[Meta-analysis of the condylar position with mandibular deviation]

Area of Science:

• Orthodontics
• Dental Anatomy
• Biomechanical Analysis

Background:

• Mandibular deviation, a condition affecting jaw alignment, can impact temporomandibular joint (TMJ) function.
• Understanding condylar position is crucial for diagnosing and treating malocclusion and skeletal discrepancies.

Purpose of the Study:

• To analyze and compare the condylar position in individuals with mandibular deviation versus those with normal occlusion.
• To identify specific spatial differences of the condyle in the mandibular deviation group.

Main Methods:

• A systematic literature search was conducted across multiple databases (PubMed, Embase, CNKI, Wanfang, VIP, CBL) up to June 2017.
• Six controlled studies were included, involving 122 patients with mandibular deviation and 110 with normal occlusion.
• Meta-analysis was performed using Rev Man 5.3 software to evaluate condylar spatial relationships.

Main Results:

• In mandibular deviation, the deviation side showed significantly greater superior and anterior condylar spaces compared to the opposite side.
• The posterior condylar space was significantly smaller on the deviation side versus the opposite side.
• Compared to normal occlusion, the deviation side and opposite side posterior condylar spaces, and the opposite side anterior condylar space were significantly smaller in the mandibular deviation group.

Conclusions:

• The condylar position on the deviation side in patients with mandibular deviation is characterized by posterior and inferior displacement relative to the opposite side.
• The condylar position on the deviation side is posteriorly positioned when compared to individuals with normal occlusion.