@article { author = {Ghanbarzadeh, Jalil and Rajabzadeh, Mahboobeh and Nakhaei, Mohammadreza and Rajatihaghi, Hamidreza and Tayarani Najjaran, Niloufar}, title = {Torque Removal Evaluation of Screw in One-Piece and Two-Piece Abutments Tightened with a Handheld screwdriver}, journal = {Journal of Dental Materials and Techniques}, volume = {3}, number = {1}, pages = {11-15}, year = {2013}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2013.2051}, abstract = {Introduction: Some clinicians use a handheld screw driver instead of a torque wrench to definitively tighten abutment screws. The aim of this study was to compare the removal torque of one-piece and two-piece abutments tightened with a handheld driver and a torque control ratchet. Methods: 40 ITI implants were placed in acrylic blocks and divided into 4 groups. In groups one and two, 10 ITI one-piece abutments (Solid®) and in groups three and four, 10 ITI two-piece abutments (Synocta®) were placed on the implants. In groups one and three abutments were tightened by 5 experienced males and 5 experienced females using a handheld driver. In groups two and four abutments were tightened using a torque wrench with torque values of 10, 20 and 35 N.cm. Insertion torque and removal torque values of the abutments were measured with a digital torque meter. Results: The insertion torque values (ITVs) of males in both abutments were significantly higher than those of females. ITVs in both Solid® and Synocta® abutments tightened with a handheld screwdriver were similar to the torque of 20 N.cm in the torque wrench. Removal torque values (RTVs) of solid® abutments were higher than those of synocta® abutments. Conclusion: The one- piece abutments (solid®) showed higher RTVs than the two-piece abutments (synocta®). Hand driver does not produce sufficient preload force for the final tightening of the abutment}, keywords = {Hand driver,one-piece abutment,removal torque,torque wrench,two-piece abutment}, url = {https://jdmt.mums.ac.ir/article_2051.html}, eprint = {https://jdmt.mums.ac.ir/article_2051_b406918d4b6d3750ddd14c7de8ab85d0.pdf} }