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Questions and Answers
Which surfaces of the maxillary molars are scored in the Posterior region for the Simplified Oral Hygiene Index?
Which surfaces of the maxillary molars are scored in the Posterior region for the Simplified Oral Hygiene Index?
- Facial surfaces (correct)
- Lingual surfaces
- Mesial surfaces
- Occlusal surfaces
Which surfaces of the mandibular molars are scored in the Posterior region?
Which surfaces of the mandibular molars are scored in the Posterior region?
- Facial surfaces
- Lingual surfaces (correct)
- Occlusal surfaces
- Distal surfaces
If the first molar is missing in the posterior region, which tooth is used for the Simplified Oral Hygiene Index?
If the first molar is missing in the posterior region, which tooth is used for the Simplified Oral Hygiene Index?
- Canine
- Second molar (correct)
- First premolar
- Second premolar
Which tooth surfaces are scored in the anterior region for the Simplified Oral Hygiene Index?
Which tooth surfaces are scored in the anterior region for the Simplified Oral Hygiene Index?
If the maxillary right central incisor is missing, which tooth is scored instead?
If the maxillary right central incisor is missing, which tooth is scored instead?
Which area of the selected teeth is scored for the Simplified Oral Hygiene Index?
Which area of the selected teeth is scored for the Simplified Oral Hygiene Index?
What is the minimum number of surfaces that must be examined to calculate an individual score for the Simplified Oral Hygiene Index?
What is the minimum number of surfaces that must be examined to calculate an individual score for the Simplified Oral Hygiene Index?
What is oral debris defined as?
What is oral debris defined as?
How is the surface area covered by debris estimated during the examination?
How is the surface area covered by debris estimated during the examination?
What does a debris score of '0' indicate?
What does a debris score of '0' indicate?
According to the Simplified Debris Index (DI-S), what does a score of '1' indicate?
According to the Simplified Debris Index (DI-S), what does a score of '1' indicate?
What does a debris score of '3' indicate according to the Simplified Debris Index?
What does a debris score of '3' indicate according to the Simplified Debris Index?
How is supragingival calculus detected during the Simplified Oral Hygiene Index examination?
How is supragingival calculus detected during the Simplified Oral Hygiene Index examination?
How are subgingival calculus deposits identified during the examination?
How are subgingival calculus deposits identified during the examination?
What does a calculus score of '0' indicate?
What does a calculus score of '0' indicate?
What does a calculus score of '1' indicate according to the Simplified Calculus Index (CI-S)?
What does a calculus score of '1' indicate according to the Simplified Calculus Index (CI-S)?
How is the OHI-S individual score calculated?
How is the OHI-S individual score calculated?
What is the range of possible values for the DI-S and CI-S?
What is the range of possible values for the DI-S and CI-S?
What is the range of possible values for the OHI-S?
What is the range of possible values for the OHI-S?
According to the suggested range of scores, what OHI-S score is considered 'Excellent'?
According to the suggested range of scores, what OHI-S score is considered 'Excellent'?
What range of OHI-S scores is considered 'Good'?
What range of OHI-S scores is considered 'Good'?
What range of OHI-S scores indicates 'Poor' oral hygiene?
What range of OHI-S scores indicates 'Poor' oral hygiene?
Flashcards
Oral Debris
Oral Debris
Oral debris is soft foreign matter like dental biofilm, material alba, and food debris found on tooth surfaces.
Simplified Debris Index (DI-S)
Simplified Debris Index (DI-S)
The Simplified Debris Index (DI-S) measures the amount of soft debris on selected tooth surfaces.
DI-S Score of 0
DI-S Score of 0
A DI-S score of 0 indicates no debris or stain is present on the tooth surface.
DI-S Score of 1
DI-S Score of 1
A DI-S score of 1 means soft debris covers up to one-third of the tooth surface, or there are extrinsic stains without debris.
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DI-S Score of 2
DI-S Score of 2
A DI-S score of 2 indicates soft debris covering more than one-third but not more than two-thirds of the tooth surface.
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DI-S Score of 3
DI-S Score of 3
A DI-S score of 3 means soft debris covers more than two-thirds of the exposed tooth surface.
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Simplified Calculus Index (CI-S)
Simplified Calculus Index (CI-S)
The Simplified Calculus Index (CI-S) assesses the amount of supragingival and subgingival calculus on selected tooth surfaces.
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CI-S Score of 0
CI-S Score of 0
A CI-S score of 0 indicates no calculus is present on the tooth surface.
