Does TMJ function and imaging tools help differentiate between Condylar Resorption and Mandibular Hypoplasia

Abstract Purpose Differentiating between bilateral condylar resorption (CR) and mandibular hypoplasia (MH) may be challenging due to the difficulty in chronological observation and establishing standardized measurements. The purpose of the present study was to assess whether temporomandibular joint (TMJ) function can distinguish between CR and MH and clarify the essential diagnostic imaging tools for CR. Materials and Methods We performed a cross-sectional study of patients with mandibular retrognathia. The primary predictor variables were a clinical dysfunction score of TMJ, mandibular plane angle (MPA), SNA angle, SNB angle, and cortical erosion score in the condylar heads. The demographic variables were age, anterior disc displacement, and previous orthodontic treatment. The anatomical variable was a condylar height (CH). The primary outcome variable was disease status of CR and MH. The patients were divided into the CR group and the MH group. The patients with CR were selected on the basis of a CH value of Results In total, 23 female participants were enrolled in this study. The average clinical dysfunction scores of the TMJ were 4.4 in the CR group and 0.4 in the MH group (P Conclusion This investigation shows that assessing TMJ function and analyzing MPA using a cephalometric X-ray could differentiate CR from MH.