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Table 4 Evaluation of the prevalence of crowding presenting with orthodontic treatment (T1) and the initial Pell and Gregory classification (T0)

From: Correlational study of impacted and non-functional lower third molar position with occurrence of pathologies

  Dental crowding  
Variable Present Absent Total p value
  n % N % n %  
• Orthodontic treatment—T1
In implementation 6 100.0 6 100.0 p a = 0.039*
Completed without lingual retainer 5 55.6 4 44.4 9 100.0  
Completed with contention 1 12.5 7 87.5 8 100.0  
Not completed 1 50.0 1 50.0 2 100.0  
Not taken 1 100.0 1 100.0  
• Pell and Gregory—T0
IIB 3 21.4 11 78.6 14 100.0 p a = 0.039*
IIIB 4 66.7 2 33.3 6 100.0  
IC 6 100.0 6 100.0  
IIC 7 50.0 7 50.0 14 100.0  
  1. Obs.: Relative risk was not determined due to the occurrence of zero or very low frequencies
  2. n Number of teeth
  3. *Significant difference at 5 %
  4. aFisher’s exact test