OHI-S+Index

= OHI-S Index (Simplified Oral Hygiene Index) =

__Description:__
Stedman's Medical Dictionary states the an OHI-S is "an index that measures the current oral hygiene status based on the amount of debris and calculus occurring on six representative tooth surfaces in the mouth; often used in field surveys of periodontal disease". This index has very distinct differences between the OHI index and the OHI-S. The differences are with the number of tooth surfaces scored, which is 6 instead of 12; the way in which the teeth are selected; and the scores. This index incorporates both the Debris Index and Calculus Index.

The six teeth that are selected for this index consists of four posterior teeth which is the first completely erupted tooth distal to the second premolar. The buccal surfaces are scored on the maxilla and the lingual surfaces are scored on the mandible.The last two teeth selected and scored are the labial surfaces of the maxillary right central incisor (#8) and mandibular left central incisor (#24), but if one of these teeth are missing then #9 & #25 would be used for the index.

Scores For Classifying Debris:

presence of extrinsic stains without other debris regardless of surface area covered || of the exposed tooth surface. || surface. || two thirds of the exposed tooth surface or the presence of individual flecks of subgingival calculus around the cervical portion of the tooth or both. || surface or a continuos heavy band of subgingival calculus around the cervical portion of the tooth or both. ||
 * **Scores** || **Criteria** ||
 * 0 || No debris or stain present ||
 * 1 || Soft debris covering not more than one third of the tooth surface, or
 * 2 || Soft debris covering more than one third, but not more than two thirds,
 * 3 || Soft debris covering more than two thirds of the exposed tooth surface. ||
 * Scores For Classifying Calculus:**
 * **Scores** || **Criteria** ||
 * 0 || No calculus present ||
 * 1 || Supragingival calculus covering not more than third of the exposed tooth
 * 2 || Supragingival calculus covering more than one third but not more than
 * 3 || Supragingival calculus covering more than two third of the exposed tooth

__Category:__
Oral Hygiene

__When It Is Used:__
This is used to estimate the cleanliness of the tooth surfaces.

__How To Us It:__
Once the teeth are selected the index, the teeth are then recorded for the Plaque and Calculus Index with the appropriate scores. For example:
 * Plaque Index =** [(The buccal-scores) **+** (The lingual-scores)] **/** 6
 * Calculus Index =** [(The buccal-scores) **+** (The lingual-scores)] **/** 6



**Plaque Index =** [( 3+2+3+1 )**+**( 2+2 )] / 6 = 2.2 **Calculus Index =** [( 1+1+2 )**+**( 1+2 )] / 6 = 1.2

**OHI-S Index =** 2.2 **+** 1.2 = **3.4**


 * Suggested Range of Scores**


 * Debris Index & Calculus Index**
 * **Rating** || **Scores** ||
 * Excellent || 0 ||
 * Good || 0.1-0.6 ||
 * Fair || 0.7-1.8 ||
 * Poor || 1.9-3.0 ||
 * OHI-S**
 * **Rating** || **Scores** ||
 * Excellent || 0 ||
 * Good || 0.1-1.2 ||
 * Fair || 1.3-3.0 ||
 * Poor || 3.1-6.0 ||

__Reversible or Irreversible:__
Reversible