The setting chemistry of glass ionomer cement



The setting chemistry of glass ionomer cement was investigated by using mechanical determination of compressive strength at predetermined intervals, and measurement of structure changes of corresponding fracture sample by means of IR spectra and differential scanning calorimetry (DSC). Zinc polycarboxylate cement was used as a comparison sample. The compressive strength of glass ionomer cement (GIC) increases with aging. IR spectra and DSC of corresponding fracture sample show the structure changes of the matrix and interface layer comprising of silica gel during the predetermined intervals studied, however, no significant changes occur in the zinc polycarxyolate cement. Hence the structure changes of the matrix and or interface layer are responsible for compressive strength increasing with aging. The structure changes include the crosslink density, the ratio of complex form to ionic form, the content ratio of Al-PAA to Ca-PAA, the forming and maturing process of the interface layer comprising of silica gel.

Key words

IR DSC glass ionomer cement compressive strength set reaction 


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Copyright information

© Editorial Office of Journal of Wuhan University of Technology-Materials Science Edition 2005

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessWuhan University of TechnologyWuhanChina
  2. 2.Key Lab for Oral Biomedical Engineering, Ministry of Education, School of StomatologyWuhan UniversityWuhanChina

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