\"The purpose of this Ph.D. research is to investigate and improve two classes of hydroxyapatite (HA)-based biomaterials for bone repair: calcium phosphate microspheres and bioactive silicate glass scaffolds. These biomaterials were prepared with modified compositions and microstructures and then were evaluated for bone regeneration.
The open HA microspheres with dense convex surfaces and rough and porous concave surfaces were obtained by sectioning closed hollow HA microspheres. Bone regeneration with the open HA microspheres was greater than with the closed HA microsphere at 12 weeks. Hollow biphasic calcium phosphate (BCP) microspheres have been prepared with different fractions of HA and β-TCP (tricalcium phosphate) and their in vitro and in vivo reactivities determined. The BCP microspheres with higher ß-TCP/HA ratio (70/30) had faster degradation rates both in vitro and in vivo and a better capacity to regenerate bone. Moreover, the more reactive BCP microspheres were associated with significantly more blood vessel formation in the subcutaneous implants.
13-93 glass scaffolds with curved filaments stimulated a greater amount of new bone formation than straight filament scaffolds in rat calvarial defect at six weeks. Scaffolds with thin (6 ± 1 μm) HA-like surface layers were more effective at stimulating new bone formation, with the curved-filament structures again showing significant improvement in new bone growth compared to the surface-modified straight-filament structures\"--Abstract, page iv.
","abstract_html":"<p>"The purpose of this Ph.D. research is to investigate and improve two classes of hydroxyapatite (HA)-based biomaterials for bone repair: calcium phosphate microspheres and bioactive silicate glass scaffolds. These biomaterials were prepared with modified compositions and microstructures and then were evaluated for bone regeneration.</p> <p>The open HA microspheres with dense convex surfaces and rough and porous concave surfaces were obtained by sectioning closed hollow HA microspheres. Bone regeneration with the open HA microspheres was greater than with the closed HA microsphere at 12 weeks. Hollow biphasic calcium phosphate (BCP) microspheres have been prepared with different fractions of HA and β-TCP (tricalcium phosphate) and their <em>in vitro </em>and <em>in vivo </em>reactivities determined. The BCP microspheres with higher ß-TCP/HA ratio (70/30) had faster degradation rates both <em>in vitro </em>and <em>in vivo </em>and a better capacity to regenerate bone. Moreover, the more reactive BCP microspheres were associated with significantly more blood vessel formation in the subcutaneous implants.</p> <p>13-93 glass scaffolds with curved filaments stimulated a greater amount of new bone formation than straight filament scaffolds in rat calvarial defect at six weeks. Scaffolds with thin (6 ± 1 μm) HA-like surface layers were more effective at stimulating new bone formation, with the curved-filament structures again showing significant improvement in new bone growth compared to the surface-modified straight-filament structures"--Abstract, page iv.</p>","abstract_has_math":false,"creators":["Shen, Youqu"],"institution":"Missouri University of Science and Technology","degree_name":"Ph. D. in Materials Science and Engineering","degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T03:18:34Z","subjects":["Bioactive glass","Biomaterials","Bone regeneration","Calcium phosphate","Glass conversion technique","Robocasting","Materials Science and Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsmine.mst.edu/doctoral_dissertations/2849","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Shen, Youqu"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Dissertation - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph. D. in Materials Science and Engineering"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Missouri University of Science and Technology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Bioactive glass","Biomaterials","Bone regeneration","Calcium phosphate","Glass conversion technique","Robocasting","Materials Science and Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsmine.mst.edu/doctoral_dissertations/2849"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["\"The purpose of this Ph.D. research is to investigate and improve two classes of hydroxyapatite (HA)-based biomaterials for bone repair: calcium phosphate microspheres and bioactive silicate glass scaffolds. These biomaterials were prepared with modified compositions and microstructures and then were evaluated for bone regeneration.
The open HA microspheres with dense convex surfaces and rough and porous concave surfaces were obtained by sectioning closed hollow HA microspheres. Bone regeneration with the open HA microspheres was greater than with the closed HA microsphere at 12 weeks. Hollow biphasic calcium phosphate (BCP) microspheres have been prepared with different fractions of HA and β-TCP (tricalcium phosphate) and their in vitro and in vivo reactivities determined. The BCP microspheres with higher ß-TCP/HA ratio (70/30) had faster degradation rates both in vitro and in vivo and a better capacity to regenerate bone. Moreover, the more reactive BCP microspheres were associated with significantly more blood vessel formation in the subcutaneous implants.
13-93 glass scaffolds with curved filaments stimulated a greater amount of new bone formation than straight filament scaffolds in rat calvarial defect at six weeks. Scaffolds with thin (6 ± 1 μm) HA-like surface layers were more effective at stimulating new bone formation, with the curved-filament structures again showing significant improvement in new bone growth compared to the surface-modified straight-filament structures\"--Abstract, page iv.
"]},{"key":"dc:title","label":"Title","values":["Biomaterials for bone regeneration"]}]}],"canonical_facts":{"dc:creator":["Shen, Youqu"],"dc:description.abstract":["\"The purpose of this Ph.D. research is to investigate and improve two classes of hydroxyapatite (HA)-based biomaterials for bone repair: calcium phosphate microspheres and bioactive silicate glass scaffolds. These biomaterials were prepared with modified compositions and microstructures and then were evaluated for bone regeneration.
The open HA microspheres with dense convex surfaces and rough and porous concave surfaces were obtained by sectioning closed hollow HA microspheres. Bone regeneration with the open HA microspheres was greater than with the closed HA microsphere at 12 weeks. Hollow biphasic calcium phosphate (BCP) microspheres have been prepared with different fractions of HA and β-TCP (tricalcium phosphate) and their in vitro and in vivo reactivities determined. The BCP microspheres with higher ß-TCP/HA ratio (70/30) had faster degradation rates both in vitro and in vivo and a better capacity to regenerate bone. Moreover, the more reactive BCP microspheres were associated with significantly more blood vessel formation in the subcutaneous implants.
13-93 glass scaffolds with curved filaments stimulated a greater amount of new bone formation than straight filament scaffolds in rat calvarial defect at six weeks. Scaffolds with thin (6 ± 1 μm) HA-like surface layers were more effective at stimulating new bone formation, with the curved-filament structures again showing significant improvement in new bone growth compared to the surface-modified straight-filament structures\"--Abstract, page iv.
"],"dc:identifier":["https://scholarsmine.mst.edu/doctoral_dissertations/2849"],"dc:subject":["Bioactive glass","Biomaterials","Bone regeneration","Calcium phosphate","Glass conversion technique","Robocasting","Materials Science and Engineering"],"dc:title":["Biomaterials for bone regeneration"],"dc:type":["Dissertation - Open Access"],"thesis:degree_name":["Ph. D. in Materials Science and Engineering"],"thesis:institution_name":["Missouri University of Science and Technology"]},"updated_at":"2026-07-24T03:18:34Z"}