Chairside vs. Lab-Side CAD/CAM: Which Workflow Wins—and When?

In my last article, we took a deep dive into the power of the lab‑side workflow. But the reality is, chairside and lab‑side aren’t enemies – they’re more like different tools in the same box, each with a sweet spot. This post is a head‑to‑head comparison to help you decide: When should you keep the case in‑house? When should you send it to the lab? And how can you make both work together?

1. Chairside Systems: Speed & the One‑Visit Experience

CEREC, Planmeca, Ritter Concept – these systems promise one thing most dentists and patients love: same‑day dentistry.

1.1 Time efficiency

• Traditional lab: 1‑2 weeks (impression → courier → lab work → return → try‑in).
• Chairside: compressed into 2‑3 hours.
• Patient benefit: one anesthesia visit, no temp crown worries, no second trip.

1.2 Simpler clinical steps

• No conventional impression material (great for patients with a strong gag reflex).
• Digital scan can be checked immediately for margin clarity.
• Design, mill, sinter, glaze – all under your control.

1.3 Best cases for chairside

• Single inlay/onlay (posterior) – strong evidence. Long-term clinical studies report 88.7% success after 17 years and 87.5% after up to 27 years of clinical service for chairside CAD/CAM inlays and onlays^[1].
• Single posterior crown (premolar/molar) – highly standardizable.
• Temporary crowns – can be fabricated chairside, though for pure speed, a prefabricated temp + bis‑acryl may be faster.
• Simple veneers (1‑2 units, easy colour matching).

The limits are clear: limited material selection (mainly glass‑ceramic and resin blocks). Chairside CAD/CAM ceramics typically offer flexural strength ranging from 160 MPa (feldspathic) to 420 MPa (lithium disilicate) and up to 1200 MPa (zirconia); no complex layering for multiple anterior units, and multi‑layered zirconia requires lab processing.

2. The Lab’s Unbeatable Strengths: Materials, Aesthetics & Complexity

Once you move beyond the “single inlay” comfort zone, the lab’s real value shines.

2.1 Breadth of materials

• Chairside‑millable: lithium disilicate (IPS e.max CAD), resin blocks, fast‑sinter zirconia.
• Lab‑available: multi‑layered zirconia (20+ layers), lithium silicate, pressed ceramics, hybrid ceramics, PEEK, fibre‑reinforced composite, noble metal‑ceramics – and much more.
• Some high‑translucency or high‑strength materials need special sintering or pressing that a chairside furnace cannot do.

2.2 Ultimate aesthetics – individual layering & staining

Chairside stain kits give you “standardised” colour. A skilled technician can:

• Build layer by layer (dentin, enamel, incisal, characterization porcelains).
• Mimic incisal halo, opalescence, white spots or craze lines.
• Custom‑match adjacent teeth one‑by‑one.

For anterior aesthetic cases (≥3 veneers, severe discolouration, tetracycline stains), chairside is simply not ready.

2.3 Complex restorations

• Implant bridges, Hader bars, custom abutments – need precise interfaces and milling strategies.
• Full‑mouth rehabilitation (>10 units) – chairside milling time would be 2‑3 hours of pure cutting; patients won’t wait that long.
• Removable partial denture frameworks – require casting or laser sintering.

2.4 Evidence on margin fit

A direct comparison of chairside vs. lab-side all-ceramic crowns found a significant influence of the manufacturing process on marginal fit (p = 0.0064), confirming that fabrication method matters^[2]. Importantly, preparation quality itself has a substantial impact: studies show average marginal gaps of 36.6 μm for excellent preparations, 67.2 μm for good preparations, 87.6 μm for fair preparations, and 104 μm for poor-quality preparations – regardless of which chairside system is used^[3]. This underscores that preparation excellence is the single most important factor in achieving precise margins, whether you go chairside or lab.

3. The Hybrid Model: In‑office Scan + Lab Design/Fabrication

The Most Practical “Best of Both Worlds” – probably the most cost‑effective digital workflow today, especially for practices that don’t want to invest in a full in‑house milling setup.

Why it’s so efficient

For the clinic: No mill, no sintering oven, no glaze furnace (saving substantial capital investment). Only need one intraoral scanner (approx. US$14k‑$28k). Still offer “no‑putty” comfort. Can handle all case types – from single crowns to full arch.

For the lab: No more distorted impressions or courier delays. Digital models are easy to archive and retrieve. Batch milling reduces cost per unit.

How to make the hybrid model work smoothly

• Set cloud standards – agreed file format (STL/PLY), bite registration protocol, shade photos (use shade tab + adjacent tooth).
• Tiered turnaround – urgent (24h), routine (3‑5 days), aesthetic (7‑10 days).
• Quarterly calibration – compare intraoral scan data with lab reference scans to ensure accuracy. Extracted studies note that extraoral scanners show higher accuracy than intraoral scanners, making periodic cross‑validation valuable^[4].

Best clinic for hybrid: clinics doing 10‑30 units/month, already have or plan to buy an intraoral scanner, and don’t want the extra investment in milling.

4. Cost, Learning Curve & Decision Matrix

4.1 Cost comparison (USD, approximate, based on 1 USD ≈ 7 RMB – adjust for your region)

Key takeaway from industry sources: Chairside requires >200 units/year to break even (saved lab fees vs. depreciation + consumables). Below 100 units/year → hybrid is clearly more economical. Above 400 units/year + enough chairside time → chairside gives patient‑satisfaction premium (but not necessarily cost savings). Clinics that handle a high number of single‑unit restorations per month find that chairside milling can pay off relatively quickly.

4.2 Learning curve

Easiest to learn: hybrid (dentist focuses on scanning, lab does design). Steepest curve: chairside (dentist becomes half‑technician).

4.3 Clinical decision matrix: which cases keep in‑house?

5. Future Trends: From “Either/Or” to “Seamless Together”

Over the next 3‑5 years, digital dentistry won’t be about one workflow killing the other. Boundaries will blur.

6. Final Advice for Dentists: Should You Buy a Chairside System?

💡 One‑sentence takeaway
Single posterior inlay or crown? Go chairside. Anterior aesthetics? Go lab. For everything else – intraoral scan plus a good lab. That’s the most practical, future‑proof digital workflow today.