Malocclusion Class I:Neutrocclusion Here the molar relationship of the occlusion is normal or as described for the maxillary first molar,but the other teeth have problems like spacing, crowding,over or under eruption,etc. 1902Class I: Neutrocclusion Here the molar relationship of the occlusion is normal or as described for the maxillary first molar, but the other teeth have problems like spacing, crowding, over or under eruption, etc. Malocclusion