Methods: An unmodified device, a conventional bitewing tab, and the four modified devices with horizontal angles of 2,6,11,and 23° were evaluated in two manikin-head skulls with two sets of radiographs. The radiographs were evaluated blindly via an adjusted Sewerin scale by two investigators.
Results: The bar at 2° angulation gave the best results with a mean score of 1.70. The film tab had a score of 1.80 and the unmodified film holder had a score of 2.74. There was no significant difference between the 2° bar and the film tab, but there was a significant difference between these two devices, the unmodified device, and the other bar angulated devices. A Sewerin score of 1 to 2 in indicates openings between the contacts were well visualized radiographically. A score of 4-5 indicates the contact was not opened.
Conclusions: The film holder with the 2° angled bar and film tab were superior to the other devices. The film tab is more dependent on the skill of the operator. Having a bar that contacts the buccal surface of the maxillary molar seems to standardize the horizontal angulation and the repeatability of the bitewing radiograph as compared to the unmodified device.
Keywords: Caries, Diagnosis, Periodontics, Radiology and Teeth
See more of: Periodontal Research - Diagnosis / Epidemiology