Semester
Spring
Date of Graduation
2024
Document Type
Thesis
Degree Type
MS
College
School of Dentistry
Department
Orthodontics
Committee Chair
Peter Ngan
Committee Member
Khaled Alsharif
Committee Member
Guoqiang Guan
Abstract
Abstract
The Impact of Normal Growth on the AP Relationships of the Jaws and Incisors to the Forehead: A Serial Cephalometric Analysis of Untreated Individuals
Adam Rudmann D.D.S. M.S.
Background and Objectives
Growth of the craniofacial complex is a critical factor to consider when treatment planning an orthodontic case. The ability to predict how the forehead and jaws will change over time depends on the ability to find predictable landmarks either radiographically or clinically, and use them to gauge the relative growth of various facial structures. This data can then be integrated with other diagnostic information such as occlusion and facial esthetics to arrive at an appropriate diagnosis and treatment plan. The purpose of this investigation was to evaluate the impact on the facial profile of normal jaw growth after the complete eruption of the permanent incisors in untreated individuals using soft tissue glabella as the primary landmark.
Materials and Methods
Serial lateral cephalograms of 74 untreated growing individuals (3 female, 39 male) from the Oregon, Iowa, and Bolton-Brush Growth Studies were obtained from the AAOF Legacy Collection. Cephalometric superimpositions were used to assess AP jaw and incisor displacement during the growth period using a novel method of superimposition centered on the external surface of the forehead (glabella).
Results
The mean age of the sample at the beginning of the observation period (T1) was 10.1 years and 17.7 at the end of the observation period (T2). The AP position of the maxillary incisor showed an average of 0.34mm anterior displacement in relation to Glabella in untreated subjects between T1 and T2 with no significant difference between males or females. The AP position of the mandibular incisor showed an average of 0.96mm anterior displacement in relation to Glabella in untreated subjects between T1 and T2 with a significant difference between male and female subjects (p=.04); male subjects had a greater lower incisor displacement (1.35mm vs. 0.57mm) relative to Glabella than female subjects. No other statistically significant differences were found in means of other measurements between sexes.
Conclusion
Based on the findings of this research, the null hypothesis of: After the complete eruption of the permanent incisor teeth, and in the absence of orthodontic treatment, growth anomalies, or other significant environmental influences, normal growth will significantly affect the AP positions of the jaws and incisors relative to the external surface of the forehead, can be rejected. After the complete eruption of the permanent incisor teeth, and in the absence of orthodontic treatment, growth anomalies, or other significant environmental influences, normal growth will not significantly affect the AP positions of the jaws and incisors relative to the external surface of the forehead (glabella).
Recommended Citation
Rudmann, Adam Joseph Dr, "The Impact of Normal Growth on the AP Relationships of the Jaws and Incisors to the Forehead: A Serial Cephalometric Analysis of Untreated Individuals" (2024). Graduate Theses, Dissertations, and Problem Reports. 12331.
https://researchrepository.wvu.edu/etd/12331
Embargo Reason
Publication Pending