کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2708637 | 1144912 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: EFFECT OF PILOT HOLE TAPPING ON PULLOUT STRENGTH AND INSERTION TORQUE OF DUAL CORE PEDICLE SCREWS EFFECT OF PILOT HOLE TAPPING ON PULLOUT STRENGTH AND INSERTION TORQUE OF DUAL CORE PEDICLE SCREWS](/preview/png/2708637.png)
ABSTRACTObjective: To evaluate the influence of pilot hole tapping on pullout resistance and insertion torque of pedicle screws with a conical core. Methods: Mechanical tests using a universal testing machine were performed on pedicle screws with a conical core that were inserted into pedicles in the fifth lumbar vertebra of calves. The insertion torque was measured using a torque meter with a capacity of 10 Nm, which was considered to be the highest torque value. The pilot holes were prepared using a probe of external diameter 3.8 mm and tapping of the same dimensions and thread characteristics as the screw. Results: Decreased insertion torque and pullout resistance were observed in the group with prior tapping of the pilot hole. Conclusions: Pilot hole tapping reduced the insertion torque and pullout resistance of pedicle screws with a conical core that had been inserted into the pedicle of the fifth lumbar vertebra of calves.
Journal: Revista Brasileira de Ortopedia (English Edition) - Volume 45, Issue 6, November–December 2010, Pages 565–568