{"id":{"repo_id":"umkc","oai_identifier":"oai:mospace.umsystem.edu:10355/11361"},"canonical_url":"https://search.dev.ndltd.org/etd/umkc/oai:mospace.umsystem.edu:10355/11361","repository":{"repo_id":"umkc","name":"University of Missouri - Kansas City","base_url":"https://mospace.umsystem.edu/oai/request"},"display":{"title":"The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings","abstract":"This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment.","abstract_html":"This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment.","abstract_has_math":false,"creators":["Darmitzel, Stephen Edward, 1981-"],"institution":"University of Missouri--Kansas City","degree_name":"M.S.","degree_level":"Masters","degree_discipline":"Oral Biology (UMKC)","degree_department":null,"school":null,"contributors":[],"advisors":["Nickel, Jeffrey C. (Jeffrey Charles), 1957-"],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-08-12","date_published":"2011-08-12","updated_at":"2026-07-24T05:16:44Z","subjects":[],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10355/11361","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Nickel, Jeffrey C. (Jeffrey Charles), 1957-"]},{"key":"dc:creator","label":"Author","values":["Darmitzel, Stephen Edward, 1981-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2011-08-12T15:22:10Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2011-08-12T15:22:10Z"]},{"key":"dc:date.issued","label":"Date","values":["2011-08-12"]},{"key":"dc:publisher","label":"Institution","values":["University of Missouri--Kansas City"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Oral Biology (UMKC)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Missouri--Kansas City"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10355/11361"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Title from PDF of title page, viewed on August 12, 2011","Thesis advisor: Jeffrey C. Nickel","Vita","Includes bibliographical references (p. 59-61)","Thesis (M.S.)--School of Dentistry. University of Missouri--Kansas City, 2011"]},{"key":"dc:description.abstract","label":"Abstract","values":["This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment."]},{"key":"dc:title","label":"Title","values":["The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings"]}]}],"canonical_facts":{"dc:contributor.advisor":["Nickel, Jeffrey C. (Jeffrey Charles), 1957-"],"dc:creator":["Darmitzel, Stephen Edward, 1981-"],"dc:date.accessioned":["2011-08-12T15:22:10Z"],"dc:date.available":["2011-08-12T15:22:10Z"],"dc:date.issued":["2011-08-12"],"dc:description":["Title from PDF of title page, viewed on August 12, 2011","Thesis advisor: Jeffrey C. Nickel","Vita","Includes bibliographical references (p. 59-61)","Thesis (M.S.)--School of Dentistry. University of Missouri--Kansas City, 2011"],"dc:description.abstract":["This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment."],"dc:identifier.uri":["http://hdl.handle.net/10355/11361"],"dc:language.iso":["en_US"],"dc:publisher":["University of Missouri--Kansas City"],"dc:title":["The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings"],"dc:type":["Thesis"],"thesis:degree_discipline":["Oral Biology (UMKC)"],"thesis:degree_level":["Masters"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Missouri--Kansas City"]},"updated_at":"2026-07-24T05:16:44Z"}