ingest cdrApp 2017-07-05T20:19:25.704Z b743dd6f-fb31-445f-b2b9-a0aa4f8b7562 modifyDatastreamByValue RELS-EXT fedoraAdmin 2017-07-05T20:41:50.989Z Setting exclusive relation modifyDatastreamByValue RELS-EXT fedoraAdmin 2017-07-05T20:41:59.193Z Setting exclusive relation addDatastream MD_TECHNICAL fedoraAdmin 2017-07-05T20:42:07.596Z Adding technical metadata derived by FITS modifyDatastreamByValue RELS-EXT fedoraAdmin 2017-07-05T20:42:23.909Z Setting exclusive relation addDatastream MD_FULL_TEXT fedoraAdmin 2017-07-05T20:42:32.311Z Adding full text metadata extracted by Apache Tika modifyDatastreamByValue RELS-EXT fedoraAdmin 2017-07-05T20:42:47.979Z Setting exclusive relation modifyDatastreamByValue RELS-EXT cdrApp 2017-07-06T11:39:06.846Z Setting exclusive relation modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-01-25T07:48:20.257Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-01-27T08:13:59.264Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-03-14T04:43:18.018Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-05-17T16:23:28.768Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-07-11T03:11:30.197Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-07-17T23:30:20.564Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-08-15T19:39:16.158Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-09-21T19:59:11.940Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-09-26T23:14:50.538Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2018-10-11T23:51:45.717Z modifyDatastreamByValue MD_DESCRIPTIVE cdrApp 2019-03-20T17:46:07.392Z Eduard Epure Author Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. Spring 2017 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. Spring 2017 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. Spring 2017 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017-05 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor Andre Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 University of North Carolina at Chapel Hill Degree granting institution Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor André Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill; composite; intraoral; resin; scanner; wear eng Master of Science Masters Thesis Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor Andre Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 University of North Carolina at Chapel Hill Degree granting institution Eduard Epure Creator Department of Operative Dentistry School of Dentistry Clinical Comparison of Wear Characteristics of Conventional and Bulk-Fill Resin Composites Over Time Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill, composite, intraoral, resin, scanner, wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Dentistry (Operative Dentistry) Ricardo Walter Thesis advisor Lee Boushell Thesis advisor Andre Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Eduard Epure Creator Department of Operative Dentistry School of Dentistry Objective: To comparatively assess the vertical and volume wear of a conventional incremental-fill and a novel bulk-fill nanocomposite using an indirect method (3D analysis of gypsum replicas) and a novel direct method (intraoral scanner), in parallel. Methods: Each patient recruited for this randomized, controlled clinical trial received one- or two-pairs of Class II restorations using an incremental-fill (Filtek Bulk Fill Posterior, 3M ESPE) and a bulk-fill (Filtek Supreme Ultra, 3M ESPE) resin composite. Baseline and 6-month recall impressions were taken with conventional VPS material (Imprint 3, 3M ESPE) and with an intraoral scanner (3M True Definition, 3M ESPE). Gypsum replicas of the conventional impressions were digitized using a laboratory scanner (Lava Scan ST, 3M ESPE). Vertical wear and volume loss for each material and wear-measuring method was calculated. Results: Premolars restored with the bulk-fill resin composite had a statistically significant greater mean depth loss (17±8 µm) versus the incremental-fill group (11±5 µm) (p=0.043). Measurements made with the direct method had good to excellent agreement with the indirect method (ICC 0.734 – 0.997). Conclusion: Within the limitations of this study, the intraoral scanner used may be suitable for clinical assessment of wear. Three-body abrasive wear of Filtek Bulk Fill Posterior (3M ESPE) was greater than that of Filtek Supreme Ultra (3M ESPE) in the premolar group. 2017 Dentistry bulk-fill; composite; intraoral; resin; scanner; wear eng Master of Science Masters Thesis University of North Carolina at Chapel Hill Graduate School Degree granting institution Ricardo Walter Thesis advisor Lee Boushell Thesis advisor Andre Ritter Thesis advisor Ibrahim Duqum Thesis advisor text 2017-05 Epure_unc_0153M_17084.pdf uuid:e83dfb3a-fe1c-49fe-adb1-1bce7769cdd0 2017-04-21T15:55:02Z 2019-07-05T00:00:00 proquest application/pdf 773857 yes