Knowledge of Oral Precancerous Lesions Considering Years Since Graduation Among Dentists in the Capital City of Iran: a Pathway to Early Oral Cancer Diagnosis and Referral?

Document Type : Research Articles


1 Oral Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

2 Dental Material Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.

3 Honorary Research Fellow, International Research Collaborative – Oral Health and Equity, Department of Anatomy, Physiology and Human Biology University of Western Australia, Perth, Australia.

4 Dentist, Shahid Beheshti University of Medical Sciences, Tehran, Iran.


Background: Late diagnosis and improper treatment lead to many avoidable deaths in patients suffering from oral
cancer. This study evaluated the knowledge and perceptions of general dentists regarding oral precancerous lesions
and oral cancer risk factors with reference to early diagnosis and referral. Materials and Methods: In this descriptive
study, 200 private general dental practitioners were randomly selected in Tehran, Iran. Demographic information and
years since graduation were recorded; knowledge levels were evaluated with a standardized questionnaire consisting of
15 closed-response item questions about precancerous lesions and oral cavity cancer. Each correct answer got one
point. Results: Out of 200 selected dentists, 153 returned completed questionnaires. The average age of participants
was 36 and the average achieved score was 7.96 out of 15 (Min 3, Max 13). Most (64.7%) of participants were in
the group that graduated within the previous 10 years, 23.5% between 10 and 20 years since graduation, and 11.8%
more than 20 years previously. There was a statistically significant difference between the most recently graduated
group (< 10 years) and the other two groups. The dentists’ awareness was also significantly dependent on age. There
was no statistically significant difference in awareness between male and female dentists. Conclusion: As professional
oral health care providers, dentists should be aware of all aspects regarding precancerous lesions in order to optimize
early diagnosis and referral of oral cancer patients. Training courses and continuing education seem to be an essential
strategy to increase and maintain knowledge of this group.


Main Subjects

Volume 19, Issue 8
August 2018
Pages 2103-2108
  • Receive Date: 10 July 2017
  • Revise Date: 07 June 2018
  • Accept Date: 09 July 2018
  • First Publish Date: 01 August 2018