Halo Sectional Matrix Wedge: Placement Tips for Tight Contacts
By Ultradent Products, Inc. | Published: 2026-10-31
Category: How-to Guides
Learn how to place Halo sectional matrix wedges for tight Class II contacts, from wedge selection to active wedging and checking the seal.
Quick answer
Place a Halo sectional matrix wedge by selecting a size that fits the embrasure, inserting it from the widest access, and seating it with active pressure until the band seals against the adjacent tooth. Check the contact and seal before curing.
Why wedge selection matters more than insertion force
A wedge that is too small will not create enough separation or seal the band, while one that is too large can distort the matrix or be painful for the patient. Halo wedges are color-coded and stackable, so you can match the wedge to the embrasure and add a second wedge when the space is wider than a single wedge can manage.
Anatomical wedge placement depends on the shape of the embrasure, not just its width. A wedge that follows the gingival contour will hold the band in place better than a round wedge forced into a triangular space.
When active wedging is the right choice
Active wedging means the wedge is placed under pressure so it pushes the matrix band against the adjacent tooth. This is useful for tight contacts in Class II preparations, but it is not always necessary. If the contact is already tight and the band seals without extra pressure, a passive wedge may be enough.
Use active wedging when the contact is open or the band does not adapt well. Avoid excessive force, which can bend the band or make removal difficult.
Step-by-step wedge placement
- Assess the embrasure and choose a wedge size: Look at the embrasure from the buccal and lingual sides. Pick the smallest Halo wedge that will contact both the band and the adjacent tooth. If the space is wider than one wedge covers, plan to stack a second wedge. A wedge that drops in without touching the band is too small.
- Insert from the widest access: Place the wedge from the side with the clearest path, usually the buccal or lingual embrasure. Guide it gently until the tip passes the contact point and the body sits against the band. Forcing a wedge from a tight side can tear the band or injure the papilla.
- Seat with active pressure: Push the wedge apically until you feel resistance and see the band adapt to the adjacent tooth. Stop when the band is sealed; do not keep pushing after the contact is closed. If the band does not seal, try the next size up before applying more force.
- Stack a second wedge if needed: In wide embrasures, place a second Halo wedge alongside the first, using the same active pressure. Stacking helps fill the space and maintain separation. Check that the second wedge does not lift the first one out of position.
- Verify the seal and contact before curing: Look for gaps between the band and the adjacent tooth. If you see a gap, reseat or change the wedge. Confirm the contact is tight with floss or a contact gauge before placing restorative material. A wedge that feels tight can still leave a gap; always check visually.
Product facts
- Halo™ Sectional Matrix Wedge: Halo sectional matrix wedges are designed for active wedging and anatomical adaptation, and they are stackable and color-coded. Color coding speeds up size selection, and stacking lets you build width in larger embrasures without switching to a different wedge type.
Halo™ Sectional Matrix Wedge
