JKAOH Journal of Korean Academy of Oral Health

ISSN(Print) 1225-388X ISSN(Online) 2093-7784


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Original Article

Journal of Korean Academy of Oral Health 2017; 41(4): 262-266

Published online December 30, 2017 https://doi.org/10.11149/jkaoh.2017.41.4.262

Copyright © Journal of Korean Academy of Oral Health.

Comparison of traditional dental plaque indices with real stained plaque area

Ji-Soo Kim1,2, Yong-Hoon Yang1, Eun-Joo Jun1, Jin-Bom Kim1,2, Seung-Hwa Jeong1,2

1Department of Preventive and Community Dentistry, 2BK21 PLUS Project, School of Dentistry, Pusan National University, Yangsan, Korea

Received: September 26, 2017; Revised: November 7, 2017; Accepted: December 10, 2017


Objectives: The aim of this study was to compare Plaque Percent Index (PPI), calculated by Patient Hygiene Performance Index (PHPI), Rustogi’s modification of the Navy Plaque Index (RMNPI), and the Quigley & Hein Plaque Index (QHPI), with visual assessment. Methods: Ninety-six subjects, aged between 30-65 years, were examined; twenty subjects were included in the final analysis. The subjects’ teeth were stained and photographed. Dental coloring and intraoral camera photography were performed by a single examiner. The oral images obtained were analyzed using Image J to measure the area of dental plaque. The values of PHPI, RMNPI, and QHPI were calculated twice. Statistical analyses were performed using descriptive statistics, chi-square test, and Pearson’s correlation coefficient. Results: The results of the correlation analyses of PPI with PHPI, QHPI, and RMNPI were as follows: for PHPI, the correlation coefficient (r)=0.584; for QHPI, r=0.689; and for RMNPI, r=0.729. Further, the kappa indices of PHPI, QHPI, and RMNPI were 0.810, 0.677, and 0.590 respectively. Conclusions: Among RMNPI, QHPI, and PHPI dental plaque indices, RMNPI and QHPI showed a high degree of correlation with the actual stained dental plaque area; on the other hand, PHPI showed the highest kappa index.

Keywords: Dental plaque index, Intraoral camera, Plaque percent index