Dental and Medical Problems

Dent Med Probl
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Dental and Medical Problems

2022, vol. 59, nr 3, July-September, p. 343–350

doi: 10.17219/dmp/150075

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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Daltaban Ö, Aytekin Z. Fear and anxiety of COVID‐19 in dental patients during the COVID‐19 pandemic: A cross-sectional survey in Turkey. Dent Med Probl. 2022;59(3):343–350. doi:10.17219/ dmp/150075

Fear and anxiety of COVID-19 in dental patients during the COVID-19 pandemic: A cross-sectional survey in Turkey

Özlem Daltaban1,C,D,E,F, Zeliha Aytekin1,A,B,D,E,F

1 Department of Periodontology, Faculty of Dentistry, Akdeniz University, Antalya, Turkey


Background. The significant risk of cross-infection in dental practice has caused indecision among dental patients about whether to attend dental appointments. The coronavirus disease 2019 (COVID-19) pandemic has had a significant psychological impact on dental patients.

Objectives. The aim of this study was to evaluate the levels of and the associated factors for fear and anxiety among dental patients during the COVID-19 pandemic in Turkey.

Material and methods. A cross-sectional questionnaire-based survey consisting of 6 parts was conducted. The 6 parts were sociodemographic data, knowledge about COVID-19, information sources, the perception of COVID-19, the fear of COVID-19 scale (FCoV-19S), and the generalized anxiety disorder-7 scale (GAD-7).total of 301 participants completed the survey.

Results. As many as 81% of the participants perceived COVID-19 asserious disease, and 73% reported the fear of visiting their dental clinic due to the possibility of being infected with COVID-19. The participants’ knowledge about COVID-19 was significantly correlated with gender, the educational status and the use of the Internet. There wasstrong negative correlation between the participants’ levels of know­ledge and the FCoV-19S and GAD-7 scores.significant positive correlation was observed between the FCoV-19S score and the GAD-7 score. In regression analysis, being female, perceiving COVID-19 asserious disease, being afraid of going to the dentist, havinglow knowledge score, and havinghigh GAD-7 score were the predictors of a high FCoV-19S score.

Conclusions. This study determined that the COVID-19 pandemic had had significant psychological effects on dental patients in Turkey. The results also underline the importance of providing more educational information to the public about the strict infection control measures taken by dental clinics against COVID-19 transmission in order to eliminate misperception.

Keywords: anxiety, fear, COVID-19 pandemic, coronavirus disease 2019 (COVID-19), dental patient


Coronavirus disease 2019 (COVID-19) was initially identified in Wuhan, China, in December 2019 and it spread around the world. The World Health Organization (WHO) declared COVID-19 a pandemic on March 11, 2020.1

The COVID-19 pandemic rapidly changed social relationships, health conditions and the routine of people’s daily lives.2 In response to the pandemic, governments introduced various measures to prevent the transmission of the disease, including social distancing, self-isolation and quarantine orders. Due to the prolonged lockdown and COVID-19-associated fear,large proportion of the population experienced frustration, stress and irritability.3, 4 Studies have reported that the percentage of people with anxiety, depression, fear, and sleep problems increased during the COVID-19 pandemic.5, 6, 7, 8, 9

The risk of cross-infection in dental practice has been demonstrated to be remarkably high because of close physical contact between dental patients and professionals, as well as the production of aerosol during dental procedures.10 Professional dental associations around the world have published recommendations and guidelines dental clinics should follow during the pandemic.11 Changes in health-seeking behaviors have been reported during the COVID-19 pandemic.12 In such an uncertain situation, patients may remain undecided about their dental appointments. Previous reports have documented that the fear of COVID-19 contributes to delays in accessing healthcare.13, 14 The delivery of dental services globally has been severely disrupted during the COVID-19 pandemic.15 Patients’ concern and fear are related to the possibility of contracting the infection and transmitting the disease to their families. All of these factors may increase the psychological stress in dental patients.

Many studies have evaluated depressive symptoms in individuals from different segments of society during the COVID-19 pandemic, such as dental practitioners, the hospital staff and students.16, 17, 18, 19, 20 However, few stu­dies have investigated dental patients’ perception and mental status regarding dental visits during pandemics.14, 21, 22study conducted during the severe acute respiratory syndrome (SARS) epidemic in Hong Kong reported that 2/3 of dental patients were worried about getting infected during dental procedures, and thus avoided dental care.21 Another study conducted during the Middle East respiratory syndrome (MERS) outbreak showed that 26% of dental patients expressed concern regarding attending dental appointments due to the fear of contracting the disease.22

Since regular dental care iscritical factor in ensuring and maintaining adequate dental and periodontal health,better understanding of a patient’s psycho­logical state and perception during the COVID-19 pandemic would help us develop strategies for optimal dental practices. Therefore, the aim of this study was to evaluate the know­ledge status and perception regarding COVID-19, and to determine the fear and anxiety levels of dental patients in Turkey during the pandemic.

