, except for Activa Bioactive. The effects of environmental pH on viscoelastic properties of BRMs are material-dependent.
Keywords
Bioactive, dynamic mechanical analysis, pH, viscoelastic
Divisions
restoreden
Funders
Universiti Malaya [Grant No: DPRG/02/21]
Publication Title
Sains Malaysiana
Volume
51
Issue
9
Publisher
Penerbit Universiti Kebangsaan Malaysia
Publisher Location
FACULTY SCIENCE & TECHNOLOGY, BANGI, SELANGOR, 43600, MALAYSIA