How often does the dental unit need to be disinfected?

The dental unit brings together components with different levels of risk in a single assembly, which is why the approach differs from one part to another. After every patient, the rotary handpieces (turbine and micromotor) and the reusable suction cannulas must be cleaned, disinfected and sterilised in the autoclave. Clinical contact surfaces (the patient chair, the curing light housing and the outside of the suction arms) are cleaned and given intermediate- or low-level disinfection by wiping with specific biocidal products. At the end of the day, the internal water lines and the suction system are flushed and disinfected with special descaling and disinfecting solutions to prevent biofilm formation and the risk of Legionella.

Which products are used for high-level surface disinfection in a dental practice?

For high-risk surfaces that need high-level disinfection after every patient, Peroklin or RTU Surface Disinfectant and Dezicon are used. For medium-risk surfaces, intermediate-level products such as Klinosept, Klinomed™ Wipes or Deziamino are sufficient. Every product must be approved as a biocide by the Ministry of Health and used according to its technical data sheet.

What is the difference between critical, semi-critical and non-critical instruments?

Critical instruments come into contact with or penetrate body tissue (needles, burs, turbines, contra-angle handpieces, implants, periodontal probes) and must be sterilised in an autoclave. Semi-critical instruments come into contact with intact mucous membranes (dental mirrors, suction tips, temporary trays) and require at least high-level disinfection. Non-critical instruments only touch intact skin (tweezers for non-critical materials, paper forceps) and need only cleaning and low-level disinfection.

How should reusable dental instruments be reprocessed correctly?

Reprocessing follows five mandatory steps in strict order: cleaning (manual or automated, with a concentrated enzymatic disinfectant detergent or Klinozyme, including ultrasonic cleaning for hard-to-reach areas), high-level disinfection (with 2% Dezicon or high-level disinfectant wipes), rinsing with sterile water, packaging, steam autoclave sterilisation (or cold chemical sterilisation with Oxoklin for heat-sensitive devices) and, finally, dry storage of the instruments. Each cycle is recorded in the sterilisation log, with physical, chemical and biological control indicators.

Which documents does the DSP check during a hygiene inspection in a dental practice?

A DSP (public health authority) inspection checks the daily cleaning and disinfection log (completed and signed), the instrument disinfection and/or sterilisation log with records of cycles and control indicators, the biocidal approvals of the products used, the provision of liquid soap and hand disinfectant in restrooms, a valid contract with an authorised hazardous medical waste company and proof of staff training in infection prevention, in line with current regulations (including Ministry of Health Order no. 2209).

Disinfection protocol for dental offices

The dental office is one of the most demanding environments in terms of infection control. Direct contact with blood and saliva, aerosols generated by the turbine and ultrasonic scaler, as well as the constant handling of reusable invasive instruments, turn every procedure into a potential transmission vector. A clear, consistently applied, and documented disinfection protocol is the foundation that protects both patients and the medical team, in accordance with European standards and national legislation.

Discover in the lines below what a complete sanitation protocol for a dental office looks like!

Legal framework and mandatory standards for disinfection in the dental office

Any disinfection protocol must be built on the foundation of the regulations in force. At the community level, the primary reference is Regulation (EU) No. 528/2012 concerning the making available on the market and use of biocidal products, supplemented by Implementing Regulation (EU) No. 414/2013 and Delegated Regulation (EU) No. 492/2014 regarding the renewal of authorizations.

At the national level, the framework is defined by a series of normative acts that every office should be familiar with:

Emergency Ordinance no. 41/2019 – approval of active substances and authorization of biocidal products;
Government Decision no. 617/2014 and subsequent amendments – institutional framework for the application of Regulation (EU) No. 528/2012;
National Register of Biocidal Products – mandates the exclusive use of approved products;
Ministry of Health Order no. 1761/2021 – technical standards regarding cleaning, disinfection, and sterilization in sanitary units;
Ministry of Health Order no. 119/2014 – general hygiene standards for the living environment;
Ministry of Health Order no. 1226/2012 – collection and disposal of medical waste.

Risk zones in a dental office

Before determining which disinfectants you use and how often, you must classify the office areas according to the risk of biological contamination. This classification determines the level of cleaning and disinfection required for each surface.

High-risk zones: directly involved in the medical act, with an increased potential for contamination with blood, saliva, or other biological fluids. They require high-level cleaning, disinfection, and/or sterilization measures.
Medium-risk zones: with frequent contact with personnel and patients, but without direct contact with biological fluids. They require medium-level cleaning and disinfection.
Low-risk zones: without direct contact with the patient or biological material. They require periodic cleaning and, as appropriate, low-level disinfection.

Hand hygiene of the medical staff

No surface or instrument disinfection protocol can compensate for poor hand hygiene. There are five distinct procedures, chosen according to the type of intervention:

Simple washing with soap and water;
Hygienic disinfection by washing with disinfectant soap;
Hygienic disinfection by rubbing with a hydroalcoholic solution;
Surgical disinfection by washing with water and surgical soap, mandatory before invasive procedures (extractions, scaling, implantology);
Surgical disinfection by rubbing with a hydroalcoholic solution.

