الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Aim: The implant supported overdentures with unsplinted stud attachments improve the quality of
life and increase patient satisfaction. This study aims to compare the retention and evaluate the wear
behavior between one of the most common stud attachments used “Locator” and a new one
“Novaloc” for implanted supported mandibular overdenture.
Methodology: Two ready-made epoxy resin models represented completely edentulous patients
were prepared to receive two implant analogues in the canine area. Two different attachment
systems were used in this study: the first one was Locator attachment with its nylon matrix and
metal housing; the second one was Novaloc with its PEEK matrix, and divided randomly into two
groups; Locator group and Novaloc group. Two overdentures were constructed for each group. The
pick-up proceeded as conventional method. Universal testing machine was used to measure the
retention of each attachment. Chewing simulator exerted multiple cycles mimicking the insertion
and removal of the overdentures at the baseline, 500 cycles, 1000 cycles, 1500 cycles and 2000
cycles. Digital microscope was used to evaluate the wear behavior of each attachment during these
different cyclic loading.
Results: Regarding retention was performed by using Independent t-test which revealed that
retention of group I (Locator) was significantly higher (P<0.05) than group II (Novaloc) at baseline,
500 cycles, 1000 cycles, 1500 cycles and 2000 cycles. Comparison between mean difference of
wear (wear changes) of both groups was performed by using Independent t-test which revealed in
the overall changes group I (Locator) was significantly higher than group II (Novaloc).
Conclusion: The Locator showed higher initial retention than Novaloc. Regarding wear behavior,
Novaloc showed lesser wear and changes than Locator attachment.