The Gingival Index (GI) was developed by Loe and Silness to describe the clinical severity of gingival inflammation as well as its location.
slight change in color and mild edema with slight change in texture
redness, hypertrophy, edema and glazing
bleeding on probing/pressure
marked redness, hypertrophy, edema, ulceration
(1) maxillary right first molar
(2) maxillary right lateral incisor
(3) maxillary left first bicuspid
(4) mandibular left first molar
(5) mandibular left lateral incisor
(6) mandibular right first bicuspid
Surfaces examined on each tooth:
Gingival Index for a specific tooth =
= AVERAGE (points for the 4 surfaces)
Gingival Index for type of tooth (first molar, first bicuspid, lateral incisor) =
= AVERAGE (Gingival Indices for the 2 teeth)
gingival index for patient =
= AVERAGE (Gingival Indices for all 6 teeth)
Average Gingival Index
2.1 - 3.0
1.1 - 2.0
0.1 - 1.0
• Several subsequent modifications were made to better describe milder forms of inflammation or to eliminate the need to perform probing.
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