Plaque score conversion table
Modified plaque score
The modified plaque score is determined from the index teeth total score using the following equation:
$$ \text{% score} = { \text{total score} \times 100 \over \text{number of index teeth used} \times 6 \text{*}}$$
*the maximum total plaque score per tooth
The table below can be used to quickly determine a modified plaque score (in percentage) from the index teeth total score.
The conversion from total score to modified plaque score in each column is based on the number of index teeth used to determine the total score. Where scores from all six index teeth (or appropriate substitutes) are combined to determine the total score, the column titled 6 should be used. Similarly, if only five teeth are scored, the column titled 5 should be used, and so on.
| Total score recorded from index teeth | Modified plaque score | |||||
| Number of of index teeth used | ||||||
| 6 | 5 | 4 | 3 | 2 | 1 | |
| 1 | 3% | 3% | 4% | 6% | 8% | 17% |
| 2 | 5% | 7% | 8% | 11% | 17% | 33% |
| 3 | 8% | 10% | 13% | 17% | 25% | 50% |
| 4 | 11% | 13% | 17% | 22% | 33% | 67% |
| 5 | 14% | 17% | 21% | 28% | 42% | 83% |
| 6 | 17% | 20% | 25% | 33% | 50% | 100% |
| 7 | 19% | 23% | 29% | 39% | 58% | - |
| 8 | 22% | 27% | 33% | 44% | 67% | - |
| 9 | 25% | 30% | 38% | 50% | 75% | - |
| 10 | 28% | 33% | 42% | 56% | 83% | - |
| 11 | 30% | 37% | 47% | 61% | 92% | - |
| 12 | 33% | 40% | 50% | 67% | 100% | - |
| 13 | 36% | 43% | 54% | 72% | - | - |
| 14 | 39% | 47% | 58% | 78% | - | - |
| 15 | 42% | 50% | 63% | 83% | - | - |
| 16 | 44% | 53% | 67% | 89% | - | - |
| 17 | 47% | 57% | 71% | 94% | - | - |
| 18 | 50% | 60% | 75% | 100% | - | - |
| 19 | 53% | 63% | 79% | - | - | - |
| 20 | 56% | 67% | 83% | - | - | - |
| 21 | 58% | 70% | 88% | - | - | - |
| 22 | 61% | 73% | 92% | - | - | - |
| 23 | 64% | 77% | 97% | - | - | - |
| 24 | 67% | 80% | 100% | - | - | - |
| 25 | 69% | 83% | - | - | - | - |
| 26 | 72% | 87% | - | - | - | - |
| 27 | 75% | 90% | - | - | - | - |
| 28 | 78% | 93% | - | - | - | - |
| 29 | 81% | 97% | - | - | - | - |
| 30 | 83% | 100% | - | - | - | - |
| 31 | 86% | - | - | - | - | - |
| 32 | 89% | - | - | - | - | - |
| 33 | 92% | - | - | - | - | - |
| 34 | 94% | - | - | - | - | - |
| 35 | 97% | - | - | - | - | - |
| 36 | 100% | - | - | - | - | - |