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

Figure 9

Quantitative analysis of the stained area of settled particles generated during vestibular resin removal and etching, rinsing, and drying in anterior teeth. “Open”: procedures performed with open windows, and “closed”: procedures performed with closed windows. (a) Stained area of settled particles generated in the dental unit with inadequate ventilation (Clinic 6, Unit 2 in Figure 1) with a high-speed handpiece compared to the air/water syringe. (b) Stained area of settled particles generated in the dental unit with adequate ventilation (Clinic 6, Unit 1 in Figure 1) with a high-speed handpiece compared to the air/water syringe. (c) Percentage distribution of settled particles generated in the dental unit with inadequate ventilation (Clinic 6, Unit 2 in Figure 1). (d) Percentage distribution of settled particles generated for the air/water syringe in the dental unit with adequate ventilation (Clinic 6, Unit 1 in Figure 1).

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