الفهرس 
Treatment modality for class IV kennedy classificationOnly 14 pages are availabe for public view
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Abstract
Abstract
Purpose: The aim of this study was to compare the retention and
fatigue resistance of one bar system with different clips modalities used in
restoring maxillary class IV kennedy .
Materials and methods: In-vitro study was carried out on acrylic resin
model representing maxillary partially edentulous class IV Kennedy classification ,
Silicon lining material was used to simulate periodontal ligament around the
abutment teeth .Bar attachment with diameter 50 mm length and 8.2 mm height
was placed on the crest of the ridge with adequate space under it on the acrylic
model and according to the type of material of the construction and number of
sleeve were classified in 2 equal groups. group I plastic clip with one versus two
clips . group II gold clip with one versus two clips. A metallic Partial overdentures
were constructed and placed on acrylic model then inserted in artificial saliva to
perform the required tests. Fatigue test was measured at 5500 cycles by using
chewing simulator machine then retention test was measured, initially and at
1100, 2200, 3300, 4400 and 5500 of denture insertion and removal by using
universal testing .
Result: The retention of 1 gold clip was significantly less than 2 gold
clips in vertical direction .Increasing the number of plastic clips in the
vertical direction did not significantly increase retention. There was no
significant difference between the retention value of 1 gold clip and plastic
clips. The retention of 2 gold clips is more than 2 plastic clips.
Conclusion : The highest retention values (initial and final) were noted with
gold clips and lowest retention values were noted with plastic clips.