Interproximal reduction (IPR) is a well-established orthodontic procedure for gaining space without extraction, especially in cases of mild to moderate crowding, Bolton discrepancy correction, contact point reshaping, and black triangle management. Recent research described it as most appropriate in carefully selected cases with about 4–8 mm of crowding, while also emphasizing that it is irreversible and therefore highly technique-sensitive.
Instead, the evidence suggests a more nuanced conclusion: IPR can be biologically safe and orthodontically effective when case selection, enamel limits, finishing, and instrument choice are controlled properly. Long-term studies by researcher found no meaningful increase in caries, periodontal damage, or thermal sensitivity when enamel reduction was carried out carefully and followed by proper finishing.
That last point is critical. In daily practice, the question is not only whether to perform IPR, but how to perform it. The literature consistently shows that the type of instrument used influences enamel roughness, precision of enamel removal, plaque-retentive surface changes, and how accurately the clinician achieves the amount of space planned in the orthodontic setup.
What the research says about IPR safety
One of the most important concerns in IPR research is whether reducing proximal enamel increases long-term risks such as caries, sensitivity, or periodontal deterioration. The strongest long-term clinical evidence comes from Zachrisson’s work. In the 2007 AJODO study, teeth that underwent interproximal enamel reduction and were reviewed more than 10 years later were reported to be no more susceptible to caries or periodontal disease than unaltered surfaces.
That conclusion was reinforced in a later posterior-teeth study, where the same research group reported that interdental enamel reduction with their protocol did not result in increased caries risk, and none of the 43 patients reported increased sensitivity to temperature variation.
At the review level, the 2021 systematic review on IPR techniques and the newer periodontal-focused review both point in the same direction: short-term surface alterations do occur, but the available evidence does not show a consistent rise in clinically relevant caries, periodontal deterioration, or long-term sensitivity when the procedure is performed conservatively and finished appropriately. Both reviews also emphasize the importance of polishing and fluoride application in obtaining better biological outcomes.
So the modern evidence-based view is not that IPR is risk-free, but that the main risks are operator- and technique-dependent rather than unavoidable.
Enamel surface roughness
The most consistent laboratory and translational finding in IPR research is that instrumentation changes enamel topography. This matters because rougher proximal enamel is more plaque-retentive and may be harder for patients to clean, especially during orthodontic treatment. The 2020 microscopic study comparing hand-held strips and air-rotor stripping found that air-rotor burs created significantly more surface roughness than mechanical strip-based reduction, and that polishing markedly reduced roughness afterward.
That study is clinically useful because it links three ideas that orthodontists deal with every day:
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Different IPR instruments do not create the same enamel surface.
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Rougher surfaces are less desirable biologically.
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A polishing/finishing phase is not optional if the goal is a more enamel-friendly result.
The literature summarized in recent reviews reaches a similar conclusion: manual or oscillating strip-based systems generally produce smoother surfaces than more aggressive bur/disc-only techniques, and finishing/polishing improves the final surface condition.
From a clinical standpoint, this is where instrument selection starts affecting overall orthodontic outcome. A rough or poorly finished proximal surface may not immediately derail alignment, but it can compromise oral hygiene, increase plaque retention during active treatment, and undermine the biological quality of the result.
Accuracy of enamel removal
Another major line of research focuses on whether clinicians actually remove the amount of enamel they intended to remove. This matters because orthodontic planning often depends on very small quantities of space. If the achieved IPR differs from the planned IPR, then staging, contact relationships, tooth movement, and refinement burden can all be affected.
In a 2020 study on clear aligner cases, De Felice and colleagues found that the amount of enamel removed did not correspond closely to the amount planned, with reported accuracy of only 44.95% in the upper arch and 37.02% in the lower arch. In most cases, the performed amount was lower than planned.
type of system affects this accuracy. A 2024 in vivo study comparing three IPR approaches reported that the two motor-driven methods were more accurate overall than the hand-operated system, while the hand-operated abrasive strip system tended to underperform relative to the planned amount, especially in certain teeth such as maxillary central incisors and mandibular canines.
More recent evidence suggests that the Clinically, this has direct implications. If the clinician under-reduces enamel, the arch may remain crowded, aligners may not track as intended, or finishing stages may increase. If the clinician over-reduces, the error is irreversible. So the ideal IPR system is not simply the fastest one; it is the one that allows controlled, measurable, reproducible reduction, followed by careful finishing.
Overview of how instrument choice can influence The orthodontic outcome
The orthodontic outcome is not determined by IPR alone, but IPR can influence several important endpoints:
1. Space management and treatment predictability
If the instrument cannot consistently deliver the planned enamel reduction, the discrepancy between digital setup and clinical execution grows. That can reduce predictability, especially in aligner cases where space creation must closely match programmed movement. Evidence from in vivo accuracy studies shows that execution errors are common, and that instrument/system design affects how close clinicians get to the intended amount.
2. Enamel preservation
Some instruments are more aggressive and may generate deeper grooves or rougher proximal surfaces. The evidence from microscopic roughness studies suggests that smoother post-IPR surfaces are more likely when less aggressive reduction is paired with polishing and strip-based finishing.
