Lag Screw, or lag bolts, are a type of screw or fastener used in heavy applications such as construction. These screws are generally thicker and longer than wood screws, allowing them to hold more weight and resist greater forces. They are also known for their ability to penetrate and bind with wood more easily than other types of screws. Additionally, lag bolts typically feature an unthreaded area on the shaft, which allows them to exert more force when tightened.
In this study, 10 cases of fractures of the mandible treated with lag screws were evaluated radiographically and clinically. The results showed that lag screws provide rigid fixation without the need for immobilization in parasymphysis and symphysis fractures, and with minor occlusal discrepancy and mobility in angular and body fractures.
Lag screws come in a variety of lengths and heads, depending on the application. Most lag screws are threaded, but some have no threads and are referred to as “wood lags.” Unlike wood screws and sheet metal screws, which can have different head styles (like slotted, Philips or Torx drive), lag bolts have hex heads that are compatible with a variety of driver types, including nut drivers, ratchets and wrenches. Using the correct driver for your lag bolt will help you achieve maximum strength and speed when installing it. It is important to use a drill bit that is slightly smaller than the diameter of the lag screw to ensure the threads will have enough material to bind to. Lag Screw