CORONA H.C #دحاتم_البيطار #timodentist

REVIEW ARTICLE
Coronavirus Disease 19
(COVID-19): Implications for
Clinical Dental Care
ABSTRACT
The recent spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its
associated coronavirus disease has gripped the entire international community and caused
widespread public health concerns. Despite global efforts to contain the disease spread, the
outbreak is still on a rise because of the community spread pattern of this infection. This is a
zoonotic infection, similar to other coronavirus infections, that is believed to have originated in
bats and pangolins and later transmitted to humans. Once in the human body, this
coronavirus (SARS-CoV-2) is abundantly present in nasopharyngeal and salivary secretions of
affected patients, and its spread is predominantly thought to be respiratory droplet/contact in
nature. Dental professionals, including endodontists, may encounter patients with suspected
or confirmed SARS-CoV-2 infection and will have to act diligently not only to provide care but
at the same time prevent nosocomial spread of infection. Thus, the aim of this article is to
provide a brief overview of the epidemiology, symptoms, and routes of transmission of this
novel infection. In addition, specific recommendations for dental practice are suggested for
patient screening, infection control strategies, and patient management protocol. This review
was last updated on March 27, 2020. (J Endod 2020;46:584–595.)
KEY WORDS
Coronavirus; COVID-19; dental; endodontics; severe acute respiratory syndrome
coronavirus 2; SARS-CoV-2
The outbreak of coronavirus disease 2019 (COVID-19) in the area of Wuhan, China, has evolved rapidly
into a public health crisis1
and has spread exponentially to other parts of the world (Fig. 1)2
. The novel
coronavirus belongs to a family of single-stranded RNA viruses known as Coronaviridae3
. This family of
viruses are known to be zoonotic or transmitted from animals to humans. These include severe acute
respiratory syndrome coronavirus (SARS-CoV), first identified in 2002, and the Middle East respiratory
syndrome coronavirus (MERS-CoV), first identified in 20124
. There is strong evidence that this novel
coronavirus has similarity to coronavirus species found in bats and potentially pangolins, confirming the
zoonotic nature of this new cross-species viral-mediated disease5,6
. As the published genome sequence
for this novel coronavirus has a close resemblance with other beta-coronaviruses such as SARS-CoV
and MERS-CoV, the Coronavirus Study Group of the International Committee on Taxonomy of Viruses
has given it the scientific name SARS-CoV-2, even though it is popularly called the COVID-19 virus7,8
. On
January 30, 2020, the World Health Organization (WHO) declared the rampant spread of SARS-CoV-2
and its associated disease (COVID-19) a public health emergency with a currently known overall mortality
rate to be as high as 3.4%9,10
. According to the WHO situation report (March 27, 2020) update on
COVID-19, there have been more than 500,000 reported cases and 23000 deaths worldwide11
and this
number continues to increase (Fig. 1). Therefore, measures for prevention, identification, and
management must be in place for appropriate mitigation of further spread.
Given the widespread transmission of SARS-CoV-2 and reports of its spread to health care
providers4,12
, dental professionals are at high risk for nosocomial infection and can become potential
carriers of the disease. These risks can be attributed to the unique nature of dental interventions, which
include aerosol generation, handling of sharps, and proximity of the provider to the patient’s
oropharyngeal region. In addition, if adequate precautions are not taken, the dental office can potentially
expose patients to cross contamination. As the understanding of this novel disease is evolving, dental
SIGNIFICANCE
Dental care providers need to
be aware and prepared for
tackling any impending
infectious disease challenge as
might be the case in the
current outbreak of SARS-
CoV-2 transmission and its
associated coronavirus
disease, which can be life-
threatening to susceptible
patients.
From the Department of Endodontics,
University of Texas Health Science Center
at San Antonio, San Antonio, Texas
Address requests for reprints to Dr Amber
Ather, Department of Endodontics,
University of Texas Health Science Center
at San Antonio, 8210 Floyd Curl Drive,
San Antonio, TX 78229.
