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Synthesis and Characterization of Mi...

Kafagy, Dhyaa H.

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Synthesis and Characterization of Microcapsule-Based Self-Healing Dental Composites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis and Characterization of Microcapsule-Based Self-Healing Dental Composites./
Author:	Kafagy, Dhyaa H.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	127 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.
Contained By:	Dissertation Abstracts International78-09B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10270128
ISBN:	9781369724868

Synthesis and Characterization of Microcapsule-Based Self-Healing Dental Composites.
Kafagy, Dhyaa H.

Synthesis and Characterization of Microcapsule-Based Self-Healing Dental Composites. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 127 p.

Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.

Thesis (Ph.D.)--The University of Tulsa, 2017.

This item is not available from ProQuest Dissertations & Theses.

Three primary research goals were achieved in this work, the development of a testing specimen specifically designed for characterization of self-healing dental composites, the quasi-static characterization of a self-healing dental composite under various testing conditions, and the fatigue characterization of a self-healing dental composite under different testing conditions. In addition to the primary goals, a new hybrid laser-cut and casting technique for the fabrication of miniature fracture specimens was developed. Fracture toughness values were obtained for a commercial dental composite and PMMA using two common testing specimens. These results were compared to values obtained from a compact form of the tapered double cantilever beam fracture specimen. The two control geometries were compact tension (CT), Single-Edge Notched Bending (SENB). The results show that the cTDCB specimen geometry is a valid method to measure the fracture toughness values for polymer composites. In general, the fracture toughness results from the CT specimens were lower than values obtained from the SENB, and the cTDCB methods. Side grooves were found to be essential for ensuring successful cTDCB tests. After sample validation, the maximum achievable healing effeciency was studied using an in-situ self-healing dental composite based on the incorporation of microcapsules. The self-healing performance was studied using fracture toughness as the material parameter. Initial and healed fracture toughness was assessed with a cTDCB, which enabled a crack-length-independent measure of fracture toughness. Nine combinations of healing chemistry were examined to understand the influence of acrylate monomer composition on healing performance. A combination of control tests and fully in-situ specimens were made to understand the influence of each component part of the healing system.. Incorporation of in-situ self-healing capsules up to 20 wt% into the dental composite did not negatively alter the fracture properties of the composite. Successful self-healing was realized underwater at 37 ?C and approximately 40% of healing efficiency was achieved in the in-situ self-healing specimens. After demonstration of quasi-static healing, fatigue tests were used to characterize the performance of self-healing dental composites under more realistic in-service loading conditions. Three sample types were tested using a servohydrualic fatigue load frame at room temperature. The tested specimens are dental composite, injection catalyzed dental composite with 15 wt% resin microcapsules, and dental composite with 20 wt% in-situ self-healing microcapsules. The fatigue test of in-situ self-healing composite was performed at RT and underwater at 37 °C. The results show that in-situ self-healing dental composites singificnaly extended fatigue life compared to non-healing samples.

ISBN: 9781369724868Subjects--Topical Terms:

543314
Materials science.

Synthesis and Characterization of Microcapsule-Based Self-Healing Dental Composites.
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506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Three primary research goals were achieved in this work, the development of a testing specimen specifically designed for characterization of self-healing dental composites, the quasi-static characterization of a self-healing dental composite under various testing conditions, and the fatigue characterization of a self-healing dental composite under different testing conditions. In addition to the primary goals, a new hybrid laser-cut and casting technique for the fabrication of miniature fracture specimens was developed. Fracture toughness values were obtained for a commercial dental composite and PMMA using two common testing specimens. These results were compared to values obtained from a compact form of the tapered double cantilever beam fracture specimen. The two control geometries were compact tension (CT), Single-Edge Notched Bending (SENB). The results show that the cTDCB specimen geometry is a valid method to measure the fracture toughness values for polymer composites. In general, the fracture toughness results from the CT specimens were lower than values obtained from the SENB, and the cTDCB methods. Side grooves were found to be essential for ensuring successful cTDCB tests. After sample validation, the maximum achievable healing effeciency was studied using an in-situ self-healing dental composite based on the incorporation of microcapsules. The self-healing performance was studied using fracture toughness as the material parameter. Initial and healed fracture toughness was assessed with a cTDCB, which enabled a crack-length-independent measure of fracture toughness. Nine combinations of healing chemistry were examined to understand the influence of acrylate monomer composition on healing performance. A combination of control tests and fully in-situ specimens were made to understand the influence of each component part of the healing system.. Incorporation of in-situ self-healing capsules up to 20 wt% into the dental composite did not negatively alter the fracture properties of the composite. Successful self-healing was realized underwater at 37 ?C and approximately 40% of healing efficiency was achieved in the in-situ self-healing specimens. After demonstration of quasi-static healing, fatigue tests were used to characterize the performance of self-healing dental composites under more realistic in-service loading conditions. Three sample types were tested using a servohydrualic fatigue load frame at room temperature. The tested specimens are dental composite, injection catalyzed dental composite with 15 wt% resin microcapsules, and dental composite with 20 wt% in-situ self-healing microcapsules. The fatigue test of in-situ self-healing composite was performed at RT and underwater at 37 °C. The results show that in-situ self-healing dental composites singificnaly extended fatigue life compared to non-healing samples.
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