Building a dental office in California: planning the X-ray rooms.

A dental office looks like a standard tenant improvement on paper. Most of the work is walls, cabinetry, plumbing and power. The X-ray equipment is different. It brings a second set of rules, from a different agency, that the design and schedule need to account for from the start.

Here is what owners, dentists, landlords and brokers should know before the first drawings are made.

State registration within 30 days

In California, X-ray machines are regulated by the California Department of Public Health (CDPH), Radiologic Health Branch. Under Title 17, California Code of Regulations, section 30108, anyone who acquires an X-ray machine must register it with the Branch within 30 days.

• Online: registration is done through the Branch’s Radiation Machine Registration Portal.
• Information needed: the registrant and facility details, the physical address, and each machine’s manufacturer, model, number of X-ray tubes, installation date and room.
• Site specific: registration is tied to the location. A new practice or second office registers the facility and the machines on site.
• Changes: a move, a new installation location, or a machine sold or removed must also be reported in writing within 30 days.
• Term: a registration is valid for two years. Renewal notices are mailed 120 days before it expires.

Shielding plan check in some counties

According to the California Dental Association, new construction in Los Angeles and San Diego counties needs a shielding plan check from the county environmental health department. This is separate from the city building permit.

In Los Angeles County, the Radiation Management program states that radiation shielding designs “must be approved by this office for all X-ray and P.E.T. / C.T. rooms.” Dental intraoral, panoramic, cephalometric and cone beam units are all listed. The room sketch must show:

• Room dimensions and scale, with compass orientation.
• Beam directions and the percentage of use in each.
• Type and thickness of wall, ceiling and floor materials.
• What occupies the adjoining rooms, and the floors above and below in a multi-story building.
• Locations of the dental chair and the operator position.
• Thickness, location and size of any existing or proposed lead shielding.

A physicist’s report can replace parts of the form. The county fee is charged per machine; for units of 70 kVp and lower it is listed at $622. Outside these counties, ask the local agency and the equipment vendor what review applies.

What the inspector looks for later

CDPH inspects dental X-ray machines on average every five years. Several items on its checklist start with the build-out:

• Signage: rooms with a permanently installed X-ray machine must have “Caution X-Ray” posted at the entrances (17 CCR 30305(c)).
• Exposure switches: inspectors check that switches are in shielded locations in the room.
• Room shielding: its use is observed during the walk-through.
• Postings and records: the Notice to Employees, technique charts for each unit, dosimetry and QA records, and training certificates for dental assistants.

Is a dental office an OSHPD 3 clinic?

Usually not. The Department of Health Care Access and Information (HCAI) explains that OSHPD 3 requirements apply only to clinics licensed under Health and Safety Code section 1200 or 1250. A dentist’s office that is not a licensed clinic is not subject to them. Where OSHPD 3 does apply, the local building department enforces it.

Practical steps

• Choose the imaging equipment early. Its type, size and power drive room layout, shielding and electrical work.
• Get the vendor’s installation requirements before the walls are designed.
• In Los Angeles or San Diego County, submit the shielding plan before the X-ray room walls are built, not after.
• Show lead locations on the drawings, so lead-lined drywall or doors are priced and scheduled with the framing.
• Put the 30-day registration on the opening checklist, with the date each machine is installed.
• Landlords and brokers: confirm in the work letter who provides shielding, signage and any physicist’s report.

This article is a general summary of published state and county guidance, not legal, code or radiation-safety advice. Requirements depend on the equipment, the county and the city; confirm them with CDPH, your local agencies and a qualified expert. Builteck’s in-house architect coordinates equipment and shielding requirements with the design on every dental office we build.

See our tenant improvement contracting and commercial services, or request a bid for your project.

Sources

• CDPH Radiologic Health Branch: X-ray machine registration (opens in a new tab)
• CDPH: New facility registration guide (opens in a new tab)
• CDPH: Dental X-ray inspection, compliance and enforcement (opens in a new tab)
• CDPH: Preparing for a dental inspection (opens in a new tab)
• California Dental Association: Radiation safety FAQ (opens in a new tab)
• Los Angeles County Radiation Management: Radiation shielding plan application (opens in a new tab)
• HCAI: Advisory Guide A17, OSHPD 3 clinics (opens in a new tab)