The displacement of cranial base landmarks during adolescent growth spurt in male and a comparison of three superimposition methods
SU Li, LU Ying. Department of Orthodontics, Faculty of Stomatology, Capital University of Medical Sciences, Beijing 100050, China
Objective To analyze the amount and direction of displacement of reference landmarks located on the cranial base during adolescent growth spurt in males, and to compare the results of superimposition method of stable bone structure of the anterior cranial base with Steiner method and Ricketts method in assessing mandibular position. Methods The sample consisted of 25 growing males with skeletal Class I malocclusion. The lateral cephalograms before and after treatment were measured by using the three different superimposition methods. Results The horizontal and vertical displacemens of sella and nasion points were less than 1 mm. No significant changes were observed in evaluating the position of mandible between structure method and Steiner method. However, there was significant difference between structure method and Ricketts method. The horizontal displacements of these landmarks were similar, but the vertical displacements were significantly different. Conclusion The points of sella and nasion are relatively stable in males during adolescent growth period. The Steiner superimposition method is reliable to evaluate the position of the mandible. In consideration of the limitation of Ricketts method, the treatment results evaluated by this metnod should be interpreted carefully.
【CateGory Index】： R783.5