Table 4.
Characteristic features of third molar agenesis in the different groups according to the number of teeth absent.
| GROUPS (Total number of teeth absent) | 1Teeth Agenesis (47) | 2 Teeth Agenesis (50) | 3 Teeth Agenesis (18) | 4 Teeth Agenesis (60) | 3M Agenesisa (175) |
|---|---|---|---|---|---|
| Teeth | n (%) | ||||
| UR 3M | 19 (40.4) | 16 (64) | 4 (66.7) | 15 (100) | 54 (58.1) |
| UL 3M | 8 (17) | 15 (60) | 3 (50) | 15 (100) | 41 (44.1) |
| LL 3M | 11 (23.4) | 9 (36) | 6 (100) | 15 (100) | 41 (44.1) |
| LR 3M | 9 (19.1) | 10 (40) | 5 (83.3) | 15 (100) | 39 (4.1) |
| Laterality | Patients n (%) | ||||
| Unilateral | 47 (100) | 1 (4) | – | – | 48 (51.6) |
| Bilateral | – | 24 (96) | 6 (100) | 15 (100) | 45 (48.4) |
| Affected Side | Patients n (%) | ||||
| Right | 28 (59.6) | 1 (4) | – | – | 29 (31.2) |
| Left | 19 (40.4) | – | – | – | 19 (20.4) |
| Both (bilateral) | – | 24 (96) | 6 (100) | 6 (100) | 45 (48.4) |
| Affected Arch | Patients n (%) | ||||
| Maxilla | 27 (57.4) | 14 (56) | – | – | 41 (44.1) |
| Mandible | 20 (42.6) | 8 (32) | – | – | 28 (30.1) |
| Both | – | 3 (12) | 6 (100) | 15 (100) | 24 (25.8) |
| Skeletal Classification | Patients n (%) | ||||
| Class I* | 17 (36.2) | 12 (48) | 3 (50) | 8 (53.3) | 40 (43) |
| Class II* | 21 (44.7) | 10 (40) | 2 (33.3) | 2 (13.3) | 35 (37.6) |
| Class III* | 9 (19.1) | 3 (12) | 1 (16.7) | 5 (33.3) | 18 (19.4) |
| Growth Pattern | Patients n (%) | ||||
| Hypo-divergent* | 9 (19.1) | 4 (16) | 2 (33.3) | 5 (33.3) | 20 (21.5) |
| Normal* | 1 (2.1) | 4 (16) | – | 1 (6.7) | 6 (6.5) |
| Hyper-divergent* | 37 (78.7) | 17 (68) | 4 (66.7) | 9 (60) | 67 (72) |
UR means Upper Right.
UL means Upper Left.
LR means Lower Right.
LL means Lower Left.
a
3M indicates Third Molar.
*
Not statistically significant (p > 0.05).