Abstract
The purpose of this study was to observe the change of the position of the maxillary and mandibular permanent central incisors after emergence into the oral cavity as seen from the occlusal position.
Six-hundred and thirty seven dental casts were obtained from forty children, twenty one boys and nineteen girls, with normal occlusion. Casts were taken at six months before shedding of deciduous central incisors and were taken every 2 months during the first year after emergence of the central incisor.
The outlines of the central incisors from occlusal views of the casts were traced using five-fold magnification by means of a Nikon V-16A profile projector. Lines of reference were made among the distal contact points of both, right and left deciduous canines. Distances from the incisal edge to the line of reference and the 767angle formed of incisal edge with relation to the midline were measured and analyzed by computor.
