Wear-Proof Implant Drills: Myth or Truth?

Written and clinically reviewed by Dr. Zvi Fudim, DDS, dental surgeon and founder of Crown Down Inc.Clinically reviewed: June 2026

Introduction

It is no secret that dull implant drills are among the most annoying events an implant dentist can encounter. Even when the manufacturer’s recommendations are followed, no one can guarantee that hard-bone cases will not challenge a surgical kit from time to time. Most implant drills are made of stainless steel, which is not the hardest metal for such an abrasive material as bone. Human and animal bone contain a high mineral component, and the mineralized portion makes bone a demanding cutting substrate.

In vitro testing of steel implant drills on dental stone produced disastrous results: after only twenty 3 mm-deep osteotomies, the cutting edge had transformed into a wide surface rather than a sharp cutting edge (Fig. 1, Fig. 2). Drill wear and drill geometry are known factors in cutting efficiency and heat generation during implant site preparation^[1,2,3,4,5].

For a deeper mechanical account of what actually happens to the cutting edge of a steel implant drill under normal clinical loading, Crown Down publishes a dedicated article on why implant drills dull.

The solution

The Crown Down Kit solves this safety problem by reorganizing the drilling sequence according to the mechanical properties of tungsten carbide. The kit does not simply reproduce the traditional sequence in reverse, and it does not require drilling down to 2.0 mm. The smallest implant diameter supported by the kit is 3.2 mm, and the drills are selected according to implant diameter and bone zone rather than by repeating the conventional pilot-to-final ascending sequence. For a 3.2 mm implant, the small drill should be 2.75 mm.

For a 4.8 mm implant, the Crown Down Kit first uses a larger-diameter cortical drill corresponding to the implant diameter. This larger drill is mechanically stronger and much more resistant to bending and torsional overload. It is used first to clear or relieve the dense cortical resistance, where the drilling load is highest.

Only after the cortical resistance has been reduced are smaller tungsten carbide drills used to prepare the deeper trabecular portion of the osteotomy. At that stage, the smaller drill is no longer required to cut through the full resistance of the cortical bone. It operates under safer mechanical conditions, with reduced binding, reduced lateral stress, reduced torsional overload and reduced risk of sudden fracture.

Therefore, the Crown Down Kit is not merely the use of tungsten carbide as a drill material. It is the architecture of the kit that makes the use of solid tungsten carbide implant drills safe and practical by matching the drilling order to the mechanical behavior of tungsten carbide. The largest and strongest drill is used first where bone resistance is greatest, while the smaller drills are used only after the dangerous cortical resistance has been relieved.

This solves the safety problem that would exist if solid tungsten carbide drills were used in a conventional ascending sequence. In that conventional sequence, the small tungsten carbide drills, especially 2.5 mm and 3.0 mm drills, are likely to be exposed to unsafe mechanical stresses and may break. In the Crown Down Kit, the sequence avoids overloading the smallest drills and reduces the risk of brittle fracture inside the patient’s bone.

Accordingly, the novelty of the Crown Down Kit lies in the combination of solid tungsten carbide implant drills with a Crown Down architecture specifically designed to avoid brittle fracture and improve safety. The kit enables the safe clinical use of tungsten carbide in implant osteotomy preparation by matching drill diameter, drilling order and bone resistance to the mechanical limitations of the material.

Crown Down publishes a full clinical walkthrough of the sequence described here on the 2-drill protocol page, including the diameter chart that maps implant size to drill #1 and drill #2. The instruments themselves are covered on the cortical drill page and the broader dental implant drills reference; the full tray configuration is described on the surgical implant kit and guided implant drill kit pages.

Irrigation and autogenous bone graft

The exceptional physical properties of tungsten carbide, such as sharpness and high thermal conductivity, do not jeopardize bone tissue. In fact, tungsten carbide drills achieve five times the cutting capacity of steel drills, which allows them to operate at low RPM. Osteothermal necrosis is no longer a problem, and irrigation is not needed. The classic temperature threshold for heat-induced bone tissue injury remains an important reference point in implant osteotomy literature^[1,2,7].

