InterGuard Interproximal Tooth Guard: When and How to Use It

Quick answer

Use InterGuard interproximal tooth guard whenever a preparation or finishing step puts an adjacent tooth at risk—especially during Class II, Class III, or Class IV restorations. Place it before cutting or finishing, confirm it sits flat against the adjacent proximal surface, and remove it before final cure or polishing.

Why adjacent teeth need protection during restorations

Iatrogenic damage to the adjacent tooth is one of the most common—and most preventable—complications in direct restorative dentistry. The proximal surface you are not treating is often just millimeters from the bur, matrix band, or finishing instrument. Once enamel is nicked or a contact is altered, the patient may need a second restoration or experience sensitivity that is difficult to trace back to the original procedure.

InterGuard interproximal tooth guard is designed to sit between the tooth you are treating and the neighboring tooth, creating a physical barrier during preparation and finishing. It is not a matrix and it does not replace isolation; it is a protective insert used at the steps where your instruments come closest to the adjacent proximal surface. Knowing when that risk is highest helps you decide when the guard earns its place in the sequence.

When InterGuard makes the most difference

The highest-risk moments are not always the obvious ones. Any time a bur, finishing strip, or matrix ring is working near an adjacent proximal surface, there is a chance of unintended contact. InterGuard is most useful when the preparation margin is close to the adjacent tooth, when you are refining a proximal box, or when you are finishing a contact and want a clear barrier between the treated site and the neighbor.

It is also useful in cases where the adjacent tooth already has a restoration, a veneer, or thin enamel. In those situations, even minor instrumentation damage can compromise existing work. If the adjacent tooth is already compromised or the patient reports sensitivity there, protect it before you begin rather than after you notice a problem.

What to check before you place InterGuard

Before placing the guard, confirm the proximal contact is clear of debris and that the adjacent tooth is stable. A quick visual and tactile check with a probe helps you understand the contour you are protecting. If the adjacent tooth is mobile or has a defective margin, stabilize or address that first—the guard is a barrier, not a splint.

Also confirm your isolation field is dry and retracted enough that you can see the proximal surface. If you cannot see the contact clearly, you cannot verify that the guard is seated correctly. In that case, improve isolation before continuing.

InterGuard placement steps

1. Assess the adjacent tooth before you cut: Look at the neighboring proximal surface and note any existing restoration, enamel defect, or sensitivity. Decide whether the guard is needed before you pick up the handpiece, not after you have already started preparing. Checkpoint: if the adjacent tooth is already compromised, protect it first.
2. Seat InterGuard flat against the adjacent proximal surface: Insert the guard so it sits flush against the tooth you are protecting, with no gap or fold that could catch a bur. Confirm it stays in place when you release pressure. Common mistake: placing it at an angle so only part of the proximal surface is covered.
3. Verify visibility and stability before continuing: Look at the guard from the occlusal and buccal angles. If you cannot see the edge of the guard or it shifts when you touch it, reposition it or improve isolation. Checkpoint: a guard you cannot see is a guard you cannot trust.
4. Prepare and finish with the guard in place: Keep the guard seated while you refine the proximal box, finish margins, or polish. Avoid pulling it out mid-step to check the contact—remove it only when you are finished with the instruments that put the adjacent tooth at risk. Common mistake: removing the guard too early to inspect the contact, then continuing to instrument.
5. Remove the guard and inspect the adjacent tooth: After the risky steps are complete, remove InterGuard and visually check the adjacent proximal surface. Confirm there is no scratch, gouge, or altered contact before you move to final restoration steps. Next step: if you see damage, address it before the patient leaves rather than at a follow-up.

Product facts

• InterGuard™-Interproximal Tooth Guard: InterGuard interproximal tooth guard is designed to reduce the risk of iatrogenic damage to adjacent teeth. It gives you a physical barrier at the steps where burs and finishing instruments come closest to the neighboring tooth.