Tooth Size Ratio in Orthodontic Patients with Varied Sagittal Skeletal Patterns; A CBCT Study

<p>Objective: Maxillomandibular tooth size ratio (TSR) is an important aspect in achieving a satisfactory orthodontic outcome. The purpose of this study is to compare TSR among orthodontically treated patients with different skeletal anteroposterior (AP) patterns. Methods and Materials: The post-treatment (T2) cone beam computed tomograms (CBCTs) of patients treated orthodontically without extraction and finished with canine and molar class I occlusion were evaluated. The subjects were categorized into class I, class II and class III skeletal pattern by analyzing A point-Nasion-B point (ANB) at T2. Overbite (OB), overjet (OJ), TSR for canine to canine (TSR3-3) and molar to molar (TSR6-6), maxillary incisor to sella-nasion (U1-SN) angle, sella-nasion to mandibular plane (SN-MP) angle, lower incisor to mandibular plane (L1-MP) angle and interincisal angle (IIA) were measured and recorded. The data were compared using Kruskal-Wallis one-way analysis of variance and correlated using Spearman rank-correlation coefficient at α = 0.05. Results: Of the 128 patients, 68 were skeletally class I, 29 were class II, and 31 were class III. The overall mean values for TSR3-3 and TSR6-6 were 77.0% and 92.4%, respectively. Significant differences (p < .05) were observed in all parameters when compared among different skeletal patterns except for both TSR values (p > .05). TSR3-3 and TSR6-6 were correlated with each other (ρ =0.485; p < .001) but bore no statistically significant relationship with any other parameter. Conclusion: The TSR values for dental class I non-extraction orthodontic cases are similar regardless of skeletal pattern and comparable to Bolton’s published values.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Orthodontics and Dentofacial Orthopedics

Year

2015

Author dc:creator

• Barra, James

Contributors dc:contributor

• Rungcharassaeng, Kitichai
• Caruso, Joseph M.
• Rynearson, R. David

• Dentistry
• Medicine and Health Sciences
• Orthodontics and Orthodontology
• Cone-beam Computed Tomography; Tooth Radiography; Mandible -- Growth & Development; Orthodontics; Corrective
• Tooth Size Ratio; Orthodontic Outcome; Skeletal Anteroposterior Patterns

Statement dc:rights

• This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Language dc:language

English

Repository record dc:identifier

https://scholarsrepository.llu.edu/etd/366

OAI identifier oai:identifier

oai:scholarsrepository.llu.edu:etd-1365