Infection Risk Prediction Model for COVID-19 Based on an Analysis of the Settlement of Particles Generated during Dental Procedures in Dental Clinics

Figure 4

Filter paper placement per dental unit and delimitation of perimeter areas for particles dispersion analysis. Colored dash-dotted ovals delimit the five perimeter areas observed: perimeter area of the operator and patient, perimeter area of the assistant, perimeter area of the dental unit, accessory areas, and adjacent areas. Circled crosses indicate the placement of each plastic Petri dish within each perimeter area. For each procedure, 26 filter papers were located within the perimeter area of each dental unit in each clinic, except for Clinic 1, where 27 filter papers were placed. These add up to a total of 1256 samples.