scholarly journals Palatal bone thickness at the implantation area of maxillary skeletal expander in adult patients with skeletal Class III malocclusion: a cone-beam computed tomography study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Weiting Chen ◽  
Kaili Zhang ◽  
Dongxu Liu
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Adult Patients ◽  
Cone Beam ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Bone Thickness ◽  
Skeletal Class ◽  
Significant Difference ◽  
Palatal Bone

Abstract Background Maxillary skeletal expanders (MSE) is effective for the treatment of maxillary transverse deformity. The purpose of the study was to analyse the palatal bone thickness in the of MSE implantation in patients with skeletal class III malocclusion. Methods A total of 80 adult patients (40 males, 40 females) with an average angle before treatment were divided into two groups, the skeletal class III malocclusion group and the skeletal I malocclusion group, based on sagittal facial type. Each group consisted of 40 patients, with a male to female ratio of 1:1. A cone-beam computed tomography scanner was employed to obtain DICOM data for all patients. The palatal bone thickness was measured at 45 sites with MIMICS 21.0 software, and SPSS 22.0 software was employed for statistical analysis. The bone thickness at different regions of the palate in the same group was analysed with one-way repeated measures ANOVA. Fisher’s least significant difference-t method was used for the comparison of pairs, and independent sample t test was employed to determine the significance of differences in the bone thickness at the same sites between the two groups. Results Palatal bone thickness was greater in the middle region of the midline area (P < 0.01), while the thickness in the middle and lateral areas in both groups was generally lower (P < 0.001). The bone in the anterior, middle, and posterior regions of the two groups became increasingly thin from the middle area toward the parapalatine region. The palatal bone was significantly thinner in the area 9.0 mm before the transverse palatine suture in the midline area, 9.0 mm before and after the transverse palatine suture in the middle area, and 9.0 mm after the transverse palatine suture in the lateral area. Conclusion The palatal bone was thinner in patients with class III malocclusion than in patients with class I malocclusion, with significant differences in some areas. The differences in bone thickness should be considered when MSE miniscrews are implanted. The anterior and middle palatal areas are safer for the implantation of miniscrews, while the thinness of the posterior palatal bone increases the risk of the miniscrews falling off and perforating.

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 &lt; .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 &lt; .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.

scholarly journals Palatal Bone Thickness of MSE Implantation area in Adult Patients with Skeletal Class Ⅲ Malocclusion: A Cone-beam Computed Tomographic Study

2021 ◽  
Author(s):  
Weiting Chen ◽  
Kaili Zhang ◽  
Dongxu Liu
Keyword(s):  
Inferior Turbinate ◽  
Adult Patients ◽  
Cone Beam ◽  
Bone Thickness ◽  
Female Ratio ◽  
Skeletal Class ◽  
Computed Tomographic ◽  
Significant Difference ◽  
The Difference ◽  
Palatal Bone

Abstract Background: Analyze the palatal bone thickness of maxillary skeletal expander (MSE) implantation area in adult patients with skeletal class Ⅲ malocclusion based on Cone-beam computed tomography (CBCT) data, and to provide a reference for the implantation of the miniscrew.Methods: A total of 80 adult patients (40 M, 40 F) with an normal angle before treatment were divided into two groups; skeletal class Ⅲ malocclusion group and skeletal Ⅰ malocclusion group according to sagittal facial type, with 40 patients in each group, with a male to female ratio of 1: 1. CBCT scanner was used to obtain DICOM data from all patients.The palatal bone thickness was measured at 45 sites with MIMICS 21.0 and SPSS 22.0 was employed for statistical analysis. The bone thickness of different regions of the palate in the same group was analyzed by one-way analysis of variance (ANOVA) method; Fisher’s least significant difference (LSD)-t method was used for comparison in pairs, and an independent sample t-test was employed to test the difference of bone thickness in the same area between the two groups.Results: (1) There was no significant difference among the anterior, middle, and posterior regions of the midline area in patients with skeletal class Ⅲ malocclusion (P > 0.05). Palatal bone thickness decreased gradually from front to back in the middle and lateral areas in both groups (P < 0.001). (2) The bone thickness of the anterior, middle, and posterior regions of the two groups gradually decreased from the middle area to the parapalatine region. (3) The palatal bone were significant thinner in the area 9.0 mm before the transverse palatine suture in midline area, 9.0 mm before and after the transverse palatine suture in the middle area, and 9.0 mm after the transverse palatine suture in the lateral area.Conclusion: (1) The palatal bone of patients with class Ⅲ malocclusion was thinner in some areas, so the MSE implant anchorage position could be moved forward appropriately. (2) The thin palatal bone increased the risk of MSE anchorage screw penetrating nasal mucosa and even inferior turbinate. Patients should be given a more precise and personalized implantation scheme based on factors such as palatine bone thickness and palatal morphology.

