Twenty-month follow-up of occlusal carious lesions deemed questionable at baseline: Findings from The National Dental Practice-Based Research Network

A questionable occlusal caries (QOC) lesion can be defined as an occlusal surface with no radiographic evidence of caries, but caries is suspected because of clinical appearance. In this study, the authors report the results of a 20-month follow-up of these lesions.