ProxiBur™ Interproximal Reduction Bur Refills

ProxiBurs™ – Rotary IPR Without the Guesswork

ProxiBurs™ are purpose-built interproximal reduction (IPR) reusable diamond burs engineered to bring consistency, efficiency, and control to enamel reduction. Designed specifically for interproximal reduction, ProxiBurs™ enable clinicians to perform predictable, repeatable IPR as part of a modern, standardized workflow when combined with FitStrips™. To maximize ProxiBurs™ useful life (4-6 uses), use ample waterflow with burs to reduce friction / heat generation.

Key Benefits: 

Predictable Reduction 
Engineered shapes and calibrated thicknesses support controlled enamel removal, improving procedural accuracy and repeatability. 

Enhanced Efficiency 
Clinicians report meaningful time savings during procedures, enabling faster case completion without compromising control. 

Smooth Cutting Performance 
Designed for consistent cutting feel and improved handling in tight interproximal spaces. 

Three Shapes: 

PRXR01: 

This shape maintains a constant thickness across its diameter, enabling consistent enamel reduction. It is engineered for anterior IPR and recontouring, with a cone-shaped tip designed to refine tooth contours following interproximal reduction with the tip. 

PRXR01S 

• Thickness of Reduction: 0.30mm
• Head Length: 5mm
• Total Length: 20mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR01M 

• Thickness of Reduction: 0.40mm
• Head Length: 5mm
• Total Length: 20mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR02: 

This shape features a tapered thickness across its diameter for controlled, progressive enamel reduction. As you move along its diameter further from the handpiece, the bur becomes thinner. Positioned between PRXR01 and PRXR03, it offers a balanced abrasive profile, making it ideal for IPR in the 0.2mm to 0.5mm range. 

PRXR02S 

• Thickness of Reduction: 0.20-0.45mm
• Head Length: 3.4mm
• Total Length: 22mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR02M 

• Thickness of Reduction: 0.30-0.50mm
• Head Length: 3.4mm
• Total Length: 22mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR03: 

Like PRXR02, this shape features a tapered thickness across its diameter, with a longer abrasive portion for extended working length compared to PRXR02. It is optimized for gingival-to-occlusal (vertical) IPR and represents the thickest option among the three ProxiBur™ IPR shapes. 

PRXR03S 

• Thickness of Reduction: 0.20-0.55mm
• Head Length: 7mm
• Total Length: 23.5mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR03M 

• Thickness of Reduction: 0.30-0.65mm
• Head Length: 7mm
• Total Length: 23.5mm
• Recommended Max RPM: 450,000
• Shank: FG 

PRXR04F: 

This ProxiBur™ is designed for general finishing and contouring following IPR, delivering smooth, refined enamel surfaces. It can be used as a standalone finishing solution or in place of FitStrips™ when needed. This bur is not designed for IPR. 

A Complete IPR System 

ProxiBurs™ are designed to work seamlessly with finishing strips in a two-step IPR process: 

1. Gross Reduction: 
   Use ProxiBurs™ for efficient enamel removal (≥ 0.30 mm) 
2. Controlled Enamel Reduction & Finishing: 
   Follow with FitStrips™ for precise, controlled IPR (< 0.30 mm) and for finishing following ProxiBur™ use. 

This integrated approach creates a comprehensive solution that improves both clinical outcomes and workflow consistency. 

Frequently Asked Questions

Q: Why would I buy ProxiBurs if I already have FitStrips?
A: Burs: faster, more efficient, will save you time during IPR​ Strips: more controlled, ideal for finishing post ProxiBur use or for small IPR (<0.3mm) requirements.

Q: Are burs or strips more accurate?
A: Studies show diamond burs are more accurate than strips for achieving planned IPR amounts, with smaller deviations from target reduction.

Q: Why do clinicians often underperform planned IPR?
A: Research shows clinicians tend to be more conservative to avoid over-reduction. They also tend to remove less enamel than planned, especially with strips.

Q: Could I use ProxiBurs for something other than IPR?
A: ProxiBurs are designed specifically for IPR rather than repurposed general diamond burs. That said, some clinicians have indicated that ProxiBurs work well for composite veneer / injection molding cases.

Q: How are ProxiBurs different from standard diamond burs I own?
A: ProxiBurs have calibrated working thicknesses for measurable IPR. They are designed specifically for enamel slenderization and have improved control compared to general purpose diamond burs.

Q: When should I use ProxiBurs over FitStrips for IPR?
A: When planned reduction is >= 0.30mm and you want efficient, predictable, accurate, gross enamel reduction.

Q: When should I use FitStrips over ProxiBurs for IPR?
A: When planned reduction is <= 0.30mm and for finishing / smoothing after >= 0.3mm IPR with ProxiBurs.

Q: Are ProxiBurs difficult to learn?
A: No. IPR ProxiBurs integrate into existing workflows and are intuitive for clinicians who are already performing IPR, especially those familiar with high-speed handpieces.

Q: Is there a recommended motion technique (e.g., occlusogingival vs. buccolingual strokes) to avoid creating enamel ledges, given that ledging is an intrinsic risk in mechanical IPR?
A: Make sure to perform IPR parallel to the long axis of the tooth and to perform gentle occlusogingival stroke motions. If there is severe crowding and you try and perform the requested IPR in one motion / stroke, it is easy to build friction and create ledges.

Q: For tapered burs (PRXR02 and PRXR03) with decreasing thickness towards the tip (e.g., 0.20–0.45 mm or 0.20–0.55 mm), how can the clinician accurately control the exact thickness inserted into the interproximal space? How do we prevent over-reduction if the bur penetrates further vertically?
A: The function of the tapered thicknesses is so that you can use the thinner portions to open up the contact and begin to perform IPR.  If you use the stroke motion and move towards the base (e.g. thicker portion of the bur), you will get the desired IPR and can check with the gauge. An alternative method (let's say you need 0.55mm), is to use the 0.55mm ProxiBur, get it as close as possible to 0.55mm of IPR, and then use a FitStrip to get you to the finish line.

Q: In which specific clinical scenarios is it preferable to use constant-thickness parallel burs (PRXR01S/M) over tapered burs in the anterior region?
A: Clinician preference. Anything in the 0.3 / 0.4mm range, the PRXR01S/M is likely easier to use than the PRXR02 and PRXR03. That said, we've had multiple dentists indicate that they like the occlusogingival IPR (e.g. PRXR02 and PRXR03 burs) better.

Q: How should clinicians objectively evaluate diamond wear to discard the bur before friction causes excessive heat?
A: When it requires noticeably more pressure to cut effectively. The diamond abrasive should make it easy to perform IPR. When it becomes more difficult, it is time to replace the bur.

Q: In cases of severe crowding where contact points are non-parallel, should clinicians always break the contact first using a serrated saw or yellow FitStrip before introducing a ProxiBur, or can the fine tip of the PRXR02S or PRXR03S enter directly without creating notches?
A: While we'd recommend opening the contact with the serrated saw and yellow FitStrip, the design function of the tapered thickness of PRXR02 and PRXR03 is to open the contact with the thin tip, so it's ultimately your choice.