title: Enhancement effect of pre-reacted glass on strength of glass-ionomer cement.
abstract: In this paper, we report on the enhanced strength of glass ionomer cement (GIC) by using the process of pre acid-base reaction and spray drying in glass preparation. The pre acid-base reaction was induced by prior mixing of the glass powder with poly(alkenoic acid). The weight ratios of glass powder to poly(alkenoic acid) were varied to investigate the extent of the pre acid-base reaction of the glass. The effect of the spray drying process which produced spherical glass particles on cement strength was also studied and discussed. The results show that adding 2%-wt of poly(alkenoic acid) liquid in the pre-reacted step improved cement strength. GICs prepared using a mixture of pre-reacted glass with both spherical and irregular powders at 60:40 by weight exhibited the highest compressive strength at 138.64±7.73 MPa. It was concluded that glass ionomer cements containing pre-reacted glass with mixed glass morphology using both spherical and irregular forms are promising as restorative dental materials with improved mechanical properties and handling characteristics.
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science Park, Pathumthani 12120, Thailand. narupork@mtec.or.th
authors.forename: Naruporn
authors.initials: N
authors.lastname: Monmaturapoj
authors.forename: Wiwaporn
authors.initials: W
authors.lastname: Soodsawang
authors.forename: Siriporn
authors.initials: S
authors.lastname: Tanodekaew
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D019245:Compressive Strength; D003461:Crystallography; D003764:Dental Materials / Q000737:chemistry; D003890:Desiccation; D005898:Glass / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000138:chemical synthesis / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011208:Powders / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013324:Strontium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D011208:Powders; C006903:carbopol 940; D012822:Silicon Dioxide; D000537:Aluminum Oxide; D013324:Strontium