IADR Abstract Archives

Physicochemical Characterization of the Tribochemical Silicacoating Particles

Objectives: To improve the adhesion of dental material to various substrates, a tribochemical silicacoating (TSC) method has been developed. It utilizes airborne-particles abrasion with particles of a silica surface and alumina core. The impact of the TSC method has been studied extensively but less attention has been paid to the characterization of the Si-modified Al2O3 particles. The silica layer is known to improve adhesion between TSC treated substrate and resin via silane coupling agents. Si-modified Al2O3 particles could also have a positive impact as bone regenerative scaffolds because silica has a favourable effect on osteoblasts and bone mineralization. Thus, we carried out a physicochemical characterization the Si-modified Al2O3 particles.
Methods: Si-modified Al2O3 particles (Rocatec) of average particle size of 30 μm were studied for the phase composition, vibrational features, surface morphology, dissolution, and the capability to modify immersion solution pH value. Control material was Al2O3 without Si-modification. Pre-osteoblastic MC3T3-E1 cells were used for cell viability test with particles. Cell viability was tested at time points of 1, 3, 7, 10 day and with various particle concentrations. Multivariate ANOVA was used for statistical analyses.
Results: Silica enrichment was verified on the surface of Al2O3 particles and with the phase composition and vibrational feature analyses suggested silica to be in its amorphous form. In the dissolution test, no change in the pH of the immersion solution was found. Viability of pre-osteoblastic cells did not shown any major differences, whether the cells were cultured with Si-modified or plain Al2O3 particles.
Conclusions: Characterization of Si-modified Al2O3 particles differences in the particle surface structure due to presence of amorphous silica. Dissolution of silica layer was minor and in cell viability test no difference was found between control Al2O3 and its Si-modified counterpart.

2022 AADOCR/CADR Annual Meeting
Hybrid, Atlanta, Georgia
Dental Materials 5: Biocompatibility, Bioengineering and Biologic Effects of Materials
  • Sirkiä, Saara  ( Institute of Dentistry, University of Turku , Turku , Finland )
  • Siekkinen, Minna  ( Åbo Akademi University , Turku , Finland )
  • Qudsia, Syeda  ( Åbo Akademi University , Turku , Finland )
  • Smått, Jan-henrik  ( Åbo Akademi University , Turku , Finland )
  • Peltonen, Jouko  ( Åbo Akademi University , Turku , Finland )
  • Hupa, Leena  ( Åbo Akademi University , Turku , Finland )
  • Heino, Terhi  ( Institute of Biomedicine , Turku , Finland )
  • Vallittu, Pekka  ( Institute of Dentistry, University of Turku , Turku , Finland ;  City of Turku , Turku , Finland )
  • NONE
    VIRTUAL Interactive Talk Session
    Innovative Biomaterials & Technologies: From Restorative to Regenerative Dentistry
    Wednesday, 03/23/2022 , 08:00AM - 09:30AM