Journal of Dental Research, Vol 72, 490-494, Copyright © 1993 by International & American Associations for Dental Research Online Journals
Influence of dentinal fluid and stress on marginal adaptation of resin composites
I. Krejci, M. Kuster and F. Lutz
Department of Preventive Dentistry, Periodontology and Cariology, Zurich University, Switzerland.
The influence of dentinal fluid and of a number of stress procedures on the
quality of the margins of class V restorations located in both enamel and
dentin was quantitatively assessed in vitro with the aid of a scanning
electron microscope. The materials tested were GLUMA 2000 experimental,
Prisma Universal Bond 3, and Syntac, together with the fine hybrid
composites supplied by the respective manufacturers (Pekafill, AP.H, and
Tetric). All materials achieved over 95% of "continuous margin" in enamel
before and after stressing. In dentin, the initial values, with as well as
without dentinal fluid simulation, were situated between 93.2 and 98.2%.
With GLUMA 2000 experimental after stressing, a "continuous margin"
occurred in only 50.2%, but with Prisma Universal Bond 3 and Syntac, the
value was 79.0%. The influence of dentinal fluid simulation was dependent
on the dentinal adhesive used. The effects of the various stress procedures
were not significantly different.
