Correlation between mandibular third molar and mandibular incisor crowding: A retrospective CBCT-based study.

Area of Science:

• Dentistry
• Orthodontics
• Dental Imaging

Background:

• Late mandibular incisor crowding is a common issue in growing adults.
• The exact causes of this crowding remain debated and not fully understood.
• Investigating potential contributing factors is crucial for effective orthodontic treatment.

Purpose of the Study:

• To examine the relationship between mandibular third molars and mandibular incisor crowding.
• To utilize Cone-beam computed tomography (CBCT) for precise anatomical assessment.
• To provide evidence for the etiological factors of late incisor crowding.

Main Methods:

• A sample of 40 CBCT images were analyzed, divided into two groups: with and without mandibular third molars.
• Crowding was quantified using Little's irregularity index on axial views.
• Pearson's correlation test was employed for statistical analysis.

Main Results:

• A statistically significant positive correlation was observed between mandibular third molars and incisor crowding (P = 0.033).
• The mean irregularity index was higher in the group with third molars (6.799) compared to the group without (4.26).

Conclusions:

• The findings indicate a significant association between mandibular third molars and the development of late mandibular incisor crowding.
• This suggests that mandibular third molars may play a role in the etiology of incisor crowding.
• Further research can explore intervention strategies targeting third molars.