A new study by French researchers looked at the noise associated with intraoral scanners given that there is “no normalized procedure to evaluate their basic performance and enable comparisons among intraoral scanners.” The researchers sought to develop a reproducible methodology for determining noise of an intraoral scanner.

The study compared the CS 3500 from Carestream Dental and 3Shape’s TRIOS intraoral scanner.

The researchers used an ultra-flat and ultra-smooth alumina wafer as its reference point. The wafer’s roughness was calculated using an AFM (atomic force microscope), while interferometric microscope measurements were used to validate its flatness. The researchers imaged the wafer with the two intraoral scanners from three different angles and two different directions.

The researchers found no statistically significant differences between the two intraoral scanners in terms of the RMS (root mean square), which was used to represent the noise. However, they did observe significant differences in angulation and orientation among the intraoral scanners.

The study appears in PLOS ONE.