Midmark · Dental Equipment · $7,000 – $15,000
A used UltraComfort in decent shape, maybe 6,000–8,000 hours of clinic time, runs $10K–$12K; if it's been sitting 18 months without service or the hydraulic fluid is black, you're looking at the $7K end and a $2,000 rebuilding budget. That service gap kills value faster than anything else.
Pump the chair up and down 20 times straight - if it drops more than 1 inch after holding pressure for 30 seconds, the seal kit is toast and that's $1,200–$1,600 out of your pocket. Check the headrest adjustment mechanism by hand; if it's grinding or loose, the ball joint replacement is a $600 part plus labor. Flip the chair over and inspect the foot pedal linkage for cracks; a new foot pedal assembly is $350 but easy to replace yourself.
California DSOs are eating up used UltraComforts because new ones are $22K–$26K and the lease math doesn't work for satellite offices; the Los Angeles and Orange County markets specifically see 15–20 units move per quarter. Texas is the other hot zone - Heartland Dental consolidation means lots of older chairs getting cycled out of smaller practices.
| Model | Brand | Used Price | Key Spec | Value Score |
|---|---|---|---|---|
| Midmark UltraComfort ✓ | Midmark | $7,000–$15,000 | Dental chair, ergonomic, 300 lb capacity... | ●●●●● |
| ProMax 3D Plus | Planmeca | $40,000–$85,000 | CBCT 3D imaging, cephalometric, 23x26cm FOV... | ●●●●○ |
| OP 3D Pro | KaVo | $35,000–$70,000 | CBCT 3D, 16x13cm FOV, low dose... | ●●●●○ |
| Orthophos SL 3D | Dentsply Sirona | $38,000–$75,000 | CBCT panoramic ceph, 11x10cm FOV... | ●●●●○ |
You can use ISO 46 hydraulic oil from any dental equipment supplier - it's literally the same fluid. Midmark charges a markup. Use Mobil DTE 25 or equivalent; $45 a quart versus $120 for the branded bottle. Change it every 2 years or after 5,000 chair hours.
Midmark's official service contract runs $1,200–$1,800 per year depending on your region and whether you're in a metro area or rural clinic. That covers two preventive visits, parts at cost, and 24-hour emergency dispatch. Most clinic chains self-insure after year three because failures are predictable.
The hydraulic lift seal kit fails every 4–6 years of daily use; that's the number-one repair I see. Second is the foot pedal solenoid valve, which gets sticky around year 5. Third is upholstery replacement, which isn't a failure but happens around $800–$1,200 per chair when clinics refresh.
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I save clinics 2–3 weeks of downtime by shipping a complete hydraulic seal kit and foot valve assembly at purchase instead of making them hunt for OEM parts after delivery. That's $1,800 in preventive parts, installed in 45 minutes, versus a $3,500 emergency service call when the chair fails mid-schedule.