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Although bruxism, either during awake and during sleep is still a controversial topic in contemporary Medicine, its prevalence and its putative relationship with several conditions interfering with health and wellbeing make it relevant as a target to be studied in distinct scientific domains. Histological and morphological on the craniomandibular complex (CC) have been documented with different techniques. However, there is a lack of high quality imaging studies showing structural changes among the different anatomical structures therefore leading to a misinterpretation of the real impact of bruxism on such elements.The aim of this clinical retrospective comparative study was to investigate whether there are structural differences on the craniomandibular complex of bruxers in face to non-bruxers evaluated by a cone-beam computed tomohraphy (CBCT). We present the preliminary findings of this still ongoing study. Methods A retrospective analysis of CBCT imaging exams from patients with ages between 18 and 44 years old, were distributed among 1) bruxism group:BG (n=31); 2) Non-bruxism/Control group (n=21). Bruxism diagnosis followed non-instrumental approach suggested by the bruxism consensus 2013. To the craniomorphological evaluation, 3D CBCT SYM Diagnosis protocol was implemented by a calibrated expert at an adequate local with reduced light. Photograpic parameters were analyzed according to standard procedures. Results Female gender prevailed without differences between groups (61,3% in BG and 66,7 in CG; p=0,91). Age of BG was significantly higher than CG (40,1 yo versus 28,4;p=0,002). Mandibular structure as inferred by its shape was significantly higher in BG compared with CG. Conclusion In this preliminary study the CBCT 3D image showed important and significant changes in mandibular structure in bruxers compared with non-bruxers. Support (if any):

520 A Cone-Beam Computed Tomography Study on the Impact of Bruxism in Craniomandibular Morphology of Adults. Preliminary findings