Ambient light illuminance for Intraoral scanner may maximize scanning accuracy: Study

The purpose of this in vitro study was to evaluate the effect of ambient light illuminance on the accuracy and scanning time of different intraoral scanners (IOSs) in complete-arch implant scans. Seven IOSs (TRIOS 3, Primescan, Element 5D, i700, i500, CS3700, and CS3600) at 5 ambient lighting illuminances (100, 500, 1000, 5000, and 10 000 lux) were evaluated. An edentulous cast with 4 implants was selected as the master model. An implant scan body was tightened on each implant analog. The cast was digitized by using a laboratory scanner to obtain a reference standard tessellation language (STL) file, and 10 scans with each IOS were recorded. Scanning time was recorded by using a digital chronograph. Intraoral scan deviations were calculated by using a reverse engineering software program (Geomagic Control X). Kruskal-Wallis and pairwise comparison tests were used to analyze the data (α=.05).

The results of the study are:

• The trueness and precision values obtained for each IOS tested were significantly different under the varying lighting conditions assessed.

• TRIOS 3 (34.0 ±3.3 µm trueness; 24.5 ±14.9 µm precision), Element 5D (34.5 ±7.1 µm trueness; 25.9 ±7.6 µm precision), and CS3700 (34.9. ±13.0 µm trueness; 34.6 ±19.2 µm precision) performed better under 100 lux illumination, CS3600 (69.5 ±24.0 µm trueness; 36.6 ± 20.1 µm precision) at 500 lux; i500 (36.2 ±5.1 µm trueness; 21.4 ± 6.8 µm precision) at 1000 lux; i700 (34.8 ±2.2 µm trueness; 15.4 ±5.0 µm precision) at 5000 lux, and Primescan (37.4 ±37.3 µm trueness; 26.2 ± 26.2 µm precision) at 10000 lux.

• Additionally, the scanning time was different under different illuminance for each IOS.

• The fastest IOS in all light conditions was Primescan, with significant differences with all the groups (P<.01), followed by TRIOS 3 in all groups except under 100 lux illumination, where i700 was the second fastest.

Thus, ambient light influenced the accuracy and scanning time of IOSs assessed; however, the effect was not the same for all devices. It is necessary to optimize ambient light illuminance for each IOS to maximize scanning accuracy.

Reference:

Influence of ambient light conditions on the accuracy and scanning time of seven intraoral scanners in complete-arch implant scans by GastónOchoa-López et al. published in the Journal of Dentistry.

https://doi.org/10.1016/j.jdent.2022.104138