The prevalence of clinically undetected occlusal dentine caries was determined in a group of adolescents living on the Isle of Wight by comparing data from clinical and radiographic examinations carried out in 1987. 6.3% of maxillary molars and 12.9% of mandibular molars which had been designated as clinically sound showed dentine caries on radiographs. Comparison of the radiographic data from 1975 and 1987 showed that there were more sound and fewer filled occlusal surfaces in 1987, but more primary occlusal caries. Approximately 50% of subjects examined in both 1975 and 1987 had at least one molar tooth with primary and/or secondary caries in dentine on radiograph.
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