IADR Abstract Archives

Wear Characteristics of an Experimental High-Strength Fine-Sized Leucite Glass-Ceramic

Objectives: To test the wear characteristics of an experimental high-strength fine-sized leucite glass-ceramic against human enamel.

Methods: A wear testing protocol was adapted on an MTS-Bionix-858 system. Human enamel pins were wear tested against disc samples (n=12) of a commercial control (Ceramco-3, Dentsply) and an experimental fine-grained leucite glass-ceramic. Specimens were loaded (13.5N) followed by a lateral excursion movement and a controlled cuspal contact time (0.25s) to complete a cycle for 300,000 simulated masticatory cycles at 2Hz under continuous flow of deionised water (37°C). Wear quantification (volume/ mean-height loss) was performed by superimposition of digitised test surfaces before and after wear testing by non-contact 3D profilometry (Proscan-2000, Scantron) and the dedicated software using a novel protocol. Glass-ceramic disc/ tooth specimen groups were statistically compared (Mann-Whitney, p<0.05). Wear tested specimens were examined using SEM and Profilometry. Indicative surface roughness (Ra)/ waviness measurements (500 x,y line scans/ specimen) were also performed on a glass-ceramic disc/ tooth pair per group.

Results: Volume and mean-height loss results are listed below. A patterned wear profile with distinct parallel grooves was identified for the Ceramco-3 group versus the non-oriented wear profile of the experimental group. All recorded Ra and wave-height values for the experimental disc/ tooth group were lower than the Ceramco-3 group.

        Categories

           Ceramco-3

        glass-ceramic

       Experimental

       glass-ceramic

  Volume loss(mm3)

  (Discs)

     0.164(0.158,0.217)a

    0.190(0.154,0.214)a

  Volume loss(mm3)

  (Teeth)

    0.208(0.127,0.252)a

    0.133(0.110,0.151)b

  Mean-Height loss(μm)

  (Discs)

       61.8(55.2,72.0)a

       67.9(60.0,72.5)a

  Mean-Height loss(μm)

  (Teeth)

      88.3(69.8,103.0)a

       65.7(56.0,77.5)b

*Values represent medians (25%,75%percentiles).

Different superscript letters indicate significant (p<0.05) differences between groups within categories.

Conclusions: The experimental glass-ceramic exhibited significantly (p<0.05) lower antagonistic enamel wear when compared to a commercial control. Development of the fine-sized leucite material tested may support its use to achieve reduced rates of enamel loss.

(Medical Ethics REC: 06/Q0603/98, Funding: StBarts and The London Charitable foundation, RAB05/PJ/06, National Scholarships Foundation, IKY,Greece) 

 

 


IADR/PER General Session
2010 IADR/PER General Session (Barcelona, Spain)
Barcelona, Spain
2010
3673
Dental Materials 3: Ceramic-based Materials and Cements
  • Theocharopoulos, Antonios  ( Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, N/A, United Kingdom )
  • Chen, Xiaohui  ( Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, N/A, United Kingdom )
  • Hill, Robert  ( Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, N/A, United Kingdom )
  • Cattell, Michael  ( Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, N/A, United Kingdom )
    • Oral Session
    Structure and Performance
    07/17/2010