E-mail address: ather@livemail.uthscsa.
edu
0099-2399/$ - see front matter
Copyright © 2020 American Association
of Endodontists.
https://doi.org/10.1016/
j.joen.2020.03.008
Amber Ather, BDS, DDS,
Biraj Patel, BDS,
Nikita B. Ruparel, MS, DDS,
PhD, Anibal Diogenes, DDS, MS,
PhD, and
Kenneth M. Hargreaves, DDS,
PhD
584 Ather et al. JOE Volume 46, Number 5, May 2020

practices should be better prepared to identify
a possible COVID-19 infection, and refer
patients with suspected, confirmed, or a
history of COVID-19 infection to appropriate
treatment centers. In this article, we
summarize current recommendations for
diagnosing and managing patients with
COVID-19. Although this information is current
up to March 2020, we anticipate that new
information will emerge and have provided
URLs to several useful websites (Fig. 2).
SYMPTOMS
Patients with COVID-19 usually present with
clinical symptoms of fever, dry cough, and
myalgia. In addition, less obvious symptoms
such as nausea, diarrhea, reduced sense of
smell (hyposmia), and abnormal taste sensation
(dysguesia) have also been reported13
. In
addition, abnormal chest X-ray and computed
tomographic findings such as ground-glass
opacities are typically found in the chest14
.
Notably, about 80% of these patients have only
mild symptoms that resemble flulike symptoms
and seasonal allergies, which might lead to an
increased number of undiagnosed cases15
.
These asymptomatic patients can act as
“carriers” and also serve as reservoir for re-
emergence of infection. Although SARS-CoV-2
is known to be highly transmissible when
patients are most symptomatic, it is noteworthy
that the incubation period can range from 0 to
24 days, therefore transmission can occur
before any symptoms are apparent14,16
. Severe
forms of this disease have a predilection for men
with a mean age of 56 years with preexisting
chronic illnesses such as cardiovascular
disease or immunosuppression. The higher-risk
patient population manifests symptoms typical
of pneumonia or acute respiratory distress
syndrome14
.
ROUTES OF TRANSMISSION
SARS-CoV-2 infections typically spread
through respiratory droplets or by contact1
.
Therefore, coughing or sneezing by an
infected person can render SARS-CoV-2
airborne, potentially infecting individuals in
close contact (within a radius of
approximately 6 ft). This led to the recent
recommendation of social distancing to
minimize community spread of the disease.
Another important route of transmission is if
droplets of SARS-CoV-2 land on inanimate
objects located nearby an infected individual
and are subsequently touched by other
individuals1
. Thus, disinfection of objects and
handwashing are essential for halting the
spread of this disease. This recommendation
is strengthened considering that people touch
their face on an average of 23 times per hour,
with 44% of these occurrences involving the
mucous membranes of the mouth and/or
nose17
. In addition, studies have shown the
presence of SARS-CoV-2 in both saliva and
feces of the affected patients18,19
. It is known
that SARS-CoV-2 can bind to human
angiotensin-converting enzyme 2 receptors,
which are highly concentrated in salivary
glands; this may be a possible explanation for
the presence of SARS-CoV-2 in secretory
saliva20,21
. Therefore, there is a potential for
transmission of COVID-19 via aerosol,
fomites, or the fecal-oral route that may
contribute to nosocomial spread in the dental
office setting22
.
PATIENT MANAGEMENT AND
PREVENTION OF NOSOCOMIAL
INFECTION
Based on the experience gained from the
previous outbreak of SARS-CoV and the data
available on SARS-CoV-2 and its associated
disease (COVID-19), certain specific measures
are discussed for dental patient management
in this epidemic period of COVID-19
(summarized in Fig. 3).
Telescreening and Triaging
Initial screening via telephone to identify
patients with suspected or possible COVID-
19 infection can be performed remotely at the
time of scheduling appointments (Fig. 3). The
3 most pertinent questions for initial
screening should include any exposure to a
person with known or suspected COVID-19
presentation, any recent travel history to an
area with high incidence of COVID-19 or
presence of any symptoms of febrile
respiratory illness such as fever or cough.
Importantly, to identify high-risk areas, live
global tracking of reported cases can be
done using the dashboard made accessible
by the Center for Systems Science and
Engineering at Johns Hopkins University 2
.
Figure 1 represents a screenshot of
interactive tracking of COVID-19.
