Open AccessAssessment of the Effect of Acid and Base Cycling on Mechanical Properties of Various Esthetic Restorative Materials
Author(s) -
Horieh Moosavi,
Fatemeh Rezaei,
Zahra Rezaei,
Zahra Soroush
Publication year - 2021
Publication title -
journal of advances in medicine and medical research
Language(s) - English
Resource type - Journals
ISSN - 2456-8899
DOI - 10.9734/jammr/2021/v33i2231157
Subject(s) - distilled water , materials science , glass ionomer cement , flexural strength , composite material , elastic modulus , indentation hardness , flexural modulus , dynamic mechanical analysis , composite number , cycling , modulus , chemistry , microstructure , polymer , archaeology , chromatography , history
Objective: The purpose of this study is the evaluation of the effect of pH cycling, including both acidic and alkaline environments, on the mechanical properties of tooth-colored restorative materials.
Methods and Materials: 20 rectangular bar specimens of one bulk-fill restorative composite, two conventional nanohybrid restorative composites, and one restorative resin-modified glass ionomer were produced according to ISO 4049. Half of the materials were stored in an acid and base cycling defined as two-day storage in acidic (pH =4) and alkaline (pH=8) solutions. The rest of the materials were incubated in distilled water as a control group. The storage lasted for 48 days. Finally, flexural strength, elastic modulus, and microhardness of the specimens in each group determined. Data analyzed with Kruskal-Wallis, Dunn, MANOVA, Tukey HSD and T-test.
Results: The pH cycling model had a significant influence on all mechanical properties of the bulk-fill restorative composite and resin-modified glass ionomer than those stored in water (P <0.05). One of the conventional nanohybrid restorative composites showed a significant reduction in elastic modulus and microhardness while the other one showed a significant reduction only in flexural strength.
Conclusion: pH cycling negatively affects the mechanical properties of resin composites, and the materials’ composition is an important factor in the degradation of the resin-based materials examined.