3D Printed vs Milled Restorations: A Clinical Comparison

A printed onlay may fit more closely than a milled one and still fracture under a lower load. A milled material may resist wear better without producing a better colour result. These are not contradictions. They show why the choice between printing and milling requires more than a single claim about accuracy, strength or speed.

The clinical comparison of 3D Printed vs Milled Restorations begins with the proposed restoration and the materials available for it. Manufacturing affects what can be produced and how it must be processed. It does not replace assessment of the tooth, the adhesive conditions or the evidence supporting the selected material.

Compare Materials as Well as Manufacturing Methods

Printing builds an object in successive layers. In the resin workflows discussed here, light initiates polimerization, followed by specified post-processing. Milling removes material from a prefabricated block or disc. Both approaches use a digital design, but they do not necessarily produce restorations with the same composition or properties.

Dental 3D Printing vs Milling is therefore not a comparison between two uniform material categories. A printed ceramic-filled resin, a milled resin composite and a milled lithium disilicate restoration are distinct materials. A study comparing two resin composites cannot establish how either would perform against every ceramic option.

For example, Formlabs describes Permanent Crown Resin as a tooth-coloured material indicated for crowns, inlays, onlays and veneers. Ivoclar describes IPS e.max CAD as a lithium disilicate material with a milling and crystallization workflow. Their processing requirements and supporting evidence must be assessed separately.

Before comparing 3D Printed vs Milled Restorations, define the clinical question: which restoration, on which tooth, using which named materials? Our article on 3D Printed Dental Crowns provides the full-coverage context. A result obtained for an onlay or a flat laboratory specimen does not directly answer every question about a crown.

Keep the Intended Use Explicit

Check whether each candidate material is intended for temporary or definitive use and whether the planned restoration is included in its instructions. “Printed” does not mean temporary, and “milled” does not mean suitable for every definitive application. Manufacturer documentation defines product-specific requirements, while clinical studies address performance under their own study conditions.

The distinction is developed further in our article on Permanent 3D Printed Restorations. It explains why an indication for definitive use and evidence of long-term comparative clinical performance are separate considerations.

What Studies Show About 3D Printed vs Milled Restorations

Fit and Fracture Load Can Favour Different Options

D’haese and colleagues compared 14 printed with 14 milled composite onlays in a laboratory study. Printed onlays had better marginal and internal fit, while milled onlays sustained higher fracture loads. Mean marginal gaps were 78 micrometres for printed specimens and 100 micrometres for milled specimens.

The authors considered both groups’ fit clinically acceptable within the study’s limits. However, the experiment used replicated preparations and mechanical testing rather than long-term patient follow-up. Its useful message is that fit and fracture resistance should be evaluated separately. Better performance in one outcome does not establish overall clinical superiority.

Mechanical Results Depend on the Products Tested

A 2025 laboratory study compared Tetric CAD with Flexcera Smile Ultra Plus using bar and disc specimens. The milled material showed higher flexural strength and microhardness, with lower wear under the study conditions. Mean flexural strength was approximately 248 MPa for Tetric CAD and 97 MPa for the printed material.

Those values describe resistance to bending in the test specimens. They are not direct measurements of crown survival or the force a restored tooth can tolerate. The comparison also changes both material formulation and manufacturing method, so the difference cannot be attributed to milling alone.

Conversely, Tribst and colleagues reported comparable strength for the printed and milled composites tested when adhesively bonded. This does not invalidate the other study. Different products, specimen geometry, support and loading conditions can produce different results. In assessing 3D Printed vs Milled Restorations, identify those variables before interpreting a headline conclusion.

Wear Deserves Its Own Assessment

A separate onlay study evaluated two printed resins and a milled composite after repeated loading and temperature cycling. The milled composite had the lowest occlusal wear and the highest fracture resistance and reliability. The printed resin intended for definitive use showed the highest occlusal wear among the materials studied.

This result is relevant when considering maintenance of occlusal anatomy, but it remains laboratory evidence. It does not establish that every milled restoration will outlast every printed restoration. Our article on 3D Printed Inlays and Onlays connects these material questions with cusp coverage and the remaining tooth structure.

Preparation and Processing Affect the Final Result

For either workflow, design the preparation around the selected material and restorative objective. Confirm the required thickness, insertion path, margin design and finishing access before approving the digital restoration. Do not assume that a preparation suitable for one composite or ceramic automatically meets another product’s requirements.

