scholarly journals 3D CBCT Evaluation of Condyle Position in Skeletal Class I & Class III Growing Subjects

2018 ◽  
Vol 7 (2) ◽  
pp. 9-14
Author(s):  
Rajiv Kumar Mishra ◽  
Om Prakash Kharbanda ◽  
Rajiv Balachandran
Keyword(s):  
Three Dimensional ◽  
T Test ◽  
Class I ◽  
Class Iii ◽  
Skeletal Class ◽  
Significant Difference ◽  
Condyle Position ◽  
Condylar Position ◽  
And Function ◽  
Cbct Analysis

Introduction: Evaluation of temporo-mandibular joint (TMJ) anatomy and function is an essential part of orthodontic diagnosis and treatment planning. It has been hypothesized that dental and skeletal malocclusions alter the functional loading of TMJ which can affect joint morphology.Objective: Three dimensional (3D) evaluation of condylar position using CBCT in skeletal Class I and Class III growing subjects.Materials & Method: CBCT images of ten growing skeletal Class I & ten Class III patients in the age range of 7-14 years were analyzed. 3D condylar position were evaluated representing antero-posterior, vertical, laterolateral position of condyle, axial condylar angle and coronal condylar angles which were measured in axial, coronal and sagittal sections using Dolphin Imaging software. Antero-posterior and vertical difference of right and left condyle were measured in axial and coronal sections respectively.Result: Paired t-Test revealed no significant difference between right and left sides of condyle in skeletal Class I as well as Class III subjects. Independent t-test and Mann-Whitney U test showed no significant difference between position of condyle in ClassI and Class III subjects.Conclusion: 3D CBCT analysis shows no significant difference in condylar position of skeletal Class I and Class III subjects.

scholarly journals Correlation of frankfort horizontal with the sellanasion line angular data in different sagittal skeletal bases

2020 ◽  
Vol 16 (12) ◽  
pp. 1088-1093
Author(s):  
Mathew Thomas Maliael ◽  
Keyword(s):  
T Test ◽  
Class I ◽  
Gender Dimorphism ◽  
Skeletal Class ◽  
Significant Difference ◽  
Beta Angle ◽  
Angular Data ◽  
The Difference ◽  
The One ◽  
One Way Anova

It is of interest to establish the cephalometric correlation of angular data between frankfort horizontal and the sella-nasion line in different sagittal skeletal bases. Beta angle was used to divide the sample based on their sagittal skeletal base relationship. The FH-SN angle was measured for each group. The data were tabulated into IBM SPSS software. Kolmogorov-Smirnov and Shapiro-Wilk test was done to test the normal distribution of the data. One-way ANOVA analysis was done to test the difference of the FH-SN angle among the groups. Independent samples t-Test was done to test for gender dimorphism. The mean FH-SN angle of the sample was 6.33°3.35°. The results of the One-Way ANOVA and independent samples t-Test were insignificant. Results show that is no statistically significant difference in FHSN angle between skeletal class I, II and III.The mean FH-SN angle of the sample was 6.33°3.35°. The distribution of the data was normal. The results of the One-Way ANOVA and Independent samples t-Test were insignificant. There was no statistically significant difference in FH-SN angle between skeletal class I, II and III.

scholarly journals Comparison of Changes in the Condylar Volume and Morphology in Skeletal Class III Deformities Undergoing Orthognathic Surgery Using a Customized versus Conventional Miniplate: A Retrospective Analysis

2020 ◽  
Vol 9 (9) ◽  
pp. 2794
Author(s):  
You Na Lim ◽  
In-Young Park ◽  
Jong-Cheol Kim ◽  
Soo-Hwan Byun ◽  
Byoung-Eun Yang
Keyword(s):  
Conventional Method ◽  
Three Dimensional ◽  
Patient Specific ◽  
Computer Assisted ◽  
Class Iii ◽  
Specific System ◽  
Sagittal Split Ramus Osteotomy ◽  
Skeletal Class ◽  
Surgical Technology ◽  
Significant Difference

With the great leap in the development of three-dimensional computer-assisted surgical technology, surgeons can use a variety of assistive methods to achieve better results and evaluate surgical outcomes in detail. This retrospective study aimed to evaluate the postoperative stability after bilateral sagittal split ramus osteotomy by volume rendering methods and to evaluate how postoperative stability differs depending on the type of surgical plate. Of the patients who underwent BSSRO, ten patients in each group (non-customized miniplate and customized miniplate) who met the inclusion criteria were selected. Preoperative and postoperative cone-beam computed tomography data were collected, and condylar morphological and landmark measurements were obtained using Checkpoint and OnDemand software, respectively. The postoperative condylar morphological dataset revealed no significant difference (p > 0.05) between the two groups. No significant difference (p > 0.05) was observed between the two groups in horizontal, vertical, or angular landmark measurements used to quantify operational stability. These results indicate that there is no difference in the surgical outcome between the patient-specific system and the conventional method, which will allow clinicians to take advantage of the patient-specific system for this surgical procedure, with favorable results, as with the conventional method.