Material and methods

Study design

This cross-sectional study was approved by the Ethics Committee at the Faculty of Medicine of Akdeniz University, Antalya, Turkey (No. of approval: 70904504/706), and conducted in accordance with the Declaration of Helsinki. The study followed the STrengthening the Reporting of OBservational studies in Epidemiology (STROBE) guidelines.23

Data was collected from the dental patients of the Akdeniz University Faculty of Dentistry between September 23 and October 23, 2020, after dental clinics were reopened to the public in Turkey. The inclusion criteria for participation were as follows: willingness to participate and provide informed consent; age of 18 years or above; and the ability to understand, read and write in the Turkish language. Individuals who did not consent to participate in the survey, patients who were under the age of 18 years and foreign patients who could not communicate in Turkish were excluded from the study.

The questionnaire (paper-based survey) was structured into 6 domains: general sociodemographic data (Appendix 1); knowledge about COVID-19 (Appendix 2); COVID-19 information sources (Appendix 3); the perception of COVID-19 (Appendix 4); the fear of COVID-19 scale (FCoV-19S)24 (Appendix 5); and the generalized anxiety disorder-7 scale (GAD-7)25 (Appendix 6) (The questionnaires as Appendices are available from the corresponding author on reasonable request.).


Level of knowledge about COVID-19

Based on the information gathered from the published literature,26 the questions asked to assess the participants’ level of knowledge about COVID-19 regarded the transmission routes, prevention and clinical symptoms of COVID-19. Two questions were answered as either ‘true’ or ‘false’, and the remaining 2 were multiple-choice questions. Each correct answer scored 1 and the knowledge scores were calculated by summing the number of correct answers. The total knowledge score ranged from 0 to 10. Due to the lack of a standardized tool in the literature, the participants with an overall score >50% were considered knowledgeable. The Cronbach’s alpha coefficient of the knowledge questionnaire was α = 0.78.

Perception of COVID-19

Perception was assessed through the following 2 questions: “Is COVID-19 a serious disease?”; and “Are you afraid to visit the dental clinic due to the possibi­lity of contagion with COVID-19?”. Similar questions have been used in previous studies.27, 28

Fear of COVID-19 scale

The participants’ fear levels were measured with the Turkish validated version of the FCoV-19S.29 This scale is reliable and valid for determining the fear of COVID-19 in the general population. It isunidimensional scale with 7 questions. The score for each question is rated on5-point Likert-type scale ranging from ‘strongly disagree’ (1) to ‘strongly agree’ (5). To obtain the FCoV-19S score, all items were summed; the total score ranged from 7 to 35. The higher the score, the greater the level of fear of COVID-19. The internal consistency of the Turkish version of the scale was found to be 0.84.29 The Cronbach’s alpha value of this scale was found to be α = 0.80.

Generalized anxiety disorder-7 scale

The participants’ anxiety levels were evaluated using the Turkish version of GAD-7. The GAD-7 is7-item and 4-point Likert-type scale (0 – not at all; 1 – several days; 2 – more than half of the days; and 3 – almost every day) developed by Spitzer et al. that is used for the diagnosis, monitoring and assessing the severity of anxiety disorders.25 The total score was calculated and the anxiety levels were classified into 4 categories (minimal: 0–4; mild: 5–9; moderate: 10–14; and severe: 15–21).25 The GAD-7 was first adapted into the Turkish language by Konkan et al., and the Cronbach’s alpha value was α = 0.85.30 The Cronbach’s alpha value for the present scale was found to be α = 0.84.

Statistical analysis

Descriptive values, including median (Me), mean and standard deviation (M ±SD), and absolute and relative frequencies (n (%)), were calculated to examine the participants’ characteristics. The normality of quantitative data was determined using the Kolmogorov–Smirnov test. The χ2 test was used to determine differences between categorical variables. Differences between continuous variables were examined using the Mann–Whitney U test. Correlations were determined using Spearman’s rank correlation coefficient (r). Linear regression analysis was performed to predict the potential influencing factors related to the fear of COVID-19. The regression coefficient (β) and 95% confidence interval (CI) were reported. All calculations were considered statistically significant at p < 0.05. All statistical analyses were performed using IBM SPSS Statistics for Windows, v. 23.0 (IBM Corp., Armonk, USA).


