The proposed charting method integrates the elements of the EAPD criteria and the modified index of developmental defects of enamel (mDDE index) for grading the clinical status of MIH and its extent on the involved tooth surface as well as other enamel defects. In order to take into account the varied needs and objectives of studies, two forms of the chart are proposed, a short form for simple screening surveys and a longer form for more detailed, community-based or clinic-based studies. In both forms, EAPD criteria emerged as the key elements reflecting the theme of charting. The short data set form is designed to grade only index teeth which have been mentioned in the definition of MIH and HSPM, namely first permanent molars, permanent incisors, and second primary molars (hereafter termed FPM, PI, and SPM, respectively).
Due to the available evidence on the involvement of other teeth with demarcated hypomineralisation defects (Suckling et al. 1989 (link); Kukleva et al. 2008 (link); Soviero et al. 2009 (link); Seow et al. 2011 (link); Leen 2013 ), the long data set form is formulated to diagnose all teeth at surface level available at the time of the dental examination in addition to MIH/HSPM-specific index teeth. However, the terms MIH and HSPM should not be applied to teeth other than FPM and PIs, and SPM, respectively. The following sections describe, in detail, definitions of terms used in the charting format, differential diagnosis of MIH from other enamel lesions, grading criteria and special considerations to be taken into account for the purpose of charting.