The Autoclave Log Has a Five-Week Gap
A two-chair general practice has two autoclaves. The infection-control log shows that the last biological spore test was run five weeks ago. Staff have been using chemical indicator strips on each load and have written “pass” in the log. Yesterday, the spore test for Autoclave A came back positive. Autoclave A had been used for 14 patients over the previous three days. The practice wipes handpieces with alcohol between patients because “the autoclave is usually full.” The hygienist notices the positive result on the manager’s desk and sees that Autoclave A is still loaded with instruments for the afternoon. No one has told the 14 patients. The office has no written policy for positive spore tests.
1. Identify the infection-control breaches and explain why the chemical indicator strips are not sufficient.
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The practice has several breaches. Biological monitoring is the accepted method for verifying that a sterilizer actually kills spores; chemical indicator strips only show that the package was exposed to heat, steam, or a chemical process. They can change color even when the sterilizer is failing. A five-week gap in spore testing is not adequate monitoring; weekly biological monitoring is the standard expectation for active sterilizers. A positive spore test means Autoclave A must be removed from service until it is inspected, repaired if needed, and retested with biological indicators. Handpieces are semi-critical items because they contact oral tissues and can retract fluids; wiping with alcohol is not sterilization. They require heat sterilization between patients, with appropriate cleaning and lubrication. The practice also lacks a written positive-test policy, which is itself a safety and compliance gap.
2. What immediate actions should the hygienist and dentist take after the positive spore test?
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Immediately stop using Autoclave A and label it “out of service.” Do not process the afternoon load in that unit. Review the load records to identify which instruments were processed in Autoclave A since the last negative biological test, and reprocess those instruments in the functioning sterilizer if they have not been used. Instruments already used on patients cannot be recalled from the patient’s body, so the practice must assess exposure risk with the dentist and infection-control advisor. The autoclave should be inspected and repaired according to the manufacturer’s instructions, then retested with biological indicators, typically three consecutive negative tests before returning to service. Document all actions, including the dates, patients affected, and the advice received. The practice should also begin weekly spore testing for both units and maintain a log that staff actually review.
3. Should the 14 patients be notified, and what should the record show?
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Notification depends on whether the instruments were properly cleaned and packaged before the failed cycle and whether any patient had a recognized exposure. The dentist, not the hygienist alone, must make the risk assessment, preferably with the local health department or an infection-control expert. If instruments that were not sterile were used on patients, the practice should follow the advice received about notification, testing, and counseling. The record should document the positive spore test, the date the autoclave was removed from service, the loads and patients affected, the corrective actions, and the rationale for the notification decision. The hygienist should not reassure patients that “nothing happened” without a documented risk assessment. The practice should also correct the handpiece practice immediately and train staff on the written sterilization policy.