Number and ratio of screw holes located in each zone according to the position of arch (maxilla and mandible)
| Maxilla | Mandible | |
|---|---|---|
| Zone A | 109 | 121 |
| Zone B | 61 | 31 |
| Zone C | 36 | 34 |
| Total | 206 | 186 |
| Ratio of zone A | 0.529 | 0.651 |
| Ratio of zone B | 0.296 | 0.167 |
| Ratio of zone C | 0.175 | 0.183 |