scholarly journals Changes in the oropharyngeal airway of Class II patients treated with the mandibular anterior repositioning appliance

2015 ◽  
Vol 86 (6) ◽  
pp. 955-961 ◽  
Author(s):  
Susan Rizk ◽  
Valmy Pangrazio Kulbersh ◽  
Riyad Al-Qawasmi
Keyword(s):  
Hyoid Bone ◽  
Cervical Vertebrae ◽  
Statistical Significance ◽  
Control Sample ◽  
Class Ii ◽  
Maturation Stage ◽  
Functional Appliance ◽  
Oropharyngeal Airway ◽  
T1 And T2 ◽  
Airway Dimensions

ABSTRACT Objective: To evaluate the effects of functional appliance treatment on the oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position of growing Class II patients. Materials and Methods: Twenty Class II white patients (mean age, 11.7 ± 1.75 years) treated with the MARA followed by fixed appliances were matched to an untreated control sample by cervical vertebrae maturation stage at pretreatment (T1) and posttreatment (T2) time points. Cone beam computed tomography scans were taken at T1 and T2. Dolphin3D imaging software was used to determine oropharyngeal airway volume, dimensions, and anteroposterior hyoid bone position. Results: Multivariate ANOVA was used to evaluate changes between T1 and T2. Oropharyngeal airway volume, airway dimensions, and A-P position of the hyoid bone increased significantly with functional appliance treatment. SNA and ANB decreased significantly in the experimental group (P ≤ .05). Changes in SNB and Sn-GoGn failed to reach statistical significance. Conclusions: Functional appliance therapy increases oropharyngeal airway volume, airway dimensions, and anteroposterior hyoid bone position in growing patients.

Effects of Orthodontic Functional Appliances in Relation to Skeletal Maturation of Cervical Vertebrae in Class II Malocclusion

2021 ◽  
Vol 45 (5) ◽  
pp. 352-358
Author(s):  
Francisco Guinot ◽  
Marina Ferrer ◽  
Lara Díaz-González ◽  
Cristina García ◽  
Isabel Maura
Keyword(s):  
Cervical Vertebrae ◽  
Class Ii ◽  
Skeletal Maturation ◽  
Maturation Stage ◽  
Orthodontic Appliances ◽  
Skeletal Class Ii ◽  
Lateral Cephalograms ◽  
Functional Appliances ◽  
T1 And T2 ◽  
Mandibular Incisors

Aim: To evaluate the effects produced by functional orthodontic appliances at dental and skeletal level in relation to the level of skeletal maturation in class II patients. Study design: Longitudinal and observational study. Patients selected for the study had been wearing Sander Bite Jumping Appliance (SBJA) for at least 12 months; they were first diagnosed (T1) with skeletal class II according to Ricketts’ cephalometric analysis, and had had lateral cephalograms taken before and after orthopaedic treatment (T2). Variables studied at T1 and T2 were: facial convexity, inclination of the upper and lower incisors, and facial depth. Results were compared between T1 and T2 for each variable and in relation to cervical maturation stage (CVS) according to the Lamparski analysis. Statistical analysis was performed using Shapiro–Wilk, t-student, Analysis of Variance (ANOVA) and multiple comparison tests, taking as statistically significant a p-value <0.05. Results: A final sample of 235 patients was obtained. Statistically significant differences were found in the inclination of the mandibular incisors between T1 and T2 and among the different cervical stages when the functional appliances were placed in CVS1 (p = 0.000), CVS2 (p = 0.04) or CVS5 (p = 0.048). For the remaining variables, significant differences were also found between T1 and T2, but these differences were similar in all cervical stages. Conclusions: A significant proclination of the mandibular incisors was found when the functional appliance was placed during CVS1, CVS2, or CVS5. Time of placement of the functional appliances was not statistically significant for the remaining variables studied.

Changes in airway dimensions and hyoid bone position following class II correction with forsus fatigue resistant device

2015 ◽  
Vol 20 (7) ◽  
pp. 1747-1755 ◽  
Author(s):  
Nehir Canigur Bavbek ◽  
Burcu Balos Tuncer ◽  
Cagri Turkoz ◽  
Cagri Ulusoy ◽  
Cumhur Tuncer
Keyword(s):  
Hyoid Bone ◽  
Class Ii ◽  
Airway Dimensions ◽  
Forsus Fatigue Resistant Device

scholarly journals Growth Modification in Class II Malocclusion: A Review

2015 ◽  
Vol 4 (2) ◽  
pp. 23-26
Author(s):  
Sufia Nasrin Rita ◽  
SM Anwar Sadat
Keyword(s):  
Soft Tissues ◽  
Cervical Vertebrae ◽  
Class Ii ◽  
Treatment Modalities ◽  
Optimal Time ◽  
Maturation Stage ◽  
Class Ii Malocclusion ◽  
Skeletal Class ◽  
Skeletal Class Ii ◽  
Growth Modification