Participants’ sociodemographic data

A total of 301 participants completed the questionnaire (117 males and 184 females). The demographic data of the participants are summarized in Table 1.

COVID-19 knowledge

The mean COVID-19 knowledge score was 7.66 ±2.04 (Me: 8; range: 0–10). Eighty-seven percent of the study participants had sufficient COVID-19 knowledge. Significant differences were observed in the disease knowledge scores according to gender, where males had higher scores than females (p < 0.05), and the educational status, where participants that heldmaster’s degree had higher scores than those who did not (p = 0.001). Furthermore, highly educated respondents (i.e., university education,master’s degree or Ph.D.) had higher knowledge scores than participants with only primary or high school education (p < 0.001). Among the studied demographic characteristics, gender (r = 0.123; p < 0.05) and the educational status (r = 0.207; p < 0.001) were significantly correlated with the mean knowledge scores. Furthermore, there waspositive correlation between the COVID-19 knowledge score and use of the Internet (r = 0.133; p < 0.05).

COVID-19 perception

Regarding the attitude of the participants toward COVID-19, 81% perceived COVID-19 asserious disease. Moreover, 73% of the participants (among them, males: n = 76, 35%; females: n = 143, 65%) were afraid of going to the dental clinic due to the possibility of contracting COVID-19.

COVID-19 information sources

The source of information about COVID-19 was primarily television (n = 231, 77%), the Internet (n = 206, 68%; the official website of the Turkish Ministry of Health – 89%) and social media (n = 168, 56%). Among the social media resources, 38% of the participants used Twitter, 30% used Instagram, 25% used Facebook, and 7% used WhatsApp.

Fear of COVID-19

The mean FCoV-19S score of the participants was 18.10 ±5.64 (Me: 18; range: 7–35). The highest mean FCoV-19S scores referred to items “I am most afraid of COVID-19” and “It makes me uncomfortable to think about COVID-19”, with values of 3.56 ±1.24 and 3.38 ±1.32, respectively. The lowest mean FCoV-19S score was observed for item “I cannot sleep, because I am worrying about getting COVID-19”, with a value of 1.71 ±0.99 (Table 2). The fear scores of females were significantly higher than those of males (p = 0.028). However, age, the marital status, having children, the employment status, the educational status, the region of residence, and hav­ing a systemic disease did not significantly affect the total FCoV-19S score (p > 0.05). There was a strong negative cor­relation between the FCoV-19S score and the COVID-19 knowledge level (r = −0.808; p < 0.001) (Table 3). There was no significant correlation between the FCoV-19S score and the sources of information (p > 0.05).

Participants who considered the disease to be serious had significantly higher FCoV-19S scores (18.80 ±5.65) than those who considered the disease not to be serious (15.40 ±4.06) (p = 0.032). Similarly, participants who were afraid to visit the dental clinic due to the possibility of getting infected with COVID-19 had significantly higher FCoV-19S scores (19.66 ±5.48) than those who were not afraid to visit the dental clinic (13.91 ±4.87) (p = 0.040). This fear was significantly higher in females than in males (p = 0.017).

Multiple linear regression analysis showed that being female (β = 0.880, 95% CI: 0.016 to 0.275; p = 0.028), havinglow total knowledge score (β = –0.510, 95% CI: −0.935 to −0.680; p = 0.000), perceiving COVID-19 asserious disease (β = 0.114, 95% CI: 0.058 to 0.328; p = 0.005), being afraid of attendingdental visit (β = 0.359, 95% CI: 0.504 to 0.792; p = 0.000), and havinghigh total GAD-7 score (β = 0.165, 95% CI: 0.123 to 0.349; p = 0.000) were the predictors of havinggreater fear of COVID-19 (Table 3).

COVID-19 and anxiety

The mean total GAD-7 score of the participants was 4.61 ±4.45. Of all the participants, 218 (72%) had minimal depressive symptoms, 58 (19%) had mild symptoms and 25 (8%) had moderate-to-severe symptoms. Subjects with moderate-to-severe depressive symptoms were mostly female (n = 19, 10%), single (n = 16, 11%) and they were smokers (n =12, 16%). There were no significant differences across the different age and educational status categories (Table 1). There wasstrong negative correlation between the GAD-7 score and the COVID-19 know­ledge level (r = −0.136; p < 0.05). In contrast,significant positive correlation was observed between the FCoV-19S score and the GAD-7 score (r = 0.236; p < 0.001) (Table 3).