A positive response to either of the 3
questions should raise initial concern, and
elective dental care should be deferred for at
least 2 weeks (Note: As mentioned previously,
the incubation period for SARS-CoV-2 can
range from 0–24 days). These patients should
be encouraged to engage in self-quarantine
FIGURE 1 – A screenshot of an interactive map of the global cases of COVID-19 by the Center for Systems Science and Engineering at Johns Hopkins University2
. This dashboard is
continually updated and can be accessed at https://coronavirus.jhu.edu/map.html. Site accessed April 9, 2020.
JOE Volume 46, Number 5, May 2020 COVID-19 and Clinical Dental Care 585

and contact their primary care physician by
telephone or email23
.
Patient Evaluation and Cohorting
Upon patient arrival in dental practice,
patients should complete a detailed medical
history form, COVID-19 screening
questionnaire and assesment of a true
emergency questionnaire (Figs. 4 and Fig. 5).
Dental professionals should measure the
patient’s body temperature using a non-
contact forehead thermometer or with
cameras having infrared thermal sensors22
.
Patients who present with fever (.100.4
F
5 38
C) and/or respiratory disease
symptoms should have elective dental care
deferred for at least 2 weeks. As per the
Centers for Disease Control and Prevention
guidelines, individuals with suspected
COVID-19 infection should be seated in a
separate, well-ventilated waiting area at least
6 ft from unaffected patients seeking care24
.
Patients should be requested to wear a
surgical mask and follow proper respiratory
hygiene, such as covering the mouth and
nose with a tissue before coughing and
sneezing and then discarding the tissue24
.
After informing the patients to self-quarantine
themselves, dentists should instruct the
patients to contact their physician to rule out
the possibility of COVID-19.
Pharmacologic Management
In suspected or conﬁrmed cases of COVID-
19 infections requiring urgent dental care for
conditions such as tooth pain and/or
swelling, pharmacologic management in the
form of antibiotics and/or analgesics is an
alternative. This approach may offer
Online Resources for COVID-19
Latest updates about Corona virus disease-2019
hƩps://www.who.int/emergencies/diseases/novel-coronavirus-2019
Clinical resource on COVID-19 outbreak
hƩps://www.nejm.org/coronavirus
Open source health and medical research on the novel coronavirus (SARS-CoV-2) and COVID-19
hƩps://www.elsevier.com/connect/coronavirus-informaƟon-center
Routes of transmission of COVID-19
hƩps://www.cdc.gov/coronavirus/2019-ncov/about/transmission.html
RecommendaƟons for puƫng on and removing personal protecƟve equipment
hƩps://www.cdc.gov/hai/pdfs/ppe/ppe-sequence.pdf
Interim infecƟon control recommendaƟons (Includes details on protecƟve equipment, hand hygiene pracƟces and
negaƟve pressure rooms)
hƩps://www.cdc.gov/coronavirus/2019-ncov/infecƟon-control/control-recommendaƟons.html
RecommendaƟons on N95 respirators use and reuse
hƩps://www.cdc.gov/niosh/topics/hcwcontrols/recommendedguidanceextuse.html
Steps for Healthcare FaciliƟes to prepare for COVID-19
hƩps://www.cdc.gov/coronavirus/2019-ncov/healthcare-faciliƟes/steps-to-prepare.html
Risk Assessment and Public Health Management of Persons with PotenƟal COVID-19 exposure
hƩps://www.cdc.gov/coronavirus/2019-ncov/php/risk-assessment.html
Live-tracking of reported cases
hƩps://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6
Environmental protecƟon agency approved COVID-19 chemical disinfectants
hƩps://www.epa.gov/pesƟcide-registraƟon/list-n-disinfectants-use-against-sars-cov-2
American Dental AssociaƟon (ADA) Coronavirus Center for DenƟsts
hƩps://success.ada.org/en/pracƟce-management/paƟents/infecƟous-diseases-2019-novel-coronavirus
Interim InfecƟon PrevenƟon and Control Guidance for Dental Seƫngs During the COVID-19
Response
hƩps://www.cdc.gov/coronavirus/2019-ncov/hcp/dental-seƫngs.html
ADA guidance on dental emergency and non-emergency care
hƩps://www.ada.org/en/publicaƟons/ada-news/2020-archive/march/ada-develops-guidance-on-dental-
emergency-nonemergency-care
FIGURE 2 – A list of online resources for COVID-19.

