{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:1473"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:1473","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 maxillary incisors, restored with different kinds of full veneers : an in-vitro study","abstract":"In this study, the survival rate and fracture strength of different kinds of ceramic full veneers, fabricated with a new experimental press ceramic (EPC), were evaluated after exposure to the artificial mouth.
Eighty, caries-free human maxillary central molars were used as abutments for the full veneers. The teeth were randomly divided into one control group and four test-groups of 16 samples each. In control group A, unprepared teeth served as a control. In the test groups, four different types of full veneer preparations were performed. In test group B, the preparation was maintained in enamel and the contact point was on the tooth. In test group C, the preparation was maintained in enamel and the contact point was on the veneer. In test group D, the preparation was extended into dentin and the contact point was on the tooth. In test group E, the preparation was extended into dentine and the contact point was on the veneer. In all test groups, heat-pressed glass ceramic was used for the fabrication of the porcelain veneers. They were luted using Variolink II (Ivoclar-Vivadent AG, Schaan, FL). All samples were exposed to the artificial mouth.
After exposure in the artificial mouth, a survival rate of the veneers of 81-100% was reported among the different groups, but no failures of the ceramic materials could be recognised. The mean fracture strength in group A was 586.34 N, for group B 611.9 N, for group C 570.1 N, for group D 523.4 N and for group E 475.6 N.
Among the different groups no statistically significant differences were found. All mean values obtained were within the limits of clinical acceptance, indicating that the use of full veneers and the EPC is acceptable. Furthermore, it seems to be preferable to maintain the contact point of the adjacent tooth on the tooth structure. Thus, it may result in reduced crack formatio.","abstract_html":"In this study, the survival rate and fracture strength of different kinds of ceramic full veneers, fabricated with a new experimental press ceramic (EPC), were evaluated after exposure to the artificial mouth. <br>Eighty, caries-free human maxillary central molars were used as abutments for the full veneers. The teeth were randomly divided into one control group and four test-groups of 16 samples each. In control group A, unprepared teeth served as a control. In the test groups, four different types of full veneer preparations were performed. In test group B, the preparation was maintained in enamel and the contact point was on the tooth. In test group C, the preparation was maintained in enamel and the contact point was on the veneer. In test group D, the preparation was extended into dentin and the contact point was on the tooth. In test group E, the preparation was extended into dentine and the contact point was on the veneer. In all test groups, heat-pressed glass ceramic was used for the fabrication of the porcelain veneers. They were luted using Variolink II (Ivoclar-Vivadent AG, Schaan, FL). All samples were exposed to the artificial mouth. <br>After exposure in the artificial mouth, a survival rate of the veneers of 81-100% was reported among the different groups, but no failures of the ceramic materials could be recognised. The mean fracture strength in group A was 586.34 N, for group B 611.9 N, for group C 570.1 N, for group D 523.4 N and for group E 475.6 N. <br>Among the different groups no statistically significant differences were found. All mean values obtained were within the limits of clinical acceptance, indicating that the use of full veneers and the EPC is acceptable. Furthermore, it seems to be preferable to maintain the contact point of the adjacent tooth on the tooth structure. Thus, it may result in reduced crack formatio.","abstract_has_math":false,"creators":["Stathopoulou, Nektaria"],"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":"2026-07-24T02:22:16Z","subjects":["Überlebensrate","Frakturresistenz","Presskeramik","Künstlichen Mund","Survival rate","fracture strength"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/1473","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":["Stathopoulou, Nektaria"]}]},{"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":["Überlebensrate","Frakturresistenz","Presskeramik","Künstlichen Mund","Survival rate","fracture strength"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In this study, the survival rate and fracture strength of different kinds of ceramic full veneers, fabricated with a new experimental press ceramic (EPC), were evaluated after exposure to the artificial mouth.
