Dental Suction Systems Explained: Wet-Ring vs Dry

More installation delays come from suction than from any other part of a dental unit. The chair arrives, the plumber discovers the clinic has no floor drain, and the opening slips by a month. Here is what to settle before the container leaves.

Two circuits that are not interchangeable

	Wet-ring suction	Dry suction
How it works	Water-sealed pump; water and aspirate drain together	Air/liquid separated at the chair; pump moves air only
Water use	Continuous	Very low
Purchase price	Lower	Higher
Best for	Clinics with reliable mains water and a floor drain	Markets with intermittent or metered water; upper-floor clinics
Plumbing	Floor drain usually required	Can be plumbed to a wall trap

Mobile, single-chair or central

• Mobile suction unit — a wheeled pump with a bottle, no plumbing. For one chair, outreach and clinics in rented rooms.
• Single-chair suction — a compact pump under or beside the unit.
• Central suction — one pump and separator serving three to five chairs through a pipe network; the standard for multi-chair clinics.

Five things to confirm before shipping

1. Hose diameters on the chair side (saliva ejector and high-volume evacuator).
2. Whether the unit ships with a saliva ejector only, or with a high-volume evacuator as well.
3. Floor drain or wall trap.
4. Water availability and pressure at the clinic — this decides wet or dry.
5. Amalgam separator requirement in the destination country.

VOTEN supplies mobile, single-chair and central suction (dry or wet-ring) and will confirm the hose and drain configuration on the proforma invoice so nothing is discovered at installation.