Background: Recurrent aphthous stomatitis (RAS) is a common oral disorder that despite extensive researches, the eria/oXy ofthis phenomenon is still IIl/kn(JI1'/I Because this phenomenon has been observed more often ill families than in indil'idllal cases, genetic i/~/luellct! has been investigated ill most researches", Purpose: The aim (~r study was to evaluate the ass(lciatioll between human …