|  |  | Follow-up radiographs | |||
---|---|---|---|---|---|---|
Category | Criteria | Control restoration | Hall PMC | |||
 |  |  | number | % | number | % |
Exposure/developing | good contrast between enamel/dentine | 0 | 165 | 78 | 180 | 85 |
 | poor contrast, but useable | 1 | 40 | 19 | 26 | 12 |
 | only useable to confirm presence or absence of teeth or PMC | 2 | 5 | 2 | 5 | 2 |
 | teeth not visible/unusable | 9 | 1 | 1 | 0 | 0 |
Total | Â | Â | 211 | Â | 211 | Â |
Visibility of study tooth crown | whole crown visible, no overlaps | 0 | 133 | 63 | 188 | 89 |
 | overlaps confined to enamel | 1 | 58 | 28 | 7 | 3 |
 | significant overlap | 2 | 3 | 1 | 1 | 1 |
 | carious lesion visible, but part of crown off-film | 3 | 14 | 7 | 14 | 7 |
 | crown not visible/unusable | 9 | 3 | 1 | 1 | 1 |
Total | Â | Â | 211 | Â | 211 | Â |
Visibility of study tooth furcation area | furcation area visible | 0 | 174 | 83 | 133 | 63 |
 | furcation area partially visible | 1 | 12 | 6 | 14 | 7 |
 | furcation not visible/not usable | 9 | 25 | 12 | 64 | 30 |
Total | Â | Â | 211 | Â | 211 | Â |