Retention af rodstifter: effekt af retentionscement, cementfilmtykkelse og forbehandling af
rodstiften
Sammanfattning
Introduction and purpose -The retention of root canal posts can be obtained through
micromechanical "interlocking" of traditional cements in the surface of the post and the dentin or
through adhesive bonding of resin cements. The aim of this study was to investigate the effect of
cement film thickness of a zinc phosphate or a resin cement on retention of untreated and pretreated
root canal posts.
Material and methods - Prefabricated zirconia posts (CosmoPost; 1.4 mm) and two types of luting
cements (a zinc phosphate cement (DeTrey Zinc) and a self-etch adhesive resin cement (Panavia
F2.0) were used. After removal of the crowns of 360 extracted premolars, canines, or incisors, the
root canals were prepared with a parallel-sided drill system to three different final diameters. Half of
the posts did not receive any pretreatment. The other half of the posts received tribochemical silicate
coating according to the manufacturer’s instructions. Posts were then luted in the prepared root
canals (n = 30/group). Following water storage at 37°C for 7 days, retention of the posts was
determined by the pull-out method.
Results and conclusion - Irrespective of the luting cement, pretreatment with tribochemical silicate
coating significantly increased retention of the posts. Increased cement film thickness resulted in
decreased retention of untreated posts, at least up to a certain cement film thickness, and of
pretreated posts luted with zinc phosphate cement. Increased cement film thickness had no influence
on retention of pretreated posts luted with resin cement. Thus, retention of the posts was influenced
by the type of luting cement, by the cement film thickness, and by the post pretreatment