Table 4.
Number and percentages of the dental students taking the periapical radiographs at three horizontal angulations with the aids of an extension cone paralleling (XCP) holder or an angulation-adjustable holder until obtaining no cone-cutting error.
| Frequency ofradiography | XCP holder |
Angulation-adjustable holder |
||||
|---|---|---|---|---|---|---|
| Right angle | 20° mesial | 20° distal | Right angle | 20° mesial | 20° distal | |
| Once | 40 (97.6%) | 23 (56.1%) | 11 (26.8%) | 41 (100%) | 41 (100%) | 41 (100%) |
| Twice | 1 (2.4%) | 14 (34.2%) | 6 (14.6%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Thrice | 0 (0%) | 3 (7.3%) | 11 (26.8%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Four times | 0 (0%) | 1 (2.4%) | 5 (12.2%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Five times | 0 (0%) | 0 (0%) | 5 (12.2%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Six times | 0 (0%) | 0 (0%) | 1 (2.4%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Seven times | 0 (0%) | 0 (0%) | 2 (4.9%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Total | 41 (100%) | 41 (100%) | 41 (100%) | 41 (100%) | 41 (100%) | 41 (100%) |
| Retaking | 1 (2.4%) | 18 (43.9%) | 30 (73.2%) | 0 (0%) | 0 (0%) | 0 (0%) |