symptomatic relief and will provide dentists
sufﬁcient time to either refer the patient to a
specialist or deliver dental care with all
appropriate measures in place to prevent the
spread of infection.
SPECIFIC DENTAL TREATMENT
RECOMMENDATIONS
Patients with active febrile and respiratory
illness will most likely not present to dental
practices. Based on the assessment of
emergency questionnaire (Fig. 5), clinicians
can gauge the severity of the dental condition
and make an informed decision to either
provide or defer dental care. In order to have a
clarity on what constitutes an emergency
condition, dentists can refer to recent
American Dental Association
recommendations (Fig. 2). Certain instances
such as dentoalveolar trauma and progressive
fascial space infection warrant emergency
dental intervention. In the unlikely event of
providing dental care to suspected or
conﬁrmed cases of COVID-19 infection,
dentists should be cognizant of the following
recommendations:
Dentists should follow standard, contact,
and airborne precautions including the
appropriate use of personal protective
equipment and hand hygiene practices24
.
Figure 6 illustrates Centers for Disease
FIGURE 3 – An overview of patient screening for COVID-19 and dental management.
FIGURE 4 – COVID-19 screening questionnaire.

Assessment of a True Emergency
(Circle Patient’s Response wherever appropriate)
1) Are you in pain?
Yes or No
2) What is your level of pain on a scale of 0-10?
3) When did the pain begin?
…………………………………….
4) Do you have a dental abscess (Are your gums and/or face swollen?)
Yes or No
If Yes, when did you first notice the swelling?
…………………………………….
5) Do you have a fever?
Yes or No
6) Are you having any trouble swallowing?
Yes or No
7) Are you having any trouble opening your mouth?
Yes or No
8) Did you experience any trauma?
Yes or No
Please describe the trauma
…………………………………….
•
•
FIGURE 5 – Assessment of a true emergency questionnaire.

Control and Prevention guidelines for
putting on and removing personal
protective equipment. Due to the
uncertainity of this outbreak, there might
be a shortage of personal protective
equipment. Therefore, it is advisable to
use them judiciously and follow the
Centers for Disease Control and
Prevention guidelines for N95 respirator
use and reuse (Fig. 2).
Preprocedural mouth rinse: previous
studies have shown that SARS-CoV and
MERS-CoV were highly susceptible to
povidone mouth rinse25
. Therefore,
preprocedural mouth rinse with 0.2%
povidone-iodine might reduce the load of
corona viruses in saliva22,26
. Another
alternative would be to use 0.5-1%
hydrogen peroxide mouth rinse, as it has
non speciﬁc virucidal activity against corona
viruses27
.
SEQUENCE FOR PUTTING ON
PERSONAL PROTECTIVE EQUIPMENT (PPE)
CS250672-E
The type of PPE used will vary based on the level of precautions required, such as standard and contact, droplet or
airborne infection isolation precautions. The procedure for putting on and removing PPE should be tailored to the
type of PPE.
1. GOWN
• Fully cover torso from neck to knees, arms
to end of wrists, and wrap around the back
• Fasten in back of neck and waist
2. MASK OR RESPIRATOR
• Secure ties or elastic bands at middle
of head and neck
• Fit band to nose bridge
• Fit snug to face and below chin
• Fit-check respirator
3. GOGGLES OR FACE SHIELD
• Place over face and eyes and adjust to
4. GLOVES
• Extend to cover wrist of isolation gown
USE SAFE WORK PRACTICESTO PROTECTYOURSELF
AND LIMITTHE SPREAD OF CONTAMINATION
• Keep hands away from face
• Limit surfaces touched
• Change gloves when torn or heavily contaminated
• Perform hand hygiene
FIGURE 6 – Centers for Disease Control and Prevention recommendations for putting on and removing personal protective equipment for treating COVID-19 patients. From: https://
www.cdc.gov/hai/pdfs/ppe/ppe-sequence.pdf. Site accessed March 17, 2020.

