Intra- and inter-rater agreement of a new classification system of gingival recession defects.

Abstract Several classification systems have been proposed in the literature, but none of them has been validated by means of an appropriate statistical analysis and, therefore, it is unknown whether these systems work in the same manner among different clinicians. The aim of the present study is to investigate the intra- and inter-rater agreement of a new system to classify gingival recession defects and to evaluate its agreement among different clinicians. A new classification system was proposed and tested considering the following three factors: the amount of keratinised tissue (