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. 2021 May 31;51(4):276–284. doi: 10.5051/jpis.2007080354

Figure 1. Measurements of RC, RP and total subgingival root area in maxillary first molar. Total subgingival root area is calculated as the area between orange lines, RC circled with white line, and RP enclosed in blue lines.

Figure 1

N: notch, RC: residual calculus, RP: residual plaque, PDL: periodontal ligament.