How to Choose Implant Drills: Types, Coatings and the Drilling Sequence

The best implant drill is the one that cuts cleanly with little heat, gives you reliable depth control and matches your implant system's drilling protocol. This guide covers the drill types used to prepare an implant site, the features that separate a good drill from a poor one, and how to put together a drill set.

Drill types in an osteotomy sequence

• Round bur: marks the entry point and perforates the cortical bone. Example: the round ball bur 2.0 mm.
• Lance or pilot drill: sets the entry point and the initial direction of the osteotomy. Example: the marking lance pilot drill Ø2.0 mm.
• Twist (shaping) drills: widen the osteotomy in steps up to the final diameter for the implant. Examples: the DNT2 coated twist drills from Ø2.5 to Ø5.0 mm, and the Ø2.5 mm drill with integral stopper in 6 to 13 mm lengths.
• Countersink: widens the coronal part of the osteotomy so the implant platform seats at the planned level. Examples: carbon-coated countersinks for Ø3.75 to 4.2 mm and Ø5 to 6 mm implants.
• Verification instruments: short and long parallel pins check angulation and parallelism, and a probe and spacer checks depth and spacing between implants.
• Drill extender: adds length for posterior sites and limited mouth opening. See the drill extender.

A typical drilling sequence

1. Mark the entry point with a round bur or lance drill.
2. Set the depth and direction with the pilot drill, then check with a parallel pin.
3. Widen step by step with twist drills up to the final diameter.
4. Use the countersink where the protocol calls for it, especially in dense crestal bone.
5. Check depth and direction again before placing the implant.

The final drill diameter depends on the implant diameter and the bone density, so always follow the drilling protocol in the IFU for the implant you are placing.

What makes a good implant drill

Clean cutting and heat control

Bone is sensitive to heat: a classic study found that bone heated to 47 °C for one minute can be damaged (Eriksson and Albrektsson, 1983). Sharp cutting edges, good flute design for removing debris, generous irrigation and an intermittent drilling technique all keep the temperature down. The DNT2 drills, for example, are made for external irrigation.

Coatings

Many implant drills are coated to increase surface hardness and reduce friction, which helps them cut smoothly and hold their edge for longer. Surcam's drills use carbon and multi-layer coatings for this reason.

Depth control

Depth is controlled either by laser markings on the drill or by a stopper. Markings are flexible across implant lengths, and high-contrast markings are easier to read in a bloody field. Integral stoppers physically limit the depth, which adds a margin of safety near the nerve canal or sinus floor.

Material and durability

Drills are usually made from medical-grade stainless steel. They dull with repeated use and sterilization, so check the IFU for the recommended number of uses and replace any drill that cuts less efficiently.

Matching drills to your implant system

Drill diameters, lengths and countersinks must match the implants you place. Many clinicians keep their drills in a system kit so the sequence is always in order; see surgical kits and trays. Browse all implant drills, and the drivers and wrenches used to place the implant.

Implant drill FAQ

What is the best drill for dental implants?

One that matches your implant system's protocol, cuts cleanly with good irrigation, and gives reliable depth control through clear markings or a stopper. Sharpness matters more than brand, so replace drills as they wear.

Why are implant drills coated?

Coatings increase surface hardness and reduce friction, which helps the drill cut smoothly, produce less heat and keep its edge for longer.

What is the drilling sequence for a dental implant?

Usually a round bur or lance drill to mark the site, a pilot drill to set depth and direction, twist drills of increasing diameter up to the final size, and a countersink where needed. The exact sequence comes from the implant's IFU.

How often should implant drills be replaced?

Drills dull with repeated use and sterilization. Follow the recommended number of uses in the IFU, and replace a drill sooner if it cuts less efficiently.

Reference

1. Eriksson AR, Albrektsson T. Temperature threshold levels for heat-induced bone tissue injury: a vital-microscopic study in the rabbit. Journal of Prosthetic Dentistry. 1983;50(1):101 to 107.