Abstract
Purpose
Limited
information is currently available relative to the effect of
masticatory loads on the retentive properties of Locator attachments.
The aims of this in vitro study were to assess and compare the effect of
simulated mastication on the retention of white, pink, and blue Locator
inserts for overdentures retained by 2 implants.
Materials and Methods
Thirty
specimens simulating a nonanatomic edentulous flat ridge with two
implants and an overdenture were divided into 3 groups according to the
color of the fitted insert: transparent clear group (n = 10), pink group
(n = 10), and blue group (n = 10). Retention forces were measured in an
axial direction initially and after 100,000 cycles of simulated
masticatory loads. One-way ANOVA followed by Tukey's post hoc tests were
used to compare retention values and percentage retention loss between
the 3 groups with significance set at p = 0.05.
Results
The
3 groups presented significant differences in retention at baseline
(9.95 ± 1.91 N, 15.43 ± 4.08 N, and 41.73 ± 9.29 N for the blue, pink,
and clear groups, respectively) and after simulated mastication (6.37 ±
2.64 N, 14.00 ± 3.89 N, 38.20 ± 5.11 N for the blue, pink, and clear
groups, respectively). Within the same group, cyclic loading did not
significantly affect retention in the clear and pink groups, while the
blue inserts showed a significant retention loss (-37%) after loading.
Conclusions
The
results suggest that short-term simulated mastication affects the
extra-light blue inserts but not the more-retentive inserts.
Comments