Articular eminence Inclination and its relationship with incisors mesiodistal inclination in skeletal class I occlusion adults with no clinical and radiographic symptoms of TMDs. (original) (raw)
Related papers
The Journal of Contemporary Dental Practice, 2021
Aim: To evaluate, in an adult population, the effect of orthodontic treatment on the inclination of maxillary incisors, facial, and growth axes in different mandibular divergence pattern. In addition, we aimed to determine if there is an association between the inclination of the maxillary incisors and facial and growth axes and if this association will change after orthodontic treatment. Materials and methods: Two-hundred and thirty-eight consecutive lateral cephalograms (119 at T1 and 119 at T2) of adult patients with an average age of 26.45 ± 9.11 years at T1 and 29.58 ± 9.36 at T2 were selected and digitized. Cephalometric maxillary incisors (I) inclination was measured to cranial base (SN), palatal plane (PP), nasion-A point (NA), nasion-basion (NBa), and true horizontal (H). Facial (FA) and growth (GA) axes' inclinations were measured relative to NBa and H. The sample was stratified in three subgroups based on cephalometric mandibular divergence to anterior SN (MP/SN). A-Hypodivergent = MP/SN ≤27° (n = 28); B-Normodivergent = 27 < MP/SN < 37° (n = 49); C-Hyperdivergent = MP/ SN ≥37° (n = 42). Associations were tested using Chi-square tests for categorical data. Paired sample t-tests and Pearson's correlation were computed for continuous data. Results: At T1, there was a tendency to have more proclined I in group A (I/SN = 105.59 ± 10.8°) and more retroclined in group C (I/SN = 99.06 ± 12.04°) with no statistical significance. However, at T2, maxillary incisors were statistically significant different between groups A and C (p = 0.002). Pre-treatment FA and GA were statistically significantly different among the three divergence groups (p <0.0001) with more increased angles in the group A (FA/Nba = 92.77 ± 5.07°) vs group C (FA/Nba = 86.28 ± 5.08°). This angle increases around 2° on average at posttreatment assessment (group A-p = 0.033; group B-p = 0.002). Correlations between I and facial/growth axes were not statistically significant at T1, whereas at T2 those correlations were higher and statistically significant between I/PP to FA/NBa (r = 0.408; p ≤0.0001). Conclusion: Correlations between the maxillary incisors' inclination and the facial/growth axes were not statistically significant initially whereas after orthodontic treatment, those correlations were higher and statistically significant. Differences in FA existed between pre-and postorthodontic groups in all divergence groups. Clinical significance: Orthodontists should assess the inclination of the maxillary incisors, not only to the maxilla and anterior SN but also to FA and take it into consideration in their treatment objectives.
UI Proceedings on Health and Medicine, 2017
Objective: A concern in fixed appliances orthodontic treatment besides reestablishing the normal occlusion characteristics might cause repositioning of the condyle position in TMJ region. The objective of this research is to find out whether there is a difference of TMJ position in Angle class I malocclusion type 1, 2, 3, 4, and 5 before and after fixed appliances orthodontic treatment. Methods: This research is a pre-and-post design study with analytical statistical approach which compared the TMJ position obtained from tracings 80 lateral cephalometric radiographs before and after fixed appliances orthodontic treatment. Purposive sampling technique was used to determine the sample size in Orthodontic Department of Rumah Sakit Gigi dan Mulut Universitas Padjadjaran from 2009-2015. The data was analyzed by using Kolmogorov-Smirnov Test and paired t-test. Results: This study revealed that the changes of condyle position in Condylion to Vertical T line (horizontally) after orthodontic treatment is not significant (P> 0.05) in Angle class I malocclusion. However, the difference of condyle position in Condylion to TC line (vertically) shows a significant difference (P< 0.05) in Angle class I malocclusion. Conclusion: The distance of the condyle from Condylion to TC line increased after fixed appliances orthodontic treatment for Angle class I malocclusion patients.
Head & Face Medicine, 2013
Introduction: The purpose of this study was to identify possible dentoskeletal parameters associated with variation of anterior tooth inclination in Angle Class II subdivisions. Methods: Pre-treatment lateral radiographs of 144 Class II patients (68 males, 76 females) aged 9 to 17 years were classified for upper incisor inclination into three groups (proclined, normally inclined, retroclined) homogeneous for gender and skeletal jaw relationship. The effect of age on the 22 cephalometric variables was controlled by covariance analysis.
Lower Incisor Inclination and Bony Support in Class II Skeletal Pattern Patients-CBCT Study
Materials and methods: A total of 180 CBCT records were collected from subjects aged between 17 to 35 years old. The subjects were classified into its incisor inclination (procline: 91 subjects and upright: 88 subjects) according to the cephalometrics norms. The buccolingual thickness and alveolar bone height of the mandibular incisors were measured using iCAT Vision Software Interface.
