| 1603 Vickers Hardness and Compressive Strength Testing of Silk-based Biomaterial | ||||||||||||||||||||||||
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R.A. DICKINSON1, S. STIPHO2, D. KAPLAN3, G. KUGEL4, H.J. KIM3, and G. LEISK3, 1Tufts University, South Boston, MA, USA, 2Tufts University, Hopkinton, MA, USA, 3Tufts University, Medford, MA, USA, 4Tufts University, Lexington, MA, USA Objective: The purpose of this project was to begin exploring biopolymer based materials for potential application in dental restorations. Studies were initiated with a silk-based polymer. Using a patented process, prototype non-mineral silk block materials were formed and mechanical properties were evaluated. Strength and hardness are two of the relevant mechanical properties for dental restoration materials. This study is a starting point to allow for further manipulation of the silk with the goal of producing a biomaterial for dental needs. Methods: The compressive strength and hardness properties of the silk-based polymer material were compared to those of a commercially available dental restoration material, Paradigm MZ100 composite (MZ100, 3M ESPE). The silk-based polymer material was fabricated by a patented protocol. Once the silk blocks were made, mechanical tests were run on both the silk blocks and the MZ100 composite blocks. Microhardness was measured with a Vickers indenter, using a 300g load and 12s dwell time. Compressive strength testing was performed using a 10kN load cell. Results:
Table 1: Compressive strength testing of 3M ESPE MZ100 composite and silk plug polymer (n=8), analyzed by ANOVA.
Table 2: Vickers Hardness testing of MZ100 composite and silk plug polymer (n=72), analyzed by ANOVA.
Conclusions: The results indicate a need to improve the strength of the silk biopolymer with modifications in mineral loading and processing modes in pursuit of new dental composite systems. Biopolymer based systems such as silk may be significant due to the ability to tailor structure and function to improve mechanical performance, interfacial stability and to promote slow regeneration of native tissue. This work was suppored by NIH grants ED002520, EB003210. | ||||||||||||||||||||||||
| Seq #186 - Mechanical Properties 3 2:00 PM-3:15 PM, Friday, March 23, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J | ||||||||||||||||||||||||
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Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program
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