Milling introduces geometric constraints related to the cutting instruments and machine access. Printing avoids cutting a restoration from a solid block, but still requires control of orientation, supports and subsequent processing. These differences can affect design choices; they do not justify disregarding a material’s minimum dimensions.

The post-production stages are also different. Resin printing requires the prescribed washing, curing and finishing sequence. IPS e.max CAD requires its specified crystallization process after milling. Comparing production times without including these stages gives an incomplete picture of the clinical workflow.

For Dental 3D Printing vs Milling, compare the time from an acceptable scan to a restoration ready for placement, not just the time spent inside the machine. Include design review, handling, finishing and clinical adjustment. The actual result depends on the equipment, material, number of units and the team’s experience.

Post-Curing Is a Manufacturing Step

In a laboratory study of 180 printed inlays, resin type and post-curing conditions influenced how closely the final restoration matched its reference design. This property is called trueness. The study shows that a digital design alone does not determine the final dimensions.

For 3D Printed vs Milled Restorations, quality control must follow the complete workflow. Inspect the processed restoration rather than relying only on the on-screen model. A successful production cycle does not confirm satisfactory seating, margins, proximal contacts or occlusion.

Bonding Follows the Material

The choice of surface treatment and cementation should follow the material instructions and clinical situation. A resin composite and a glass ceramic should not receive the same pretreatment simply because both were produced digitally. Separate preparation of the tooth from treatment of the restoration’s inner surface.

BEGO’s VarseoSmile TriniQ instructions illustrate the need for a validated material-specific workflow and compatible cementation procedures. Ivoclar similarly provides pretreatment and cementation guidance for IPS e.max CAD. These are product instructions, not a universal recipe for all printed or milled restorations.

Aesthetics and Practice Efficiency

Aesthetic comparison includes colour, translucency, surface finish and the ability to maintain those characteristics. In the Tetric CAD and Flexcera laboratory comparison, colour changes after the tested ageing conditions did not differ significantly between groups, although both exceeded the study’s stated acceptability threshold. A mechanical advantage did not translate into a demonstrated colour-stability advantage.

The study does not establish identical appearance in patients, and its ageing conditions cannot reproduce every oral exposure. For anterior treatment, assess the specific material, available shades, planned thickness and finishing system. Our article on 3D Printed Veneers discusses the aesthetic questions relevant to that application.

Dental 3D Printing vs Milling also involves practice-level decisions. Neither manufacturing label supplies a reliable cost per completed restoration. A useful local comparison includes consumables, equipment use, staff time, maintenance and remakes. Compare equivalent clinical outputs rather than the price of resin against the price of a block.

Measure efficiency with a consistent record:

• Record total time from the approved design to a finished restoration ready for clinical placement.

• Include materials, consumables, staff handling and any additional processing equipment.

• Track adjustment time, remakes and the reasons for rejected restorations.

• Compare equivalent restoration types and indications.

Choosing an Approach for the Individual Case

The evidence reviewed here does not support a universal winner for 3D Printed vs Milled Restorations. Several laboratory comparisons favour particular milled materials for mechanical performance, while one onlay study favoured printing for fit. These are useful findings when their materials and methods match the clinical question.

A practical decision sequence begins with the tooth and required coverage. Identify appropriate materials, confirm their indications, then review evidence for the outcomes most relevant to that restoration. Finally, determine whether the practice can reproduce the required production and adhesive procedures.

For example, a posterior partial restoration requires assessment of cusp support and loading before selecting its manufacturing route. An anterior veneer introduces different aesthetic and bonding priorities. These examples illustrate why equipment preference should not decide the restoration before the diagnosis is established.

When discussing options, explain the basis for the recommendation: the chosen material, relevant evidence and practical limitations. Avoid translating an experimental strength difference into a promised number of service years. Laboratory performance helps guide selection, but clinical longevity requires evidence from restorations functioning in patients.

Clinical Summary

The comparison of 3D Printed vs Milled Restorations should bring material selection, fit, mechanical behaviour, aesthetics and workflow into the same decision. Printing and milling can produce useful restorations, but their outcomes depend on the products and protocols involved. The most appropriate option is the one supported for the particular case and delivered with consistent clinical and manufacturing control.

For clinicians developing this approach, the 3D Printed Restorations Course with Dr Ahmed Korayem provides a relevant next step in exploring the technology. The central lesson of the comparison remains clinical: understand the restoration and its material requirements before choosing how to manufacture it.