Rosar JV, Marquezin MCS, Pizzolato AS, et al. - This study was undertaken to investigate predictive factors of sleep bruxism (SB) severity among polysomnographic (PSG) parameters, salivary cortisol levels, temporomandibular disorders, age and gender. Researchers screened young adults (19-30 years old) for self/roommate reports of teeth grinding/clenching during sleep linked to clinical signs of tooth wear. In the analysis, those positive for both conditions were submitted to a PSG exam to definitely diagnose SB (n=28). They also enrolled healthy participants without SB signs/symptoms (n=15). They used Research Diagnostic Criteria/TMD to ascertain functional, muscular and articular domains of the Temporomandibular Index. The data exhibited that SB severity was prognosticated by muscular and functional scores, female sex and specific PSG patterns, contributing to deepen the knowledge of the underlying pathophysiology of SB severity.  Salivary cortisol levels were not associated to SB severity and did not differ between groups.