The non instrumentation technique (NIT), was introduced by Lussi et al., is a novel method of root canal debridement that uses the principle of controlled cavitation. The access cavity and root canal system are sealed off under reduced atmospheric pressure using specialized equipment. Rapidly alternating pressure fields (30-90 MPa, 25 Hz) are then generated, resulting in the production of macroscopic and microscopic cavitation bubbles (diameter, 5-50 μm) within the sodium hypochlorite irrigant . The vapor-filled bubbles then collapse, thereby creating hydrodynamic turbulence . Extrusion of irrigant is avoided because the pressure of the entire system is below atmospheric pressure . With a vacuum-filling method (using the same machine), the root canals can be dried and filled with a sealant . Nevertheless, NIT cannot enlarge the canal or remove the infected dentine.
REF: Hong Kong Dental Journal 2004;1: 52-7
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