Abstract
The growth of the dentocraniofacial structures of 13 Japanese girls was investigated during two year and six month (2 1/2 year) periods by using 39 lateral cephalograms of the deciduous dentition. At the first visit their deciduous incisors were reversely occluded, and when their permanent lower incisors erupted, they were reversely occluded also.
Results:
1. On the axis of cordinates based on the sella turcia, all of the measurements except the orbitale changed significantly in height, but none of the measurements except the nasion and lower permanent incisor changed significantly in depth.
2. The permanent interincisor angle and the lower incisor angle to the mandibular plane changed significantly in eighteen angular measurements, but the other measurements did not change significantly.
3. In eight linear measurements, the length of the anterior cranial bone and the mandibular ramus height did not change significantly, but the other measurements increased significantly. The total mandibular length, anterior facial height, and mandibular body length showed significant increase compared to the maxilla bone length, facial depth and mandibular ramous height respectively.
4. The variance of growth change between the deciduous dentition completion period and the lower incisor eruption period was not significant in most items except in the permanent incisor. Most of the permanent upper and lower central incisors decreased once in angle before the eruption, and then it increased during eruption.
Conclusion:
In the growth of dentocraniofacial structures of Japanese girls over a period of 2 1/2 years in deciduous reversed occlusion, angular measurements did not change significantly and the facial height grew more than the depth. However the direction and amount of growth did not change in the meantime.
