Survival rate and fracture strength of maxillary incisors, restored with different kinds of full veneers : an in-vitro study

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&#61666; 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.

Author dc:creator

• Stathopoulou, Nektaria

Contributors dc:contributor

• Strub, Jörg-Rudolf

• Überlebensrate
• Frakturresistenz
• Presskeramik
• Künstlichen Mund
• Survival rate
• fracture strength

Repository record source_url

https://freidok.uni-freiburg.de/data/1473

OAI identifier oai:identifier

oai:freidok.uni-freiburg.de:1473