3. Periodontal and hygiene outcomes
Review-level evidence indicates that periodontal indices such as bleeding on probing and clinical attachment loss are generally not significantly worsened when IPR is done properly. But rougher surfaces remain a concern because they can favor bacterial adhesion and plaque accumulation. That means the instrument affects not only chairside convenience, but also the biologic cleanliness of the final surface.
4. Treatment efficiency
A system that removes enamel quickly but imprecisely may save time in a single appointment while increasing the need for later refinements. Conversely, a system that combines efficient reduction with controlled finishing may support smoother progression through the treatment plan. This is an inference from the accuracy and roughness data rather than a direct head-to-head trial on total treatment duration, but it is a reasonable clinical interpretation of the evidence.
Mr. Bur IPR Kit and Mr. Bur IPR Strip System 1.0 clinical design
When viewed through the lens of the literature, the most defensible clinical workflow is a two-phase approach:
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a controlled reduction phase for efficient space creation
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a refinement/finishing phase to improve surface quality and contour
That is the logic behind combining a rotary/mechanical reduction system such as the Mr. Bur IPR Kit with a finishing-oriented system such as the Mr. Bur IPR Strip System 1.0.
Mr. Bur IPR Kit: The One slice precise reduction
The clinical role of IPR bur or mechanically driven IPR kit is to create the required space efficiently, especially when multiple contacts must be reduced. The literature supports the value of motor-driven systems for better achievement of planned reduction compared with less efficient hand-operated approaches in some settings.
From an evidence-based standpoint, the advantage of using the Mr. Bur IPR Kit is not merely speed. Its real value is in enabling the operator to perform structured, measurable enamel reduction during the first phase of treatment without the need of gauges.
Mr. Bur IPR Strip System 1.0 : From finishing to contouring
The strip phase becomes especially important once we consider the roughness literature. Since bur-based and air-rotor systems can create rougher enamel if used alone, a strip system is clinically relevant for smoothing, refining contact morphology, and reducing surface irregularities after the main reduction phase.
So, in a research-based workflow, the Mr. Bur IPR Strip System 1.0 is not just an accessory. It addresses one of the most important issues identified in the IPR literature: the need to leave behind a cleaner, smoother, better-finished proximal enamel surface.
Research Summary
The strongest message from the IPR literature is that instrument selection changes the quality of the result. The clinician is not simply creating space. The clinician is also shaping the surface that remains after treatment.
A poorly chosen or poorly controlled instrument can contribute to:
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inaccurate space creation
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excess roughness
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more plaque-retentive proximal surfaces
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greater need for finishing or refinement
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mismatch between digital plan and actual outcome
A well-designed workflow, by contrast, supports:
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more predictable space creation
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smoother enamel after finishing
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better hygiene compatibility
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more stable contact morphology
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greater alignment between treatment planning and clinical execution
That is why the combination of Mr. Bur IPR Kit and Mr. Bur IPR Strip System 1.0 can be presented clinically as a precision-plus-finishing protocol rather than a product-first pitch. The evidence supports the principle behind that workflow: reduce accurately, then refine thoroughly.
Conclusion
The research on interproximal reduction no longer supports broad fear of the technique itself. Long-term clinical studies suggest that properly performed IPR does not inherently increase caries, periodontal disease, or sensitivity, while laboratory and in vivo studies show that outcomes are strongly shaped by the instrument used, the accuracy of reduction, and the finishing protocol.
In other words, the orthodontic success of IPR is not just about removing enamel. It is about removing the right amount, with the right level of control, and leaving behind the right surface quality.
From that perspective, using the Mr. Bur IPR Kit for controlled space creation and the Mr. Bur IPR Strip System 1.0 for refinement and finishing is consistent with the direction of current IPR research. It supports both the mechanical goals of orthodontics and the biologic responsibility of preserving enamel quality.
Research references
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Zachrisson BU, Nyøygaard L, Mobarak K. Dental health assessed more than 10 years after interproximal enamel reduction of mandibular anterior teeth. Am J Orthod Dentofacial Orthop. 2007.
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Zachrisson BU, Mjör IA, et al. Dental health assessed after interproximal enamel reduction: caries risk in posterior teeth. Am J Orthod Dentofacial Orthop. 2011.
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Koretsi V, Chatzigianni A, Sidiropoulou S. Enamel roughness and incidence of caries after interproximal enamel reduction: a systematic review. Orthod Craniofac Res. 2014.
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Gómez-Aguirre JN, et al. Effects of interproximal enamel reduction techniques used in orthodontics: a systematic review. Orthod Craniofac Res. 2021/2022.
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Harish S, Karunakara BC, Reddy S. Comparison of Interproximal Reduction Techniques and Proximal Strips: An Atomic Force Microscopic and Confocal Microscopic Study. 2020.
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Nucci L, et al. Enamel interproximal reduction and periodontal health. 2024.
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De Felice ME, et al. Accuracy of interproximal enamel reduction during clear aligner treatment. 2020.
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Güleç-Ergün P, et al. Comparison of the accuracy of three interproximal reduction methods. 2024.
