[The relationship between centric relation-maximum intercuspation disharmony and temporomandibular dysfunction in...

Area of Science:

• Dental occlusion
• Temporomandibular joint disorders

Background:

• Class II malocclusion presents unique challenges in dental treatment.
• Understanding the relationship between jaw alignment and temporomandibular dysfunction (TMD) is crucial.

Purpose of the Study:

• To investigate the correlation between centric relation-maximum intercuspation (CR-MI) displacement and TMD in Class II patients.
• To determine if the degree of CR-MI displacement impacts TMD severity.

Main Methods:

• 107 Class II patients and students underwent clinical examination and questionnaires.
• The Helkimo index (Di and Ai) assessed TMD, while Condyle Position Indication (CPI) measured CR-MI displacement in three planes.

Main Results:

• Significant positive correlations were found between CR-MI displacement and TMD indicators (Di and Ai).
• Increased Di and Ai scores correlated with greater CR-MI displacement and discrepancy.
• TMD symptoms were significantly associated with CR-MI displacement and discrepancy, except in horizontal displacement.

Conclusions:

• The degree of CR-MI displacement is a significant factor in the development and severity of TMD in Class II patients.
• Clinicians should consider CR-MI discrepancies when assessing and managing TMD in this patient group.