Understanding cutting geometry and rotational speed: what determines cutting quality

Why does one instrument cut smoothly and cleanly while another vibrates and catches? The answer lies in the cutting geometry, grit and rotational speed.

Cutting or grinding

Carbide instruments cut with defined blades, while diamond instruments grind with bonded diamond grains. Both principles have their place: cutting for metal, plastic and preparation; grinding for enamel, ceramic and hard materials.

Cutting geometry determines behaviour

With carbide, the cutting geometry is decisive:

• coarse-cut: rapid material removal, for preparation and surgery
• cross-cut: smooth running, short chips, no catching
• fine-cut (finishers): smooth surface as a preliminary stage to polishing

Grit of diamond instruments

With diamonds, the colour code indicates the grit, from coarse (rapid material removal) to extra-fine (finishing). A graduated approach from coarse to fine delivers a natural surface result.

The right rotational speed

Every shank and every application has a recommended rotational speed range. Too high a speed generates heat and wear, while too low a speed reduces efficiency. Working with irrigation and cooling, together with light pressure, protects both the instrument and the substance.

The interplay is what counts

Only the right combination of geometry, grit and rotational speed produces a clean, efficient cut. Those who understand these relationships make more targeted choices and work more smoothly.

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From our range

The toothing determines the cutting behaviour, and that is exactly why we offer a broad carbide range. For the clinic there are finely toothed finishers for smoothing and coarse cutting burs for preparation, for surgery cross-cut instruments that run smoothly, for the lab carbide cutters in various toothings. All instruments are Swiss Made to ISO 13485, in stock and ready to ship within 48 hours.

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That makes finding the right instrument fast: our shop can be filtered and grouped by material and application as well as many further specifications (shank, size, grit, toothing, pack size).