[In vitro fracture resistance tests of 3-unit posterior bridges produced by the Procera process]. / In-vitro-Bruchlasttests von 3-gliedrigen Seitenzahnbrücken hergestellt im Procera-Verfahren.
Schweiz Monatsschr Zahnmed
; 114(3): 207-13, 2004.
Article
en De
| MEDLINE
| ID: mdl-15106499
The aim of this investigation was to evaluate the fracture resistance of three-unit fixed partial dentures manufactured with the Procera-System in vitro. Metal abutments representing the teeth 25 and 27 were prepared with a 90 degrees circumferential internally rounded shoulder. The abutments were duplicated with polyvinysiloxane, and master dies were fabricated. Using the Procera-System, 21 aluminiumoxid frameworks were manufactured. Twelve of these were veneered with porcelain in a standardized manner. All non-veneered and veneered frameworks were cemented on the original metal abutments and loaded to fracture. The mean fracture loads of the non-veneered and veneered frameworks were 477 N and 645 N, respectively. The Weibull modules of the test series were 4.7 for the non-veneered and 4.0 for the veneered frameworks. The in vitro results of this investigation seem to indicate that the use of fixed partial dentures manufactured with the Procera-System are clinically questionable. Furthermore, the low Weibull modules point to a limited fracture predictability. Assuming that chewing forces up to 600 N may occur in the molar region and loading of dental ceramics causes fatigue and weakening over time, the clinical application may not be recommended.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Titanio
/
Diseño de Dentadura
/
Aleaciones de Cerámica y Metal
/
Fracaso de la Restauración Dental
/
Porcelana Dental
/
Dentadura Parcial Fija
Límite:
Humans
Idioma:
De
Revista:
Schweiz Monatsschr Zahnmed
Año:
2004
Tipo del documento:
Article
Pais de publicación:
Suiza