One of the biggest challenges in collecting autogenous bone is the abundant amount of irrigation. Saline dilutes bone chips, which then rapidly move to the suction system. Bone-chip traps were ineffective and not safe; they are no longer in routine use. Large Crown Down drills are excellent bone collectors (Fig. 4). They can even be used to collect autogenous bone from other sites, not necessarily only from the osteotomy. The collected bone is healthy and contains blood plasma and cellular components. Autogenous bone is widely valued because it contains mineralized matrix, cells and biological factors that may contribute to bone regeneration^[8,9,10].

Because carbide drills do not require irrigation, the need to bypass coolant through the guide baseplate and guide tubes is no longer present (Fig. 5). Recent studies discuss irrigation drawbacks, including poor lubrication of cutting instruments in certain situations, washing out growth factors and cell content, prolonging the inflammation phase of healing, increasing postoperative pain and creating other soft- and hard-tissue problems. Drill material, drill design, drilling speed, irrigation and repeated use all influence heat generation and drill wear^{[3,4,5,7,11,12,13]}.

The specific problem of saline reaching the cutting edge through a surgical guide sleeve — and why heat conduction through the drill material solves it at the source — is the subject of a separate technical piece on heat in guided implant surgery.

References

Full bibliography as cited in the article above. Direct DOI links where available.

1. [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):101-107. doi:10.1016/0022-3913(83)90174-9→
2. [2] Chacon GE, Bower DL, Larsen PE, McGlumphy EA, Beck FM. Heat production by 3 implant drill systems after repeated drilling and sterilization. Journal of Oral and Maxillofacial Surgery. 2006;64(2):265-269. doi:10.1016/j.joms.2005.10.011→
3. [3] Mishra SK, Chowdhary R. Heat generated by dental implant drills during osteotomy: a review. Journal of Indian Prosthodontic Society. 2014;14(2):131-143.
4. [4] Mühlhenrich SC, Modabber A, Steiner T, Mitchell DA, Hölzle F. Heat generation and drill wear during dental implant site preparation: systematic review. British Journal of Oral and Maxillofacial Surgery. 2015;53(8):679-689.
5. [5] Oliveira N, Alaejos-Algarra F, Mareque-Bueno J, Ferrés-Padró E, Hernández-Alfaro F. Thermal changes and drill wear in bovine bone during implant site preparation: a comparative in vitro study of twisted stainless steel and ceramic drills. Clinical Oral Implants Research. 2012;23(8):963-969.
6. [6] Thyssenkrupp. Krupp changes in production: launch of WIDIA carbide in 1926. Company history resource.
7. [7] Bernabeu-Mira JC, Pellicer-Chover H, Peñarrocha-Diago M, Peñarrocha-Oltra D. In vitro study on bone heating during drilling of the implant site: material, design and wear of the surgical drill. Materials. 2020;13(8):1921. doi:10.3390/ma13081921→
8. [8] Coyac BR, Sun Q, Leahy B, et al. Optimizing autologous bone contribution to implant osseointegration. Journal of Periodontology. 2020;91(12):1632-1644. doi:10.1002/JPER.19-0524→
9. [9] Bernabeu-Mira JC, Peñarrocha-Diago M, Canullo L, Camacho-Alonso F, Cortes ARG, Peñarrocha-Oltra D. Autologous bone harvested during implant bed preparation: a randomized clinical trial comparing high-speed drilling with irrigation versus low-speed drilling without irrigation. Clinical Implant Dentistry and Related Research. 2024. doi:10.1111/cid.13346→
10. [10] Burchardt H. The biology of bone graft repair. Clinical Orthopaedics and Related Research. 1983;(174):28-42.
11. [11] Gehrke SA, Bettach R, Taschieri S, Boukhris G, Corbella S, Del Fabbro M. Temperature changes in cortical bone after implant site preparation using a single bur versus multiple drilling steps: an in vitro investigation. Clinical Implant Dentistry and Related Research. 2015;17(4):700-707.
12. [12] Chakraborty S, Moufti M-A, Kheder W. The effect of dental implant drill materials on heat generation in osteotomy sites: a systematic review. European Journal of Dentistry. 2024;18(1):65-72. doi:10.1055/s-0043-1768472→
13. [13] Falisi G, Severino M, Rastelli C, Bernardi S, Caruso S, Galli M, Lamazza L, Di Paolo C. SEM-EDX analysis of metal particles deposition from surgical burs after implant guided surgery procedures. Coatings. 2022;12(2):240. doi:10.3390/coatings12020240→