| Control restoration | Hall PMC | ||
---|---|---|---|---|
 | Criteria | Number of teeth | Criteria | Number of teeth |
Clinical and radiographic 'Minor' failure | Filling lost; tooth restorable | 26 | PMC lost; tooth restorable | 1 |
 | Secondary caries or new caries | 23 | Secondary caries or new caries | 1* |
 | Filling worn | 5 | Hall PMC worn through | 1 |
 |  |  | Impacted first permanent molar | 1 |
Radiographic 'Minor' failure alone | caries progression visible on radiographs | 3 | caries progression visible on radiographs | 2** |
Total | Â | 57 | Â | 6 |