Robotic dentistry is beginning to change one of dentistry’s most operator-dependent procedures: tooth preparation.
In conventional dentistry, the clinician controls the dental bur, handpiece angle, cutting pressure, direction and contact time by hand. In emerging robotic systems, part of that movement can instead follow a digitally planned toolpath designed from scans and virtual preparation data.
But automation does not make the cutting instrument irrelevant.
The robot may control where the instrument moves, but bur geometry, rotational speed, feed rate, cooling and instrument condition still influence how tooth structure is physically removed.
Recent research from 2023 to 2026 suggests that robotic tooth preparation is progressing from experimental trajectory planning toward veneer preparation, crown preparation and early human application. However, the evidence remains emerging, and robotic systems should not yet be treated as replacements for conventional clinical workflows.
What Is Robotic Tooth Preparation?
Robotic tooth preparation uses a digitally controlled system to guide or execute part of the tooth-reduction process according to a predefined virtual preparation.
A simplified workflow may look like:
Digital scan → virtual tooth preparation → toolpath planning → instrument calibration → robotic cutting → comparison with the planned preparation
A toolpath is the calculated route that the cutting instrument follows across the tooth.
This is fundamentally different from conventional preparation, where the dentist continually determines the path through visual and tactile feedback.
A 2023 robotic veneer study used digital surface design and trajectory planning to control preparation movements. The reported maximum positional errors at selected feature points were approximately 0.180 mm, 0.104 mm and 0.142 mm across the X, Y and Z directions, demonstrating the technical feasibility of digitally planned bur movement in an experimental setting.
From Digital Design to Real Tooth Preparation
The field has moved quickly.
A 2025 study investigated semi-active robot-assisted porcelain veneer preparation on 20 maxillary central incisors, providing further evidence that robotic control can be applied to clinically recognizable restorative preparation designs rather than only simple laboratory trajectories.
Even more significantly, a 2025 early human feasibility report described a semi-automated robotic tooth preparation system in six patients who completed treatment. The reported root mean square deviation between the planned and achieved preparations was 39 μm, and five prepared crowns were permanently cemented during the same visit. Larger controlled studies are still required before those results can be generalized.
The direction is clear: tooth preparation is becoming increasingly measurable, digitally planned and potentially machine-executable.
Why Dental Bur Selection Still Matters
A robotic arm can reproduce movement, but movement alone does not cut enamel or dentine.
The rotary cutting instrument still creates the physical interaction with the tooth.
Important variables include:
Bur Geometry
A bur’s diameter, head shape, working length and cutting surface affect which areas contact the tooth and how material is removed.
For example, a pear-shaped bur, tapered diamond and cylindrical cutting instrument do not produce identical preparation geometry even when following the same movement.
The digital system therefore needs a cutting tool whose geometry corresponds with the planned preparation.
Bur Material and Cutting Surface
Carbide burs remove material through cutting blades, while diamond burs use abrasive diamond particles.
That fundamental difference remains relevant whether the handpiece is held by a dentist or positioned by a robotic system.
Automation may control the movement with greater repeatability, but it cannot make two different cutting surfaces behave identically.
Robotic Dentistry Introduces Another Important Variable: Feed Rate
Dentists commonly discuss bur rpm, but robotic preparation introduces a second important engineering concept: feed rate.
Rotational speed describes how quickly the bur rotates.
Feed rate describes how quickly the cutting instrument advances along the planned preparation path.
In manual dentistry, the clinician continuously adjusts this movement based on resistance and tactile feedback. In a robotic system, these movements can potentially be programmed and controlled.
Research into robotic tooth preparation has therefore examined combinations of rotational speed, feed movement, grinding force and preparation trajectory, rather than treating rpm as the only variable.
This distinction may become increasingly important as dentistry moves toward digitally controlled cutting.
A Precise Robot Can Still Generate Heat
Robotic accuracy does not eliminate the biological considerations of tooth preparation.
Mechanical cutting still generates friction, force and heat.
A 2025 study examining robot-assisted preparation of cracked teeth developed a thermal-mechanical model to optimize preparation parameters. Under the investigated experimental conditions, optimized parameters reduced normal grinding force by 19.32% and surface grinding temperature by 56.26% compared with the study's conventional parameter settings.
