You’ve planned 0.30 mm of interproximal reduction (IPR) between two incisors. The gauge slips through near the biting edge, then catches closer to the gumline. The upper part of the contact already has the space you need. Which instrument will let you refine the tighter area without widening the opening above it?
The answer depends on the contact in front of you. A loose diamond strip can follow the curve of a crowded incisor. A single-sided disc can help reshape an exposed proximal surface. When several contacts are accessible, a reciprocating handpiece can help you work through them in sequence. This guide compares five IPR techniques for clear aligners and braces, with MR.BUR and Kaneiko instrument options and chairside checks for each approach.
Choosing an IPR instrument at the chair
| Method | When it fits | What to check at the chair |
|---|---|---|
| Loose manual diamond strip | A tight or offset contact where the strip needs to follow the curve of an incisor or canine. Choose a single-sided strip for work directed at one tooth or a double-sided strip when both surfaces need reduction. | Check that the strip follows the intended proximal surface. In a crowded segment, a diagonal pass can abrade the corners of both teeth. Verify the space with an independent gauge because strip thickness and achieved space are different measurements. |
| Handheld strip holder or opener | Initial contact opening when a short mounted insert gives you a supported manual grip. It fits best when the contact is visible and the holder can line up with the intended surface. | Confirm the insert is securely seated and the frame clears the neighboring tooth, bracket, or wire. Gauge the space before choosing a thicker strip or switching to a powered instrument. If the frame forces an awkward angle, reassess access. |
| Diamond disc | Selective reshaping when an offset tooth leaves one proximal surface exposed, such as a triangular lateral incisor. Choose a single-sided disc for work on one surface, or consider a double-sided disc when both surfaces are planned for reduction and access allows. | Confirm which face is abrasive, keep the disc path and surrounding soft tissues in view, and follow the instrument’s instructions for guarding, speed, and cooling. Inspect the surface for a flat facet or sharp transition that needs finishing. |
| Rotary IPR bur | Rapid initial space creation at a well-aligned contact with a visible, controlled approach. Select the bur profile and working length for the tooth and site. | Check the gauge near the biting edge and farther toward the gumline. If a 0.30 mm gauge passes incisally but catches cervically, locate the tight area before refining it. Inspect the transition into the natural enamel for a ledge. |
| 4:1 reciprocating handpiece with IPR strips | Progressive reduction across several accessible contacts. When multiple sites need the same strip grade, you can work across those sites before changing inserts. | Verify that the strip is compatible and securely seated, and that the mounted frame can reach the intended surface. Gauge each contact separately before progressing. If crowding or an appliance blocks the approach, consider a loose strip or reassess the timing of the remaining reduction. |
1. Loose diamond strips for tight or offset contacts
When one lower incisor sits slightly lingual to its neighbor, a loose strip tends to take the easiest path through the crowding. That path can run diagonally across the corners of both teeth. Before starting, identify the proximal surface that will form the contact after alignment. A flexible strip lets you follow that surface more closely.
A useful chairside check is to compare the strip thickness with the space measured independently. Even if two 0.10 mm strips pass together, a 0.20 mm gauge may still catch. The teeth can separate slightly under pressure while the strips pass through. Check the gap with light pressure before deciding whether more reduction is needed.
MR.BUR’s single-sided serrated strips come in 0.08, 0.10, and 0.13 mm. The double-sided versions come in 0.10, 0.12, and 0.16 mm. Choose a strip based on the available access and the surface you intend to work on. MR.BUR Single-Sided Diamond Strips with Serrated Edge · MR.BUR Double-Sided Diamond Strips with Serrated Edge.
2. Diamond discs for selective reshaping
A diamond disc can be useful when an offset tooth leaves one proximal surface exposed and the treatment plan calls for reshaping it. On a triangular incisor, selective reshaping can change the length or position of the contact. If the goal includes reducing a visible black triangle, assess the papilla and periodontal support alongside tooth shape.
Consider a contact planned for 0.30 mm of reduction. If the plan allocates 0.20 mm to the wider lateral incisor and 0.10 mm to the narrower central incisor, a gap gauge can show the total space at the contact. To check the change on the lateral incisor itself, you can measure its width with a digital caliper. For example, readings of 6.51 mm before and 6.31 mm after, taken using the same landmarks, show a 0.20 mm change in that tooth’s measured width.
