Application of recommended preventive measures against COVID-19 could help mitigate the risk of SARS-CoV-2 infection during dental practice: Results from a follow-up survey of French dentists

Background During the first-wave of the COVID-19 pandemic, dentists were considered at high-risk of infection. In France, to stop the spread of SARS-CoV-2, a nationwide lockdown was enforced, during which dentists suspended their routine clinical activities, working solely on dental emergencies. This measure has had an indisputable mitigating effect on the pandemic. To continue protecting dentists after suspension of nationwide lockdown, implementation of preventive measures was recommended, including adequate personal protective equipment (PPE) and room aeration between patients. No study has explored whether implementation of such preventive measures since the end of the first-wave has had an impact on the contamination of dentists. Methods An online survey was conducted within a French dentist population between July and September 2020. To explore risk factors associated with COVID-19, univariate and multivariate logistic regression analyses were performed. Results The results showed that COVID-19 prevalence among the 3497 respondents was 3.6%. Wearing surgical masks during non-aerosol generating procedures was a risk factor of COVID-19, whereas reducing the number of patients was a protective factor. Conclusions Considering the similar COVID-19 prevalence between dentists and the general population, such data suggest that dentists are not overexposed in their work environment when adequate preventive measures are applied. Impact Dentists should wear specific PPE (FFP2, FFP3 or (K)N95 masks) including during non-aerosol generating procedures and reduce the number of patients to allow proper implementation of disinfection and aeration procedures. Considering the similarities between COVID-19 and other viral respiratory infections, such preventive measures may also be of interest to limit emerging variants spread as well as seasonal viral outbreaks.

Comparison of Effects of N95 Respirators and Surgical Masks to Physiological and Psychological Health among Healthcare Workers: A Randomized Controlled Trial

Since the onset of the coronavirus disease 2019 pandemic, wearing facemasks has become more important for healthcare workers. This study aimed to investigate and compare the influence of wearing N95 respirators and surgical masks for 8 h on physiological and psychological health. Sixty-eight healthcare workers were randomly assigned to the N95 respirator or surgical mask groups. Physiological parameters of participants were measured by Tensor Tip MTX at baseline and at the 2nd, 4th, 6th and 8th h of wearing the facemasks. The symptoms after wearing facemasks were also determined via the questionnaire. There were no significant changes in physiological parameters at most time checkpoints in both groups. Significant differences were observed in terms of heart rate at the 8th h, time trends (adjusted difference of least squares means were −8.53 and −2.01), and interaction of time and mask type between the two groups (p-value for interaction was 0.0146). The values of these physiological parameters were within normal ranges. The N95 respirator group had significantly higher incidences of shortness of breath, headache, dizziness, difficulty talking and fatigue that spontaneously resolved. In conclusion, healthcare workers who wore either N95 respirators or surgical masks during an 8 h shift had no obvious harmful effects on physiological and psychological health. Additionally, the N95 respirator group did not show a higher risk than the surgical mask group.

Safe Contact Lens Practices during Coronavirus (COVID-19) Pandemic

World is threatened by different variants of Coronavirus to an extent that life has been jeopardized in all services including eye care facility. Contact lenses which are one of the preferred modes of vision correction are not an exception to COVID-19 infection. Recently there is confusion among practitioners and patients regarding the safety of contact lens use during COVID-19. This review article summarizes the current recommendations and findings regarding contact lens use during COVID-19. Though eye health professionals and contact lens users are at risk to contract Coronavirus, with proper care, maintenance and disinfection techniques, it would be safe to continue wearing contact lenses. There is currently no strong evidence to suggest that contact lenses are not safe to wear during COVID 19 times. Eye care practitioners responsible for contact lens application must wear special surgical masks, protective glasses or visors and disposable waterproof gloves. Regarding soft contact lenses, preferably daily disposable lenses should be used from the sterile packages. Similarly for rigid gas permeable lenses, lenses made up of fluoropolymer contained in sealed packages must be motivated for the individuals. Since the infected hands can bring the virus to the eyes, contact lens users should avoid touching the nose, mouth and eye unnecessarily. Contact lens after each use must be disinfected with hydrogen peroxide solutions with a special catalyst container. In the case of eye redness and Flu like symptoms, contact lens trial and wearing practices should be suspended or postpone till the condition becomes normal. To minimize the contact time between the patient and examiner soft copy of the instruction sheet, teleconsultation should be motivated. Though the eye is an unlikely site for Coronavirus infection, eye doctors should warn the contact lens wearers to follow scrupulous contact lens hygiene rules.

Filtration efficiency of face masks and veils as protective measures during COVID-19 pandemic

Wearing face masks have been implemented as a public and personal health control measure against the spread of coronavirus disease (COVID-19). However, the protection level of nonmedical face masks, such as women face veils, is still uncertain. This study aimed to assess the filtration efficiency (FE; percentage of particles retained by a mask) of different types of medical masks (either as sealed or unsealed, single or doubled), non-medical masks (cloth masks) and face veils. FE of face masks was evaluated using an in-house 3D-printed air duct connected to the Aerotrak particle counter with a capability of counting particle sizes of 0.3, 0.5, 0.7, 1, 2 and 5 μm. A set of 10 earloop surgical masks,10 tie-on surgical masks, 3 triple-layers reusable cloth masks and 3 types (short, medium and long) of traditional face veils were included in the study. The unsealed surgical masks showed intermediate FE (36.54-80.58%), with no observed differences between tie-on and earloop or single and doubled masks. For each mask type, the mean FE values of sealed surgical masks (FE≥99.16%) was significantly higher (P<0.001) than the unsealed ones (FE≤80.58%). No significant difference was observed in the mean FE values between unsealed surgical masks and either cloth masks (FE=23.19-75.35%, P=0.26) or face veils (FE=19.10- 70.68%, P=0.14). However, a mockup experiment showed that wearing a surgical mask under the face veil significantly improve the FE (33.73-79.18%; P<0.001). We conclude that besides sealed surgical masks that ensure optimal filtration under the experimental conditions, the unsealed surgical and cloth masks and face veils showed comparable performance and acceptable protection at 5 μm particle size, which is the most relevant particle size associated with COVID-19 infectious droplets. Wearing a surgical mask under the face veil significantly improves the FE compared to wearing a face veil alone.

Expatriates’ intention to send surgical masks to their native countries during the COVID-19 pandemic

The main purpose of this study is to gain a better understanding of the factors that determine behavioral intention of expatiates living in Taiwan to send surgical masks to their native country following the Covid-19 outbreak. To achieve this, the study builds a research model by extending Theory of Reasoned Action (TRA) with Knowledge-Attitude-Behavior (KAB) and Risk perception conceptions, incorporating Covid-19 related factors such as knowledge, fear, and risk perception and situational factors such as perceived mask scarcity. An online questionnaire was administered with 83 respondents participating. A partial least squares structural equation modeling (PLS-SEM) analysis was used to evaluate the collected data. We found that no significant relationship between both Covid-19 risk perception, and fear and expatiates’ attitudes to send surgical masks back home. Results further reveal that Covid-19 knowledge is the only factor that significantly influence expatriates’ attitudes, which in turn impact their on the intention to send surgical masks to their native countries. Perceived mask scarcity found to positively moderate relationship between attitude and intention. This study contributes to the growing body of literature and research focused on the Covid-19 pandemic, and offers some implications for future research on the correlations between knowledge and scarcity in the context of the theory of reasoned action. Although the current study examines a contemporary critical issue, it presents a key example of personal protective equipment (PPE).