See the entire range of Klintensiv products for hand disinfection!

The basic rules remain unchanged: wearing rings, bracelets, watches, or other jewelry is forbidden, as are long, polished, or artificial nails, which retain microorganisms and prevent effective disinfection.

Disinfection protocol for surfaces in the dental office

Surfaces are cleaned and disinfected according to the assigned risk level. Disinfection complements cleaning, does not replace it, and never substitutes for sterilization. A dirty surface cannot be effectively disinfected because organic material protects microorganisms and inactivates the active substance.

High-risk surfaces

The dental unit (patient chair, light-curing lamp, console, and the exterior of suction hoses) requires disinfection after every patient. For these surfaces, disinfectants such as Peroklin or RTU surface disinfectant are used.

Medium-risk surfaces

Work surfaces, desks, and equipment with frequent contact (keyboards, phones) require medium-level disinfection at least twice a day and whenever necessary. For these, medium-level products are suitable: Klinosept, Klinomed™ Wipes, or Deziamino.

Low-risk surfaces

Walls, ceilings, blinds, and ventilation devices are cleaned according to the procedure, whenever necessary, with low-level disinfection as needed.

Application methods and general rules

Surface disinfectants can be applied by spraying, wiping with a cloth, or nebulization. For airborne disinfection of room surfaces – useful periodically or in situations with particular epidemiological risk – Desogen Aero ensures terminal disinfection of hard-to-reach surfaces. This procedure is an additional safety measure and is not necessary in the daily routine at the end of the shift, where airing out and manual surface disinfection are sufficient. High-level disinfection is applied in spaces with healthcare-associated infections, areas with epidemiological risk, or in the dental operating room.

Here are some general rules for any office:

a daily/hourly schedule is maintained for each room, indicating the type of operation, time, person responsible, disinfectant used, concentration, preparation date, and contact time;
disinfectant solutions are used only during their stability and effectiveness period;
it is strictly forbidden to mix different types of disinfectants;
personnel respect occupational health and safety standards and wear appropriate protective equipment.

Related areas: restrooms, reception, waiting room

Restrooms and changing rooms are equipped with liquid soap, hand sanitizer, and paper towels, and cleaning and disinfection are carried out at least twice a day and whenever necessary, with special attention to frequently touched surfaces: toilets, faucets, handles. For sanitary facilities, Fizzy Tablet (high-level disinfectant for toilet bowls, siphons, and floors) and Igienic Plus (daily cleaning, as is, 3–5 minutes) cover routine maintenance.

In the reception and waiting rooms, door handles are disinfected at least three times a day, furniture and floors are cleaned daily with detergent and disinfectant, and high-risk areas (tables, chairs, children's toys) are disinfected whenever necessary. For floors, Deziamino or Dezicon can be used.

Disinfection protocol for instruments in the dental office

Instrument reprocessing is the most sensitive component of the protocol because any error can directly transmit a pathogen from one patient to another. Everything starts with the correct classification of instruments according to the level of tissue contact.

Instrument classification

Critical instruments: contact or penetrate body tissues, including the vascular system. Dental examples: needles, forceps, curettes, dental burs, contra-angle handpieces, turbines, implants, periodontal probes. These strictly require autoclave sterilization if the material allows it. If an office does not have an autoclave, a contract with an authorized external sterilization center is recommended. For devices sensitive to high temperatures, sterilization can also be physical-chemical (for example with hydrogen peroxide or peracetic acid), according to the manufacturer's instructions.

Semi-critical instruments: come into contact with intact mucous membranes or skin with breaks in continuity (dental mirrors, aspirators, temporary prostheses, temporarily used trays). They require at least high-level disinfection if there is an increased risk; otherwise, medium-level disinfection.

Non-critical instruments: come into contact only with intact skin or frequently touched surfaces (tweezers for handling non-critical materials, paper holders, clamps that do not touch the mucosa). Low-level cleaning and disinfection apply.

Mandatory reprocessing stages

Correct reprocessing follows a strict sequence, where each stage prepares the ground for the next:

Cleaning. Manual or automatic, with a detergent with a surfactant effect, for the complete removal of organic material. Hard-to-reach areas (turbine heads, contra-angle handpieces, aspirator tips, bur channels) are cleaned with ultrasound or special brushing. A tri-enzymatic detergent such as Klinozyme is ideal for manual cleaning or in ultrasonic baths.
High-level disinfection. Solutions are used according to the manufacturer's instructions, in vats with lids. The name of the solution, date, and preparation time are recorded. For this stage, Dezicon or high-level disinfectant wet wipes can be used.
Rinsing. After high-level disinfection, instruments are rinsed with water or sterile water.
Packaging. Instruments must be dry and packaged to prevent contamination. The duration of sterility maintenance depends on the type of packaging and manufacturer recommendations.
Sterilization. For critical or semi-critical instruments, when recommended. It is performed by a steam autoclave under pressure, respecting the time, temperature, and pressure specified by the manufacturer. Other chemical methods are reserved for heat-sensitive devices, for example, the cold chemical sterilant Oxoklin. Avoid overloading the autoclave and use physical, chemical, and biological indicators to control the efficiency of the process.
Storage. Sterile packages are handled as little as possible, and the "first-in, first-out" rule is followed.

