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Table 3 Lateral incisor measurements from axial and sagittal sections

From: Three-dimensional evaluation of root dimensions and alveolar ridge width of maxillary lateral incisors in patients with unilateral agenesis

  Group Mean SD 25th percentile 50th percentile 75th percentile p
Axial method
 Labiopalatal root width (mm)
  At CEJ MLIA 5.86 0.71 5.60 5.90 6.10 <0.0001*
Control 7.24 0.43 6.90 7.20 7.65
  4 mm apical to CEJ MLIA 4.99 0.64 4.60 4.99 5.50 <0.0001*
Control 5.97 0.43 5.50 6.05 6.25
  8 mm apical to CEJ MLIA 4.06 0.69 3.50 4.00 4.60 0.009*
Control 4.86 0.65 4.30 4.65 5.50
 Mesiodistal root width (mm)
  At CEJ MLIA 4.91 0.31 4.70 4.90 5.20 <0.0001*
Control 5.66 0.54 5.30 5.55 6.15
  4 mm apical to CEJ MLIA 3.86 0.42 3.50 3.80 4.30 0.003*
Control 4.57 0.69 4.05 4.55 4.95
  8 mm apical to CEJ MLIA 3.15 0.42 2.80 3.00 3.30 0.092
Control 3.57 0.68 2.95 3.30 4.20
Sagittal method
 Labiopalatal root width (mm)
  At CEJ MLIA 5.94 0.72 5.60 5.90 6.30 <0.0001*
Control 7.21 0.40 6.90 7.20 7.55
  4 mm apical to CEJ MLIA 5.01 0.63 4.60 5.00 5.60 <0.0001*
Control 5.94 0.42 5.55 5.85 6.35
  8 mm apical to CEJ MLIA 4.12 0.70 3.50 4.30 4.60 0.018
Control 4.87 0.67 4.45 4.80 5.60
 Mesiodistal root width (mm)
  At CEJ MLIA 4.85 0.27 4.60 4.90 5.00 <0.0001*
Control 5.74 0.52 5.35 5.70 6.20
  4 mm apical to CEJ MLIA 3.83 0.43 3.50 3.60 4.20 0.003*
Control 4.53 0.67 3.95 4.50 5.00
  8 mm apical to CEJ MLIA 3.06 0.43 2.70 3.00 3.30 0.05
  Control 3.53 0.67 2.90 3.30 4.10  
Width at incisal edge (IE, mm) MLIA 4.40 0.82 3.90 4.40 4.90 <0.0001*
Control 6.16 0.51 5.90 6.00 6.60  
Width at midpoint (mm) MLIA 5.45 0.95 5.20 5.60 5.90 <0.0001*
Control 7.00 0.23 6.75 7.05 7.20  
  1. Since three distance points from CEJ were used to examine the outcomes, in order to minimize type 1 errors arising from multiple outcome assessments (at CEJ, 4 mm apical to CEJ, and 8 mm apical to CEJ), adjustments (based on Bonferroni formula) were made to p values to be deemed statistically significant. A p value of <0.017 was deemed to be statistically significant
  2. *p value is statistically significant at p < 0.017