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Information Journal Paper

Title

COMPARISON OF TWO PREPARATION DESIGNS OF SHOULDER AND CHAMFER ON THE FRACTURE RESISTANCE OF FELDESPATIC CROWN MADE WITH CAD/CAM

Pages

  483-491

Abstract

 Background and Objective: One of the most importantevaluations of fixed restoration is their strength and resistance tofracture which has important role on their longevity andperformance. The aim of this in vitro study was to evaluate theeffect of two different preparation designs (shoulder andchamfer) on the fracture resistance of feldespatic crowns madewith CAD/ CAM. Materials and Methods: This study was undertaken using 20machined stainless steel dies (10 samples for chamfer and 10samples for shoulder) with 7 mm height, 5 mm diameter and 10´ axial walls canvergency in two finish line designs of 50´ chamfer (0. 8 mm depth) and 90´ shoulde (1 mm depth). Twentyimpressions were taken using a polyvinylsiloxane and pouredwith vacuum– mixed type 4 dental stone. Twenty first premolarfeldespatic (cerec blocs) crowns were made with CAD/CAM. Each crown was cemented on its definitive stainless steel dyewith clearfil SA luting and underwent a fracture test with auniversal testing machine. Results: The mean value of fracture resistance for chamfermargins were 771. 40± 99. 47 N and for the shoulder marginswere 782. 30 ±129. 40 N. The student’ s t-test did not reveal astatistically significant different between two groups (P=0. 835)Conclusion: The results indicate that marginal design of thefeldespatic crowns do not effect their fracture resistance andselection of finish line designs should be based on clinicalcondition of the restored tooth.

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  • Cite

    APA: Copy

    ZAKAVI, FARAMARZ, GHANATIR, ELHAM, GHASEMI, ROGHEYEH, & MERIKH, MAH. (2017). COMPARISON OF TWO PREPARATION DESIGNS OF SHOULDER AND CHAMFER ON THE FRACTURE RESISTANCE OF FELDESPATIC CROWN MADE WITH CAD/CAM. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, 16(4 ), 483-491. SID. https://sid.ir/paper/12897/en

    Vancouver: Copy

    ZAKAVI FARAMARZ, GHANATIR ELHAM, GHASEMI ROGHEYEH, MERIKH MAH. COMPARISON OF TWO PREPARATION DESIGNS OF SHOULDER AND CHAMFER ON THE FRACTURE RESISTANCE OF FELDESPATIC CROWN MADE WITH CAD/CAM. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL[Internet]. 2017;16(4 ):483-491. Available from: https://sid.ir/paper/12897/en

    IEEE: Copy

    FARAMARZ ZAKAVI, ELHAM GHANATIR, ROGHEYEH GHASEMI, and MAH MERIKH, “COMPARISON OF TWO PREPARATION DESIGNS OF SHOULDER AND CHAMFER ON THE FRACTURE RESISTANCE OF FELDESPATIC CROWN MADE WITH CAD/CAM,” JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, vol. 16, no. 4 , pp. 483–491, 2017, [Online]. Available: https://sid.ir/paper/12897/en

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