Eighty, caries-free human maxillary central molars were used as abutments for the full veneers. The teeth were randomly divided into one control group and four test-groups of 16 samples each. In control group A, unprepared teeth served as a control. In the test groups, four different types of full veneer preparations were performed. In test group B, the preparation was maintained in enamel and the contact point was on the tooth. In test group C, the preparation was maintained in enamel and the contact point was on the veneer. In test group D, the preparation was extended into dentin and the contact point was on the tooth. In test group E, the preparation was extended into dentine and the contact point was on the veneer. In all test groups, heat-pressed glass ceramic was used for the fabrication of the porcelain veneers. They were luted using Variolink II (Ivoclar-Vivadent AG, Schaan, FL). All samples were exposed to the artificial mouth.
After exposure in the artificial mouth, a survival rate of the veneers of 81-100% was reported among the different groups, but no failures of the ceramic materials could be recognised. The mean fracture strength in group A was 586.34 N, for group B 611.9 N, for group C 570.1 N, for group D 523.4 N and for group E 475.6 N.
Among the different groups no statistically significant differences were found. All mean values obtained were within the limits of clinical acceptance, indicating that the use of full veneers and the EPC is acceptable. Furthermore, it seems to be preferable to maintain the contact point of the adjacent tooth on the tooth structure. Thus, it may result in reduced crack formatio.","Ziel dieser Studie war die Bestimmung der Überlebensrate und Frakturresistenz unterschiedlicher Arten von Vollveneers, nach Exposition im künstlichen Mund, hergestellt mittels einer neuen experimentellen Presskeramik (EPC).
Als Ankerzähne für die Vollveneers dienten 80 kariesfreie menschliche Oberkiefer-Zähne. Die Zähne wurden mittels des Zufallsprinzips in eine Kontrollgruppe und 4 Testgruppen zu jeweils 16 Zähnen aufgeteilt. In Gruppe A dienten unpräparierte Zähne als Kontrollgruppe. In den Testgruppen wurden 4 unterschiedliche Arten von Vollveneer- Präparationen vollzogen. In Testgruppe B waren die Präparation vorwiegend im Schmelz und der Kontaktpunkt auf der natürlichen Zahnhartsubstanz. In Testgruppe C war die Präparation vorwiegend im Schmelz und der Kontaktpunkt war auf der Zahnhartsubstanz. In der Testgruppe E reichte die Präparation bis in das Dentin und der Kontaktpunkt war auf dem Veneer. In allen Testgruppen wurde für die Anfertigung der Keramischen Veneers eine Presskeramik verwendet. Die adhäsive Befestigung fand mittels Variolink statt. Danach wurden alle Proben dem künstlichen Mund ausgesetzt.
Nach der Exposition im künstlichen Mund wurde eine Überlebensrate von 81-100% in den verschiedenen Testgruppen und keine Misserfolge des keramischen Materials beobachtet. Die durchschnittliche Frakturresistenz in Gruppe A war 586.34 N, für Gruppe B 611.9 N, für Gruppe C 570.1 N, für Gruppe D 523.4 N und für Gruppe E 475.6 N.
Innerhalb der verschiedenen Gruppen war kein statistisch signifikanter Unterschied festzustellen. Alle so erhaltenen Durchschnitteswerte waren innerhalb der klinischen Akzeptanz und zeigten somit, dass die Anwendung von Vollveneers und von EPC vertretbar ist. Weiterhin scheint vorzuziehend den Kontaktpunkt auf dem Zahn zu belassen, da so Rissbildungen reduziert werden können."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Survival rate and fracture strength of maxillary incisors, restored with different kinds of full veneers : an in-vitro study","Überlebensrate and Frakturresistenz unterschiedlicher Arten von Vollveneers : eine in-vitro Studie"]}]}],"canonical_facts":{"dc:contributor":["Strub, Jörg-Rudolf"],"dc:creator":["Stathopoulou, Nektaria"],"dc:description.abstract":["In this study, the survival rate and fracture strength of different kinds of ceramic full veneers, fabricated with a new experimental press ceramic (EPC), were evaluated after exposure to the artificial mouth.