The practical lesson is broader than robotics:
speed, feed rate, cutting efficiency, contact time and cooling should be considered together.
A highly accurate trajectory is not sufficient if the cutting parameters are biologically inappropriate.
Why Bur Wear Could Become More Important With Automation
During conventional tooth preparation, an experienced clinician may notice that a bur is no longer cutting efficiently and unconsciously alter pressure or movement.
Automated systems depend more heavily on predictable interaction between the programmed trajectory and the cutting tool.
As a bur wears, its cutting behavior may change. That means instrument condition, runout, cutting efficiency and replacement intervals could become increasingly important considerations in robotic workflows.
This is still an emerging research area, so it would be premature to claim that current robotic systems automatically compensate for every form of bur wear.
However, as tooth preparation becomes more standardized, tool-condition monitoring may become an important part of achieving repeatable material removal.
Where Do Today's MR.Bur Burs Fit?
Current MR.Bur products are designed for conventional clinical handpiece workflows, not automatically for robotic systems. Compatibility with a dental robot should never be assumed without system-specific validation.
However, existing bur designs help illustrate why cutting geometry remains clinically important.
The MR.Bur 330 Pear Carbide Bur FG uses a pear-shaped carbide cutting head and FG shank for conventional high-speed restorative procedures such as cavity preparation.
The MR.Bur 245 Carbide Bur FG is available in plain-cut and cross-cut configurations, providing another example of how flute design and bur geometry influence cutting behavior in traditional restorative workflows.
For prosthodontic preparation, the MR.Bur Crown & Bridge Preparation Kit FG combines burs intended for conventional crown, bridge and veneer preparation workflows.
These products should be viewed as examples of today's rotary-instrument principles rather than claims of robotic compatibility.
Robotic Dentistry Is Moving Beyond Straight-Line Drilling
One of the most important recent developments is the ability of robots to execute increasingly complex nonlinear toolpaths.
A 2026 in vitro study of robotic osteotomy used multi-axis, surface-conforming trajectories rather than only straight drilling. The robotic approach achieved lower angular deviation and better reproduction of the planned geometry than a static guide-assisted workflow in that experimental model. A Lindemann bur was mounted in the robotic handpiece and the system executed preplanned trajectories under continuous irrigation.
Although this study involved tooth autotransplantation rather than crown preparation, it demonstrates an important engineering direction: robots are becoming capable of moving rotary instruments along complex three-dimensional paths.
Will Robotic Tooth Preparation Require Special Dental Burs?
Not necessarily, but compatibility will become more demanding.
Future systems may need to account for:
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Bur shank and chuck compatibility
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Exact cutting-head dimensions
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Working length
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Rotational speed limits
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Instrument runout
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Cooling configuration
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Tool calibration
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Bur wear
Some automated systems may use conventional-style rotary instruments, while others may use proprietary cutting tools or alternative technologies.
Therefore, a conventional FG bur should not be assumed suitable for a robotic platform simply because its shape matches the planned preparation.
Frequently Asked Questions
Can a robot prepare a tooth for a crown?
Early research suggests that robotic systems can execute crown and veneer preparation workflows. A small 2025 human feasibility study has also reported robot-assisted restorative tooth preparation, but larger clinical trials and long-term evidence are still needed.
Does robotic dentistry still use dental burs?
Some robotic systems use high-speed handpieces and dental burs, while other experimental systems have investigated laser-based cutting. The technology is therefore not limited to one cutting method.
Does bur shape matter if a robot controls the movement?
Yes. The robot controls the trajectory, while the cutting instrument still determines the geometry and mechanics of contact with tooth structure.
Will robots replace dentists during tooth preparation?
Current evidence does not support that conclusion. Robotic tooth preparation remains an emerging technology, and most published evidence is still based on laboratory studies, small experimental datasets or early clinical feasibility work.
The Future Is Not Bur-Free Dentistry
Robotic dentistry may eventually change how a bur is moved, but it does not remove the principles of rotary cutting.
If anything, digital automation makes variables such as bur geometry, rotational speed, feed rate, cooling, calibration and instrument wear easier to define and potentially more important to control.
The future of tooth preparation may therefore combine two disciplines that once seemed separate:
digital precision and cutting-instrument science.
For dentists, understanding the dental bur may remain just as important when a robot holds the handpiece as when the clinician does.
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