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Overview :
The Navy Plaque Index (NPI) was developed as part of the Navy
Periodontal Screening Examination, along with the Navy Periodontal Disease
Index. It reflects the plaque control status of the patient and emphasizes
plaque in the cervical portion of the tooth which is in contact with the gingiva
margins. Comparison of scores over time can help guide intervention to prevent
periodontal disease.
Teeth examined (US designation):
(1) 3
(2) 9
(3) 12
(4) 19
(5) 25
(6) 28
Substitutions:
• If 3, 12,
19 or 28 is missing, then substitute the next most posterior tooth.
• If 9 or
25 is missing, then substitute the nearest incisor in the arch. If all of the
incisors are missing from the arch. If all incisors are missing from the arch,
then substitute a cuspid.
Surfaces examined on each tooth:
(1) facial
(2) lingual
|
Plaque
Status |
Designated |
Points |
|
plaque in contact with gingival tissue on mesial
proximal surface |
M |
3 |
|
plaque in contact with gingival tissue on facial or
lingual surface |
G |
2 |
|
plaque in contact with gingival tissue on distal
proximal surface |
D |
3 |
|
plaque on facial or lingual surface of tooth surface
but not in contact with gingival tissue |
R |
1 |
For each tooth
facial points =
= (M points on facial aspect) + (G points on facial aspect) +
(D points on facial aspect) + (R points on facial aspect)
lingual points =
= (M points on lingual aspect) + (G points on lingual aspect)
+ (D points on lingual aspect) + (R points on lingual aspect)
Generating the
NPI
tooth score =
= (facial points) + (lingual points)
NPI score =
= MAX(all 6 tooth scores)
NPI total =
= SUM(all 6 tooth scores)
Interpretation:
• minimum score for a surface: 0
• maximum score for a surface: 9
• minimum tooth score: 0
• maximum tooth score: 18
• maximum NPI score: 18
• minimum NPI total: 0
• maximum NPI total: 108
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