CHARACTERISTIC OF GLASS IONOMER CEMENT MATERIAL FOR CLINICAL DENTISTRY
Abstract
Glass ionomer cement (GIC), a thermoplastic polymer, is toughed by ionic bonding is used in dentistry as a filling material. The glass-powder used has some disadvantages such as: poor strength and toughness, and instability in water. Therefore, the aim of this work is to enhance mechanical and fluoride release properties of the GICs by modifying ingredients. The results show that the compressive strength reached to from 60.5 to 86.2 MPa, the setting time met the ISO 9917-1:2007 quality standard. This also suggests that, in addition to 35% PAA in water with Mw of 100,000, 5% of Maleic acid and 5% Tartaric acid to produce GIC which can be used as suitable materials for improving its fluoride ion release over 28 days. The average diameter (dmean) of glass powder for GICs was 14.3 mm; S.P. Surface area was 10,358 cm2=cm3, improvement of liquid composition includes 35% PAA in water with Mw of 100,000, 5% of Maleic acid and 5% Tartaric acid. The compressive strength after curing 28-day reaches from 60.5 to 86.2 MPa and the setting time responds with ISO 9917-1:2007. In conclusion, it was found that the GIC can release fluoride ions (F-) for the during of the examination period.
Downloads
References
[2] Sidhu S.K. Glass-ionomers in dentistry. Springer; 2016.
[3] Sakaguchi R.L., Powers J.M. Craig’s Restorative Dental Materials. Elsevier Health Sciences; 2012.
[4] Kusumoto H., Abolghasemi S., Woodfine B., Hill R.G., Karpukhina N., Law R.V.. The effect of phosphate, fluorine, and soda content of the glass on the mechanical properties of the glass ionomer (polyalkenoate) cements. J. Non-Cryst. Solids. 2016;449(C):94-99.
[5] Nicholson J.W. Fluoride-releasing dental restorative materials: anupdate. Balk. J. Dent. Med. 2014;18(2):60-69.
[6] Wilson A. D., Kent B. E.. A new translucent cement for dentistry. The glass ionomer cement. Br. Dent. J. 1972;13(4):133-135. DOI: 10.1038/sj.bdj.4802810
[7] McLean J. W., Wilson A. D.. The clinical development of the glass-ionomer cements. Formulations and properties. Aust. Dent. J. 1977;22(1):31-36.
[8] Wilson A. D. Resin-modified glass-ionomer cements. Int. J. Prosthodont. 1990;3(5):425–429.
[9] McLean J. W., Gasser O. Powdered dental material and process for the preparation thereof. US4527979A; 1985.
[10] Gu Y. W., Yap A. U. J., Cheang P., Khor K. A., Zirconia–glass ionomer cement-a potential substitute for Miracle Mix. Scr. Mater. 2005;52(2):113-116.
[11] Barry T. I., Clinton D. J., Wilson A. D. The structure of a glass-ionomer cement and its relationship to the setting process. J. Dent. Res. 1979;58(3):1072–1079.
[12] Mitsuhashi A., Hanaoka K., Teranaka T. Fracture toughness of resin-modified glass ionomer restorative materials: effect of powder/liquid ratio and powder particle size reduction on fracture toughness. Dent. Mater. Off. Publ. Acad. Dent. Mater.
2003;19(8):747–757.
[13] Prentice L. H., Tyas M. J., Burrow M. F.. The effect of particle size distribution on an experimental glassionomer cement. Dent. Mater. 2005;21(6):505–510.
[14] Griffin S. G., Hill R. G. Influence of glass composition on the properties of glass polyalkenoate cements. Part II: influence of phosphate content. Biomaterials. 2000;21(4):399–403.
[15] Kashani M.A.M.P. Effect of cation substitutions in an ionomer glass composition on the setting reaction and properties of the resulting glass ionomer cements. University of Birmingham; 2013.
[16] Kokubo T., H. Takadama. How useful is SBF in predicting in vivo bone bioactivity?. Biomaterials. 2006;27(15):2907-2915.
[17] Baig M. S., Fleming G. J. P., Conventional glassionomer materials: A review of the developments in glass powder, polyacid liquid and the strategies of reinforcement. J. Dent. 2015;43(8):897–912.
[18] Thomas B., Gupta K. In vitro biocompatibility of hydroxyapatite-added GIC: An SEM study using human periodontal ligament fibroblasts. J. Esthet. Restor. Dent. 2008;29(6):435–441.
