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Journal of Dental Research, Dental Clinics, Dental prospects، جلد ۱۰، شماره ۳، صفحات ۱۸۱-۱۸۸
عنوان فارسی
چکیده فارسی مقاله
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عنوان انگلیسی Effect of screw access hole preparation on fracture load of implant-supported zirconia-based crowns: an in vitro study
چکیده انگلیسی مقاله Background: Fracture load of implant-supported restorations is an important factor in clinical success. This study evaluated the effect of two techniques for screw access hole preparation on the fracture load of cement-screw retained implant-supported zirconia-based crowns. Methods: Thirty similar cement-screw retained implant-supported zirconia-based maxillary central incisor crowns were evaluated in three groups of 10. Group NH: with no screw access holes for the control. Group HBS: with screw access holes prepared machinery before zirconia sintering. Group HAS: with screw access holes prepared manually after zirconia sintering. In group HBS, the access holes were virtually designed and prepared by a computer assisted design/computer assisted manufacturing system. In group HAS, the access holes were manually prepared after zirconia sintering using a diamond bur. The dimensions of the screw access holes were equal in both groups. The crowns were cemented onto same size abutments and were then subjected to thermocycling. The fracture load values of the crowns were measured using a universal testing machine. The data were statistically analyzed using ANOVA and Tukey’s test (P< 0.05). Results: The mean fracture load value for the group NH was 888.37±228.92 N, which was significantly the highest among the groups (P< 0.0001). The fracture load values were 610.48±125.02 N and 496.74±104.10 N for the group HBS and HAS respectively, with no significant difference (P=0.44). Conclusions: Both used techniques for preparation of screw access holes in implant-supported zirconia-based crowns decreased the fracture load.
کلیدواژه‌های انگلیسی مقاله
نویسندگان مقاله هادی مختارپور | hadi mokhtarpour
dds, ms assistant professor, department of prosthodontics, faculty of dentistry, sari university of medical sciences, sari, iran


رضا افتخار آشتیانی | reza eftekhar ashtiani
dds, ms assistant professor, department of dental technology, school of dentistry, shahid beheshti university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)

مینو مهشید | minoo mahshid
dds, ms professor, department of prosthodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)

فرهاد طباطباییان | farhad tabatabaian
dds, ms assistant professor, department of prosthodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)

مرضیه علی خاصی | marzieh alikhasi
dds, ms associate professor, department of prosthodontics, school of dentistry, tehran university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

نشانی اینترنتی http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/2692
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/183/article-183-319628.pdf
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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