Journal of Dental Research, Vol 70, 975-978, Copyright © 1991 by International & American Associations for Dental Research Online Journals
Dentinal fluid movement associated with loading of restorations
K. Hirata, M. Nakashima, I. Sekine, Y. Mukouyama and K. Kimura
Department of Operative Dentistry, Asahi University, School of Dentistry, Gifu, Japan.
Post-operative biting sensitivity is a significant clinical problem after
placement of posterior resin composites and may be due to dentinal fluid
movement. The occlusal surfaces of extracted teeth were filled with amalgam
(control) or various posterior resin composites, and the movement of the
dentinal fluid induced by the loading of the restorations was studied. In
addition, the firing of pulpal nerves induced by the loading of class 5
resin composite restorations in canine teeth of dogs was also investigated.
When the entire cavity was etched with an acid gel and then filled with
resin composite, dentinal fluid movement in response to loading was
significantly (p less than 0.01) greater than in the amalgam-filled or
unoperated controls. The dog canine tooth filled with resin composite
showed firing of pulpal nerves when loaded. These results suggest that the
movement of dentinal fluid induced by masticatory pressure on resin
composite restorations may elicit biting sensitivity.
