• Influence of halogen irradiance on short- and long-term wear resistance of resin-based composite materials.

      Bhamra, Gurcharn S; Fleming, Garry J P; Materials Science Unit, Division of Oral Biosciences, Dublin Dental School & Hospital, Trinity College Dublin, Dublin 2, Ireland. (2009-02)
      The increased number of ploughing actions of the antagonist on the RBC (long-term) results in increased friction which would be expected to play a major role in the wear process. The significant increase in the mean total volumetric wear, but not the mean maximum wear depth, observed over time which is exacerbated at reduced halogen irradiances emphasizes the arguments of DeLong for the employment of volume for evaluating material loss due to wear following in vitro wear simulation of RBCs.
    • The mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique.

      Curtis, Andrew R; Palin, William M; Fleming, Garry J P; Shortall, Adrian C C; Marquis, Peter M; Biomaterials Unit, School of Dentistry, University of Birmingham, St. Chads Queensway, Birmingham B4 6NN, UK. (2009-02)
      The validity of employing the micromanipulation technique to determine the mechanical properties of filler particulates was established. The 'nanoclusters' exhibited a greater tendency to multiple fractures compared with conventional fillers and possessed a comparatively higher variability of pseudo-modulus and load prior to and at fracture, which may modify the damage tolerance of the overall RBC system.