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  • Dentists
  • Dental Hygienists
  • Dental Assisting
Hours: 3 Contact Hours
Author(s): Sharon Crowe, RDH, BSDH, MS
Peer Reviewer(s): Maritza E. Mendez, DMD
Item#: L0779
Contents: 1 Course Book (30 pages)
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Recurrent Aphthous Stomatitis: A Review for Dental Professionals, 2nd Edition

Price $29.95
Item # L0779
When available, the Online Course format is included with the hard copy, eBook, or audio book formats!

Release Date: July 30, 2013

Review Date: September 7, 2016

Expiration Date: September 6, 2019


Recurrent aphthous stomatitis (RAS) – also known as recurrent aphthous ulcerations, aphthous ulcerations, and canker sores – is a chronic inflammatory disease that is characterized by painful oral ulcers that recur with varying frequency. Although the etiology of RAS is multifactorial, it has been linked to decreased levels of folic acid and other hematologic deficiencies, including deficiencies in vitamin B12, iron, and ferritin. Hematologic deficiencies may be a significant risk factor for RAS.

Numerous medical conditions, as well as certain medications taken over long periods, can also cause RAS. When a patient is experiencing these painful ulcerations, the dental professional must have sufficient knowledge to identify the predisposing factors for RAS and make the connection between the occurrence of RAS and certain medical conditions or medication usage.

After reviewing the etiology and symptoms of RAS, as well as the predisposing factors for development of these oral ulcerations, this basic-level course outlines the process for diagnosing RAS and the treatments currently available for the different types of RAS.



AGD Subject Code: 730
Western Schools designates this activity for 3 continuing education credits.



Course Objectives

  • Explain the prevalence and etiology of recurrent aphthous stomatitis (RAS).
  • List the signs and symptoms of RAS.
  • Discuss the process of diagnosing RAS.
  • Identify the predisposing factors for RAS.
  • Discuss the types of RAS and their treatment.


Sharon Crowe, RDH, BSDH, MS, graduated from Northwestern University in Evanston, Illinois, with a bachelor of science degree in dental hygiene, and completed a master of science degree at Silver Lake College in Manitowoc, Wisconsin. Ms. Crowe was a practicing dental hygienist for more than 25 years. For more than a decade, she worked developing curriculum and teaching in the dental hygienist program at Fox Valley Technical College in Appleton, Wisconsin, before accepting a teaching and curriculum development position at Nicolet College in Rhinelander, Wisconsin. She also works as an administrator for a family health center in Rhinelander. Ms. Crowe has published several continuing education courses in the dental field.


Maritza E. Mendez, DMD, received a BA degree in psychology from Temple University and a DMD degree from the University of Pennsylvania. At the University of California, San Francisco (UCSF), she was chief resident in general dentistry. From 1995 to 2005, she was an assistant clinical professor at UCSF, as well as assistant director of the Advanced Education in General Dentistry Residency program and assistant director of the University’s Buchanan Dental Center. Dr. Mendez is an associate professor at the University of the Pacific’s Arthur A. Dugoni School of Dentistry, and currently teaches dental hygiene at the Stockton campus of the University of the Pacific, as well as at Carrington College. Dr. Mendez maintained a general dental practice at the Arthur A. Dugoni School of Dentistry until 2013. She has authored and co-authored articles in peer-reviewed journals, as well as in popular publications aimed at educating the public in oral hygiene, dry mouth, and the relation of diet to oral health. She has given presentations on a variety of topics, including medical emergencies in the dental practice and conscious sedation.

  • Courses must be completed on or before the expiration date noted in the course description above.
  • You must score 75% or higher on the final exam and complete the course evaluation to pass this course and receive a certificate of completion.
  • Through our review processes, Western Schools ensures that the course content is presented in a balanced, unbiased manner and is free from commercial influence. It is Western Schools’ policy not to accept commercial support.
  • All persons involved in the planning and development of this course have disclosed no relevant financial relationships or other conflicts of interest related to the course content.
  • There are no prerequisites for this course.