Age-related disruption of the lamina dura: Evidence in the mandibular horizontal incompletely impacted third molar

Figures & data

Table 1 No. of teeth with and without lamina dura

Age(y)	No. of teeth with lamina dura	No. of teeth without lamina dura	Total
Men
21–30	158 (94.0)	10 (6.0)	168
31–40	43 (75.4)	14 (24.6)	57
41–50	16 (43.2)	21 (56.8)	37
≥51	13 (39.4)	20 (60.6)	33
Total	230 (78.0)	65 (22.0)	295
Women
21–30	115 (95.8)	5 (4.2)	120
31–40	37 (78.7)	10 (21.3)	47
41–50	13 (68.4)	6 (31.6)	19
≥51	3 (27.3)	8 (72.7)	11
Total	168 (85.3)	29 (14.7)	197

Figure 1 Bilateral horizontal incompletely impacted third molars with lamina dura below the crown in a 36-year-old man.

Figure 2 Right horizontal incompletely impacted third molar without lamina dura below the crown in a 39-year-old woman.

Figure 3 Left horizontal incompletely impacted third molar without lamina dura below the crown in a 53-year-old woman.

Table 2 Lamina dura and status of bone and teeth on ipsilateral side in subjects older than 31 years

Men	With lamina dura (72 teeth)	Without lamina dura (55 teeth)	p
Bone resorption in the canine and the first molar	0.07 ± 0.09 (62 teeth)	0.09 ± 0.15 (42 teeth)	0.6
No. of teeth loss	30/504 teeth (6.0%)	42/385 teeth (10.9%)	<0.05
No. of teeth treated with metal repair	138/474 teeth (29.1%)	96/343 teeth (28.0%)	0.79
No. of decayed teeth	6/474 teeth (1.3%)	7/343 teeth (2.0%)	0.39
Women	With lamina dura (53 teeth)	Without lamina dura (24 teeth)	p
Bone resorption in the canine and the first molar	0.02 ± 0.06 (48 teeth)	0.05 ± 0.09 (22 teeth)	0.13
No. of teeth loss	14/371 teeth (3.8%)	3/168 teeth (1.8%)	0.23
No. of teeth treated with metal repair	148/357 teeth (41.5%)	61/165 teeth (37.0%)	0.52
No. of decayed teeth	5/357 teeth (1.4%)	2/165 teeth (1.2%)	0.86