Setting Reaction And Compressive Strength Of Glass                                        Polyalkenoate Cements Based On C...
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Poster for setting reaction & compressive strength of GPC with and without MMT

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Poster for setting reaction & compressive strength of GPC with and without MMT

  1. 1. Setting Reaction And Compressive Strength Of Glass Polyalkenoate Cements Based On Ca/Na Fluoro- aluminosilicate Glasses *0C87:20 -0=760>0:" !(=#+;=60C87: /07:@227: (3<0=?93:? ;4 ’6397>?=B" )01@8?B ;4 -173:13" .:7A3=>7?7 ,@?=0 *080B>70" &%&$$ .,* -3=20:5" -380:5;= INTRODUCTION DISCUSSION• Glass polyalkenoate cement (GPC) is also known as water based glass ionomercement (GIC) COMPRESSIVE STRENGTH• Produced by the acid-base neutralization reaction of aqueous polyacrylic acid(PAA) with calcium fluoro-alumino silicate glass powder [1]. 80 80 70 With Compressive Strength, MPa Compressive Strength, MPa 60 70 50 MMT 60 40 50 30 Without 40 20 MMT 10 30 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 Aging Time, day Aging Time, day Figure 3: Compressive strength of LG3 Figure 4: Compressive strength of LG66 Figure 1: Reaction mechanism in GPC formation cement cement • Compressive strength for both cements increased with time.• Uses: Dental restoration material, luting agent, cavity linings and bases [1]. • Addition of MMT showed the significant increase of compressive strength for both cement. The• Advantages: self-hardening, chemically bonded to dental tissues, non-toxic formation of hydrogen bonding between MMT and acid provides the great effect on theand good biocompatibility. compressive strength [2]. • LG3 cement exhibited higher compressive strength than LG66 cement. However, the value became slightly drop after 14 days . OBJECTIVES •The composition of the glasses has a substantial effect on the setting behaviour. Thus, compressive strength are different.1. To follow the setting reaction of GPCs •LG66 cement contain Na have a disproportionate influence on cement properties and affect2. To study influence of MMT on compressive strength of GPC compressive strength [3].3. To investigate the influence of Na on the setting reaction of cement FTIR SPECTROSCOPY 100 METHODOLOGY 100 100 80 80 80 % Intensity % Intensity % IntensityGLASS COMPOSITION 60 60 60 Si-O (Si) Si-O (Si) 40 40 40 Stretch Stretch COOH Code SiO2 Al2O3 P2O5 CaO CaF2 Na2O 20 20 20 O-H stretch 0 0 0 LG3 33.3 22.2 11.1 22.2 11.1 - 4 000 3 500 3 000 2 500 20 00 15 00 10 00 50 0 4 00 0 3 5 00 3 00 0 25 00 2 00 0 15 0 0 1 00 0 5 00 4 000 3 500 3 000 2 500 20 00 15 00 10 00 50 0 Wavenumber, cm-1 Wavenumber, cm-1 Wavenumber, cm-1 LG66 33.3 22.2 11.1 17.8 11.1 4.4 Figure 5: FTIR spectrum for LG3 glass Figure 6: FTIR spectrum for LG66 glass Figure 7: FTIR spectrum for PAA Table 1: Glass composition in mole percentageGPC PREPARATION GPC with MMT GPC without MMT Glass powder + PAA + Glass powder + PAA + water water + MMT clay Ratio : 2 : 1 : 1 Ratio : 2 : 1 : 1 : 2.5wt% CONCLUSION The addition of MMT in LG3 and LG66 cements increasedcement (5minutes- Figure 8: FTIR spectra for LG3 the compressive strength from 53 to for LG66 cement (5minutes- Figure 9: FTIR spectra Mixed homogenously and placed into 74 28days)and from 10 MPa to 66 MPa at 14 and 28 28days) MPa test mold days aging time respectively. -1 is the asymmetric Si-O(Si) in original glasses. • Absorption band between 1050 – 980 cm • As time elapsed, the shoulder peak at 1570 cm-1 and 1550 cm-1 became increase in intensity due to formation COO-M+ as metal ions (Al3+ and Ca2+) crosslink with the carboxyl group in the acid [4]. - test mold kept at 37°C for 1 hour. • In contrast, the intensity of shoulder peak at 1710 cm-1 became decrease in intensity due to - quenched into liquid nitrogen ( for less 1 hour GPCs) and uptake of H+ from acid by silica network to form silica gel layer during the cross linking of metal ions dehydrated with ethanol. and COO- in cements formation. - GPCs immersed and stored in water at 37 °C. • Setting reaction of LG66 cement were slower than LG3 cement. Na + in LG66 cement have -ageing time: 5 minutes, 10 minutes,30 minutes, 1 hour, 6 hours, tendency to compete with Al3+ and Ca2+ and delayed the crosslinking process [3]. 1 day, 7days, 14 days and 28 days. ANALYSIS Setting reaction by Fourier Transform Infrared spectroscopy. CONCLUSION Compressive strength by Instron compressive machine. • FTIR spectroscopy can be used to follow the setting reaction of GPCs by assigning the conversion of COOH to COO- M+. • The compressive strength for both GPCs were increased with the addition of MMT. • The presence of Na influence the setting reaction and compressive strength of GPCs. REFERENCES 1. Nicholson J.W., Chemistry of glass-ionomer cements: a review. Biomaterials 1988, 19, 485-494. 2. Dowling A.H., Stamboulis A., Fleming J.P., The influence of montmorillonite (MMT) clay reinforcement on the performance of a glass ionomer restorative. Journal of dentistry 2006, 34, 802-810. 3. De Barra, Hill R.G., Influence of alkali metal ions on the fracture properties of glass polyalkenoate (ionomer) Figure 2: Compressive strength test cements. Journal of Biomaterial 1998, 19, 495-502. 4. Crisp S., Wilson A.D., Reaction in glass-ionomer cements . The precipitate reaction. J.Dent Res 1974, 53, 1420- 1424.

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