What is the Ulcer Severity Score (USS) for the assessment of aphthous stomatitis (canker sore)?

Updated: Sep 25, 2020
  • Author: Ginat W Mirowski, MD, DMD; Chief Editor: William D James, MD  more...
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In 2013, Tappuni et al introduced the Ulcer Severity Score (USS) because of the lack of standardized assessment methods for aphthous stomatitis. [79] The USS incorporates six ulcer characteristics: number, size, duration, ulcer-free period, site, and pain. This scoring template may be of value to future studies assessing treatment efficacy, although at present it is not widely used. Challacombe et al suggest using the USS in combination with the Oral Health Related Quality of Life (OHR-QoL) score in order to better estimate the impact of clinically significant aphthous stomatitis on patients. [80]

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