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Dr. Kirsten  Thomas   image

Dr. Kirsten Thomas

20528 Boland Farm Rd Ste 207
Germantown MD 20876
301 696-6326
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #:
NPI: 1376892588
Taxonomy Codes:
103T00000X

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Publications

Feasibility of non-invasive detection of engineered nanoparticles in food mimicking matrices by Optical Coherence Tomography. - Food chemistry
The study was dedicated towards the detection of Engineered Nanoparticles (ENPs) by means of Optical Coherence Tomography (OCT). Polymeric films were produced to mimic complex food matrices whereas gold nanorods (AuNRs) were embedded to act as ENPs. The straightforward coating application resulted in a sufficient film wetting, adhesion and homogenous AuNR distribution. Compared to food samples, these films are simpler and better defined. Such artefacts are therefore promising candidate materials for quality assurance and regulatory matters. The OCT investigations revealed a dependency of the measured signal intensity on the AuNR concentration in the film. The limit of detection for the setup and material was estimated to be -8 dB. This value corresponds to a ppm nanoparticle concentration being well below the concentration used in food additive applications. Thus, the findings indicate the potential of OCT to screen food/feed products for a number of ENPs.Copyright © 2014 Elsevier Ltd. All rights reserved.
Fracture load of different crown systems on zirconia implant abutments. - Dental materials : official publication of the Academy of Dental Materials
The purpose of this study was to evaluate the fracture load of single zirconia abutment restorations using different veneering techniques and materials.The abutment restorations were divided into 6 groups with 20 samples each: test abutments (control group A), lithium disilicate ceramic crowns bonded on incisor abutments (group B), leucite ceramic crowns bonded on incisor abutments (group C), premolar abutments directly veneered with a fluor apatite ceramic (group D (layered) and group E (pressed)) and premolar abutments bonded with lithium disilicate ceramic crowns (group F). The fracture load of the restorations was evaluated using a universal testing machine. Half of each group was artificially aged (chewing simulation and thermocycling) before evaluating the fracture load with the exception of the test abutments.The fracture load of the test abutments was 705 ± 43N. Incisor abutments bonded with lithium disilicate or leucite ceramic crowns (groups B and C) showed fracture loads of about 580N. Premolar restorations directly veneered with fluor apatite ceramic (groups D and E) showed fracture loads of about 850N. Premolar restorations bonded with lithium disilicate ceramic crowns (group F) showed fracture loads of about 1850N. The artificial ageing showed no significant influence on the strength of the examined restorations.All ceramic crowns made of lithium disilicate glass-ceramic, adhesively bonded to premolar abutments showed the highest fracture loads in this study. However, all tested groups can withstand physiological bite forces.Copyright © 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

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20528 Boland Farm Rd Ste 207 Germantown, MD 20876
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