الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 147 |  |  |
| | | from | 147 | | |
Abstract
This research was designed to study the strain analysis and fracture resistance of zirconium FPDs with pier abutments using different designs.
A right maxillary first premolar and first molar were removed from the upper arch of an acrylic typodent. The socket of the upper lateral was closed with pink modeling wax to simulate an edentulous area of a missing first premolar and first molar bounded by maxillary right canine, second premolar (pier), and second molar acrylic teeth. Each tooth was prepared to receive a full coverage all-ceramic retainer.
A total of 30 all-ceramic zirconia bridges were constructed and divided according to bridge design in to three groups(10 bridges each);fixed-fixed design (10 samples),non-rigid design (10 samples),and cantilever design (10 samples).
Each group was made to measure;1 strain gauge analysis at 300 N, 2 strain gauge analysis at fracture load, 3 fracture resistance loading.
The fitting surface of the retainers were sandblasted with 50 μm AL2O3 at maximum pressure of 2.5 bar for 30 seconds at an approximate distance 2 cm.
Thirty epoxy resin (Chemapoxy 150 Transparent) dies were fabricated by introducing the polymerizing resin into a polyvinylsiloxane mold (KERR Extrude Medium) of the master dies. The adhesive resin Metacem was used for cementation of the restorations. The restorations were seated slowly with gentle finger pressure then seated in the lower compartment of cement loading device under (1.5 Kg) load for one minute. Excess luting material was removed with sponge pellets immediately, and each cement surface/margin was light cured for 40 seconds.