This study is the first to evaluate the impact of the COVID-19 pandemic on the psychological status of dental patients in Turkey. The most important finding of this study is that the participants who were very worried about contracting COVID-19 were also identified as fearful and anxious. Given the novelty of the disease, it is natural that people are more prone to fear when faced with unknown situations.

In this study, the mean FCoV19S score was in line with the scores reported in the studies conducted in other populations.31, 32 According to our results, female gender was significantly related to increased fear.33 The authors of a large-scale nationwide survey examining psychological distress among Chinese people during the COVID-19 pandemic observed the same gender effect, with females reporting significantly higher psychological distress than males.34

Perceiving the disease as serious and being afraid of attendingdental visit due to the possibility of contracting COVID-19 were found to be significant factors for the fear of COVID-19 in this study. This is an important finding that demonstrates the negative impact of the COVID-19 pandemic on the frequency of dental clinic visits. Similarly, a retrospective clinical study conducted in China reported that the COVID-19 pandemic significantly affected individuals’ dental care-seeking behaviors.35 Moffat et al. conductedstudy in the United States on the identification of dental patients’ perception of risk and attitude toward COVID-19; the participants reported that contracting COVID-19 from other patients indental clinic represented the greatest risk related to dental care.27 Moreover, Kranz et al. reported that half of their participants delayed their dental visits and treatment due to the fear of contracting the virus during dental procedures.14

In this study, female participants hadsignificantly higher level of fear regarding dental visits due to the possibility of contracting COVID-19 as compared to males (p < 0.05). These results are consistent withprevious study, which found that females were more concerned about the risk of the aerosolized spread of infection during dental treatment and showed increased levels of stress during dental treatment.22

The majority of the participants (87%) in the pre­sent study showedsufficient level of knowledge about COVID-19, which is essential to limiting the spread of the disease.36 Moreover, the knowledge levels were significantly higher in patients with a higher educational status and in males (p < 0.05). Similarly, Zhong et al. found that young females withlow educational status tended to have less knowledge regarding COVID-19.37 In contrast, Nooh et al. reported no significant association between individuals’ COVID-19 knowledge levels and gender or educational status.38 Despite contradictory results in the literature, the findings of this study suggest that highly educated individuals are effective in retrieving reliable information, which may influence their COVID-19 know­ledge levels.

Another important finding of this study issignificant negative correlation between the participants’ know­ledge level and FCoV-19S score (r = −0.808; p < 0.05) and anxiety level (r = −0.136; p < 0.05). These results are consistent with previous research, which determined that receiving adequate knowledge about the transmission routes of COVID-19 was correlated with lower levels of anxiety.39

The present study demonstrated that the COVID-19 pandemic had impacted the anxiety levels in dental patients, with 8% of them reporting moderate-to-severe anxiety, which is similar to the 7% reported among the general population in China.40 Furthermore, Cotrin et al. reported that the COVID-19 pandemic and quarantine protocols influenced orthodontic patients’ anxiety levels.41 In the present study, there wassignificant positive associa­tion between the FCoV-19S score and the GAD-7 score. Recent studies found that the fear of COVID-19 was significantly correlated with anxiety and depression.42, 43 These results suggest that dental patients may need psycho­logical support during the COVID-19 pandemic to maintain their mental health. In addition, the current situation may affect the oral health of people in the near future, as previous studies have clearly shownstrong relationship between oral health and mood conditions, such as stress, anxiety and depression.44

In the present study, the major source of information associated with COVID-19 was television, followed by the Internet and social media.cross-sectional study conducted with 9,796 respondents from the Netherlands, Germany and Italy found that most participants acquired information about COVID-19 from traditional sources (e.g., television and newspapers).45 Moreover, there wassignificant positive correlation between the participants’ knowledge levels and the use of the Internet (r = 0.133; p < 0.05) observed in the present study. Our findings are consistent with previous studies.45, 46

When evaluating the reliability and quality of the information found on the Internet, Hernández-García and Giménez-Júlvez reported that official health organizations provided more accurate information about protective measures against COVID-19.45 In the present study, the Turkish Ministry of Health official website was the most common source of information about COVID-19 reported by the participants (89%). This website has been working efficiently since the beginning of the pandemic and its portal regularly updates information about COVID-19, according to the WHO guidelines.


