TABLE 4.
Distance in mm (mean and standard deviation) between the CEJ and most coronal canal bifurcation of mandibular incisor teeth included in the study using Ahmed et al. (13) classification
| Vertucci/Ahmed | Central | Lateral | |||
|---|---|---|---|---|---|
| n | Mean±SD | n | Mean±SD | pa | |
| III/1MI1–2–1 | 142 | 3.8±0.8 | 140 | 4.0±0.7 | 0.072 |
| Others (low frequency) | 17 | 4.0±1.9 | 12 | 3.9±1.9 | 0.752b |
| V/1MI1–2 | 7 | 5.8±1.2 | 5 | 5.7±1.4 | |
| VNC/1MI1–2–1–2–1 | 4 | 3.2±1.3 | 5 | 2.4±0.2 | |
| VNC/1MI1–2–1–2–1–2 | 4 | 2.7±1.2 | 2 | 2.9±1.0 | |
| VNC/1MI1–2–3–2–1 | 2 | 1.9±0.2 | – | – | |
a
: With procedure DESCRIPT (t-test) in SUDAAN 7.0, to account for clustering, i.e., multiple incisors per patient, b: Please, note that p-values are calculated only after collapsing all low-frequency categories. CEJ: Cemento-enamel junction