Open Access. Powered by Scholars. Published by Universities.®
Orthodontics and Orthodontology Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Orthodontics and Orthodontology
Dentofacial Morphology Of Skeletal Class Ii Malocclusion With Mandibular Retrusion, Yu-Chun Lin, Hong-Po Chang, Yi-Hsin Yang, Yu-Chuan Tseng, Chin-Yun Pan, Szu-Ting Chou
Dentofacial Morphology Of Skeletal Class Ii Malocclusion With Mandibular Retrusion, Yu-Chun Lin, Hong-Po Chang, Yi-Hsin Yang, Yu-Chuan Tseng, Chin-Yun Pan, Szu-Ting Chou
Taiwanese Journal of Orthodontics
Objective: The aim of this study was to investigate the morphological characteristics of the craniofacial pattern in skeletal Class II adults with mandibular retrusion. Materials and methods: Lateral cephalograms of 80 adults with skeletal Class II malocclusion with mandibular retrusion (∠ANB > 5°, ∠FNB < 86°) compared with 80 adults with normal occlusion (equal sexes in both groups). Thirty five landmarks were identified and digitized. Cephalometric analysis utilizing 30 linear, 29 angular and 4 ratio measurements were undertaken. Statistical comparison of the two groups was performed with Student’s t-test and 2 way-ANOVA. Results: (1) The skeletal Class II sample with mandibular retrusion had longer anterior cranial base length but the internal cranial base angle and the saddle angle were not different from the normal occlusion subject. (2) The sample with mandibular retrusion had longer maxillary length but the maxilla was in normal position related to the cranial base. The mandible was more retrusive and smaller but the ramus width was wider than normal occlusion subject due to compensatory growth. (3) The mandibular retrusion sample had more tilting maxillary plane, mandibular plane, ramus plane and occlusal plane. The sample had longer total anterior facial height, longer upper and lower anterior facial height and shorter posterior facial height (shorter ramus height) than normal occlusion subjects. Hyperdivergent facial pattern and the mandible rotated clockwisely were noted. (4) The mandibular retrusion sample had extrusive but normal inclined upper incisors, more inclined and extrusive lower incisors, smaller interincisal angle, larger overjet and deep overbite. (5) The mandibular retrusion group had more mesial tipping and more extrusive upper 1st molars. Besides, more mesial tipping, more retrusive, and more extrusive lower 1st molars were noted. Conclusion: Multiple variations of skeletodental features were found for skeletal Class II malocclusion with mandibular retrusion.
Characteristics Of Dentofacial Morphology In Bimaxillary Protrusion Patients, Chiung-Yu Chen, Hong-Po Chang, Yi-Hsin Yang, Yu-Chuan Tseng, Chin-Yun Pan, Szu-Ting Chou
Characteristics Of Dentofacial Morphology In Bimaxillary Protrusion Patients, Chiung-Yu Chen, Hong-Po Chang, Yi-Hsin Yang, Yu-Chuan Tseng, Chin-Yun Pan, Szu-Ting Chou
Taiwanese Journal of Orthodontics
Objective: Dentofacial abnormalities, such as bimaxillary protrusion, can be distressing both socially and psychologically. The aim of this study is to identify the cephalometric features of bimaxillary protrusion and highlight the measurements that characterize bimaxillary protrusion when compared to a normal occlusion group. Materials and methods: Lateral cephalograms of 60 pretreated bimaxillary protrusion young adults were compared with 60 untreated young adults with normal occlusion. Male and female were equal in each group. Thirty-two landmarks were identified for 61 skeletal, dental and soft tissue parameters. The differences between the two groups were analyzed by means of Student’s t-test and two-way …
Cephalometric Linear Measurements On Conventional Digital Cephalograms And Cone-Beam Ct 3-D Craniofacial Images, Zwei-Chieng Chang, Yu-Chun Huang, Eddie Lai, Chung-Chen Yao, Yi-Jane Chen
Cephalometric Linear Measurements On Conventional Digital Cephalograms And Cone-Beam Ct 3-D Craniofacial Images, Zwei-Chieng Chang, Yu-Chun Huang, Eddie Lai, Chung-Chen Yao, Yi-Jane Chen
Taiwanese Journal of Orthodontics
Introduction: The purpose of this study was to investigate the correlation between the actual linear measurements on human skull and the cephalometric measurements obtained from conventional digital cephalogram and cone-beam computed tomography (CBCT) 3-D images. Materials and Methods: Lateral and postero-anterior cephalograms of 3 skulls were assessed by measuring the commonly used 11 linear measurements. The CBCT volume images were obtained and measured by using 3-D image software (i-CAT/ Simplant Pro 12.02). The measurements with conventionally manual tracing method, WinCeph software (2-D), and those on 3-D images were compared with the gold standards derived from repeated caliper measurements of the …
Soft And Hard Tissue Changes After Presurgical Orthodontics In Class Iii Patients, I-Ming Tsai, Hui-Ling Chen, Yu-Ching Wang
Soft And Hard Tissue Changes After Presurgical Orthodontics In Class Iii Patients, I-Ming Tsai, Hui-Ling Chen, Yu-Ching Wang
Taiwanese Journal of Orthodontics
The aims of this retrospective cephalometric study were to assess the results of presurgical treatment on the subjects presenting with Class III malocclusion and to evaluate the correlation between soft and hard tissues. Initial (T0) and presurgical (T1) lateral cephalograms of 17 patients were examined. Mean age was 20.4 years initially. Subjects were treated with presurgical orthodontic treatment. Initial and presurgical variables were compared using paired t-test, and the relationship of soft and hard tissue variables was studied using Pearson correlation coefficient and linear regression equation. Significant changes were found in hard (U1E 1.4±2.6 mm, FMIA -6.9±6.8°, IMPA 5.8±6.5°, L1E …