Infection Prevention & Control

1What & why

Clean in, clean out.

Polishing is an aerosol-generating procedure performed with reusable and single-use items in quick rotation — which makes it a natural stage for infection-control questions: instrument classification, barriers, and what happens to each item after the appointment.

2Spaulding in the polish tray

Semicritical sterilizes.

The itemClass & processing

Reusable metal prophy angle with rubber cup

Prophy angle & cup (reusable)Items contacting mucosa but not penetrating tissue.

→

Semicritical → heat-sterilizeor use disposables and discard

⚙️Low-speed handpiece motor

→

Semicritical → heat-sterilizehandpieces are cleaned, lubricated, and autoclaved between patients — never just wiped

Mouth mirror

→

Semicritical → heat-sterilizecontacts mucosa

light handle with plastic barrier sleeve

Countertop, light handles, chair controlsSurfaces touched during care but not contacting the patient’s mouth.

→

Noncritical → barrier + disinfectsurface barriers changed and/or EPA-registered disinfectant between patients

Three colour-coded columns sorting the polish tray: semicritical items for heat sterilisation, noncritical items for barriers and disinfection, and single-use items for the bin. — **Sort the tray, then the answer follows.** Disposable → bin. Reusable and it touched the mouth → **heat-sterilise**. Touched during care but never in the mouth → **barrier and disinfect**. Wiping a handpiece instead of sterilising it is the classic wrong answer.

3During the procedure

Before, during, after.

Before: barriers placed, hands washed, PPE donned (gloves last), patient eyewear on. During: saliva ejector or HVE controls the pooled slurry and aerosol; touch only barriered surfaces with contaminated gloves. After: disposables (cup, angle, ejector tip, barriers) discarded; handpiece cleaned, lubricated, and heat-sterilized; surfaces disinfected; hands washed after glove removal.

4Make it stick

If it went in the mouth and lives on, it gets the autoclave.

One sorting rule covers most questions: disposable? — trash. Reusable and touched the mouth? — heat sterilization. Never near the mouth? — barrier + disinfect. Wiping a handpiece with disinfectant instead of sterilizing it is the classic wrong answer.

5Beat the exam

"How is the low-speed handpiece processed?"→cleaned, lubricated, heat-sterilized — never just disinfected

"The reusable prophy angle is classified as…"→semicritical — heat-sterilize between patients

"Light handles and chair buttons are…"→noncritical — barriers and/or surface disinfection

"When are hands washed?"→before gloving AND after glove removal

"A glove tears mid-procedure?"→stop, remove the glove, wash hands, re-glove before continuing

"High-level disinfectant?"→kills all microbes except large numbers of bacterial spores — for heat-sensitive semicritical items

"Intermediate-level disinfectant?"→tuberculocidal — the level required for a surface visibly contaminated with blood

"Low-level disinfectant?"→most bacteria, some viruses and fungi — not tuberculocidal; general housekeeping only

"Clinical contact vs housekeeping surface?"→clinical contact = touched during care (light handle, chair buttons) → barrier and/or disinfect. Housekeeping = floors, walls, sinks → routine cleaning

6Check yourself

Between patients, the low-speed handpiece used for polishing must be:

Cleaned, lubricated, and heat-sterilized. Handpieces are semicritical items that tolerate heat — surface wiping is never sufficient. This exact swap is a favorite trap.

6Check yourself

Under the Spaulding classification, a reusable prophy angle that contacts oral mucosa is:

Semicritical — touches mucosa but doesn’t penetrate tissue, so it requires heat sterilization (or use a disposable and discard it).

Recap

The whole thing in 4 lines.

✓Polishing is an aerosol-generating procedure — barriers, PPE, evacuation.
✓Semicritical (angle, handpiece, mirror) → heat-sterilize. Noncritical surfaces → barrier + disinfect.
✓Disposables are single-use — discard, never reprocess.
✓Handpieces: clean, lubricate, autoclave — wiping is the trap answer.