scholarly journals Orthosurgical Management of Class III Malocclusion Emphasizing the Pivotal Role of CBCT

2020 ◽  
Vol 54 (1) ◽  
pp. 69-76
Author(s):  
Gaurav Pratap Singh ◽  
Karan Nehra ◽  
Rajat Mitra ◽  
Oonit Nakra ◽  
Abhishek Singla
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Resorption ◽  
Cone Beam ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Arduous Task ◽  
Recent Innovation

Management of skeletal class III malocclusions in a nongrowing individual remains a challenging and arduous task for the orthodontist. The skeletal class III malocclusion is often not amenable to camouflage procedures and requires a surgical correction of the underlying skeletal bases to achieve esthetic and functional treatment results. These patients often require one or more extractions to remove the preexisting dentoalveolar compensations prior to the surgical procedure which is undertaken as part of presurgical orthodontics. Postsurgical orthodontics is often of limited duration and is concerned with the settling of occlusion and obtaining tight cuspal interdigitation. Cone-beam computed tomography is a recent innovation which has revolutionized imaging in dentistry. Within orthodontics, it has proven to be of great value in orthosurgical planning and evaluation of posttreatment results including root parallelism and root resorption. This case report describes orthosurgical management of class III malocclusion utilizing cone-beam computed tomography in treatment planning.

scholarly journals Cone beam computed tomography analysis in 3D position of maxillary denture

Open Medicine ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 340-346
Author(s):  
Ying Jia ◽  
Hua Yang ◽  
Ping Li ◽  
Jiangyan Xiong ◽  
Bo Chen
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Class Iii ◽  
Posterior Teeth ◽  
Skeletal Class ◽  
Anterior Teeth ◽  
Normal Occlusion ◽  
Significant Difference ◽  
Torque Angle

AbstractThe dynamic correlation between teeth and denture morphology as well as the morphological positions needs to be explored.Methodology63 adult patients with skeletal class III malocclusions that met the inclusion criteria were enrolled and imaged with Cone Beam Computed Tomography (CBCT), and Digital Imaging and Communications in Medicine (DICOM) data were collected. The torque angle and axial inclination were measured and analyzed for the corona, root, and entire body of every tooth on the maxilla.ResultsThere is a statistically significant difference between the coronal axial inclination/coronal torque angle for the skeletal class III malocclusion cases and Andrew’s six keys of occlusion. On the sagittal plane of the maxillary denture (except that the secondary molar is inclined medial-distally), the remaining teeth are inclined towards the labia with slightly larger angles compared to the normal occlusion. In the coronal direction, the maxillary anterior teeth tend to have a corona that inclines medial-distally, whereas the posterior teeth have a buccal inclination compared to the normal occlusion.ConclusionSagittal and transversal compensations prevail in maxillary dentures; for the camouflaged treatment design for skeletal class III, there is limited scope of sagittal and transversal movements on the maxillary denture.

scholarly journals Comparison of Volumetric Dimensions of Pharyngeal Airway for Different Dentofacial Skeletal Patterns Using Cone Beam Computed Tomography

Folia Medica ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 572-577
Author(s):  
Madhura Jadhav ◽  
Veera Bhosale ◽  
Amol Patil ◽  
Siddharth Shinde
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Facial Morphology ◽  
Class Iii ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Significant Difference ◽  
Nasopharyngeal Airway ◽  
The Relationship

Introduction: After a century of controversies, we are still not certain on the relationship between airway volume and facial morphology. Objective: To measure nasopharyngeal airway volume and compare it among different skeletal patterns. Materials and methods: Forty five CBCT scans of patients between sixteen to twenty five years were used in the study. The nasopharyngeal airway was divided into upper, middle and lower segments. CBCT images were grouped into skeletal class I, class II and class III. Results: There was highly significant difference in upper (p=0.001) and middle pharyngeal airway volume (p<0.001) among 3 skeletal groups. Lower pharyngeal airway volume was also statistically significant (p=0.051) among 3 groups. Total pharyngeal airway volume did not show any significant correlation. Conclusion: Nasopharyngeal airway volume seems to play a role in different skeletal patterns.

Sign in / Sign up

Export Citation Format

Share Document