1286 Effect of Carbon Nanotubes on Mechanical Properties of Denture Resin

Saturday, March 24, 2012: 9:45 a.m. - 11 a.m.
Presentation Type: Poster Session
R. WANG1, R. KAYACAN2, C.H. KUCUKESMEN2, O. AKKUS1, C. BOSNYAK3, and L. LANG1, 1Case Western Reserve University, Cleveland, OH, 2Süleyman Demirel Üniversity, Isparta, Turkey, 313477 Fitzhugh Road, Designed Nanotubes LLC, Austin, TX
Objectives: Denture resin base fracture is not uncommon for clinicians. The purpose of this study was to exam the effect of functionalized multi-walled carbon nanotubes (MWCNT) on properties of a polymethyl methacrylate (PMMA) denture resin.

Methods: 4 groups of denture resin (Luciton 199, Densply Inc.) specimens were fabricated as: control, 0.5%, 1%, and 2% of MWCNT by weight. MWCNTs were dispersed to monomer by sonication. Each specimen was 10mmx40mmx3mm in size. 10 specimens of each group without thermocycles (TC) were subject to 3-point-bending test up to failure at a loading rate of 5 mm/min. Another 4 groups underwent 2000 thermo-cycles from 200C to 800C at one minute interval.  Knoop microhardness was performed on the control and experimental groups before and after thermocycling. 2-way ANOVA and Duncan’s test were used to identify any statistical differences. Fractured surfaces were analyzed by SEM.


Based on displacement vs. load curve, flexural strength, flexural modulus, yield stress, yield strain, and resilience were calculated for each specimen. Statistical analyses reveal that there is a significant difference of mechanical properties between before and after thermocycles. 2% MWCNT is harder and weakest among the groups. Summary of average maximum flexural strength as follows. 



0.5% MWCNT



Before TC





After TC






05% MWNCT significantly improved yield stress (20%) and resilience (14%) than control group as arrester/retarder for crack propagation. The higher % of WMCNT dispersed in PMMA was not beneficial. SEM analysis showed sporadic agglomerations presented on fracture surface of 2% WMCNT samples.

Keywords: Dental materials, Polymers, Prostheses, Stain and Stress