Dental Bur Shapes Explained: Which Shape for Which Procedure?

With hundreds of bur shapes available, it's easy to get lost in the catalog. This guide maps the most common shapes to their clinical applications so you can order with confidence.

Pear (ISO 237)

The pear shape (FG 329, 330, 331, 332, 245, 246) is the most commonly used bur shape in general dentistry. Its rounded tip creates smooth cavity floors without sharp internal angles, making it ideal for conservative Class I and II cavity preparations. The FG 330 is the single best-selling dental bur in the United States — and for good reason.

Round (ISO 001–009)

Round burs (FG 1/4 through FG 8 in carbide; 801 series in diamond) are essential for initial caries entry, pulp chamber access, and selective caries removal. Smaller round burs are used in endodontic access, while larger round diamonds (801-023 and up) work well for gross tissue removal.

Straight Fissure (ISO 107–109)

Flat-ended fissure burs (FG 56, 57, 58, 556, 557, 558) produce flat cavity floors and vertical walls. The crosscut versions (556, 557, 558) add horizontal cuts across the flutes for faster material removal — especially useful when cutting through old amalgam restorations.

Round-End Fissure (ISO 137–139)

Round-end fissure burs (FG 1156, 1157, 1158, 1170, 1171) combine the wall-cutting efficiency of a fissure bur with a rounded tip that won't gouge the pulpal floor. Commonly used for crown preparation and bulk reduction where you want to avoid sharp line angles.

Round-End Taper (ISO 198, 199)

The round-end taper (856 series in diamond; 169, 170, 171 in carbide) is the gold standard for full-coverage crown preparation. The tapered shape matches the natural convergence angle for cement retention, while the rounded end prevents pulp exposure at the finish line. The 856-018 is one of the highest-volume diamond burs sold.

Flat-End Taper (ISO 173, 174)

Flat-end tapers (847, 850 series) create shoulder finish lines for all-ceramic crowns. They're preferred over round-end tapers when the restoration design calls for a flat, well-defined margin — particularly for zirconia and lithium disilicate crowns.

Flame (ISO 257, 258)

Flame-shaped burs (862, 878, 881, 882 in diamond; 7901, 7902 in carbide) taper to a fine point, making them ideal for subgingival finishing, interproximal reduction, and accessing tight areas. Fine-grit flame diamonds are commonly used for soft tissue recontouring.

Needle (ISO 165, 166)

Needle burs (806, 830, 859 series) have an extremely narrow, pointed profile. They're used for fine detail work: precise interproximal slots, thin finish lines, occlusal anatomy refinement, and accessing furcation areas.

Football / Egg (ISO 277)

Football-shaped burs (379 series) are ovoid and blunt, making them well-suited for occlusal adjustment, smoothing bone margins during surgery, and finishing composite in concave surfaces. The 379-023 in coarse grit is a common choice for occlusal equilibration.

Wheel (ISO 303, 304)

Wheel or disc burs (368, 369 series) are flat and wide. They're used for creating slots, separating contacts, and bulk occlusal reduction. A coarse 368-023 diamond wheel cuts quickly through enamel for interproximal access.

Inverted Cone (ISO 010, 011)

Inverted cone burs (FG 33½, 34, 35, 36, 37 in carbide; 807 series in diamond) are wider at the head than the shank. They create undercuts for mechanical retention in cavity preparations — a classic technique for amalgam restorations and some composite preps.

Quick Reference

Shape	Common Numbers	Primary Uses
Pear	330, 245, 329	Cavity prep, caries access
Round	FG 1–8, 801 series	Caries removal, endo access
Straight Fissure	557, 558, 556	Flat floors, amalgam removal
Round-End Taper	856, 169–171	Crown prep (all types)
Flat-End Taper	847, 850	Shoulder margins, ceramic crowns
Flame	862, 878, 881	Subgingival finishing, soft tissue
Needle	806, 830, 859	Fine detail, IPR, furcations
Football	379	Occlusal adjustment, bone smoothing
Wheel	368, 369	Slots, contact separation
Inverted Cone	33½–37, 807	Undercuts, retention

All of these shapes are available at Koyo Dental in carbide, diamond, or both — with factory-direct pricing and same-day shipping from Irvine, CA. Shop Carbide Burs →  |  Shop Diamond Burs →