Class II malocclusion is the condition in which the mandibular first molars occlude distal to the normal relationship with the maxillary first molar. The etiology of class II malocclusion varied between skeletal, soft tissues, dental factors and habits. Skeletal class II could be because of protrusion of maxilla, retrusion of mandible and combination of both. The treatment modalities of any skeletal problem include Growth modification, Dental camouflage and Orthognathic surgery. The optimal time for treatment of patients with Class II malocclusions therapy should be initiated at the beginning of cervical vertebrae maturation stage CS3 to maximize the treatment effects. Age of treatment is approximately 8-14 years. The growth modification of moderate to severe skeletal class II malocclusion can be done by head gear, bionator, activator, twin block, herbest appliance, Frankel II regulator. The ultimate goal of growth modification depends on treatment timing, length of treatment, working mechanism of appliance, patient’s skeletal and dental condition we want to treat and the compliance of the patient.Update Dent. Coll. j: 2014; 4 (2): 23-26

scholarly journals Cephalometric Evaluation of Nasopharyngeal Airway and Hyoid Bone Position in Subgroups of Class II Malocclusions

2020 ◽  
pp. 290-302
Author(s):  
Muhammed Hilmi Buyukcavus ◽  
Gönül Kocakara
Keyword(s):  
Hyoid Bone ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Skeletal Class ◽  
Skeletal Class Ii ◽  
Retrospective Clinical Study ◽  
Significant Difference ◽  
Nasopharyngeal Airway ◽  
Mandibular Retrognathia ◽  
Airway Dimensions

The aim of the study is to evaluate pharyngeal airway dimensions and hyoid bone position according to different Class II malocclusion types in Turkish population. Materials and Methods: The retrospective clinical study consisted of patients divided into 3 subgroups with skeletal Class II malocclusion. A total of 221 individuals (131 females and 90 males) were included in the study. Individuals with skeletal Class II malocclusion were divided into three subgroups as maxillary prognathia, mandibular retrognathia and combined. In the cephalometric analysis; 8 nasopharyngeal, 7 oropharyngeal, 2 hypopharyngeal, 9 hyoid measurements and 4 area measurements were used. The distribution of sex and growth-development stages of the patients were compared with the Pearson chi-square test. One-way ANOVA was used to evaluate patients. Tukey Post-Hoc tests were used for bilateral comparisons for significant parameters. SPSS package program was used for data analysis. Results were considered statistically significant at p<0.05 significance level. Results: According to findings, there was no significant difference between the groups in nasopharyngeal airway and area measurements (p>0.05). When the position of the hyoid bone was evaluated, a statistically significant difference was found between the three groups in the measurements of Hy-Pg (mm) (p<0.05). Conclusion: Linear and areal nasopharyngeal airway dimensions are similar in subgroups of Class II malocclusions, while the distance of the hyoid bone from the pogonion is less in the mandibular retrognathia group.

scholarly journals Comparison of Pharyngeal Airway between Mandibular Setback Surgery Patients (Skeletal Class III) and Nonsurgery Patients (Skeletal Classes I and II)

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Jung-Hsuan Cheng ◽  
Chun-Ming Chen ◽  
Ping-Ho Chen ◽  
Szu-Ting Chou ◽  
Chin-Yun Pan ◽  
...  
Keyword(s):  
Hyoid Bone ◽  
Class Ii ◽  
Class I ◽  
Class Iii ◽  
Pharyngeal Wall ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Mandibular Setback ◽  
Mandibular Setback Surgery ◽  
Airway Dimensions

Purpose. We investigated the pharyngeal airway dimensions and their correlations in patients who underwent mandibular setback surgery versus those who did not. Materials and Methods. One hundred and sixty cephalometric radiographs (120 patients) were obtained from patients with three skeletal malocclusion classifications: Class I and Class II in the nonsurgery group and Class III in the surgery group (preoperative and postoperative cephalograms). The following dimensions were measured: nasopharyngeal airway (NOP), uvulopharyngeal airway (UOP), shortest distance from the posterior tongue to the pharyngeal wall (TOP), and distance from the epiglottis to the pharyngeal wall (EOP). Paired t test, one-way analysis of variance, and Pearson correlation coefficients were used for statistical analysis. Results. Preoperatively, UOP and TOP of skeletal Class III patients (15.2 mm and 16.6 mm) were significantly larger than those of skeletal Class II (11.5 mm and 12 mm) and Class II (12.3 mm and 12.9 mm) patients, respectively. No differences were observed in EOP between the three skeletal patterns. The hyoid bone of Class III patients was significantly anterior to that of Class I/II patients. Furthermore, UOP had a moderate negative correlation with soft palate length. Postoperatively, no significant difference (UOP, TOP, EOP, soft palate width, and hyoid bone) was found between the skeletal classes. Conclusion. Preoperatively, UOP and TOP of skeletal Class III patients were significantly wider than those of skeletal Class I/II patients. Pre- and postoperatively, EOP did not exhibit significant differences among the three skeletal classifications. No differences were found in all postoperative pharyngeal airway dimensions between Class III patients and nonsurgery patients (Class I and Class II).

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