Abstract
Statement
of the problem: Post retention is crucial factor in restoration
survival. Posts are commonly failed due to loss of retention. It is
unknown which luting agents would provide the maximum bond strength for
Locator overdenture posts. Aim: The aim of this study was to evaluate
the bond retentive strengths of Locator overdenture posts cemented with 7
luting agents. Materials and methods: One hundred and five single
rooted human teeth were decoronated and randomly assigned to 7 groups (n
= 15). Post spaces were prepared with Locator post drills to the depth
of 6 mm. The Locator posts were cemented with Variolink II, RelyX ARC,
Multilink N, RelyX Unicem, ParaCore, or MultiCore Flow resin luting
agents. Zinc phosphate cement was served as control group. Specimens
were stored in water at 37°C for 24 hours. Each specimen was loaded in
tension in an Instron universal testing machine. The maximum force
required to dislodge each Locator post was recorded. Means and standard
deviations were calculated and data were statistically analyzed with
one-way analysis of variance (ANOVA). Results: The highest mean bond
strength value for Locator posts was recorded for MultiCore(®) Flow
group (mean = 550.1 N), while the lowest mean value was for RelyX
Unicem(™) resin cement group (mean = 216.8 N). A statistically
significant difference in mean locator overdenture post bond strength
was observed between the 7 cement types (p < 0.0001). ParaCore(™) and
MultiCore(®) Flow groups had significantly higher bond strength than
all other groups, but they were not differed from each other.
Conclusion: Bond strength of Locator overdenture posts were influenced
by the type of luting agents. MultiCore Flow and ParaCore resin cements
offered the greatest retention. Clinical significance: The type of
luting agents had a significant effect on the retention of Locator
posts. The use of Core buildup resin cements as luting agent with
Locator post demonstrated the greatest retention.
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