scholarly journals Three-Dimensional Evaluation of Cervical Vertebral Morphology in Skeletal Class II of Malocclusion in Egyptians

2017 ◽  
Vol 20 (1) ◽  
pp. 62-67
Author(s):  
Amr Ghazy ◽  
Waleed Refaat ◽  
Sherif Morcos
Keyword(s):  
Three Dimensional ◽  
Class Ii ◽  
Skeletal Class ◽  
Skeletal Class Ii

scholarly journals Nonsurgical and nonprosthetic camouflage treatment of skeletal Class II open bite with bilaterally missing lower first molars

2018 ◽  
Vol 89 (3) ◽  
pp. 505-517. ◽  
Author(s):  
Tung Nguyen ◽  
Eui Seon Baek ◽  
Soonshin Hwang ◽  
Kyung-Ho Kim ◽  
Chooryung J. Chung
Keyword(s):  
Treatment Outcome ◽  
Three Dimensional ◽  
Class Ii ◽  
Open Bite ◽  
Third Molars ◽  
Second Molar ◽  
Skeletal Class ◽  
Long Term Stability ◽  
Skeletal Class Ii

ABSTRACT This report illustrates the successful nonsurgical and nonprosthetic camouflage treatment of a skeletal Class II open bite malocclusion combined with missing mandibular first molars bilaterally. In the mandible, the second and third molars were uprighted and protracted, substituting for the missing first molars. In the maxilla, anterior bodily retraction and full-arch intrusion were achieved following premolar and second molar extraction, which also induced autorotation of the mandible. The treatment outcome and prognosis were confirmed with three-dimensional superimposition techniques, along with long-term stability.

scholarly journals Three-dimensional effects of the mini-implant–anchored Forsus Fatigue Resistant Device: A randomized controlled trial

2015 ◽  
Vol 86 (2) ◽  
pp. 292-305 ◽  
Author(s):  
Sherif A. Elkordy ◽  
Amr M. Abouelezz ◽  
Mona M. Salah Fayed ◽  
Khaled H. Attia ◽  
Ramy Abdul Rahman Ishaq ◽  
...  
Keyword(s):  
Controlled Trial ◽  
Three Dimensional ◽  
Class Ii ◽  
Control Group ◽  
Skeletal Class ◽  
Skeletal Class Ii ◽  
Skeletal Effects ◽  
Implant Anchorage ◽  
Mandibular Incisors ◽  
Forsus Fatigue Resistant Device

ABSTRACT Objective:  To detect three-dimensionally the effects of using mini-implant anchorage with the Forsus Fatigue Resistant Device (FFRD). Materials and Methods:  The sample comprised 43 skeletal Class II females with deficient mandibles. They were randomly allocated into three groups: 16 patients (13.25 ± 1.12 years) received FFRD alone (Forsus group), 15 subjects (13.07 ± 1.41 years) received FFRD and mini-implants (FMI group), and 12 subjects (12.71 ± 1.44 years) were in the untreated control group. Three-dimensional analyses of cone beam computed tomographic images were completed, and the data were statistically analyzed. Results:  Class I relationship and overjet correction were achieved in 88% of the cases. None of the two treatment groups showed significant mandibular skeletal effects. In the FMI group, significant headgear effect, decrease in maxillary width, and increase in the lower facial height were noted. In the FMI group, retroclination of maxillary incisors and distalization of maxillary molars were significantly higher. Proclination and intrusion of mandibular incisors were significantly greater in the Forsus group. Conclusions:  FFRD resulted in Class II correction mainly through dentoalveolar effects and with minimal skeletal effects. Utilization of mini-implant anchorage effectively reduced the unfavorable proclination and intrusion of mandibular incisors but did not produce additional skeletal effects.

scholarly journals Three-Dimensional Evaluation of Soft Tissues in Hyperdivergent Skeletal Class II Females in Guangdong

2021 ◽  
Author(s):  
Xueqin Zhang ◽  
Jianqing Deng ◽  
Zhaoxiang Wen ◽  
Zhengyuan Chen ◽  
Liyi Gan ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Three Dimensional ◽  
Morphological Characteristics ◽  
Class Ii ◽  
Hard Tissue ◽  
Facial Soft Tissue ◽  
Linear Measurements ◽  
Skeletal Class ◽  
Adult Females ◽  
Skeletal Class Ii

