The spider screw for skeletal anchorage.

JCO/FEBRUARY 2003 O movements such as anterior retraction and intrusion of overerupted teeth are difficult to achieve without undesirable reciprocal movements of the anchorage units.1-3 Titanium miniscrews not only provide nondental anchorage, but they are inexpensive, small, simple to place, immediately loadable, and well tolerated by patients.4-9 This article describes a new titanium miniscrew and shows several of its clinical applications.