This study has several limitations. Firstly, the study was cross-sectional in nature and could not establish causa­lity for the outcome. Additionally, the results may only reflect the mental health status during the pandemic. Secondly, although the measurements used in the study had satisfactory psychometric properties, the results were self-reported, which could have led to recall bias. However,paper-based questionnaire was used in this study, which could have eliminated the selection bias observed in online surveys. Finally, the results were based onsingle institution; nevertheless, our faculty was the only referral center for dental care in our region during the pandemic. Larger prospective nationwide studies are needed. The findings of this study are useful for public health professionals in recognizing target populations for specific COVID-19 pandemic-related mental health manage­ment and intervention strategies.


The results of this study suggest that the COVID-19 pandemic has had a significant psychological impact on dental patients. Psychological support may be needed to help dental patients manage their fear and anxiety. It is also understandable that, due to the increasing fear of COVID-19, patients may develop dental care avoidance behaviors. Therefore, effective physician–patient communication should be established to prevent mis­conception, and strict infection control measures should be taken by dental clinics to reduce the risk of COVID-19.

Ethics approval and consent to participate

The study was approved by the Ethics Committee at the Faculty of Medicine of Akdeniz University, Antalya, Turkey (No. of approval: 70904504/706). Written informed consent was obtained from all participants.

Data availability

The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

Consent for publication

Not applicable.


Table 1. Participants’ characteristics, and the comparison of the fear of COVID-19 scale (FCoV-19S) scores, the generalized anxiety disorder-7 scale (GAD-7) scores and the knowledge levels


n (%)
total N = 301

FCoV-19S score


GAD-7 score


Knowledge level




201 (66.8)

18.07 ±5.71


3.43 ±4.09


1.92 ±0.49



92 (30.6)

17.97 ±5.37

2.73 ±3.71

1.91 ±0.55


8 (2.7)

20.38 ±7.46

3.21 ±2.38

1.93 ±0.49



117 (38.9)

16.47 ±5.10


2.51 ±3.50


7.97 ±2.11



184 (61.1)

19.14 ±6.05

3.65 ±4.15

7.46 ±1.97



259 (86.0)

18.00 ±5.56


3.17 ±3.96


7.67 ±2.08



42 (14.0)

18.71 ±6.12

3.43 ±3.89

7.59 ±1.78

Tobacco use (current)


77 (25.6)

19.03 ±6.21


4.06 ±4.89


7.39 ±2.37



224 (74.4)

17.79 ±5.41

2.92 ±3.53

7.75 ±1.90

Marital status


152 (50.5)

18.09 ±5.61


2.54 ±3.29


7.48 ±2.20



149 (49.5)

18.11 ±5.68

3.89 ±4.43

7.85 ±1.85

Having children


151 (50.2)

18.01 ±5.79


2.88 ±3.76


7.49 ±2.15



150 (49.8)

18.19 ±5.49

3.54 ±4.11

7.83 ±1.91

Employment status


181 (60.1)

18.59 ±5.57


3.08 ±3.79


7.64 ±2.01



120 (39.9)

17.38 ±5.67

3.41 ±4.18

7.70 ±2.09

Educational status

primary school

37 (12.3)

18.43 ±5.30


2.32 ±3.66


6.83 ±2.43


high school

83 (27.6)

18.88 ±5.82

3.24 ±4.11

7.32 ±2.22


28 (9.3)

16.82 ±5.50

2.07 ±2.91

7.85 ±1.75


136 (45.2)

17.87 ±5.61

3.51 ±4.03

7.99 ±1.76

master’s degree/Ph.D.

17 (5.6)

17.59 ±5.91

4.47 ±4.15

8.17 ±2.09

Place of residence


287 (95.3)

18.15 ±5.63


3.12 ±3.83


7.66 ±2.02



14 (4.7)

17.07 ±5.74

5.07 ±5.66

7.57 ±2.44

Anxiety (GAD-7)


218 (72.4)

17.52 ±5.38


7.75 ±1.98



58 (19.3)


7.70 ±2.21


25 (8.3)

22.72 ±4.93

6.80 ±1.97

COVID-19 – coronavirus disease 2019; M – mean; SD – standard deviation; * statistically significant (p < 0.05); ** statistically significant (p < 0.001).
Table 2. Scores of the participants’ responses to the fear of COVID-19 scale (FCoV-19S) items




1. I am most afraid of COVID-19


3.56 ±1.24

2. It makes me uncomfortable to think about COVID-19


3.38 ±1.32

3. My hands become clammy when I think about COVID-19


1.93 ±1.13

4. I am afraid of losing my life because of COVID-19


2.83 ±1.38

5. When I watch the news and stories about COVID-19 on social media, I become nervous or anxious


2.86 ±1.24

6. I cannot sleep, because I am worrying about getting COVID-19


1.71 ±0.99

7. My heart races or palpitates when I think about getting COVID-19


1.84 ±1.07

Table 3. Results of multiple linear regression analysis of the predictors of the fear of COVID-19 (with reference to FCoV-19S)