Use of disposable (single-use) devices such
as mouth mirror, syringes, and blood
pressure cuff to prevent cross contamination
is encouraged.
Radiographs: extraoral imaging such as
panoramic radiography or cone-beam
computed tomographic imaging should
be used to avoid gag or cough reﬂex
that may occur with intraoral imaging.
When intraoral imaging is mandated,
sensors should be double barriered to
prevent perforation and cross
contamination28
.
Dentists should use a rubber dam to
minimize splatter generation (of course, this
is the standard of care for nonsurgical
endodontic treatment). It may be
advantageous to place the rubber dam so
that it covers the nose.
Dentists should minimize the use of
ultrasonic instruments, high-speed
handpieces, and 3-way syringes to reduce
the risk of generating contaminated
aerosols.
HOWTO SAFELY REMOVE PERSONAL PROTECTIVE EQUIPMENT (PPE)
EXAMPLE 1
There are a variety of ways to safely remove PPE without contaminating your clothing, skin, or mucous membranes with
potentially infectious materials. Here is one example. Remove all PPE before exiting the patient room except a respirator, if
worn. Remove the respirator after leaving the patient room and closing the door. Remove PPE in the following sequence:
1. GLOVES
• Outside of gloves are contaminated!
• If your hands get contaminated during glove removal, immediately
wash your hands or use an alcohol-based hand sanitizer
• Using a gloved hand, grasp the palm area of the other gloved hand
and peel off glove
• Hold removed glove in gloved hand
• Slide of ungloved hand under remaining glove at wrist and
peel off second glove over glove
• Discard gloves in a waste container
• Outside of goggles or face shield are contaminated!
• If your hands get contaminated during goggle or face shield removal,
immediately wash your hands or use an alcohol-based hand sanitizer
• Remove goggles or face shield from the back by lifting head band or
ear pieces
• If the item is reusable, place in designated receptacle for
reprocessing. Otherwise, discard in a waste container
3. GOWN
• Gown front and sleeves are contaminated!
• If your hands get contaminated during gown removal, immediately
wash your hands or use an alcohol-based hand sanitizer
• Unfasten gown ties, taking care that sleeves don’t contact your body
when reaching for ties
• Pull gown away from neck and shoulders, touching inside of gown only
• Turn gown inside out
• Fold or roll into a bundle and discard in a waste container
• Front of mask/respirator is contaminated — DO NOT TOUCH!
• If your hands get contaminated during mask/respirator removal,
• Grasp bottom ties or elastics of the mask/respirator, then the ones at
the top, and remove without touching the front
• Discard in a waste container
CS250672-E
OR
5. WASH HANDS OR USE AN
ALCOHOL-BASED HAND SANITIZER
IMMEDIATELY AFTER REMOVING
ALL PPE
PERFORM HAND HYGIENE BETWEEN STEPS IF HANDS
BECOME CONTAMINATED AND IMMEDIATELY AFTER
REMOVING ALL PPE
FIGURE 6 – (Continued )

In this time of public health crisis,
endodontic practices can dilute the sodium
hypochlorite irrigant solution to 1%
concentration, to extend the supplies
without compromising on treatment
outcome29
.
Negative-pressure treatment rooms/
airborne infection isolation rooms (AIIRs): it
is worth noting that patients with suspected
or conﬁrmed COVID-19 infection should
not be treated in a routine dental practice
setting. Instead, this subset of patients
should only be treated in negative-pressure
rooms or AIIRs. Therefore, anticipatory
knowledge of health care centers with
provision for AIIRs would help dentists to
provide emergent dental care if the need
arises24
.
SARS CoV-2 can remain viable in aerosol
and survive up to 3 days on inanimate
surfaces at room temperature, with a
greater preference for humid
conditions30
. Therefore, clinic staff should
make sure to disinfect inanimate surfaces
HOWTO SAFELY REMOVE PERSONAL PROTECTIVE EQUIPMENT (PPE)
EXAMPLE 2
Here is another way to safely remove PPE without contaminating your clothing, skin, or mucous membranes with potentially
infectious materials. Remove all PPE before exiting the patient room except a respirator, if worn. Remove the respirator after
leaving the patient room and closing the door. Remove PPE in the following sequence:
1. GOWN AND GLOVES
• Gown front and sleeves and the outside of gloves are
contaminated!
