Journal of Dental Research, Vol 63, 1392-1395, Copyright © 1984 by International & American Associations for Dental Research Online Journals
Cement distribution and bond strength in cemented posts
M. Goldman, R. DeVitre and J. Tenca
Rods of lucite were drilled to receive a No. 5 parapost to a depth of 4 mm
and 7 mm. Posts were fitted and cemented either by coating the post with
cement or by placing the cement in the prepared hole with a lentulo spiral
in a low-speed hand-piece and then inserting the pre-coated post.
Photographs were taken to determine the distribution of the cement. The
lentulo spiral distributed the cement along the entire length of the
preparation, but coating alone did not distribute the cement evenly. The
tensile strength with these two methods of post cementation was also
compared in four groups of extracted teeth. In Groups IA and IIA, the post
preparation was rinsed with 2 ml of 5.25% NaOCl and dried with paper points
and blasts of air. In Group IA, the post was coated with zinc phosphate
cement and seated. In Group IIA, the cement was placed into the post space
with a lentulo spiral in a slowly rotating hand-piece; the post was then
coated and seated. In Groups IB and IIB, the post preparation was rinsed
with 1 ml of 17% Na2 EDTA followed by 1 ml of 5.25% NaOCl to remove the
smeared layer at the dentin-cement interface. The posts were then cemented
as in IA and IIA. Under the conditions of this experiment, the following
conclusions can be drawn: Placing cement into the preparation with a
lentulo spiral increased the tensile strength and the overall cement
distribution.(ABSTRACT TRUNCATED AT 250 WORDS)