Journal of the world federation of orthodontists, 2020
Background: This study was designed to determine if orthodontic treatment significantly changes the upper incisor position in Class I, II, and III dental and skeletal malocclusions. Methods: Ninety nonextraction-treated patients were included in this retrospective cohort study and divided into three groups: Class I, Class II, and Class III. All cephalometric measurements (ANB, Wits, U1-PP, U1-SN, U1-NA, U1 perpendicular to FH and U1-L1) were taken using the Dolphin Management and Imaging Software, Version 05.05.5070.221436 (United States and Canada). Results: The posttreatment values of ANB, Wits appraisal, U1-NA mm, U1-FH mm, IMPA and U1-L1 are statistically significant (P < 0.05) among the Class I, II, and III when compared with the normal values. Also ANB changes after orthodontic treatment in Class I, II, and III were statistically significant with the greater changes in Class III malocclusion. Conclusions: There is a significant amount of dento-alveolar compensation for the maxillary incisors not only in patients with Class II and III but also in Class I malocclusions that underwent nonextraction treatments.
Malocclusion and the need for orthodontic treatment in patients with temporomandibular dysfunction
PubMed, 2007
Objective: The aim of the study was to investigate the signs and symptoms of temporomandibular disorders (TMD) as well as the relationships between TMD, malocclusion and the need for orthodontic treatment. Material and methods: Forty consecutive patients (36 F, 4 M) with a median age of 35 (IQR 18) years. Eighteen patients had Class I, 22 patients Class II malocclusion. A rating scale for the influence of TMJ pain/discomfort on the activities of daily living (ADL) was used simultaneously with clinical examination. Helkimo's Dysfunction Index (D(i)) and the Index of Orthodontic Treatment Need (IOTN) were determined for each participant. Results: Pain/discomfort in the TMJ area was positively correlated with interferences in laterotrusion (p=0.021), pain on palpation over the posterior aspects of TMJ (p=0.012) and pain in the masticatory muscles (p=0.023). The impact of TMJ pain/discomfort was greatest on the performance of a yawn and on opening the mouth wide. There was no statistically significant correlation between malocclusion, D(i)and IOTN. A comparison of Class I malocclusion patients to those with Class II malocclusion revealed no statistically relevant differences in Di and ADL. Conclusion: In patients with malocclusion, pain from TMJ has a significant negative impact on activities of daily living. No significant differences were observed between Angle Class I and Class II groups of patients with respect to TMD. Orthodontic treatment was required for both groups.
International Journal of Health Sciences (IJHS), 2023
Background and Aim: The orthodontic tooth movements should be such that the tooth moves safely within the alveolar bone. The alveolar bone around the mandibular central incisors of patients with skeletal class I and II malocclusion is thicker in comparison to those with skeletal class III malocclusion. The present study aimed to investigate an association between low angle inclination skeletal class-III malocclusion and the alveolar bone morphology around it. Materials and Methods: A retrospective study was carried out on 75 306 malocclusion patients in the Orthodontics Department of a Tertiary Care Hospital of Islamabad, Pakistan from January 2020 to December 2022. The malocclusions were confirmed in the patients via cone beam computed tomography (CBCT) imaging. The low angle, skeletal class III malocclusions were categorized into three different groups: Group-I (lingual-inclination), Group-II (upright), and Group-III (labialinclination). Outcomes such as height of alveolar bone and area of cortical as well as cancellous thickness were determined independently on each side. Results: The labial cancellous bone thickness, thickness of labial cortical bone, alveolar bone total thickness, labial alveolar bone total area, and labial alveolar bone height were highest in group-III (labial-inclination). There was a positive correlation between mandibular central incisors and other aforementioned variables. Regarding the teeth's 'lingual side', there were no significant differences between all three groups. Conclusion: The present study found that the skeletal class III malocclusion of low-angle labial inclination category was significantly associated with alveolar bone morphology on the mandibular central incisor's labial aspect.
Lower Incisor Positions in Different Malocclusions and Facial Pattern
Journal of Pharmaceutical Research International, 2021
Aims: The position of lower incisor has been of significant concern when seeking orthodontic treatment plan, it has been recognized as one of diagnostic key and play an important in the development of normal occlusion and facial pattern. This study was aimed at the determination of lower incisor position and its possible association with different sagittal malocclusions and facial patterns. Study Design: Descriptive Cross-sectional Study Place and Duration of Study: Department of Orthodontics Institute of Dentistry Liaquat University Medical and Health Sciences (LUMHS) Jamshoro between June 2019 to July 2020. Methodology: Ninety-seven pre-treatment lateral cephalometric radiographies were taken, and they were classified sagittally into skeletal class I, II and III, and vertically into normodivergent, hyperdivergent and hypodivergent facial pattern using ANB and SNMP, respectively. Lower incisor position was assessed by means of FMIA and IMPA. One way analysis of variance (ANOVA...
Changes of occlusal plane inclination after orthodontic treatment in different dentoskeletal frames
Progress in orthodontics, 2014
The inclination of the occlusal plane (OP) is related to facial types and experiences physiological growth-related changes. The aims of this research were to determine if there were any differences in the inclination of OP in subjects with three types of skeletal malocclusion and to investigate the characteristics and differences of functional occlusal plane (FOP) compared to bisected occlusal plane (BOP). A sample of 90 Caucasians patients was skeletal-classified into three (n = 30), and pre- and post-treatment cephalograms were digitized. Six linear and 8 angular cephalometric measurements were selected. The changes of OP inclination within each group and the differences among the three groups pre- and post-treatment were compared with paired t test and ANOVA test, respectively. The comparison and correlation between BOP and FOP were analyzed with paired t test and coefficient of correlation, respectively. The BOP angle increased in all of the three groups but only had statistical...