scholarly journals Evaluation of horizontal condylar angle in malocclusions with mandibular lateral displacement using cone-beam computed tomography

2021 ◽  
Author(s):  
Roberto L. Velásquez ◽  
Jorge C. Coro ◽  
José M. Bustillo ◽  
Sadao Sato
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Lateral Displacement ◽  
Class Ii ◽  
Contralateral Side ◽  
Class I ◽  
Cone Beam ◽  
Class Iii ◽  
Skeletal Class ◽  
Significant Difference

ABSTRACT Objectives To evaluate the horizontal condylar angle (HCA) in mandibular lateral displacement (MLD). Materials and Method s: HCA in MLD malocclusions were examined using cone-beam computed tomography data in subjects with MLD and control subjects. Results HCA in joints of control patients and contralateral side joints of MLD patients were not significantly different. The mean HCA on the shifted side was larger than on the contralateral side (P < .001) in the different HCA groups. HCA was significantly larger on the shifted side than on the contralateral side in skeletal Class I, Class II, and Class III groups (P < .001). Conclusions (1) There was no statistically significant difference between HCA in control patients and on the contralateral side in MLD patients. (2) HCA was significantly larger on the shifted side than on the contralateral side. (3) HCA on the shifted side and the contralateral side in MLD Class I, Class II, and Class III are significantly different.

Mesiodistal Angulation of Each Whole Tooth in Patients With Nonsyndromic Unilateral Cleft Lip and Palate: Is it Symmetrical?

2020 ◽  
pp. 105566562096753
Author(s):  
Yağmur Lena Sezici ◽  
Furkan Dindaroğlu ◽  
Abdülkadir Işık ◽  
Servet Doğan
Keyword(s):  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Asymmetry Index ◽  
T Test ◽  
Class I ◽  
Control Group ◽  
Second Molar ◽  
Skeletal Class ◽  
Significant Difference ◽  
Mandibular Teeth

Objective: To assess the symmetry of the mesiodistal angulations of maxillary and mandibular teeth in patients with unilateral cleft lip and palate (UCLP) and compare with the class I control group without cleft lip and palate (CLP). Design: A retrospective study. Setting: University department. Patients, Participants: The panoramic radiographs of 45 orthodontically untreated individuals with nonsyndromic UCLP (mean age 14.13 ± 0.75 years) and 45 skeletal class I individuals without CLP (mean age 14.01 ± 0.74 years). Interventions: The line passing through the most superior points of the condyles was taken as the reference. The angle between the long axes of the maxillary and mandibular teeth and reference line was measured digitally. With the purpose of determining condylar symmetry, mandibular asymmetry index measurements were utilized. Independent samples t test and paired samples t test were used for the statistical analyses. Main Outcome Measure(s): The mesiodistal angulation of the maxillary and mandibular teeth in patients with UCLP was measured. The differences between the contralateral sides were determined and compared to class I individuals without CLP. Results: No statistically significant difference was found among the condylar asymmetry in both groups ( P > .05).The significant differences between the cleft and noncleft sides in the UCLP group was observed in the maxillary central, canine, first premolar and second molar teeth ( P < .001, P = .002, P = .013, P = .012, respectively). The mean differences were found to be higher in the central and lateral incisors, canines and first premolars in the UCLP group ( P < .001, P = .006, P = .001, respectively). Conclusions: Although the cleft-side maxillary central incisors tipped in a distal direction in patients with UCLP, the canine and first premolar showed more inclinations toward the mesial direction.

scholarly journals Comparison of three-dimensional soft-tissue evaluations between skeletal and pseudo-class III malocclusions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Burak Kale ◽  
Muhammed Hilmi Buyukcavus
Keyword(s):  
Soft Tissue ◽  
Demographic Data ◽  
Three Dimensional ◽  
Middle Part ◽  
Class I ◽  
Control Group ◽  
Class Iii ◽  
Upper Lip ◽  
Linear Measurements ◽  
Skeletal Class

