Table 1.
Comparison of clinical data between the alveolar nerve injured and uninjured groups.
| Variables | uninjured (n=157) | injured (n=15) | χ2/t | p | |
|---|---|---|---|---|---|
| Age (years) | 25.01±7.01 | 31.87±6.92 | -3.625 | <0.001 | |
| Sex (male) | 71 | 3 | 3.705 | 0.054 | |
| BMI (kg/m2) | 22.91±3.02 | 23.03±3.28 | -0.146 | 0.884 | |
| Number of tooth roots | single root | 113 | 11 | 0.013 | 0.911 |
| Multiple heel | 44 | 4 | |||
| Surgery time | 10.61±1.28 | 13.81±1.32 | -9.227 | <0.001 | |
| Whether the number of broken roots (pcs) | Yes | 2 | 5 | 38.835 | <0.001 |
| No | 155 | 9 | |||
| Mandibular canal morphology | Oval | 42 | 4 | 0.033 | 0.983 |
| Dumbbell-shaped | 66 | 6 | |||
| Teardrop shape | 49 | 5 | |||
| Direction of obstruction | Vertical obstruction | 23 | 3 | 0.653 | 0.721 |
| Sub-mid inclination | 110 | 9 | |||
| Horizontal obstruction | 24 | 3 | |||
| Obstruction angle | 0° | 19 | 1 | 4.911 | 0.178 |
| 10° | 28 | 2 | |||
| 40° | 50 | 9 | |||
| 70° | 60 | 3 | |||
| CEJ distance | 1-3mm | 9 | 1 | 3.914 | 0.418 |
| 4-6mm | 28 | 1 | |||
| 7-9mm | 57 | 9 | |||
| 10-12mm | 38 | 3 | |||
| >12mm | 25 | 1 | |||
| Blocking side | Right side | 81 | 5 | 1.826 | 0.177 |
| Left side | 76 | 10 | |||
| Whether the molar is curved root | Yes | 115 | 2 | 22.597 | <0.001 |
| No | 42 | 13 | |||
| Is the upper and lower wall of the neural canal clear? | Both upper and lower are clear | 33 | 12 | 25.758 | <0.001 |
| The upper wall is not clear, the lower wall is clear | 117 | 2 | |||
| Upper and lower walls are not clear | 7 | 1 | |||
| Pell and Gregory classification | High | 25 | 7 | 8.581 | 0.014 |
| Middle | 94 | 6 | |||
| Low | 38 | 2 | |||
| Hypoesthesia of the lower lip | - | 6 | - | - | |
| Numbness of the lower lip | - | 8 | - | - | |
| Abnormal pain in the lower lip | - | 7 | - | - | |
CEJ, cementoenamel junction