Abstract Background: To establish the three-dimensional facial soft tissue morphology of adolescent and adult females in the Guangdong ethnic group and to study the morphological characteristics of hyperdivergent skeletal class Ⅱ females in Guangdong compared with the characteristics of normal groups.Materials and Methods: The 3dMDface system was used to capture face scans of 160 patients, including 45 normal and 35 hyperdivergent skeletal class II adolescents (aged 11–14 years old) and 45 normal and 35 hyperdivergent skeletal class II adults (aged 18–30 years old). Thirty-two soft tissue landmarks were mapped, and 21 linear, 10 angular and 17 ratio measurements were obtained by 3dMDvultus analysis software. Data were assessed with a t-test of two independent samples between the normal adolescent and adult groups and between the normal and hyperdivergent skeletal class II groups.Results: The linear measurements of the Guangdong adult females were larger than those of the adolescents. However, the angular and ratio measurements had little difference. The vertical linear measurements were higher and the sagittal and transverse linear measurements were smaller in the hyperdivergent class II group (p<0.05). The soft tissue ANB angle, chin-lip angle, and mandibular angle were significantly larger and the soft tissue facial convexity angle and nasal convexity angle were significantly smaller in the hyperdivergent class II group (p<0.05). Additionally, there were significant differences in the ratio measurements between the hyperdivergent class II groups and the control groups (p<0.05).Conclusions: The three-dimensional facial morphology of Guangdong adolescent and adult females was acquired. The facial soft tissue measurements of the adults were higher in height, width and depth, suggesting that from the adolescent to adult period, facial soft tissue grows in three dimensions. However, the facial convexity and proportional relationships were similar, suggesting that the growth pattern remained the same. The three-dimensional facial soft tissue features of hyperdivergent skeletal class II were characterized by the terms “long, convex, and narrow”, which was similar to the hard tissue features of hyperdivergent skeletal class II seen in previous studies. Three-dimensional facial measurements can reflect intrinsic hard tissue characteristics.

Two-dimensional versus three-dimensional Frӓnkel Manoeuvre: a reproducibility study

2019 ◽  
Vol 42 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Roberto Rongo ◽  
Rosaria Bucci ◽  
Raffaella Adaimo ◽  
Massimo Amato ◽  
Stefano Martina ◽  
...  
Keyword(s):  
Gold Standard ◽  
Three Dimensional ◽  
Class Ii ◽  
Observer Agreement ◽  
3D Analysis ◽  
Two Dimensional ◽  
Skeletal Class ◽  
Reproducibility Study ◽  
Skeletal Class Ii ◽  
3D Scans

Summary Background/Objectives To assess intra- and inter-observer reproducibility of the evaluation of the Frӓnkel Manoeuvre (FM) on three-dimensional (3D) scans and to compare it to the assessment on two-dimensional (2D) pictures. Materials/Methods This study included 44 individuals with a skeletal Class II malocclusion [9–16-years old mean age ± standard deviation: 13.5 ± 2.01 years]. All patients had a full Class II molar relationship, overjet ≥6 mm and point A, Nasion, point B angle (ANB) ≥5 degrees. During the FM, each patient was invited to bite in centric occlusion and then to posture the mandible forward to reach a Class I molar relationship. The FM was recorded both by a normal camera and a 3D scanner (3dMD system). Six examiners divided into two groups according to their orthodontic clinical experience (&lt;5 and &gt;10 years), and one gold standard in the evaluation of FM, commented twice (every 15 days) on both 2D photographs (T0 and T2) and 3D scans (T1 and T3). The intra-observer agreement and the inter-observer agreement compared to the gold standard were evaluated by computing the Cohen’s K. Results The agreement between observations for each examiner ranged from 0.36 to 1 on 2D pictures (T0 versus T2), and from 0.22 to 0.69 on 3D scans (T1 versus T3). The overall agreement was 0.63 (95 per cent CI = 0.35–0.91) in 2D analysis and 0.5 (95 per cent CI = 0.35–0.64) in 3D analysis. Conclusions/Implications The FM was less reproducible when performed on 3D records than on 2D pictures.

scholarly journals A Three Dimensional Study of Upper Airway in Adult Skeletal Class II Patients with Different Vertical Growth Patterns

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e95544 ◽  
Author(s):  
Tianhu Wang ◽  
Zhenhua Yang ◽  
Fang Yang ◽  
Mingye Zhang ◽  
Jinlong Zhao ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Upper Airway ◽  
Class Ii ◽  
Growth Patterns ◽  
Skeletal Class ◽  
Vertical Growth ◽  
Skeletal Class Ii

scholarly journals Cone-beam evaluation of pharyngeal airway space in adult skeletal Class II patients with different condylar positions

2018 ◽  
Vol 89 (2) ◽  
pp. 312-316
Author(s):  
Jintao Xu ◽  
Ruonan Sun ◽  
Linna Wang ◽  
Xiaoying Hu
Keyword(s):  
Null Hypothesis ◽  
Three Dimensional ◽  
Class Ii ◽  
Cone Beam ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Skeletal Class Ii ◽  
Posterior Group ◽  
Significant Difference ◽  
Anterior Group

ABSTRACT Objectives: To test the null hypothesis that there is no significant difference in pharyngeal airway space among adult skeletal Class II patients with different condylar positions using cone-beam computed tomography (CBCT). Materials and Methods: The CBCT records of 60 patients with skeletal Class II malocclusion (ANB angle ≥ 4°, Wits ≥ 0) were selected from the CBCT database. According to the condyle position, the patients were divided in three groups: anterior group (CD ≤ −12%), centric group (−12% ≤ CD ≤ +12%), and posterior group (CD ≥ +12%). Three-dimensional (3D) pharyngeal airway models were reconstructed using InvivoDental software 5.1.3. The volume and area of the pharyngeal airway space were measured in the 3D airway model. Results: The volume and area of the pharyngeal airway space in the centric group were significantly smaller than those in the posterior group (P &lt; .01). The volume and area of the pharyngeal airway space were smallest in the anterior group and significantly increased in the centric and posterior groups (P &lt; .001). Conclusions: The null hypothesis was rejected. Significant differences were noted in pharyngeal airway space among adult skeletal Class II patients with different condylar positions.

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