Relationship between Mandibular Condyle Position and Dental Wear Pattern in Individuals with Sleep Bruxism Clinical Diagnosis
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Background: Sleep bruxism (SB) is an oromandibular activity with teeth grinding and clenching and a masticatory muscle activity. It generates temporomandibular dysfunction (TMD), tooth wear and mobility, as well as other clinical findings. It is important to analyze occlusion and TMJ to determine how it is affected by the biomechanical load generated by bruxism. Purpose: To establish the relationship between the condylar position of the temporomandibular joint (TMJ) using cone beam computed tomography (CBCT) with the dental wear patterns determined with the BruxChecker®, in subjects with a clinical diagnosis of sleep bruxism. Methods: Observational, descriptive, cross-sectional study in 45 patients with clinical diagnosis of sleep bruxism, according to the bruxism diagnostic criteria of the AASM (American Academy of Sleep Medicine), with an average age of 34.9 ± 8.6. The CBCT were analyzed, measuring the spaces of the TMJ in the sagittal plane: anterior, superior and posterior (SA, SS, SP) and in the coronal plane: lateral, superior and medial (Cl, CS, CM). The pattern of dental wear was classified with the BruxChecker® by dividing the subjects into: Group 1, canine pattern (CP) with 19 subjects and Group 2, molar pattern (MP) with 26 subjects. Results: No significant differences were observed between the measurements of the joint spaces of each group nor in the comparison between the PC vs PM patterns. The sagittal position of the condyle posterior/anterior(P/A) was posterior and the coronal medial/lateral (M/L) was medial for the two groups, when evaluating the ratios. Significant difference (P <0.00) was found in right pattern CP and MP, when estimating the difference between averages of medial and lateral spaces. Conclusions: The position of the condyle was found posterior and medial in the articular fossa, in the right CP and in the left MP. A significant right lateral condyle position was evidenced in PC and PM. These findings indicate an altered condylar position in subjects with bruxism, which can be associated with joint distraction, possibly generated by constant eccentric mandibular movements during bruxism.
articulación temporomandibular, BruxChecker®, bruxismo del sueño, odontología, tomografía computarizada de haz cónico, trastornos temporomandibularesBruxChecker®, cone-beam computed tomography, dentistry, mandibular condyle, sleep bruxism, temporomandibular joint, temporomandibular disordersarticulação temporomandibular, BruxChecker®, bruxismo do sono, côndilo mandibular, distúrbios temporomandibulares, odontologia, tomografia computadorizada de feixe cônico
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