Table 2.

General clinical operation principles after outbreak

Stages	Soft-Opening Stage	Transition Stage	Normal Stage
Time period after clinic resumption	First 2 wk	Third week	Fourth week and after
Patient classification	No classifications All patients were treated with same clinical protocol	High-risk level patient: confirmed or suspected COVID-19 symptoms or contact history Ordinary patient: patients with no suspected COVID-19 symptoms and contact history Low-risk level patient: patients with no suspected COVID-19 symptoms and contact history and provided the negative nucleic acid test result within last 14 d	Same as transition stage
Clinical operation	Two operatories in 2 separate clinical bays with the principle of “one dentist-one dental assistant-one patient-in-one operatory”	50% Clinical operatories open Divided clinics into ordinary patient and low-risk patient bay areas	All clinical operatories were available Divided clinics into ordinary patient and low-risk patient bay areas
PPE∗	Enhanced grade 2 protection during first week (disposable hazmat suit required) Grade 2 protection can be used during second week	Grade 2 protection	Grade 2 protection
Treatment recommendations	1.Limited patient numbers 2.No aerosols-generating procedures	1.Gradually increased the numbers of patients. 2.Any aerosols-generating procedures involved with high-speed handpieces, ultrasonic instruments, and air-water syringes were allowed only for low-risk patients. 3.Only emergency treatments were provided to the high-risk level patient in special isolated rooms with grade 3 protection in a centralized location within the facility.	1.Resumed full clinical capacity. 2.Resumed full range of prosthodontics and implant treatment for both low-risk and ordinary patients. 3.Only emergency treatments were provided to the high-risk level patient in special isolated rooms with grade 3 protection in a centralized location within the facility.

PPE, personal protective equipment

^∗PPE grades information is provided in Table 1