scholarly journals Reliability of cone beam CT for morphometry of nasolabial soft tissue in patients with skeletal class III malocclusion: A qualitative and quantitative analysis

2021 ◽  
pp. 1-12
Author(s):  
Wenjie Xu ◽  
Rui Lu ◽  
Yun Hu ◽  
Li Cao ◽  
Tao Wang ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Absolute Difference ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Lower Lip ◽  
Skeletal Class ◽  
Length Measurements ◽  
Angular Measurements

OBJECTIVE: To assess reliability of cone-beam CT (CBCT) for nasolabial soft tissue measurements in patients with skeletal class III malocclusion based on 3-dimensional (3D) facial scanner results. METHODS: CBCT and 3D facial scan images of 20 orthognathic patients are used in this study. Eleven soft tissue landmarks and 15 linear and angular measurements are identified and performed. For qualitative evaluation, Shapiro-Wilk test and Bland-Altman plots are applied to analyze the equivalence of the measurements derived from these two kinds of images. To quantify specific deviation of CBCT measurements from facial scanner, the latter is set as a benchmark, and mean absolute difference (MAD) and relative error magnitude (REM) for each variable are also calculated. RESULTS: Statistically significant differences are observed in regions of nasal base and lower lip vermilion between two methods. MAD value for all length measurements are less than 2 mm and for angular variables <  8°. The average MAD and REM for length measurements are 0.94 mm and 5.64%, and for angular measurements are 2.27° and 3.78%, respectively. CONCLUSIONS: The soft tissue results measured by CBCT show relatively good reliability and can be used for 3D measurement of soft tissue in the nasolabial region clinically.

Reliability of Cone Beam CT for Morphometry of Nasolabial Soft Tissue in Patients with Skeletal Class III Malocclusion: A Qualitative and Quantitative Analysis

2021 ◽  
Author(s):  
Wenjie Xu ◽  
Rui Lu ◽  
Yun Hu ◽  
Li Cao ◽  
Tao Wang ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Absolute Difference ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Lower Lip ◽  
Skeletal Class ◽  
Length Measurements ◽  
Angular Measurements

Abstract Background：Precise measurement of the morphological structure of soft and hard tissues is fundamental to the treatment of malocclusion, but the ability of cone beam CT(CBCT) for soft tissue measurements involves few studies to date. The purpose of this study was to assess the reliability of CBCT for nasolabial soft tissue measurements in patients with skeletal class III malocclusion based on 3-dimensional(3D) facial scanner results.Methods：CBCT and 3D facial scan images of 20 orthognathic patients were used in this study. 11 soft tissue landmarks and 15 linear and angular measurements were identified and performed. For qualitative evaluation, Shapiro-Wilk Test and Bland-Altman plots were applied to analyze the equivalence of the measurements derived from these two kinds of data. To quantify specific deviation of CBCT measurements from facial scanner, the latter were set as a benchmark, and mean absolute difference(MAD) and relative error magnitude(REM) for each variable were calculated.Results：Statistically significant differences were observed on length measurements of bilateral philtrum crests, width of mouth and angular measurements of the protrusion angle of lower lip, left angle of upper mouth and nasolabial angle between the two methods. The MAD value for all length measurements were less than 2 mm and for angular variables <8°. The average MAD and REM for length measurements was 0.94mm and 5.64% respectively, and 2.27°, 3.78% for angular measurements.Conclusions：Certain inconformity exists in regions of nasal base and lower lip vermilion between CBCT and facial scanner when measuring nasolabial surfaces, but most of them are clinically acceptable. The soft tissue results measured by CBCT showed relatively good reliability and can be used for 3D measurement of soft tissue in the nasolabial region clinically.

scholarly journals Orthodontic camouflage of skeletal Class III malocclusion with miniplate: a case report

2016 ◽  
Vol 21 (4) ◽  
pp. 89-98 ◽  
Author(s):  
Marcel Marchiori Farret ◽  
Milton M. Benitez Farret ◽  
Alessandro Marchiori Farret
Keyword(s):  
Orthognathic Surgery ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Lower Lip ◽  
Facial Profile ◽  
Skeletal Class ◽  
Mandibular Teeth ◽  
One Year ◽  
Angle Class Iii Malocclusion

ABSTRACT Introduction: Skeletal Class III malocclusion is often referred for orthodontic treatment combined with orthognathic surgery. However, with the aid of miniplates, some moderate discrepancies become feasible to be treated without surgery. Objective: To report the case of a 24-year-old man with severe skeletal Angle Class III malocclusion with anterior crossbite and a consequent concave facial profile. Methods: The patient refused to undergo orthognathic surgery; therefore, orthodontic camouflage treatment with the aid of miniplates placed on the mandibular arch was proposed. Results: After 18 months of treatment, a Class I molar and canine relationship was achieved, while anterior crossbite was corrected by retraction of mandibular teeth. The consequent decrease in lower lip fullness and increased exposure of maxillary incisors at smiling resulted in a remarkable improvement of patient's facial profile, in addition to an esthetically pleasing smile, respectively. One year later, follow-up revealed good stability of results.

Soft tissue changes after a mandibular osteotomy for symmetric skeletal class III malocclusion

Odontology ◽  
2016 ◽  
Vol 105 (3) ◽  
pp. 375-381
Author(s):  
Seigo Ohba ◽  
Haruka Kohara ◽  
Takamitsu Koga ◽  
Takako Kawasaki ◽  
Kei-ichirou Miura ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Mandibular Osteotomy ◽  
Skeletal Class ◽  
Tissue Changes ◽  
Soft Tissue Changes

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.

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