Interobserver variation in radiographic examination of endodontic variables

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Abstract
A study was made of the interobserver variation between 2 observers surveying a) the frequency and b) the technical standard of endodontic treatment. The material consisted of 20 sets of full‐mouth radiographs. Before the examination the observers were calibrated and strict criteria were defined. The agreement between the 2 observers was high for most of the variables studied and superior to that found in several previous investigations. While interobserver errors may be impossible to avoid in interpretation of endodontic treatment from dental radiographs, it is concluded that they may be reduced by calibration of observers and by establishing strict criteria for evaluation.