11.1 Instrument Inspection, Cassette Assembly, and Packaging Protocols

Instrument Inspection and Packaging

Packaging lets a sterilizing agent reach clean instruments and then maintains the sterile barrier during handling and storage. A pouch, wrap, or rigid container must be cleared or labeled for the sterilization method, sized for the contents, and used according to both the packaging and sterilizer instructions.

Inspect and Maintain Instruments

Inspect cleaned, rinsed, and dry instruments under adequate light. Use magnification when the device design, staff vision, or quality plan makes it useful; CDC does not impose a universal 3×–5× lens requirement. Open hinges and ratchets, examine serrations and lumens, and check cutting edges, corrosion, cracks, stiffness, and retained soil.

Return a soiled item to the contaminated cleaning area. Remove damaged instruments from service. Lubricate only when the instrument IFU directs it, using a water-soluble, sterilant-compatible product. Household oil or an unapproved lubricant can interfere with sterilant contact or damage the device.

Select a Compatible Sterile Barrier

Common systems include paper–plastic peel pouches, nonwoven wrap, and reusable rigid containers. Compatibility is not assumed:

• A pouch labeled for steam may not tolerate dry heat or chemical vapor.
• A wrap system may require a specific fold, tape, and load orientation.
• A rigid container needs the correct filter, valve, gasket, tray, and cycle.
• Sharp tips need protection that permits sterilant contact and does not puncture the barrier.

Use a package large enough to close without tension or crowding. There is no universal one-inch clearance rule for every pouch; follow the pouch manufacturer’s sizing and sealing directions. Arrange hinged items open and disassemble multi-part devices as their IFUs require.

Chemical Indicators

Place an internal chemical indicator in every package. If the internal indicator is not visible from the outside, use an external process indicator as well. The internal indicator goes in the area least accessible to the sterilizing agent as defined by the package or device IFU—not automatically the geometric center in every configuration.

CDC does not require a Type 4, 5, or 6 indicator in every dental pouch. Choose an indicator compatible with the sterilizer cycle and packaging. A Type 1 external indicator distinguishes processed from unprocessed packages; it does not prove that the cycle conditions reached the instrument. Any failed internal indicator means the package is not used until the cause is resolved and the item is reprocessed.

Seal and Label

Use the package’s integral seal or a validated heat sealer. Do not use staples, safety pins, or improvised tape that punctures the barrier. Inspect the full seal for channels, folds, contamination, or incomplete bonding.

Label only in the location and with the marker permitted by the packaging IFU. Some pouch manufacturers direct users to write on the plastic side outside the seal; others provide a printable paper margin. A universal “plastic side only” rule can conflict with the actual package. Avoid writing over the sterile field or using an ink that can bleed through.

The traceability system commonly records the sterilizer, cycle or load number, processing date, and—when the facility system requires it—the operator or expiration information. The label must let the practice identify affected packages during a sterilization failure or recall.

Load for Sterilant Contact

Move packaged items to the clean sterilizer-loading area. Load them using the sterilizer, rack, pouch, wrap, container, and device IFUs. Pouches may be placed on edge in a rack when specified, but paper-to-plastic orientation is not a universal rule for every chamber and rack. Do not stack or compress packages in a way that blocks air removal, sterilant contact, or drying. Keep packs from contacting surfaces when the sterilizer manufacturer prohibits it.

Run only a cycle validated for the device, packaging, and load. A correct exposure cycle paired with incompatible packaging is not a valid process.

Drying, Cooling, and Storage

Complete the sterilizer’s full drying cycle. Do not handle a wet package as sterile; moisture can weaken the barrier and create a pathway for contamination. Allow packages to cool in a clean area as the sterilizer and packaging IFUs direct before moving them into storage.

CDC supports event-related storage: package sterility is maintained until an event compromises it. This does not mean “indefinitely” regardless of all other requirements. Follow package labeling, manufacturer shelf-life information, facility policy, and applicable state rules. Inspect a package before use for moisture, tears, punctures, open seals, crushing, or other damage.

If integrity is compromised, do not tape the defect. Open the package, evaluate whether cleaning is needed, then place the item in new packaging with new indicators and run a complete compatible cycle. A manufactured sterile single-use device also follows its printed expiration date and storage labeling.

The exam sequence is: clean and inspect → package compatibly → place indicators → seal and label correctly → load per IFU → dry, cool, inspect, and store.