95% CI for β





(0.016 to 0.275)


Knowledge levelb



(−0.935 to −0.680)


Is COVID-19 a serious disease?c



(0.058 to 0.328)


Are you afraid to visit the dental clinic due to the possibility of contagion with COVID-19?d



(0.504 to 0.792)





(0.123 to 0.349)


r – Spearman’s rank correlation coefficient; β – regression coefficient; CI – confidence interval; a males as the reference group; b total score for the knowledge level; c response to item “Is COVID-19 a serious disease?” with ‘no’ as the reference group; d response to item “Are you afraid to visit the dental clinic due to the possibility of contagion with COVID-19?” with ‘no’ as the reference group; e total score on GAD-7; * statistically significant (p < 0.05); ** statistically significant (p < 0.001).

References (46)

  1. Cucinotta D, Vanelli M. WHO declares COVID-19 a pandemic. Acta Biomed. 2020;91(1):157–160. doi:10.23750/abm.v91i1.9397
  2. Nicola M, Alsafi Z, Sohrabi C, et al. The socio-economic implications of the coronavirus pandemic (COVID-19): A review. Int J Surg. 2020;78:185–193. doi:10.1016/j.ijsu.2020.04.018
  3. Harper CA, Satchell LP, Fido D, Latzman RD. Functional fear predicts public health compliance in the COVID-19 pandemic. Int J Ment Health Addict. 2021:19(5):1875–1888. doi:10.1007/s11469-020-00281-5
  4. Pakpour AH, Griffiths MD, Chang KC, Chen YP, Kuo YJ, Lin CY. Assessing the fear of COVID-19 among different populations: A response to Ransing et al. (2020). Brain Behav Immun. 2020;89:524–525. doi:10.1016/j.bbi.2020.06.006
  5. Torales J, O’Higgins M, Castaldelli-Maia JM, Ventriglio A. The outbreak of COVID-19 coronavirus and its impact on global mental health. Int J Soc Psychiatry. 2020;66(4):317–320. doi:10.1177/0020764020915212
  6. Jahrami H, BaHammam AS, Bragazzi NL, Saif Z, Faris M, Vitiello MV. Sleep problems during the COVID-19 pandemic by population: A systematic review and meta-analysis. J Clin Sleep Med. 2021;17(2):299–313. doi:10.5664/jcsm.8930
  7. Deng J, Zhou F, Hou W, et al. The prevalence of depression, anxiety, and sleep disturbances in COVID-19 patients: A meta-analysis. Ann N Y Acad Sci. 2021;1486(1):90–111. doi:10.1111/nyas.14506
  8. Huang Y, Zhao N. Generalized anxiety disorder, depressive symptoms and sleep quality during COVID-19 epidemic in China: A web-based cross-sectional survey. Psychiatry Res. 2020;288:112954. doi:10.1016/j.psychres.2020.112954
  9. Emodi-Perlman A, Eli I, Uziel N, et al. Public concerns during the COVID-19 lockdown: A multicultural cross-sectional study among Internet survey respondents in three countries. J Clin Med. 2021;10(8):1577. doi:10.3390/jcm10081577
  10. Meng L, Hua F, Bian Z. Coronavirus disease 2019 (COVID-19): Emerging and future challenges for dental and oral medicine. J Dent Res. 2020;99(5):481–487. doi:10.1177/0022034520914246
  11. Banakar M, Lankarani KB, Jafarpour D, Moayedi S, Banakar MH, MohammadSadeghi A. COVID-19 transmission risk and protective protocols in dentistry: A systematic review. BMC Oral Health. 2020;20(1):275. doi:10.1186/s12903-020-01270-9
  12. Moynihan R, Sanders S, Michaleff ZA, et al. Impact of COVID-19 pandemic on utilisation of healthcare services: A systematic review. BMJ Open. 2021;11(3):e045343. doi:10.1136/bmjopen-2020-045343
  13. Lazzerini M, Barbi E, Apicella A, Marchetti F, Cardinale F, Trobia G. Delayed access or provision of care in Italy resulting from fear of COVID-19. Lancet Child Adolesc Health. 2020;4(5):e10–e11. doi:10.1016/S2352-4642(20)30108-5
  14. Kranz AM, Gahlon G, Dick AW, Stein BD. Characteristics of US adults delaying dental care due to the COVID-19 pandemic. JDR Clin Trans Res. 2021;6(1):8–14. doi:10.1177/2380084420962778