Eighty, caries-free human maxillary central molars were used as abutments for the full veneers. The teeth were randomly divided into one control group and four test-groups of 16 samples each. In control group A, unprepared teeth served as a control. In the test groups, four different types of full veneer preparations were performed. In test group B, the preparation was maintained in enamel and the contact point was on the tooth. In test group C, the preparation was maintained in enamel and the contact point was on the veneer. In test group D, the preparation was extended into dentin and the contact point was on the tooth. In test group E, the preparation was extended into dentine and the contact point was on the veneer. In all test groups, heat-pressed glass ceramic was used for the fabrication of the porcelain veneers. They were luted using Variolink II (Ivoclar-Vivadent AG, Schaan, FL). All samples were exposed to the artificial mouth.
After exposure in the artificial mouth, a survival rate of the veneers of 81-100% was reported among the different groups, but no failures of the ceramic materials could be recognised. The mean fracture strength in group A was 586.34 N, for group B 611.9 N, for group C 570.1 N, for group D 523.4 N and for group E 475.6 N.
Among the different groups no statistically significant differences were found. All mean values obtained were within the limits of clinical acceptance, indicating that the use of full veneers and the EPC is acceptable. Furthermore, it seems to be preferable to maintain the contact point of the adjacent tooth on the tooth structure. Thus, it may result in reduced crack formatio.","Ziel dieser Studie war die Bestimmung der Überlebensrate und Frakturresistenz unterschiedlicher Arten von Vollveneers, nach Exposition im künstlichen Mund, hergestellt mittels einer neuen experimentellen Presskeramik (EPC).
Als Ankerzähne für die Vollveneers dienten 80 kariesfreie menschliche Oberkiefer-Zähne. Die Zähne wurden mittels des Zufallsprinzips in eine Kontrollgruppe und 4 Testgruppen zu jeweils 16 Zähnen aufgeteilt. In Gruppe A dienten unpräparierte Zähne als Kontrollgruppe. In den Testgruppen wurden 4 unterschiedliche Arten von Vollveneer- Präparationen vollzogen. In Testgruppe B waren die Präparation vorwiegend im Schmelz und der Kontaktpunkt auf der natürlichen Zahnhartsubstanz. In Testgruppe C war die Präparation vorwiegend im Schmelz und der Kontaktpunkt war auf der Zahnhartsubstanz. In der Testgruppe E reichte die Präparation bis in das Dentin und der Kontaktpunkt war auf dem Veneer. In allen Testgruppen wurde für die Anfertigung der Keramischen Veneers eine Presskeramik verwendet. Die adhäsive Befestigung fand mittels Variolink statt. Danach wurden alle Proben dem künstlichen Mund ausgesetzt.
Nach der Exposition im künstlichen Mund wurde eine Überlebensrate von 81-100% in den verschiedenen Testgruppen und keine Misserfolge des keramischen Materials beobachtet. Die durchschnittliche Frakturresistenz in Gruppe A war 586.34 N, für Gruppe B 611.9 N, für Gruppe C 570.1 N, für Gruppe D 523.4 N und für Gruppe E 475.6 N.
Innerhalb der verschiedenen Gruppen war kein statistisch signifikanter Unterschied festzustellen. Alle so erhaltenen Durchschnitteswerte waren innerhalb der klinischen Akzeptanz und zeigten somit, dass die Anwendung von Vollveneers und von EPC vertretbar ist. Weiterhin scheint vorzuziehend den Kontaktpunkt auf dem Zahn zu belassen, da so Rissbildungen reduziert werden können."],"dc:format.medium":["application/pdf"],"dc:subject":["Überlebensrate","Frakturresistenz","Presskeramik","Künstlichen Mund","Survival rate","fracture strength"],"dc:title":["Survival rate and fracture strength of maxillary incisors, restored with different kinds of full veneers : an in-vitro study","Überlebensrate and Frakturresistenz unterschiedlicher Arten von Vollveneers : eine in-vitro Studie"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:22:16Z"}