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The Spider Screw for Skeletal Anchorage
B. GIULIANO MAINO, MD, DDS JOHN BEDNAR, DMD PAOLO PAGIN, DDS PAOLA MURA, DMD
O rthodontic movements such as anterior retraction and intrusion of overerupted teeth are difficult to achieve without undesirable reci- procal movements of the anchorage units.1-3 Titanium miniscrews not only provide non- dental anchorage, but they are inexpensive, small, simple to place, immediately loadable, and well tolerated by patients.4-9
This article describes a new titanium mini- screw and shows several of its clinical applica- tions.
slot, an external slot of the same dimensions, and an .025" round vertical slot. It comes in three heights to fit soft tissues of different thicknesses: regula , with a thicker head and an intermediate- length collar; low profile, with a thinner head and a longer collar; and low profile flat, with the same thin head and a shorter collar (Fig. 2).
All three types are small enough to avoid soft-tissue irritation, but wide enough for ortho- dontic loading. The biocompatibility of titanium ensures patient tolerance, and the Spider Screw’s
The Spider Screw
The Spider Screw* (Fig. 1) is a self-tapping miniscrew available in three lengths—7mm, 9mm, and 11mm—in single-use, sterile packag- ing. The screw head has an internal .021" .025"
*Trademark of HDC Company, Via dell’Industria 11, 36016 Sarcedo, Italy; e-mail: firstname.lastname@example.org.
EXTERNAL RECT. SLOT
Fig. 2 Different heights of Spider Screw. A. Reg- ular. B. Low profile. C. Low profile flat.
INTERNAL RECT. SLOT
INT. ROUND SLOT
Fig. 1 Spider Screw.
Fig. 3 Acrylic surgical index with orthodontic wire extending to point of screw insertion.
© 2003 JCO, Inc.