Bone formation without lamina dura in the middle-aged and elderly: possible dependence on enamel

Figures & data

Table 1 Number of teeth with and without a lamina dura and radiolucency

Age (y.)	No of teeth with lamina dura without radiolucency	No of teeth without lamina dura with radiolucency	No of teeth without lamina dura without radiolucency	Total
Men
31–40	33	6	4	43
41–50	13	1	15	29
≥51	12	5	15	32
Total	58	12	34	104
Women
31–40	29	6	4	39
41–50	11	0	6	17
≥51	3	2	6	11
Total	43	8	16	67

Figure 1 Right horizontal incompletely impacted third molar with lamina dura without radiolucency below the crown in a 38-year-old woman.

Figure 2 Left horizontal incompletely impacted third molar without lamina dura with radiolucency below the crown in a 51-year-old man.

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

Table 2 Lamina dura and radiolucency and status of bone and teeth on ipsilateral side

Men	With lamina dura without radiolucency (58 teeth)	Without lamina dura with radiolucency (12 teeth)	Without both lamina dura and radiolucency (34 teeth)
Age (y.)	42.76 ± 10.48 (58)a,b	51.92 ± 19.33 (12)a	53.06 ± 12.68 (34)b
Bone resorption in the canine and first molar	0.08 ± 0.09 (49)	0.17 ± 0.28 (8)	0.07 ± 0.08 (28)
No of teeth loss	25/406 (6.2%)c	20/84 (23.8%)c,d	17/238 (7.1%)d
No of teeth treated with metal repair	115/381 (30.2%)	16/68 (23.5%)	65/221 (29.4%)
No of decayed teeth	6/381 (1.6%)	1/68 (1.5%)	4/221 (1.8%)
Women	With lamina dura without radiolucency (43 teeth)	Without lamina dura with radiolucency (8 teeth)	Without both lamina dura and radiolucency (16 teeth)
Age (y.)	39.49 ± 8.37 (43)e	41.25 ± 10.38 (8)	46.69 ± 9.35 (16)e
Bone resorption in the canine and first molar	0.02 ± 0.06 (39)	0.04 ± 0.07 (7)	0.02 ± 0,07 (16)
No of teeth loss	14/301 (4.7%)	1/56 (1.8%)	2/112 (1.8%)
No of teeth treated with metal repair	114/287 (39.7%)	19/55 (34.5%)	42/110 (38.2%)
No of decayed teeth	5/287 (1.7%)	1/55 (1.8%)	2/110 (1.8%)

a P < 0.05,

b, d P < 0.0001,

c P < 0.00001,

e P < 0.01