Original Article

Degree of Conversion of Resin-Modified Glass Ionomer Cement Containing Hydroxyapatite Nanoparticles


Objectives: Hydroxyapatite (HA) nanoparticles are used to improve the physical and mechanical properties of glass ionomers (GIs). This study aimed to assess the effect of addition of different weight percentages of nano-HA on degree of conversion (DC) of Fuji II LC GI cement using a spectrometer.
Materials and Methods: In this in vitro experimental study, 30 samples were fabricated of Fuji II LC (improved) GI cement in six groups (n=5) containing 0%, 1%, 2%, 5%, 7% and 10wt% nano-HA. The obtained paste in each group was subjected to Fourier-transform infrared spectroscopy (FTIR) before curing to assess the monomer to polymer DC percentage. The paste was then light-cured and underwent FTIR again. One-way ANOVA was applied to compare the DC percentage of different groups. Pairwise comparisons were performed using the Tukey’s test.
Results: The DC was 57.88±0.57% in 0%, 60.04±0.63% in 1%, 66.92±0.54% in 2%, 65.5±0.71% in 5%, 51.49±0.24% in 7% and 50.09±0.32% in 10% nano-HA group. The difference in DC among the groups was statistically significant (P<0.0001). The highest DC was noted in 2% nano-HA and the lowest DC was found in 10% nano-HA group. Pairwise comparisons revealed significant differences between the groups in DC (P<0.0001).
Conclusion: Increasing the weight percentage of nano-HA to 2% increased the DC but increasing the nano-HA weight percentage over 5% decreased the DC of resin-modified glass ionomer cement (RMGIC). The highest DC was noted in 5w% and 2w% nano-HA groups. Thus, 5w% and 2w% nano-HA can be used to improve the DC of RMGIC.

- Wiegond A, Bachalla W, Aten T. Review on fluoride releasing ,restorative materials-fluoride release and mechanical characteristics

antibacterial activity and influence on caries formation. Dent Mater 2007;23(3):343-362

- Yap AUJ, Teo JCM. Comparative wear resistance of reinforced glass .ionomer restorative materials. Oper Dent 2001;26:343-348

- Momoe Y, Hirosaki K, Kohno A, McCabe JF. In vitro tooth brushdentifrice abrasion of resin modified glass ionomers. Dent Mater


- Ab Rahman,Luddin N. One-pot synthesis of hydroxyapatite silicananopowder composite for hardness enhancement of glass ionomer cement (GIC). Bulletin of Materials Science.2014;37(2):213-19

- Sari MN, Tabaii ES, Vaziri AS, Ghaffari H, Kashani MA, Amirabadi GE. Effect of Nano-Hydroxyapatite Incorporation into Resin Modified Glass Ionomer Cement on Ceramic Bracket Debonding. Journal of Islamic Dental Association of IRAN (JIDAI) 2014;26(2)

- Lee JJ, Lee YK, Choi BJ, Lee JH, Choi HJ, Son HK, et al. Physical properties of resin-reinforced glass ionomer cement modified with micro and nano- hydroxyapatite. J Nanosci Nanotechnol. 2010 Aug;10(8):5270-6.

- Kalita SJ, Bhardwaj A, Bhatt HA. Nano crystalline calcium phosphate ceramics in biomedical engineering Materials Science and Engineering 2007;27:441- 449.

- Sadat-Shojai M. Preparation of hydroxyapatite nanoparticles: comparision between hydrothermal and Solvo-treatment processes and colloidal stability of

produced Nanoparticles in a dilute experimental dental adhesive. J Iran Chem Soc 2009;6:386-392.

- Mallmam A, Jacques L, Valenda LF, Mathio P, Muench A. Micro tensile bond strength of light and self-cured adhesive systems to intra-radiculer dentin using a translucent fiber post. Oper Dent 2005; 30(4):500-506.

- Qualtrough AJE, Mannocci F. Tooth colored post systems: A review. Oper Dent 2003;28:86-91.