Abstract The aim of our study was to compare soft tissue measurements with 3D imaging methods in individuals with untreated skeletal and pseudo-Class III malocclusions. The study sample consisted of 75 patients (38 males, 37 females, mean age 12.41 ± 2.35 years) with pseudo- and true skeletal Class III malocclusions and skeletal Class I malocclusions. Soft tissue evaluations of all patients were performed using 3D stereophotogrammetric facial images. In our study, 26 landmarks, 17 linear measurements, 13 angular measurements, and 5 volume measurements were made using the 3dMD Vultus software. The significance was determined to be p < 0.05 in ANOVA, Tukey tests. No significant differences were found among the groups in terms of demographic data (p > 0.05). The skeletal Class I control group had a significantly more extended upper lip and vermillion length as compared to the Class III groups. The soft tissue convexity angle and upper nasal angle were found to be wider in the Class III malocclusion group compared to those in the Class I control group. While the pseudo-Class III group had a significantly lower midface volume, chin volume was significantly higher in the skeletal class group. Upper lip volume was significantly higher in the Class I group. Using 3dMD for guiding clinicians in the differential soft and hard tissue diagnosis of pseudo-Class III malocclusions, differences were revealed in Class I patients in the middle part of the face. In the differential diagnosis of true Class III malocclusions, chin volume was found to be different from that of Class I patients.

Quantitation of Mandibular Symphysis Bone as Source of Bone Grafting: Description in Class I and Class III Skeletal Conditions

2017 ◽  
Vol 43 (3) ◽  
pp. 211-217 ◽  
Author(s):  
Humberto Velásquez ◽  
Sergio Olate ◽  
César Díaz ◽  
Pablo Navarro ◽  
Eduardo Borie ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Cancellous Bone ◽  
Class I ◽  
Dental Occlusion ◽  
Class Iii ◽  
Linear Measurements ◽  
Average Width ◽  
Mandibular Symphysis ◽  
Skeletal Class ◽  
Significant Difference

The aim of this study was to quantify the cortical and cancellous bone in the mandibular symphysis and relate it to the teeth and to the skeletal class. A descriptive study was conducted using cone beam computerized tomography (CBCT). Class I and class III subjects were included, defined according to dental occlusion and cephalogram results. Linear measurements were taken on the CBCT of the mandibular canines, lateral incisors, and central incisors, where the analysis was related to the axial and apical axes considering the bone in relation to the dental area. With previous definitions, an observer took 2 measurements of the height of the mandibular symphysis, cortical bone of the buccal and lower region, and thickness of cancellous bone at different levels; the correlation coefficient between the first and second measurement was 0.99 and presented P = .001. The results were analyzed with analysis of variance and Tukey's honest significant difference test, with P &lt; .05 being statistically significant. The symphysis height was significantly greater in class III subjects. The cortical bone was an average 1.67 ± 0.44 mm in vertical distance in the skeletal class I group and 1.74 ± 0.47 mm in the class III group. The cancellous bone had an average width of 5.03 ± 1.94 mm in the skeletal class I group and 4.74 ± 2.05 mm in the class III group. It was observed that cancellous bone was significantly thicker at the incisor level than at the canine level. There were anatomical differences between skeletal class I and class III subjects, although the clinical significance may be questionable. With the values from these analyses, it may be concluded that there are no significant differences in quantitation of the cortical and cancellous bone in the anterior mandibular symphysis.

scholarly journals Cephalometric assessment of maxillary length in Serbian children with skeletal class III

2013 ◽  
Vol 70 (7) ◽  
pp. 645-652 ◽  
Author(s):  
Zdenka Stojanovic ◽  
Predrag Nikolic ◽  
Angelina Nikodijevic ◽  
Jasmina Milic ◽  
Branislav Stojanovic
Keyword(s):  
Cranial Base ◽  
Mixed Dentition ◽  
Class I ◽  
Control Group ◽  
Class Iii ◽  
X Ray ◽  
Skeletal Class ◽  
Jaw Bones ◽  
Significant Difference ◽  
Group A

Background/Aim. Malocclusion of skeletal class III is a complex irregularity of sagittal inter-jaw relationship, which is due to irregularities of sagittal position of one or both of the jaw bones, which is often associated with disproportionate ratio of their length. The aim of this study was to determine whether the length of the jaw of children with skeletal class III in the period of mixed dentition was changed. Methods. Fifty children with skeletal class III and the same number of those with skeletal class I, of both sexes, have been selected on the basis of cephalometric analysis of profile tele-x-ray of the head. All the children aged 6-12 had mixed dentition, and were divided according to sex and age into three subgroups within each group. The length of maxilla, mandible and cranial base were measured. Proportions among the lengths measured within each group were found and difference significance in the measured lengths and their proportions among groups and subgroups were evaluated. Results. The children with skeletal class III, compared with the findings in the control group, had significantly lower values of maxillary length, total maxillary length, as well as lower values of their lengths in proportion to lengths of the front or the total length of cranial base and in proportion to mandibular lengths (p < 0.05). Among the patients of different sexes, both in the test and the control group, a significant difference in the values of the measured lengths was found. Conclusion. The children with skeletal class III have significantly shorter maxilla than those with skeletal class I.

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