EFFECT OF MODIFIED COPING DESIGN ON FRACTURE RESISTANCE OF ZIRCONIA CROWN | ||||
| Mansoura Journal of Dentistry | ||||
| Article 11, Volume 6, Issue 2, April 2019, Page 64-66 PDF (458.52 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjd.2019.199188 | ||||
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| Abstract | ||||
| Aim of the study: To determine the effect of modified coping designs on the fracture resistance of zirconia crowns. Materials and methods:Extracted human maxillary first premolar teeth were prepared to receive all-ceramic zirconia crown. Teeth were divided into two main groups according to the coping design. Group (Ι) (n=7) with Conventional zirconia coping extends to the finish line of the preparation. Group (ΙΙ) (n=7) with cut-back zirconia coping 2 mm short from the finish line buccally. All specimens were veneered by the traditional hand-layering technique. Crowns were cemented by self-adhesive resin cement. Then, subjected to artificial aging; thermal cycling and cyclic loading before they were loaded in a universal testing machine for fracture resistance. Data were analyzed with Student's t-test. Results:There was no significant difference in the mean fracture load values between conventional (477.71 ±28.13 N) and cut-back coping designs (473.29 ±35.22 N). Conclusion:Modifications in coping design didn't improve the fracture resistance of zirconia crowns. | ||||
| Keywords | ||||
| zirconia; coping design; cut-back | ||||
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