- Ozyesil A, Usumes A, Gunduz B. The efficiency of different lightsources to polymerize composite beneath a simulated ceramic restoration. J Prosthet Dent 2004;91(2):151-157.

- Ruyter I. Conversion in different depths of ultraviolet and visible light activated materials. Acta Odontol Scand 1982;40:179-192.

- Atai M, Watts DC, Atai Z. Shrinkage strain-rates of dental resinmonomer

and composite systems. Biomaterials 2005;6:5015-5020.

- Moshaverinia A, Roohpour NWL, Chee W, Schricker S. A review of powder modifications in conventional glass-ionomer dental cements. J Mater Chem 2011;21:1319-1328.

- Mu YB, Zang GX, SunH C, Wang CK. Effect of nanohydroxyapatite to glass ionomer cement. Hua Xi Kou Qiang Yi Xue Zazhi 2007;25(6):544-547.

- Aoki H. Science and medical applications of hydroxyapatite. Tokyo Takayama Press System Center Co.1991.

- Poorzandpoush K, Omrani LR, Jafarnia SH, Golkar P, Atai M. Effect of addition of Nano hydroxyapatite particles on wear of resin modified glass ionomer by tooth brushing simulation. Journal of Clinical and Experimental Dentistry. 2017 Mar;9(3):e372.

- Mohammadi Basir M, Ataei M, Bagher Rezvani M, Golkar P. Effect of incorporation of various amounts of nano-sized hydroxyapatite on the mechanical properties of resinmodified glass ionomer. Beheshti Univ Dent J. 2013;4:216–23.

- Noronha Filho JD, Brandäo NL, Poskus LT, Guimaräes JG, Silva EM. A Critical analysis of the degree of conversion of resin – based luting cements. J Appl Oral Sci 2010;18:442- 446.

- Falsafi A, Mitra SB, Oxman JD, Ton TT, Bui HT. Mechanisms of setting reactions and interfacial behavior of a nano-filled resinmodified glass ionomer. Dental Materials. 2014 Jun 30;30(6):632- 43.

- Sadat-Shojai M, Atai M, Nodehi A, Khanlar LN. Hydroxyapatite nano-rods as novel fillers for improving the properties of dental adhesives: Synthesis and application. Dent Mater 2010;26:471-482.

- Garoushi S, Lassila LVJ, Vallittu PK. Influence of nanometer scale particulate fillers on some properties of micro-filled composite resin. J Mater Sci: Mater Med 2011;22:1645-1651.

- Moshaverinia AR, Ansari S, Movasaghi Z, Billington RW, Darr JA, Rehman RU. Modification of conventional glass-ionomer cements with N-vinylpyrrolidone containing polyacids, nano-hydroxy and fluoro-apatite to improve mechanical properties. Dent Mater 2008; 24:1381–1390.

- Cunha LG, Alonso RC, Neves AC, de Goes MF, Ferracane JL, Sinhoreti MA. Degree of conversion and contraction stress development of a resin composite irradiated using halogen and LED at two C-factor levels. Oper Dent 2009;34:24 31.

- Shin DH, Rawls HR. Degree of conversion and color stability of the light curing resin with new photoinitiator systems. Dent Mater 2009;25:1030–1038.

- Li J, von Beetzen M, Sundström F. Strength and setting behavior of resin- modified glass ionomer cements. Acta Odontologica Scandinavica 1995;53:311– 317

- Eliades G, Palaghias G. In vitro characterization of visible lightcured glass ionomer liners. Dent Mater 1993;9:198–203.

IssueVol 16, No 6 (2019) QRcode
SectionOriginal Article
DOI https://doi.org/10.18502/fid.v16i6.3440
Nano-Hydroxyapatite Polymerization Fuji II LC cement improved

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How to Cite
Jalalian B, Golkar P, Paktinat A, Ahmadi E, Panahande SA, Ranjbar Omrani L. Degree of Conversion of Resin-Modified Glass Ionomer Cement Containing Hydroxyapatite Nanoparticles. Front Dent. 16(6):415-420.