“Reasons for poor durability of resin-dentin bonds”, National Institute of Dental and Craniofacial Research (DE R01 DE015306), D. Pashley PI, Medical College of Georgia.

“Characterization of Fatigue Limits for New Abutment Designs” Abutment Direct, PI D. Arola.

“Collaborative Study on Bacterial Activity in Cyclic Stress Environments” University of Maryland System, PI D. Arola with H. Xu of UM Dental School.

NIH R21 DE022625. PI: Huakun Xu.04/01/2012 - 03/31/2014. $412,500. Title: “Human Embryonic Stem Cells in Calcium Phosphate Constructs for Bone Regeneration.”

NIH R01 DE14190. PI: Huakun Xu.04/01/2009 - 03/31/2014. “Injectable and Strong Nano-Apatite/Stem Cell Scaffolds for Bone Regeneration.”

NIH R01 DE17974. PI: Huakun Xu. 04/01/2008 - 03/31/2013.“Development of High Performance, Caries-Inhibiting Dental Nano-Materials.”

Maryland Stem Cell Research Fund (MSCRF). PI: Huakun Xu. 07/01/2008 – 06/31/2011.“Stem Cell Delivery via Injectable, Nano-Apatite Scaffolds for Bone Engineering.”

NIH R01 DE14190A1-S. PI: Huakun Xu. 10/01/2009 - 9/31/2011. “Injectable and Strong Nano-Apatite/Stem Cell Scaffolds for Bone Regeneration.”