Background: Inadequate detection of caries in the primary dentition due to non-use of bitewing radiography is commonly encountered in paediatric practice. The present study investigated the increased benefits of using bitewing radiography in addition to the visual-tactile examination technique for detection of primary dentition caries in a non-fluoridated community, and determined the prevalence of "hidden" occlusal caries in the primary dentition.
Methods: Primary teeth were scored for caries at the restorative threshold using a visual-tactile technique followed by bitewing radiographic examination in a sample of 611 schoolchildren aged 6.4 +/- 0.5 yrs to 12.1 +/- 0.8 yrs residing in a non-fluoridated city.
Results: Overall, at the restorative threshold, the visual-tactile technique could detect 62 per cent of occlusal caries compared to 74 per cent for bitewing radiography (p < 0.001). The prevalence of "hidden" occlusal caries was 12 per cent. In contrast, for primary molar proximal surface caries, the visual-tactile technique could detect only 43 per cent of caries compared with 91 per cent for bitewing radiography (p < 0.001).
Conclusions: In the primary dentition, use of bitewing radiography increases the detection rate of proximal surface caries substantially. It is recommended that bitewing radiography be included as part of the routine examination of children with proximal surfaces that cannot be visualized.
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