• If your hands get contaminated during gown or glove removal,
immediately wash your hands or use an alcohol-based hand
sanitizer
• Grasp the gown in the front and pull away from your body so
that the ties break, touching outside of gown only with gloved
hands
• While removing the gown, fold or roll the gown inside-out into
a bundle
• As you are removing the gown, peel off your gloves at the
same time, only touching the inside of the gloves and gown
with your bare hands. Place the gown and gloves into a waste
container
CS250672-E
A B
D E
C
• Outside of goggles or face shield are contaminated!
• If your hands get contaminated during goggle or face shield removal,
• Remove goggles or face shield from the back by lifting head band and
without touching the front of the goggles or face shield
• If the item is reusable, place in designated receptacle for
reprocessing. Otherwise, discard in a waste container
• Front of mask/respirator is contaminated — DO NOT TOUCH!
• If your hands get contaminated during mask/respirator removal,
• Grasp bottom ties or elastics of the mask/respirator, then the ones at
the top, and remove without touching the front
• Discard in a waste container
OR
4. WASH HANDS OR USE AN
ALCOHOL-BASED HAND SANITIZER
IMMEDIATELY AFTER REMOVING
ALL PPE
PERFORM HAND HYGIENE BETWEEN STEPS IF HANDS
BECOME CONTAMINATED AND IMMEDIATELY AFTER
REMOVING ALL PPE
FIGURE 6 – (Continued )

using chemicals recently approved for
COVID-19 and maintain a dry
environment to curb the spread of
SARS-CoV-231
.
DISCUSSION
The rampant spread of SARS-CoV-2
worldwide increases the likelihood that
dental health care professionals will treat
this subset of the patient population.
Universal precautions are crucial to
minimize the spread of this virus and its
associated disease. As presented in this
review, further precautions are necessary
that includes careful prescreening of
patients and additional measures if
treatment of patients with conﬁrmed
COVID-19 is deemed necessary. The latest
update (March 16, 2020) by the American
Dental Association recommends dentists
nationwide to defer elective dental
treatment for the next three weeks and
focus on emergency care32
. As there is a
surge in the number of COVID-19 cases, it
is quite possible that this deferment might
be extended. Therefore, in order to help
dentists during this period, we have put
together a set of recommendations for
management of dental emergencies
(Fig. 7)33-43
. It is advisable to assess the
emergencies on a case-by-case basis and
use clinical judgement to aid in decision
making.
Endodontists are in a unique situation as
they may be called upon for the assessment
and management of odontogenic pain,
swelling, and dental alveolar trauma in
suspected or known COVID-19 patients. It is
worth noting that case presentations can be
dynamic, and thereisa goodchancethatdental
practices might treat some of the patients with
asymptomatic COVID-19 infections since the
incubation period can range from 0 to 24 days
and most patients only develop mild
symptoms14,16
. Thus, every patient should be
considered as potentially infected by this virus,
and all dental practices need to review their
infection control policies, engineering controls,
and supplies. Health care providers must keep
themselves up-to-date about this evolving
disease and provide adequate training to their
staff to promote many levels of screening and
preventive measures, allowing dental care to be
provided while mitigating the spread of this
novel infection.
In conclusion, health care
professionals have the duty to protect the
public and maintain high standards of care
and infection control. This new emerging
SARS-CoV-2 threat could become a less
FIGURE 7 – Recommendations for dental emergency management during COVID-19 outbreak.

pathogenic and more common infection in
the worldwide population. Indeed, it is
predicted to persist in our population as a
less virulent infection with milder
symptoms, if it follows the same
evolutionary pattern of the other
coronavirus infections (ie, SARS-CoV and
MERS-CoV). Thus, it is important to make
informed clinical decisions and educate the
public to prevent panic while promoting the
health and well-being of our patients during
these challenging times. The prudent
practitioner will use this review as a starting
point and continue to update themselves
with useful online information as this
outbreak continues (Fig. 2).
ACKNOWLEDGMENTS
The authors deny any conflicts of interest
related to this study.
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