The effect of oxalic acid incorporation on the setting time and strength of a glass-ionomer cement
| Autor: | Leon Hugh, Prentice, Martin, Tyas, Michael F, Burrow |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Oxalates
Materials science Compressive Strength Surface Properties Metallurgy Polyacrylic acid Oxalic acid Biomedical Engineering Glass ionomer cement General Medicine Biochemistry Hardness Oxalate Biomechanical Phenomena Biomaterials chemistry.chemical_compound Compressive strength chemistry Glass Ionomer Cements Materials Testing Tartaric acid Solubility Molecular Biology Biotechnology Nuclear chemistry |
| Zdroj: | Acta biomaterialia. 2(1) |
| ISSN: | 1742-7061 |
| Popis: | Oxalic acid and its metal oxalate salts have been used extensively in dentistry in a range of applications: as desensitisers, in cavity preparation, and as bonding agents. This study investigated the influence of oxalic acid upon the working time, initial setting time, 24-h hardness and compressive strength of a glass-ionomer cement. Conventional glass-ionomer liquids were prepared from polyacrylic acid, tartaric acid, water, and oxalic acid at concentrations of 0–7% w/w. Liquids were dosed into capsules with a commercial glass-ionomer powder, activated and mixed. The resultant pastes were assessed for working time, initial setting time, 24-h hardness and 24-h compressive strength. Liquids containing 0.5–1% oxalic acid lengthened the working time and initial setting time. At concentrations greater than 2%, both working and initial setting times decreased with increasing oxalic acid. Surface hardness values using liquids with 3% and 7% oxalic acid were less hard than the control. Compressive strength was unchanged over the concentrations tested. Oxalic acid may be a useful reaction modifier in glass-ionomer systems. It accelerated the setting reaction without affecting strength, but was limited to low concentrations because of its relatively poor solubility in water. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect