According to needs, there are light-duty screwdrivers and heavy-duty screwdrivers. They have a flat tip. Although it can be powered or manually operated, the ‘cam-out effect’ of the slotted head makes power operation less common. Tightening a spinning screw can be an arduous task. First, you must find out why you cannot tighten the screw.

Before explaining the different tightening control methods, let’s first cover what it means to tighten in the “elastic region” and the “plastic region” of a screw. However, accuracy relies heavily on the operator being in the correct viewing position. The device is subject to parallax and torque measurement read error (MRE) — again, something accounted for in the ISO 6789 standard in the engineering world, but rarely considered in dentistry. 19 An incorrect viewing position may cause MREs resulting in torque being up to 20% to 30% off the target value. This can cause clinicians to either under-torque or over-torque IA screws. To counter this, the operator must assume a viewing position that is as close to 90 degrees to both the reader arm and cantilever beam as possible (Figures 4A through 4C). FIGURES 4A through 4C. Parallax effect when the viewer’s position changes: In images A through C, the beam has not moved and is set at 32 Ncm (A). The viewing angle has changed by 10 degrees (B) and 30 degrees (C) in the remaining frames. Measurement read error can make it appear as if there is over-torquing when using a cantilever beam wrench. SCREW TIGHTENING TECHNIQUE BS: British standards. British Standard Whitworth (BSW) was the world’s first national screw thread standard established in 1841 but with a few exceptions, is no longer used. If it is overtightened, it will relax and the fixing force will sharply decrease. If the screw is tightened too much beyond this point, it will break and the task, which was almost completed, will fail.Gutierrez J, Nicholls JI, Libman WJ, Butson TJ. Accuracy of the implant torque wrench following time in clinical service. Int J Prosthodont. 1997;10:562–567. However, these specifications are not implemented in other countries like Europe and the United States. During the repair of imported goods, it becomes necessary to follow overseas screw specifications. As a result, the screw cannot be kept straight and is tilted. The screwdriver slot and the screw are unstable, causing damage to the screw slot. When turning, wrist movement causes friction in the slot and damages the screw hole. The surface surrounding the screw hole should now be flatter, giving you a smaller hole into which you can replace your screw.

Threads per inch (TPI): The number of complete threads within one inch of a screw’s threaded length. Hurson S. Use of authentic, integrated dental implant components vital to predictability and successful long-term clinical outcomes. Compend Contin Educ Dent. 2016;37:450–455.The formula for the target tightening force of the tightening operation is also specified in the JIS standards.