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. 2023 Mar 18;27(6):3233–3244. doi: 10.1007/s00784-023-04938-y

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Fig. 5 — Kaplan–Meier function survival curves (a) comparing patients using (green line) or not using (blue line) the night guard, (b) comparing teeth with (green line) or without periapical radiolucency (blue line) and (c) comparing teeth with 1-3 mm PPD (blue line), 4-5 mm PPD (green line) and > 6 mm PPD (yellow line)