Journal of Dental Research, Vol 66, 1758-1764, Copyright © 1987 by International & American Associations for Dental Research Online Journals
Testing sealing properties of restorative materials against moist dentin
L. G. Terkla, A. C. Brown, A. P. Hainisch and J. C. Mitchem
Oregon Health Sciences University School of Dentistry, Portland 97201.
The objectives of this investigation were (1) to develop a sensitive
laboratory system that simulates the physiological and clinical conditions
of a prepared human tooth in order to facilitate the determination of the
bonding and sealing efficacies of restorative dental materials and (2) to
conduct experiments with two dentin bonding agents, two posterior composite
resin restorative materials (hybrid and microfilled), and a glass-ionomer
type II filling material. The system functioned well and provided data to
indicate that, after margination, the two posterior composite resin
restorative materials performed equally and both performed better than the
glass-ionomer filling material; none of the materials provided a perfect
seal immediately after insertion, although some restorations demonstrated
perfect seals from 16 hours to 28 days after placement; the seal of the
glass-ionomer material improved after 28 days of storage in buffer
solution; each successive step in the respective composite resin procedures
improved the seal except in one case for the microfilled resin.