  15. Hopcraft M, Farmer G. Impact of COVID-19 on the provision of paediatric dental care: Analysis of the Australian Child Dental Benefits Schedule. Community Dent Oral Epidemiol. 2021;49(4):369–376. doi:10.1111/cdoe.12611
  16. Shacham M, Hamama-Raz Y, Kolerman R, Mijiritsky O, Ben-Ezra M, Mijiritsky E. COVID-19 factors and psychological factors associated with elevated psychological distress among dentists and dental hygienists in Israel. Int J Environ Res Public Health. 2020;17(8):2900. doi:10.3390/ijerph17082900
  17. Özarslan M, Caliskan S. Attitudes and predictive factors of psychological distress and occupational burnout among dentists during COVID-19 pandemic in Turkey. Curr Psychol. 2021;40(7):3113–3124. doi:10.1007/s12144-021-01764-x
  18. Saddik B, Hussein A, Sharif-Askari FS, et al. Increased levels of anxiety among medical and non-medical university students during the COVID-19 pandemic in the United Arab Emirates. Risk Manag Healthc Policy. 2020;13:2395–2406. doi:10.2147/RMHP.S273333
  19. Marvaldi M, Mallet J, Dubertret C, Moro MR, Guessoum SB. Anxiety, depression, trauma-related, and sleep disorders among healthcare workers during the COVID-19 pandemic: A systematic review and meta-analysis. Neurosci Biobehav Rev. 2021;126:252–264. doi:10.1016/j.neubiorev.2021.03.024
  20. Kamal AT, Sukhia RH, Ghandhi D, Sukhia HR. Stress and anxiety among dental practitioners during the COVID-19 pandemic: A cross-sectional survey. Dent Med Probl. 2021;58(2):139–146. doi:10.17219/dmp/131115
  21. Yip HK, Tsang PC, Samaranayake LP, Li AH. Knowledge of and attitudes toward severe acute respiratory syndrome among a cohort of dental patients in Hong Kong following a major local outbreak. Community Dent Health. 2007;24(1):43–48. PMID:17405470.
  22. Ashok N, Rodrigues JC, Azouni K, et al. Knowledge and apprehension of dental patients about MERS – a questionnaire survey. J Clin Diagn Res. 2016;10(5):ZC58–ZC62. doi:10.7860/JCDSR/2016/17519.7790
  23. Von Elm E, Altman DG, Egger M, Pocock SJ, Gøtzsche PC, Vandenbroucke JP; STROBE Initiative. The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: Guidelines for reporting observational studies. J Clin Epidemiol. 2008;61(4):344–349. doi:10.1016/j.jclinepi.2007.11.008
  24. Ahorsu DK, Lin CY, Imani V, Saffari M, Griffiths MD, Pakpour AH. The Fear of COVID-19 Scale: Development and initial validation. Int J Ment Health Addict. 2022;20(3):1537–1545. doi:10.1007/s11469-020-00270-8
  25. Spitzer RL, Kroenke K, Williams JB, Löwe B. A brief measure for assessing generalized anxiety disorder: The GAD-7. Arch Intern Med. 2006;166(10):1092–1097. doi:10.1001/archinte.166.10.1092
  26. Hassen LM, Almaghlouth IA, Hassen IM, et al. Impact of COVID-19 outbreak on rheumatic patients’ perceptions and behaviors: A cross-sectional study. Int J Rheum Dis. 2020;23(11):1541–1549. doi:10.1111/1756-185X.13959
  27. Moffat RC, Yentes CT, Crookston BT, West JH. Patient perceptions about professional dental services during the COVID-19 pandemic. JDR Clin Trans Res. 2021;6(1):15–23. doi:10.1177/2380084420969116
  28. Peloso RM, Pavesi Pini NI, Net DS, et al. How does the quarantine resulting from COVID-19 impact dental appointments and patient anxiety levels? Braz Oral Res. 2020;34:e84. doi:10.1590/1807-3107bor-2020.vol34.0084
  29. Satici B, Gocet-Tekin E, Deniz ME, Satici SA. Adaptation of the Fear of COVID-19 Scale: Its association with psychological distress and life satisfaction in Turkey. Int J Ment Health Addict. 2021;19(6):1980–1988. doi:10.1007/s11469-020-00294-0
