Facial Asymmetry: A Narrative Review of the Most Common Neurological Causes

Skeletal facial asymmetry: reliability of manual and artificial intelligence-driven analysis

OBJECTIVES

To compare artificial intelligence (AI)-driven web-based platform and manual measurements for analysing facial asymmetry in craniofacial CT examinations.

METHODS

The study included 95 craniofacial CT scans from patients aged 18-30 years. The degree of asymmetry was measured based on AI platform-predefined anatomical landmarks: sella (S), condylion (Co), anterior nasal spine (ANS), and menton (Me). The concordance between the results of automatic asymmetry reports and manual linear 3D measurements was calculated. The asymmetry rate (AR) indicator was determined for both automatic and manual measurements, and the concordance between them was calculated. The repeatability of manual measurements in 20 randomly selected subjects was assessed. The concordance of measurements of quantitative variables was assessed with interclass correlation coefficient (ICC) according to the Shrout and Fleiss classification.

RESULTS

Erroneous AI tracings were found in 16.8% of cases, reducing the analysed cases to 79. The agreement between automatic and manual asymmetry measurements was very low (ICC < 0.3). A lack of agreement between AI and manual AR analysis (ICC type 3 = 0) was found. The repeatability of manual measurements and AR calculations showed excellent correlation (ICC type 2 > 0.947).

CONCLUSIONS

The results indicate that the rate of tracing errors and lack of agreement with manual AR analysis make it impossible to use the tested AI platform to assess the degree of facial asymmetry.

Age-Related Quality of Life and Psychosocial Impact of Chin Asymmetry in Adolescents and Young Adults Undergoing Orthodontic and Orthognathic Correction

Craniofacial asymmetry can have significant psychosocial implications, affecting the quality of life in adolescents and young adults. This study aimed to assess the impact of age and complexity of craniofacial asymmetry on quality of life and psychosocial outcomes in patients undergoing orthodontic and orthognathic correction. A cross-sectional study was conducted on 149 patients aged 13-26 years with moderate or severe craniofacial asymmetry that had a gnathion deviation higher than 2 mm, according to the American Association of Orthodontists. Participants were divided into three groups: teenagers (n = 53), adults (n = 46), and a control group (n = 50) with relative craniofacial asymmetry. Quality of life and psychosocial impacts were evaluated using validated questionnaires that measure health-related quality of life (SF-36), body image satisfaction and self-acceptance (BIQLI), anxiety and depression levels (HADS), and perceived stress (PSS-10). These tools provided an encompassing appraisal of the psychological and social implications associated with craniofacial asymmetry before and six months after orthodontic and orthognathic correction. Before the intervention, adults had higher mental health scores compared to teenagers (p = 0.037). At the 6-month follow-up, no significant differences in mental health scores were observed between the two groups (p = 0.121). BIQLI results showed significant differences in satisfaction with appearance and self-acceptance between teenagers and adults, both before intervention (p = 0.045 and p = 0.051, respectively) and at six months (p = 0.062 and p = 0.031, respectively). HADS results showed significant differences in anxiety levels before intervention (p = 0.039) but not at six months (p = 0.133). PSS-10 results showed no significant differences in perceived stress between the groups. In conclusion, this study demonstrates that craniofacial asymmetry significantly impacts the quality of life and psychosocial well-being of adolescents and young adults. Specifically, teenagers, as compared to young adults, reported lower satisfaction with their appearance and lower self-acceptance before intervention, underscoring the profound psychosocial challenges that adolescents with craniofacial asymmetry may experience. These age-related differences underscore the importance of tailored interventions to address unique psychosocial needs at different developmental stages.

Evaluation of temporomandibular joint dysfunction in traumatic brain injury patients

BACKGROUND

The aim of this study was to evaluate the frequency of temporomandibular joint dysfunction and related factors in patients with traumatic brain injury.

METHODS

A total of 60 participants, 30 patients with traumatic brain injury and 30 healthy volunteers of similar age, have been included in this study, which was designed as a hospital-based cross sectional study. Fonseca questionnaire was used to evaluate and classify the temporomandibular joint dysfunction. Temporomandibular joint range of motion was evaluated with a digital calliper, and masticatory muscles pressure pain threshold was evaluated with an algometer. Labial commissure angle measurement was used to evaluate the severity of facial paralysis. Complications related to traumatic brain injury were recorded in patients with traumatic brain injury.

RESULTS

According to Fonseca questionnaire score, 80% of traumatic brain injury patients and 16.7% of the control group had temporomandibular dysfunction (p < .001). In the intergroup comparison, a significant decrease was found in all temporomandibular range of motion and masticatory muscles pressure pain threshold parameters in favour of the traumatic brain injury group (p < .001). Labial commissure angle and Fonseca questionnaire scores were higher in the traumatic brain injury group (p < .001). The frequency of temporomandibular dysfunction was more common in traumatic brain injury patients with headache than in those without headache, as shown by the results of the Fonseca questionnaire (p = .044).

CONCLUSION

Compared to healthy controls, patients with traumatic brain injury experienced issues with the temporomandibular joint more frequently. Additionally, TBI patients with headaches had a greater frequency of temporomandibular joint dysfunction. Therefore, it is advised to check for temporomandibular joint dysfunction in traumatic brain injury patients during follow-up. In addition, the presence of headache in traumatic brain injury patients may be a stimulant for temporomandibular joint dysfunction.