Traceability and maintenance

All sterilization and disinfection cycles must be recorded in the dedicated register, with the date, time, operator, and product used. The autoclave is checked daily (pressure, temperature, cycle time), and the disinfectants used must be exclusively products approved by the Ministry of Health, applied according to technical instructions.

Disinfection protocol for the dental unit

The dental unit deserves distinct attention because it brings together high-risk surfaces, rotary instruments, and water circuits in a single assembly. Being classified as a high-risk zone, the entire unit (patient chair, turbine, micromotor, light-curing lamp, and aspirator) is high-level disinfected after every patient.

After each patient, all surfaces and equipment they have come into contact with are cleaned and disinfected: dental chair, instrument tray, operating light, handles, rotary instruments (turbines, contra-angles), saliva ejector, instrument tray, and reusable items. Rotary instruments pose a particular challenge because internal channels retain biological material, which is why turbine heads and contra-angle handpieces must be cleaned with ultrasound or special brushing before reprocessing.

For high-level disinfection of unit surfaces and equipment, disinfectants such as Peroklin or RTU surface disinfectant (as is, 60 minutes) or Dezicon (2%, 60 minutes) are used. At the end of the day, the unit protocol extends to water tubes and aspirators, which are disinfected to prevent biofilm formation and bacterial proliferation, including the risk of Legionella in water circuits.

Daily disinfection protocol in the dental office

At the beginning of the day

Checking stocks of disinfectants, consumables, cloths, mops, protective equipment, and sterilization materials (autoclave bags, chemical and biological indicators);
Preparing treatment rooms with utensils dedicated to each zone: treatment chairs, dental unit, sinks, work surfaces, observing color codes to avoid cross-contamination;
Preparing disinfectant solutions according to manufacturer instructions (dilution, contact time).

After each patient

Cleaning and disinfecting surfaces and equipment the patient has come into contact with: dental chair, instrument tray, operating light, handles, rotary instruments, saliva ejector, instrument tray, and reusable items;
Hand hygiene: washing or disinfection according to standard procedures;
Cleaning and disinfecting reusable instruments (dental mirror, probe, tweezers) and devices that cannot be sterilized immediately, according to the risk level;
Disposal of hazardous waste generated during the consultation (needles, blades, contaminated materials) into dedicated containers.

At the end of the day

Complete terminal cleaning of the treatment room: floor, furniture, fixed equipment, sinks, and work surfaces;
Disinfecting the dental unit, water tubes, aspirators, and other frequently used equipment;
Cleaning and disinfecting sanitary facilities for patients and staff;
Sterilizing critical and semi-critical instruments according to procedures, using physical and biological indicators;
Recording operations performed in the cleaning/disinfection register (date, time, responsible person, products used).

Medical waste management

A complete disinfection protocol includes the correct management of waste, regulated by Ministry of Health Order no. 1226/2012 and Law no. 211/2011. Waste is collected at the point of generation, separately, according to type.

Sharp/piercing waste (anesthetic needles, scalpel blades, burs, lancets) is collected exclusively in medical waste collection containers, puncture-resistant, with a safety lid; containers are not overfilled and are permanently closed before disposal. Contaminated medical waste (gloves, compresses, swabs, absorbent materials, disposable equipment, blowers, saliva ejectors) is collected in special, resistant, appropriately marked bags, which are sealed after filling.

Temporary storage is carried out in dedicated, secure, clean, and ventilated spaces, with restricted access. Disposal is carried out exclusively through an authorized company, with which the office must have a valid contract, and traceability is ensured through handover-takeover forms. It is forbidden to mix hazardous medical waste with household waste, and personnel must be periodically trained.

DSP compliance checklist for the dental office

Before a DSP (Public Health Directorate) inspection, quickly check the following items:

Daily cleaning and disinfection register, completed and signed;
Dedicated cleaning equipment coded by zone to avoid cross-contamination;
Disinfectant products approved as biocides by the Ministry of Health / CNPB, used according to the technical data sheet;
Instrument disinfection and/or sterilization register, with records of cycles and control indicators;
Sanitary facilities equipped with liquid soap, hand sanitizer, and paper towels;
Valid contract with an authorized company for the collection and disposal of hazardous medical waste;
Personnel trained in hygiene and infection prevention, in accordance with regulations in force (including Ministry of Health Order no. 2209).

Download the hygiene and disinfection guide for dental offices created by Klintensiv experts!