## 3 Results
### Relationship between the IAN and the Mandibular Third Molar in CBCT  
In CBCT, 6283 cases (61%) of the inferior alveolar nerve were actually in contact with the root of the mandibular third molar, which was less than that in the case of panoramic \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Age** & **A (\%)** & **B (\%)** & **C (\%)** & **Total (\%)** & **\(p\) Value** & **Age** & **I (\%)** & **II (\%)** & **III (\%)** & **Total (\%)** & **\(p\) Value** \\ \hline
10–19 & 1243 & 459 & 177 & 1879 & & 10–19 & 173 & 1034 & 672 & 1879 & \\  & (66.2) & (24.4) & (9.4) & (100.0) & & & (9.2) & (55.0) & (35.8) & (100.0) & \\
20–29 & 3424 & 2157 & 481 & 6062 & & 20–29 & 646 & 3395 & 2021 & 6062 & \\  & (56.5) & (35.6) & (7.9) & (100.0) & & & (10.7) & (56.0) & (33.3) & (100.0) & \\
30–39 & 554 & 549 & 290 & 1393 & & 30–39 & 177 & 773 & 44 & 1393 & \\  & (39.8) & (39.4) & (20.8) & (100.0) & & & (12.7) & (55.5) & (31.8) & (100.0) & \\
40–49 & 174 & 242 & 204 & 620 & & 40–49 & 103 & 345 & 172 & 620 & \\  & (28.1) & (39.0) & (32.9) & (100.0) & \(p\) \(<\) 0.001 \({}^{*}\) & & & (16.6) & (55.6) & (27.7) & (100.0) & \(p\) \(<\) 0.001 \({}^{*}\) \\
50–59 & 66 & 63 & 96 & 225 & & 50–59 & 50 & 107 & 68 & 225 & \\  & (29.3) & (28.0) & (42.7) & (100.0) & & 50–59 & (22.2) & (47.6) & (30.2) & (100.0) & \\
60–69 & 39 & 27 & 32 & 33 (100.0) & & 60–69 & 40 & 36 & 22 & \\  & (39.8) & (27.6) & (32.7) & & & & (40.8) & (36.7) & (22.4) & \\
70–79 & 9 & 6 & 18 & & 33 (100.0) & & 70–79 & 15 & 14 & \\  & (27.3) & (18.1) & (54.5) & & & & (54.5) & (42.4) & \\ Total & 5509 & 3503 & 1298 & 10,310 & & Total & 1204 & 5704 & 3402 & 10,310 & \\  & (53.4) & (34.0) & (12.6) & (100.0) & & (11.7) & (55.3) & (33.0) & (100.0) & \\ \hline \hline \end{tabular} \({}^{*}\) Statistical significance \(p\) \(<\) 0.05, [PERSON]’s chi-square test.  
\end{table} 
Table 3: Age distribution of the Pell and Gregory classification. Figure 7: Distributions of panoramic signs: root darkening (30.2%), interruption of the inferior alveolar nerve (IAN) (24.7%), dark line of the root (16.2%), root deflection (9.6%), IAN diversion (5.1%), root narrowing (5.0%), and IAN Narrowing (3.7%). contact. Most often, the inferior alveolar nerve was located below the root of the mandibular third molar (60%). The second most frequent case of the inferior alveolar nerve was driving to the buccal side of the mandibular third molar (28%), driving to the lingual side (10%), and driving between the open roots (1%), followed by driving between the closed roots (0.4%). There were 10% of cases of the inferior alveolar nerve that appeared to be narrowed due to the roots (Table 4). It was found that there was a correlation between Pell and Gregory classification and the actual contact between the inferior alveolar nerve and the third molar in CBCT. In Class A, 52.4% were in contact with the inferior alveolar nerve and the third molar in CBCT, 69.4% in Class B, and 74.3% in Class C. In Class I, 46.9% were in contact with the inferior alveolar nerve and the third molar in CBCT; in Class II, 58.2%; and in Class III, 70.4% (Table 5). In addition, there was a correlation between the Pell and Gregory classification and CBCT when the inferior alveolar nerve was in contact with the third molar root and the inferior alveolar nerve was narrowed. In Class A, 52.4% were in contact with the inferior alveolar nerve and the mandibular third molar in CBCT, 69.4% in Class B, and 74.3% in Class C. In Class I, 46.9% were in contact with the inferior alveolar nerve and the mandibular third molar in CBCT, 58.2% in Class II, and 70.4% in Class III (Table 6). The correlation between the panoramic signs and the actual inferior alveolar nerve contact with the mandibular third molar was investigated using CBCT. Root darkening (\(p<0.001\)*), root deflection (\(p<0.001\)*), interruption of the IAN (\(p<0.001\)*), diversion of the IAN (\(p<0.001\)*), narrowing of the IAN (\(p<0.001\)*), and five other signs were analyzed as having significant correlations (Table 7).