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The Effect of Finish Line Design on the Fracture Strength of Zirconia Copings | ||
| Journal of Dentistry | ||
| مقاله 7، دوره 20، شماره 4 - شماره پیاپی 65، اسفند 2019، صفحه 271-275 اصل مقاله (382.74 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.30476/dentjods.2019.77720. | ||
| نویسندگان | ||
| Zahra Hashemi Ardakani1؛ Sahar Khorsandipour2؛ Mina Mohghegh* 1؛ Seyed Ahmad Ghoreishian1؛ Amir Ali Reza Khaledi1 | ||
| 1Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. | ||
| 2Undergraduate Student of Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. | ||
| چکیده | ||
| Statement of the Problem: One of the major concerns about all ceramic crowns is their fracture resistance. Purpose: The purpose of this in vitro study was to evaluate the effect of two marginal designs (shoulder 90°, shoulder 135°) on the fracture resistance of zirconia copings. Materials and Method: In this in vitro study, 20 brass dies were prepared using milling machine: 10 with 1mm width shoulder 90° marginal design and the other 10 with 1mm width shoulder 135° finish line design. Zirconia cores with 0.5mm thickness and 30μm cement space were fabricated on brass dies. The copings were cemented on the dies and fracture test was done using a universal testing machine. Data were analyzed using Mann-Whitney test. Results: The mean value of fracture resistance for shoulder 90° finish line design were 368.3±109.4 N and for shoulder 135° finish line design were 518.4±115.5 N. Data analysis revealed a statistically significant difference between groups (p < 0.05). Conclusion: The results of this study showed that the finish line design of zirconia copings influences their fracture resistance. A 135° shoulder finish line design can improve the fracture resistance of zirconia crowns. | ||
| کلیدواژه‌ها | ||
| Zirconia ● Preparation ● Fracture Strength ● CAD/CAM | ||
| مراجع | ||
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