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CI-S Score of 1
CI-S Score of 1
A CI-S score of 1 means supragingival calculus covers up to one-third of the exposed tooth surface.
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CI-S Score of 2
CI-S Score of 2
A CI-S score of 2 indicates supragingival calculus covering more than one-third but not more than two-thirds of the tooth surface, or flecks of subgingival calculus.
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CI-S Score of 3
CI-S Score of 3
A CI-S score of 3 means supragingival calculus covers more than two-thirds of the exposed tooth surface, or a continuous heavy band of subgingival calculus is present.
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Calculating DI-S and CI-S
Calculating DI-S and CI-S
To calculate individual DI-S and CI-S scores, divide the total score by the number of teeth scored (which is 6).
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OHI-S Calculation
OHI-S Calculation
The OHI-S is calculated by combining the DI-S and CI-S scores.
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Good OHI-S Score
Good OHI-S Score
An OHI-S score between 0.1 and 1.2 is considered good.
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What is OHI-S?
What is OHI-S?
The OHI-S is an index used to measure oral hygiene status, by combining both debris and calculus scores.
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OHI-S Score: Good
OHI-S Score: Good
An OHI-S (combined DI-S and CI-S) score of 0.1–1.2 is considered good.
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Posterior Teeth Selection (OHI-S)
Posterior Teeth Selection (OHI-S)
Posterior teeth used in the Simplified Oral Hygiene Index are facial surfaces of maxillary molars and lingual surfaces of mandibular molars
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Anterior Teeth Selection (OHI-S)
Anterior Teeth Selection (OHI-S)
Anterior teeth used for OHI-S are the facial surfaces of the maxillary right and mandibular left central incisors.
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OHI-S Qualification
OHI-S Qualification
In OHI-S, at least two of the six possible tooth surfaces must be examined to calculate a score.
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Composition of Oral Debris
Composition of Oral Debris
Oral debris includes soft foreign matter like dental biofilm, material alba, and food debris.
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- Simplified Oral Hygiene Index (OHI-S) scores facial surfaces of maxillary molars and lingual surfaces of mandibular molars in the posterior region
- Typically first molars are examined, but if missing, the first fully erupted molar distal to the second premolar is used
- In the anterior region, facial surfaces of the maxillary right and mandibular left central incisors are scored
- If a central incisor is missing, the adjacent central incisor is scored
- Scoring includes the facial or lingual surfaces of selected teeth and proximal surfaces up to the contact areas
- At least two of the six possible surfaces must be examined to calculate an individual score
- Oral debris includes soft foreign matter like dental biofilm, materia alba, and food debris
- A probe or explorer estimates the surface area covered by debris
Simplified Debris Index (DI-S) Criteria
- Score 0: No debris or stain present
- Score 1: Soft debris covering ≤1/3 of the tooth surface or extrinsic stains without debris
- Score 2: Soft debris covering >1/3 but ≤2/3 of the exposed tooth surface
- Score 3: Soft debris covering >2/3 of the exposed tooth surface
- Calculus is evaluated by using an explorer to estimate the surface area covered by supragingival deposits and by exploring/probing for subgingival deposits
- Scoring is based on location and tooth surface area covered
Simplified Calculus Index (CI-S) Criteria
- Score 0: No calculus present
- Score 1: Supragingival calculus covering ≤1/3 of the exposed tooth surface
- Score 2: Supragingival calculus covering >1/3 but ≤2/3 of the exposed tooth surface or individual flecks of subgingival calculus around the cervical portion of the tooth
- Score 3: Supragingival calculus covering >2/3 of the exposed tooth surface or a continuous heavy band of subgingival calculus around the cervical portion of the tooth
OHI-S Individual Score Calculation
- Determine separate DI-S and CI-S scores
- Divide each total score by the number of teeth scored (6)
- DI-S and CI-S values range from 0 to 3
- Combine the DI-S and CI-S to calculate the OHI-S
- OHI-S value ranges from 0 to 6
Range of Scores for Evaluation: DI-S and CI-S
- Excellent: 0
- Good: 0.1–0.6
- Fair: 0.7–1.8
- Poor: 1.9–3.0
Range of Scores for Evaluation: OHI-S
- Excellent: 0
- Good: 0.1–1.2
- Fair: 1.3–3.0
- Poor: 3.1–6.0
OHI-S Group Score
- Compute the average of the individual scores by totaling the scores and dividing by the number of individuals
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