Use and quality of bitewing films in private dental offices.

Patient records (387) were obtained from twenty-five dentists in private practice in Rochester, New York. The number and types of radiographs taken at each recall examination in the most recent 10-year period were recorded. Bitewing radiographs were taken at 50.5% of the recalls with size 2 film used most frequently (83.7%). The average recall interval was 8.4 months overall and 18.0 months for bitewing recalls. Of all proximal surfaces available on the bitewing films, 68.2% were judged adequately separated for diagnostic purposes. For individual surfaces, the highest percentages were recorded for the mesial surface of the maxillary second premolar (89.9%) in the permanent dentition and for the distal surface of the mandibular second molar (83.7%) in the deciduous dentition. Taking four bitewing films instead of two improved the percentage of adequately separated proximal surfaces at a given recall by 2% to 25%. The percentage of unreadable proximal surfaces caused by overlapping or distortion on the bitewing radiographs, when excluding the canines, ranged from 6.3% to 39.5% in the permanent dentition and from 12.5% to 24.9% in the deciduous dentition.