{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:196"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:196","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Survival rate and fracture strength of endodontically treated crowned maxillary incisors with severe defects, restored with different post and core systems after exposure to the artificial mouth.","abstract":"Sixty-four caries-free maxillary incisors were randomly selected for similar size and quality prospectives, were endodontically treated and received a 1.2 mm circular shoulder preparation with a subjective convergence angle of 6°. The crown was cut off 2 mm above the cemento-enamel junction. The samples were randomly divided into 4 groups: cast gold post and core (Control group I), titanium posts and composite cores (Test group II), zirconium posts with composite cores (Test group III), zirconia posts and heat pressed glass ceramic cores (Test group IV). All the posts were adhesively luted using a resin cement. All the samples received full coverage metal crowns, cemented with glass ionomer cement. All samples were exposed to 1,200,000 chewing cycles at 30 N. The survival rate of the samples after exposure to the artificial oral environment was as follows: 87.5 group 1, 93.75 group 2 and 3, and 100 group 4. The mean fracture strengths and the standard deviations were as follows: 374.34 N (181.47) group 1, 429.36 N (150.16) group 2, 514.70 N (236.54) group 3, 516.34 N (139.76) group 4. The all ceramic post and core group is a reliable material for the restoration of non-vital maxillary anterior teeth with major tooth substance loss.","abstract_html":"Sixty-four caries-free maxillary incisors were randomly selected for similar size and quality prospectives, were endodontically treated and received a 1.2 mm circular shoulder preparation with a subjective convergence angle of 6°. The crown was cut off 2 mm above the cemento-enamel junction. The samples were randomly divided into 4 groups: cast gold post and core (Control group I), titanium posts and composite cores (Test group II), zirconium posts with composite cores (Test group III), zirconia posts and heat pressed glass ceramic cores (Test group IV). All the posts were adhesively luted using a resin cement. All the samples received full coverage metal crowns, cemented with glass ionomer cement. All samples were exposed to 1,200,000 chewing cycles at 30 N. The survival rate of the samples after exposure to the artificial oral environment was as follows: 87.5 group 1, 93.75 group 2 and 3, and 100 group 4. The mean fracture strengths and the standard deviations were as follows: 374.34 N (181.47) group 1, 429.36 N (150.16) group 2, 514.70 N (236.54) group 3, 516.34 N (139.76) group 4. The all ceramic post and core group is a reliable material for the restoration of non-vital maxillary anterior teeth with major tooth substance loss.","abstract_has_math":false,"creators":["Hussein, Amr ZA."],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Strub, Jörg-Rudolf"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:21:30Z","subjects":["Vollkeramische Aufbauten","Stiftkernaufbauten","Oberkieferfrontzähne","Post and core technique","Incisors","Anterior teeth crowns","Restoration of anterior teeth","All ceramic post and core system"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/196","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Strub, Jörg-Rudolf"]},{"key":"dc:creator","label":"Author","values":["Hussein, Amr ZA."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["DoctoralThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Vollkeramische Aufbauten","Stiftkernaufbauten","Oberkieferfrontzähne","Post and core technique","Incisors","Anterior teeth crowns","Restoration of anterior teeth","All ceramic post and core system"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Sixty-four caries-free maxillary incisors were randomly selected for similar size and quality prospectives, were endodontically treated and received a 1.2 mm circular shoulder preparation with a subjective convergence angle of 6°. The crown was cut off 2 mm above the cemento-enamel junction. The samples were randomly divided into 4 groups: cast gold post and core (Control group I), titanium posts and composite cores (Test group II), zirconium posts with composite cores (Test group III), zirconia posts and heat pressed glass ceramic cores (Test group IV). All the posts were adhesively luted using a resin cement. All the samples received full coverage metal crowns, cemented with glass ionomer cement. All samples were exposed to 1,200,000 chewing cycles at 30 N. The survival rate of the samples after exposure to the artificial oral environment was as follows: 87.5 group 1, 93.75 group 2 and 3, and 100 group 4. The mean fracture strengths and the standard deviations were as follows: 374.34 N (181.47) group 1, 429.36 N (150.16) group 2, 514.70 N (236.54) group 3, 516.34 N (139.76) group 4. The all ceramic post and core group is a reliable material for the restoration of non-vital maxillary anterior teeth with major tooth substance loss."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Survival rate and fracture strength of endodontically treated crowned maxillary incisors with severe defects, restored with different post and core systems after exposure to the artificial mouth.","Überlebensrate und Bruchfestigkeit wurzelbehandelter, überkronter Oberkieferfrontzähne mit großen Defekten, nach Versorgung mit verschiedenen Stiftkernaufbauten, nach Exposition im künstlichen Mund."]}]}],"canonical_facts":{"dc:contributor":["Strub, Jörg-Rudolf"],"dc:creator":["Hussein, Amr ZA."],"dc:description.abstract":["Sixty-four caries-free maxillary incisors were randomly selected for similar size and quality prospectives, were endodontically treated and received a 1.2 mm circular shoulder preparation with a subjective convergence angle of 6°. The crown was cut off 2 mm above the cemento-enamel junction. The samples were randomly divided into 4 groups: cast gold post and core (Control group I), titanium posts and composite cores (Test group II), zirconium posts with composite cores (Test group III), zirconia posts and heat pressed glass ceramic cores (Test group IV). All the posts were adhesively luted using a resin cement. All the samples received full coverage metal crowns, cemented with glass ionomer cement. All samples were exposed to 1,200,000 chewing cycles at 30 N. The survival rate of the samples after exposure to the artificial oral environment was as follows: 87.5 group 1, 93.75 group 2 and 3, and 100 group 4. The mean fracture strengths and the standard deviations were as follows: 374.34 N (181.47) group 1, 429.36 N (150.16) group 2, 514.70 N (236.54) group 3, 516.34 N (139.76) group 4. The all ceramic post and core group is a reliable material for the restoration of non-vital maxillary anterior teeth with major tooth substance loss."],"dc:format.medium":["application/pdf"],"dc:subject":["Vollkeramische Aufbauten","Stiftkernaufbauten","Oberkieferfrontzähne","Post and core technique","Incisors","Anterior teeth crowns","Restoration of anterior teeth","All ceramic post and core system"],"dc:title":["Survival rate and fracture strength of endodontically treated crowned maxillary incisors with severe defects, restored with different post and core systems after exposure to the artificial mouth.","Überlebensrate und Bruchfestigkeit wurzelbehandelter, überkronter Oberkieferfrontzähne mit großen Defekten, nach Versorgung mit verschiedenen Stiftkernaufbauten, nach Exposition im künstlichen Mund."],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:21:30Z"}