Table 2.
Relationship of the variables between DPR and CBCT images
| |
Variables for DPR images |
Total |
Chi-square |
P value |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Variables for CBCT images | Interruption in white line of IAC | Diversion of IAC | Narrowing of IAC | Darkening of roots | Other | |||||
|
Types of IMTM |
Type A |
n |
41 |
8 |
8 |
40 |
5 |
102 |
10.4783 |
0.233 |
| |
% |
40.2 |
7.8 |
7.8 |
39.2 |
4.9 |
100.0 |
|
|
|
|
Type B |
n |
32 |
5 |
11 |
20 |
2 |
70 |
|
|
|
| |
% |
45.71 |
7.14 |
15.71 |
28.57 |
2.86 |
100.00 |
|
|
|
|
Type C |
n |
38 |
12 |
13 |
59 |
4 |
126 |
|
|
|
| |
% |
30.16 |
9.52 |
10.32 |
46.83 |
3.17 |
100.00 |
|
|
|
|
Total |
n |
111 |
25 |
32 |
119 |
11 |
298 |
|
|
|
| |
% |
37.25 |
8.39 |
10.74 |
39.93 |
3.69 |
100.00 |
|
|
|
|
Buccolingual relationship of IAC-IMTM |
Buccal |
n |
21 |
2 |
4 |
21 |
1 |
49 |
11.351 |
0.499 |
| |
|
% |
42.9 |
4.1 |
8.2 |
42.9 |
2.0 |
100.0% |
|
|
| |
Lingual |
n |
68 |
16 |
22 |
80 |
9 |
195 |
|
|
| |
|
% |
34.9 |
8.2 |
11.3 |
41.0 |
4.6 |
100.0% |
|
|
| |
Interradicular |
n |
5 |
0 |
1 |
7 |
0 |
13 |
|
|
| |
|
% |
38.5 |
0.0 |
7.7 |
53.8 |
0.0 |
100.0% |
|
|
| |
Inferior |
n |
17 |
7 |
5 |
11 |
1 |
41 |
|
|
| |
|
% |
41.5 |
17.1 |
12.2 |
26.8 |
2.4 |
100.0% |
|
|
| |
Total |
n |
111 |
25 |
32 |
119 |
11 |
298 |
|
|
| |
|
% |
37.2 |
8.4 |
10.7 |
39.9 |
3.7 |
100.0% |
|
|
|
Position of IAC-IMTM |
Contact |
n |
61 |
23 |
27 |
101 |
1 |
213 |
54.113 |
0.000* |
| |
% |
28.6 |
10.8 |
12.7 |
47.4 |
0.5 |
100.0% |
|
|
|
|
No contact |
n |
50 |
2 |
5 |
18 |
10 |
85 |
|
|
|
| |
% |
58.8 |
2.4 |
5.9 |
21.2 |
11.8 |
100.0% |
|
|
|
|
Total |
n |
111 |
25 |
32 |
119 |
11 |
298 |
|
|
|
| |
% |
37.2 |
8.4 |
10.7 |
39.9 |
3.7 |
100.0% |
|
|
|
|
Mandible shape |
Type 1 |
n |
46 |
13 |
15 |
62 |
1 |
137 |
13.720 |
0.089 |
| |
|
% |
33.6 |
9.5 |
10.9 |
45.3 |
0.7 |
100.0% |
|
|
| |
Type 2 |
n |
13 |
1 |
4 |
5 |
1 |
24 |
|
|
| |
|
% |
54.2 |
4.2 |
16.7 |
20.8 |
4.2 |
100.0% |
|
|
| |
Type 3 |
n |
52 |
11 |
13 |
52 |
9 |
137 |
|
|
| |
|
% |
38.0 |
8.0 |
9.5 |
38.0 |
6.6 |
100.0% |
|
|
| |
Total |
n |
111 |
25 |
32 |
119 |
11 |
298 |
|
|
| % | 37.2 | 8.4 | 10.7 | 39.9 | 3.7 | 100.0% | ||||
DPR: Digital panoramic radiography.
CBCT: Cone-beam computed tomography.
IAC: Inferior alveolar canal.
IMTM: Impacted mandibular third molar.
*Statistically significant difference p < 0.05.