Table 2 General description of the included studies

Median (range) 53.7 (38–73)/52.2 (35–70)

Median (range) 64.5 (44–76)/42 (29–79)

18/18

16/16

10/26

14/18

56/60

56/50

Clinical and histopathological criteria of OLP according to the modified WHO diagnostic criteria of OLP

OLP was diagnosed based on a thorough clinical examination and histopathology of the lesions

The presence of PIM (BOP, PD ≥ 4 mm and no BL) and PI (BOP or pus, BL ≥ 3 threads at the final examination)

Diagnosis of PIDs based on clinical indicators (e.g. CAL, PD, BL)

Median (IR): 56.5 (22)/52.5 (22.7)

Median (range): 42 (12–120)/48 (24–48)

PD (mm): n:< 4 mm 23/18; ≥4 mm 33/42

PD (mm): median (range): 3.00 (1.12–4.90)/3.00 (2–5)

(sites): 105/114; (implants): 36/44; patients: 13/16

(No. implants): 12/11

BL (mm): ≤1.7 18/22; 1.8–2.4 24/24; 2.5–3 8/9; 3.1–3.6 4/3; ≥3.7:2/2

(No. of implants): 10/8;

12/16

10/9

5/4

14/8

Smoking

Age, sex, smoking, alcohol consumption, frequency of tooth brushing

Lichen planus was not a prominent local factor in the genesis of implant failure.

Implants did not influence manifestations of OLP. OLP was not a risk factor for peri-implantitis.

_

1.32 (PI)

_

0.81–2.14 (PI)

.254 (PI)/.985 (PIM)

.257 (PI)