A disc can leave a broad, flat facet even when the space is correct. Inspect how the prepared area blends into the natural tooth surface and refine any sharp transitions. Confirm the compatible low-speed mandrel and handpiece before use. MR.BUR Flexi Diamond Disc Single-Sided · MR.BUR Ultra Flexi Diamond Disc Double-Sided.
3. A handheld strip holder for initial contact opening
A handheld holder gives you a fixed grip on a short insert for controlled manual passes. It is useful when you can aim the insert directly at the contact. Where a rotated tooth, bracket, or wire crowds the approach, a loose strip may have more room to follow the tooth’s contour.
Check how much space is available after opening the contact. If a 0.15 mm gauge fits and a 0.20 mm gauge catches, use those readings alongside the treatment plan to decide whether to refine the contact now or complete the remaining reduction at a later stage. Every MR.BUR IPR Stripping System purchase includes a complimentary handheld strip holder.
4. Rotary IPR burs for well-aligned contacts
A narrow rotary bur can create initial space quickly when the contact is aligned and the approach is visible. Choose the working length and profile for the site. A tapered bur can leave a wider opening near the biting edge than toward the gumline, so gauge fit at the entrance gives only part of the picture.
Return to the opening example. If the 0.30 mm gauge passes incisally and the contact is closer to 0.20 mm cervically, locate where the gauge binds before refining the preparation. Also check for a ledge, a small step where the prepared surface meets the natural enamel. A finishing instrument can help smooth the transition while preserving the proximal contour. Follow the bur and handpiece instructions for speed and irrigation.
The MR.BUR One Slice IPR Kit 2.0 includes 23 friction-grip diamond burs for a compatible high-speed handpiece, with anterior and posterior working lengths and a superfine finishing option. Explore the MR.BUR One Slice IPR Kit 2.0.
5. Reciprocating strips for multiple accessible contacts
The Kaneiko Model IPR 4:1 Reciprocating Contra Angle converts input from a compatible E-type motor into back-and-forth movement of the mounted strip. Paired with MR.BUR IPR Strip System 1.0, it gives you four double-sided grades for progressive reduction.
| Strip color | Nominal thickness | Abrasive grit |
|---|---|---|
| Yellow | 0.10 mm | 15 μm, super fine |
| Red | 0.20 mm | 30 μm, fine |
| Blue | 0.30 mm | 46 μm, medium |
| Green | 0.40 mm | 90 μm, coarse |
Thickness in millimeters describes the strip. Grit in microns describes the abrasive. Choose the starting grade based on available space, then verify the gap with a gauge before progressing.
Access can vary even within the same case. At a crowded canine–premolar contact, for example, the mounted strip may reach only part of the intended surface. If the frame limits the approach, assess whether a loose strip can reach the site or whether the remaining reduction should be staged until access improves. MR.BUR IPR Strips with the Kaneiko 4:1 Reciprocating Handpiece.
What the research says about planned and achieved IPR
In an analysis of Invisalign cases from 10 orthodontic practices, the amount of IPR achieved averaged 44% of the prescribed amount per tooth in the study sample, with a mean shortfall of 0.16 mm. In a separate prospective observational study of 50 aligner patients, the mean difference between planned and achieved IPR was 0.15 mm. Gauge use was associated with a smaller discrepancy.
At the chair, account for any space already present. If a contact admits a 0.05 mm gauge before IPR and a 0.20 mm gauge afterward under comparable conditions, the measured gap increased by 0.15 mm. Check the accessible depth of the contact, inspect the proximal contour, and recheck the space after finishing. Record which contact you treated, what the gauge showed, and how much reduction remains planned so you know where to pick up at the next visit.
Diamond Burs, Carbide Burs, Surgical & Lab Use Burs, Endodontic burs, IPR Kit, Crown Cutting Kit, Gingivectomy Kit, Root Planning Kit, Orthodontic Kit, Composite Polishers, High Speed Burs, Low Speed Burs
