{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/86837"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/86837","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Load Resistance of Monolithic Zirconia Screw-Retained Implant-Supported Single Crowns with Straight and Angulated Screw Channel Designs","abstract":"M.S.","abstract_html":"M.S.","abstract_has_math":false,"creators":["Willis, Jeffrey; 0000-0003-2885-8060"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Kim, Hyeongil","Oral Sciences"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02-25T23:23:17Z","date_published":"2025-02-25T23:23:17Z","updated_at":"2026-07-27T19:05:37Z","subjects":["dentistry","bioengineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/86837","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kim, Hyeongil","Oral Sciences"]},{"key":"dc:creator","label":"Author","values":["Willis, Jeffrey; 0000-0003-2885-8060"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-02-25T23:23:17Z","2020","2020-08-04 12:32:43"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["dentistry","bioengineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/86837"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["M.S.","Recently popular angulated screw channel (ASC) crowns provide a prosthetic alternative to cement retention when implant trajectory is incompatible with traditionally designed screw- retained crowns. This study aimed to evaluate the fracture toughness of monolithic zirconia screw-retained implant-supported single crowns bonded to Ti bases with straight and angulated screw channel designs. A total of 30 maxillary left central incisor crowns were fabricated from monolithic gradiated translucency zirconia. Crowns were bonded to one of three corresponding Ti base interfaces (n = 10); 2 straight channel Ti bases (Straumann Variobase and Dess Ti Base) and 1 Ti base indicated for ASC crowns (Dess AngleBase). Mechanical loads up to 700 N were applied to the palatal aspect of assembled restorations at a 35° angle and force-displacement data were recorded. Excluding one instance of early failure, 100% of crowns remained intact through loading up to 700 N. Visible plastic deformation of the screw and Ti base was identified at this level of loading. At a load of 200 N, which is within the average clinical range for the anterior maxilla maximum force, the resistance to deflection of samples was not significantly different across all categories of Ti base (P > .05). In this study, incorporating an ASC into monolithic zirconia crowns did not impact fracture incidence at physiologic loading limit of 700 N when compared to similar restorations with traditional straight screw channels. The metallic components of screw-retained crowns appear to deform at loads below those where zirconia fracture is expected using the design studied.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Load Resistance of Monolithic Zirconia Screw-Retained Implant-Supported Single Crowns with Straight and Angulated Screw Channel Designs"]}]}],"canonical_facts":{"dc:contributor":["Kim, Hyeongil","Oral Sciences"],"dc:creator":["Willis, Jeffrey; 0000-0003-2885-8060"],"dc:date":["2025-02-25T23:23:17Z","2020","2020-08-04 12:32:43"],"dc:description":["M.S.","Recently popular angulated screw channel (ASC) crowns provide a prosthetic alternative to cement retention when implant trajectory is incompatible with traditionally designed screw- retained crowns. This study aimed to evaluate the fracture toughness of monolithic zirconia screw-retained implant-supported single crowns bonded to Ti bases with straight and angulated screw channel designs. A total of 30 maxillary left central incisor crowns were fabricated from monolithic gradiated translucency zirconia. Crowns were bonded to one of three corresponding Ti base interfaces (n = 10); 2 straight channel Ti bases (Straumann Variobase and Dess Ti Base) and 1 Ti base indicated for ASC crowns (Dess AngleBase). Mechanical loads up to 700 N were applied to the palatal aspect of assembled restorations at a 35° angle and force-displacement data were recorded. Excluding one instance of early failure, 100% of crowns remained intact through loading up to 700 N. Visible plastic deformation of the screw and Ti base was identified at this level of loading. At a load of 200 N, which is within the average clinical range for the anterior maxilla maximum force, the resistance to deflection of samples was not significantly different across all categories of Ti base (P > .05). In this study, incorporating an ASC into monolithic zirconia crowns did not impact fracture incidence at physiologic loading limit of 700 N when compared to similar restorations with traditional straight screw channels. The metallic components of screw-retained crowns appear to deform at loads below those where zirconia fracture is expected using the design studied.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/86837"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["dentistry","bioengineering"],"dc:title":["Load Resistance of Monolithic Zirconia Screw-Retained Implant-Supported Single Crowns with Straight and Angulated Screw Channel Designs"],"dc:type":["Text","Thesis"]},"updated_at":"2026-07-27T19:05:37Z"}