Aerosol Generation in Endodontics

Every phase of the endodontic procedure generates aerosol to some degree. The combination of liquid irrigants, high-speed instrumentation, and ultrasonic energy creates a consistent aerosol environment within the operative field throughout the case.

• Irrigation delivery: NaOCl and EDTA delivered under pressure generate fine droplets and aerosol that travel upward from the operative field.
• Sonic and ultrasonic activation: the most significant source of aerosol generation in endodontics; activation dramatically increases droplet dispersal and extends the contamination zone.
• Rotary instrumentation: high-speed rotation within irrigant generates aerosol from the canal opening.
• Air drying: compressed air used to dry the canal before obturation disperses residual irrigant as fine aerosol.

The Aerosol Interface

The aerosol interface is the zone between the operative field and the objective lens of the operating microscope. In microscope-assisted endodontics, this interface is unavoidable — the microscope is positioned directly above the aerosol source, and the objective lens sits within the contamination zone for the duration of the procedure.

Fine aerosol particles remain airborne for extended periods and travel beyond the immediate operative field. Larger droplets reach the lens directly. Both contribute to progressive lens contamination that degrades visualization and requires mid-procedure cleaning.

Why Generic Barriers Are Insufficient

Generic plastic barriers are not designed for the geometry, working distance, or optical requirements of the dental operating microscope. They may cover the lens but compromise visualization, alter working distance, or fail to remain in position during the procedure. A barrier that requires repositioning mid-procedure introduces the same interruption it was intended to prevent.

Purpose-Designed Interface Management

ScopeShield is purpose-designed for the aerosol interface specific to microscope-assisted endodontics. It provides a fitted, optically compatible barrier at the point of highest contamination risk — the objective lens — without compromising visualization, working distance, or procedural access. It remains in position throughout the procedure without requiring adjustment.