[Influence on the condyle position by decreasing posterior occlusal plane angle in Class II high angle cases]

Area of Science:

• Orthodontics
• Craniofacial Morphology
• Temporomandibular Joint (TMJ)

Background:

• Class II high angle malocclusions present complex treatment challenges.
• Altering the posterior occlusal plane is a potential strategy for managing these cases.
• Understanding condyle position changes is crucial for treatment outcomes.

Purpose of the Study:

• To investigate condyle position changes in Class II high angle cases.
• To assess the effect of decreasing the posterior occlusal plane angle.
• To correlate these changes with TMJ space alterations.

Main Methods:

• Fifteen Class II high angle patients (15-30 years) were treated.
• Multiloop Edgewise Archwire (MEAW) technique used to flatten the posterior occlusal plane.
• Cone-Beam Computed Tomography (CBCT) assessed TMJ spaces and posterior occlusal plane angle before and after treatment.

Main Results:

• Class II molar relationships improved to Class I, with enhanced facial profiles.
• Significant increases observed in posterior (0.88 mm) and superior (0.45 mm) TMJ spaces.
• Significant decrease in posterior occlusal plane angle (POP-SN and POP-FH).
• No significant correlation found between condyle position changes and posterior occlusal plane angle changes.

Conclusions:

• Decreasing the posterior occlusal plane angle is effective in Class II high angle orthodontic treatment.
• This approach can reposition the condyle to an anterior and inferior position.
• Significant TMJ space increases suggest favorable condylar adaptation.