ABSTRACT: 0545
Shear Strength of Dental Composite Versus Mineralized Silk-Based Biomaterial
| M.R. WIMMER1, J.R. PLOURDE2, R.A. DICKINSON3, G. KUGEL1, E.H. DOHERTY1, S. FERREIRA4, and D. KAPLAN5, 1Tufts University, Boston, MA, USA, 2Tufts University, Gilford, NH, USA, 3Tufts University, South Boston, MA, USA, 4Tufts University School of Dental Medicine, Boston, MA, USA, 5Tufts University, Medford, MA, USA | ||||||||||||
Objective: The objective of this study were to perform shear bond strength (SBS) testing between an experimental mineralized silk based biopolymer and dentin in natural extracted teeth using resin cement. As a control, SBS of bonded composite-resin buttons of similar dimensions bonded to dentin were also evaluated. Methods: Extracted human teeth (n=16) set in acrylic were trimmed to expose flat dentin surfaces, polished wet with 240 grit sandpaper and stored in water. Cylindrical mineralized silk biopolymer (~6.5mm diameter, ~4-6mm height, n=8) were cemented to dentin surfaces using resin cement (Variolink II, Ivoclar Vivadent) under bonding pressure level of ~ 500g+/-100g. Composite-resin (4 Seasons, Ivoclar Vivadent) was loaded into a plastic straw, in order to fabricate uniform composite buttons for bonding (~5.8mm diameter, ~5mm height, n=8), bonded onto dentin surfaces using 5th generation single-component adhesive (Excite, Ivoclar Vivadent) and light-cured for 20s. Bonded specimens were stored in 37o water for 24 hrs. SBS was obtained with Instron 4202 at crosshead speed of 0.5 mm/min. Results: Table 1: SBS testing of composite and mineralized silk biopolymer bonded to dentin (n=16), analyzed by Independent Samples T-test
Conclusions: The results indicate a need to improve the adhesive capability of the silk-based biopolymer with modifications in interfacial surface structure in pursuit of optimizing the bond strength. The methods and materials used to characterize the ability of the silk-based biopolymer to bond to dentin will be repeated with enamel tooth structure. This work was supported by NIH grants ED002520, EB003210. Abstract ID#: 100157 Password: 313690 Submitter's or presenter's Email: richard.dickinson@tufts.edu Program Selection: Dental Materials 6: Polymer-based Materials - Physical Properties and Performance Consider for Poster Presentation ONLY: N The presenter is a Graduate student whose faculty advisor's email address is gerard.kugel@tufts.edu. The research described in this paper was supported by NIH. Keywords: Dental materials, Dentin, Adhesion, Composites, Biomaterials | ||||||||||||
| Seq #85 - Mechanical Testing of Resin Composites 8:00 AM-9:30 AM, Friday, April 4, 2008 Hilton Anatole Hotel Grand Ballroom B | ||||||||||||
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