Effect of gingival displacement cord and cordless systems on the closure, displacement, and inflammation of the gingival crevice
Available online 9 October 2015
Abstract
Statement of problem
The
gingival sulcus should remain open long enough for the impression
material to flow into it and completely fill the space provided by the
gingival displacement. Impressions with less sulcal width have a higher
incidence of voids, tearing of impression materials, and reduction in
marginal accuracy.
Purpose
The
purpose of this study was to investigate the closure, gingival
displacement, and gingival inflammation of the gingival crevice after
the use of medicated gingival displacement cord and cordless systems.
Material and methods
Gingival
sulcus closure was studied in 40 participants. They were divided into 4
groups: 2 cord (Ultrapack, SilTrax AS) and 2 cordless (Expasyl,
Traxodent Hemodent paste) methods. The labial surfaces of the maxillary
right and left central incisors were evaluated. Gingival sulcus was
photographed every 20 seconds from 0 to 180 seconds after the removal of
the cord or cordless system. The bleeding index (BI) and gingival index
(GI) were measured at day 0, day 1, and day 7. The width of the sulcal
orifice was measured at the mid-buccal (MB) and transitional line angle
(TLA) on a digital image, using computer software (Photoshop version
7.0; Adobe). Data were analyzed with ANOVA, Tukey honest significant
difference (HSD), Kruskal-Wallis, and Mann-Whitney U tests (α=.05).
Results
All
groups showed a sulcal width greater than 0.22 mm up to 60 seconds
after the removal of the displacement materials at the MB and up to 40
seconds at the TLA. Among all groups, Expasyl showed the fastest
closure. Gingival displacement in the MB area for the cord group was
greater than for the cordless groups. GI and BI indices were larger for
the cord group than for the cordless group at days 0 and 1.
Conclusions
At
up to 60 seconds, the cord and cordless techniques were equally
effective. The cord group showed a greater amount of displacement than
the cordless group. However, the cordless materials showed reduced
frequency of changes to the gingival index.
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