  30. Konkan R, Şenormanci Ö, Güçlü O, Aydin E, Sungur MZ. Validity and reliability study for the Turkish adaptation of the Generalized Anxiety Disorder-7 (GAD-7) scale [in Turkish]. Arch Neuropsychiatry. 2013;50(1):53–58. doi:10.4274/npa.y6308
  31. Doshi D, Karunakar P, Sukhabogi JR, Prasanna JS, Mahajan SV. Assessing coronavirus fear in Indian population using the Fear of COVID-19 Scale. Int J Ment Health Addict. 2021;19(6):2383–2391. doi:10.1007/s11469-020-00332-x
  32. Formighieri Giordani RC, Zanoni da Silva M, Muhl C, Giolo SR. Fear of COVID-19 scale: Assessing fear of the coronavirus pandemic in Brazil. J Health Psychol. 2022;27(4):901–912. doi:10.1177/1359105320982035
  33. Wieckiewicz M, Danel D, Pondel M, et al. Identification of risk groups for mental disorders, headache and oral behaviors in adults during the COVID-19 pandemic. Sci Rep. 2021;11(1):10964. doi:10.1038/s41598-021-90566-z
  34. Qiu J, Shen B, Zhao M, Wang Z, Xie B, Xu Y. A nationwide survey of psychological distress among Chinese people in the COVID-19 epidemic: Implications and policy recommendations. Gen Psychiatr. 2020;33(2):e100213. doi:10.1136/gpsych-2020-100213
  35. Guo H, Zhou Y, Liu X, Tan J. The impact of the COVID-19 epidemic on the utilization of emergency dental services. J Dent Sci. 2020;15(4):564–567. doi:10.1016/j.jds.2020.02.002
  36. Lin Y, Huang L, Nie S, et al. Knowledge, attitudes and practices (KAP) related to the pandemic (H1N1) 2009 among Chinese general population: A telephone survey. BMC Infect Dis. 2011;11:128. doi:10.1186/1471-2334-11-128
  37. Zhong BL, Luo W, Li HM, et al. Knowledge, attitudes, and practices towards COVID-19 among Chinese residents during the rapid rise period of the COVID-19 outbreak: A quick online cross-sectional survey. Int J Biol Sci. 2020;16(10):1745–1752. doi:10.7150/ijbs.45221
  38. Nooh HZ, Alshammary RH, Alenezy JM, et al. Public awareness of coronavirus in Al-Jouf region, Saudi Arabia. Z Gesundh Wiss. 2021;29(5):1107–1114. doi:10.1007/s10389-020-01209-y
  39. Basch CH, Hillyer GC, Meleo-Erwin ZC, Jaime C, Mohlman J, Basch CE. Preventive behaviors conveyed on YouTube to mitigate transmission of COVID-19: Cross-sectional study. JMIR Public Health Surveill. 2020;6(2):e18807. doi:10.2196/18807
  40. Consolo U, Bellini P, Bencivenni D, Iani C, Checchi V. Epidemiological aspects and psychological reactions to COVID-19 of dental practitioners in the Northern Italy districts of Modena and Reggio Emilia. Int J Environ Res Public Health. 2020;17(10):3459. doi:10.3390/ijerph17103459
  41. Cotrin P, Peloso RM, Oliveira RC, et al. Impact of coronavirus pandemic in appointments and anxiety/concerns of patients regarding orthodontic treatment. Orthod Craniofac Res. 2020;23(4):455–461. doi:10.1111/ocr.12395
  42. Choi EPH, Hui BPH, Wan EYF. Depression and anxiety in Hong Kong during COVID-19. Int J Environ Res Public Health. 2020;17(10):3740. doi:10.3390/ijerph17103740
  43. Soraci P, Ferrari A, Abbiati FA, et al. Validation and psychometric evaluation of the Italian version of the Fear of COVID-19 Scale. Int J Ment Health Addict. 2022;20(4):1913–1922. doi:10.1007/s11469-020-00277-1
  44. Kisely S, Sawyer E, Siskind D, Lalloo R. The oral health of people with anxiety and depressive disorders – a systematic review and meta-analysis. J Affect Disord. 2016;200:119–132. doi:10.1016/j.jad.2016.04.040
  45. Hernández-García I, Giménez-Júlvez T. Assessment of health information about COVID-19 prevention on the Internet: Infodemiological study. JMIR Public Health Surveill. 2020;6(2):e18717. doi:10.2196/18717
  46. Abdelhafiz AS, Mohammed Z, Ibrahim ME, et al. Knowledge, perceptions, and attitude of Egyptians towards the novel coronavirus disease (COVID-19). J Community Health. 2020;45(5):881–890. doi:10.1007/s10900-020-00827-7