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.
","abstract_html":"<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>","abstract_has_math":false,"creators":["Barra, James"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Orthodontics and Dentofacial Orthopedics","degree_department":null,"school":null,"contributors":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Rynearson, R. David"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-01T07:00:00Z","date_published":"2015-09-01T07:00:00Z","updated_at":"2026-07-24T02:52:38Z","subjects":["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"],"languages":["English"],"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."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/366","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Rynearson, R. David"]},{"key":"dc:creator","label":"Author","values":["Barra, James"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Orthodontics and Dentofacial Orthopedics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["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"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["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."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsrepository.llu.edu/etd/366"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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.
"]},{"key":"dc:title","label":"Title","values":["Tooth Size Ratio in Orthodontic Patients with Varied Sagittal Skeletal Patterns; A CBCT Study"]}]}],"canonical_facts":{"dc:contributor":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Rynearson, R. David"],"dc:creator":["Barra, James"],"dc:description.abstract":["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.
"],"dc:identifier":["https://scholarsrepository.llu.edu/etd/366"],"dc:language":["English"],"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."],"dc:subject":["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"],"dc:title":["Tooth Size Ratio in Orthodontic Patients with Varied Sagittal Skeletal Patterns; A CBCT Study"],"thesis:degree_discipline":["Orthodontics and Dentofacial Orthopedics"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T02:52:38Z"}