The Challenge
During Performance Qualification, SVA observed inconsistent water flow through the internal channels of dental handpieces during automated cleaning.
The handpieces were being connected to the washer-disinfector using specialised silicone ring irrigators. While these provided a connection between the handpiece and the washer irrigation system, observations during PQ indicated that consistent internal flow was not being achieved.
For devices with internal channels, effective cleaning relies not only on the external surfaces being exposed to the cleaning process, but also on water and cleaning chemistry being delivered effectively through the internal pathways of the device.
Developing a Practical Solution
SVA worked with the health service organisation to investigate how the existing washer configuration could be improved.
Rather than replacing the cleaning system, the team developed a conversion solution for the existing MIS dental cleaning manifolds, replacing the traditional silicone ring irrigators with fit-for-purpose dental handpiece connectors.
The modified arrangement provided a more direct and reliable connection between the washer irrigation system and the internal channels of the handpieces.
Assessing the Improvement
Following the modification, SVA observed significantly improved water and cleaning chemistry flow through the internal channels of the dental handpieces.
The new connectors also provided an unexpected operational benefit. Handpieces were easier to mount and remove than with the previous silicone ring arrangement, improving handling for staff as well as the delivery of the cleaning process.
The Outcome
The investigation demonstrated the value of Performance Qualification in assessing how reusable medical devices are actually processed, rather than considering the functionality of the washer-disinfector in isolation.
For complex devices such as dental handpieces, connections between the device and the washer can be just as important as the washer cycle itself. If water and cleaning chemistry cannot reliably reach all surfaces that need to be cleaned (internal as well as external), completion of an automated cycle alone does not demonstrate effective internal cleaning.
How SVA helped
SVA combined specialist reprocessing knowledge, practical experience and Performance Qualification testing to identify inconsistent internal cleaning of dental handpieces and investigate how the existing process could be improved. Working collaboratively with the facility, SVA helped develop and verify a practical modification that improved internal irrigation and cleaning performance, while also making the system easier for staff to use.
This case study illustrates circumstances encountered during a specific project. Findings and outcomes are specific to the circumstances described and may not be applicable to other equipment, processes or facilities.
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Copyright © 2026 Process Validation & Design Pty Ltd T/As Sterilizer Validation Australia [SVA]. All rights reserved.
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