الفهرس | Only 14 pages are availabe for public view |
Abstract Restoration of teeth after endodontic treatment and hemisection and root resection is an integral part of restorative practice in dentistry. As these teeth are affected by a higher risk of biomechanical failure compared to vital and sound ones, a plethora of articles have been written in the dental literature regarding the prosthodontic management of periodontal affected teeth by endodontic treatment and hemisection . Many of these papers have discussed techniques of fabricating posts and cores, whereas others presented clinical and laboratory data that help to answer questions regarding the best prosthodontic treatment for these teeth. The purpose of this study was to evaluate the fracture resistance of hemisectioned mandibular molar after resection of mesial root restored with different post systems. A total of thirty sound extracted lower first molars and thirty sound extracted lower second premolars will be collected. Teeth washed under running water for several seconds and stored in normal saline solution till use. Distal root canal of molars will be endodontically treated and obturated by lateral condensation with gutta percha and eugenol free root canal sealer. The samples was grouped to three main group according to the type of the post system into group A for cast metal post and core (n = 20), group B for prefabricated fiber post and composite core and group C for custom made fiber post (ever stick) and composite core (n = 20).Then each main group was divided into two subgroups one of them was cemented by total etch resin cement (n=10) and anther cemented by self adhesive resin cement (n=10). All teeth were prepared by C.N.C milling machine (computer numerical control), then each prepared hemisecred molar and premolar were mounted in epoxy resin blocks by using silicone key (a vinyl polysiloxane impression material). Then all bridges was fabricated by using wax dipping technique in silicone index then , metal bridges frame work was casted ,finished and polished . Then the specimens were subjected to dynamic loading before testing. Statical analysis of the results revealed that post type had a statically significant while the cement type was non – statically significant. |