Effect of Headgear and Class II Traction on Upper Airway Dimensions and Hyoid Bone Position in Non-Extraction Patients with Class II Division 1 Malocclusion

Zheng, Bowen; Jiang, Zixi; Liu, Fan; An, Na; Zheng, Y. H.; Zhang, Yang; Liu, Yi

doi:10.2485/jhtb.24.1

Cited by 7 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both treatment modalities produced significant downward (AH-FH) and forward (AH-CV) displacements of the hyoid bone. The result corresponded with the previous studies [14,26,27] that during puberty, forward movement of the hyoid bone was carried by the chin, and downward movement was closely paralleled with growth of the vertebrae until adulthood.…”

Section: Resultssupporting

confidence: 92%

“…There were some significant differences of pretreatment characteristics between the two groups (Table 2). The extraction patients presented less retrusive mandible but more protrusive incisors corresponding with wider oropharyngeal airway (U-MPW, PASmin) and hy- ous study [14] that hypopharyngeal airway and tongue length increased in the Class II traction group. Significant forward position of the tongue was found in the non-extraction group.…”

Section: Resultsmentioning

confidence: 87%

“…The treatment effects on dento-skeleton and soft tissue profile have been thoroughly evaluated [12,13] but there are only few studies exploring the treatment effect upon pharyngeal airway. Zheng, et al [14] studied the effects of headgear with and without class II traction on the pharyngeal airway. Aksu, et al [15] compared the treatment effects between cervical headgear and activator on the pharyngeal airway.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pharyngeal Airway Changes Following Extraction versus Nonextraction Treatments of Class II Division 1 Growing Patients

Sukniyom¹,

Viteporn²

2019

Int J Oral Dent Health

View full text Add to dashboard Cite

Background: There are several treatment modalities for Class II division 1 malocclusion, but there are only few studies exploring the treatment effect upon pharyngeal airway. The study aimed to compare the effects of extraction versus non-extraction mechanics on pharyngeal airway after treatment of Class II division 1 malocclusion. Methods:The 60 Class II division 1 growing patients (whose mean age was 11.81 ± 0.79 years) were divided into Group I four first premolar extraction and Group II non-extraction with Class II traction. Skeletal development was evaluated from cervical vertebral maturation stages. Dento-skeleton and pharyngeal airway dimension were analyzed from consecutive lateral cephalograms before and after treatments. Significant differences within and between groups of the studied variables were evaluated by Paired-samples T test and Independent-Samples T test (p < 0.05), respectively.Results: Before treatment, the extraction group exhibited lower skeletal maturation, less retrognathic mandible, more protrusive incisors, wider oropharyngeal and hypopharyngeal airway, shorter soft palate and more anterior position of the tongue. Both treatments produced significant backward rotation of the mandible and retroclination of the upper incisors, downward and forward movement of hyoid bone. Significant increase of the nasopharyngeal and hypopharyngeal dimensions, soft palate length and thickness, tongue length and forward movement of the tongue were only found in the non-extraction group. Forward movement of the bony chin had significant correlations (p < 0.05) with the increase of hypopharyngeal dimensions, forward movement of the tongue and hyoid bone. Conclusions:Treatment of Class II division 1 malocclusion in growing patients by either extraction or non-extraction mechanics did not produce significant adverse effect on pharyngeal airway dimension. Non-extraction treatment with Class II traction tended to have a positive effect on the pharyngeal airway.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pharyngeal Airway Changes Following Extraction versus Nonextraction Treatments of Class II Division 1 Growing Patients

Sukniyom¹,

Viteporn²

2019

Int J Oral Dent Health

View full text Add to dashboard Cite

show abstract

“…The position of the hyoid bone is commonly determined by lateral cephalometric analysis, for purposes including maxillofacial surgery, diagnosis of sleep apnea, and analysis of skeletal patterns and occlusions [9][10][11] . Although cephalometric radiography is commonly used in orthodontic treatment, the modality remains rare ; routine dental care would benefit from precise identification of hyoid bone location using a more common modality, such as panoramic radiography.…”

Section: Introductionmentioning

confidence: 99%

Potential of Panoramic Radiography as a Screening Method for Oral Hypofunction in the Evaluation of Hyoid Bone Position

Kuroda

Matsuda

Ito

et al. 2019

Showa Univ J Med Sci

View full text Add to dashboard Cite

The hyoid bone is located in the middle of the cervical muscles involved in oral masticatory function. The position of the hyoid bone is commonly determined by lateral cephalometric analysis. Although cephalometric radiography is commonly used in orthodontic treatment, the modality remains rare ; routine dental care would bene t from precise identi cation of hyoid bone location using a more common modality, such as panoramic radiography. The purpose of this study was to investigate the usefulness of panoramic radiography compared to lateral cephalometric radiography for evaluating hyoid bone position as a potential screening method for oral hypofunction. The study included 347 patients referred for both a panoramic radiograph and a lateral cephalometric radiograph. The patients were divided into the following ve groups according to the appearance of the hyoid bone in the panoramic radiograph : Group 1 : hyoid bone could not be observed, or part of the greater horn was observed ; Group 2 : part of the hyoid body was observed, but not the most supero-anterior point of the hyoid bone ; Group 3 : the most supero-anterior point of the hyoid bone was observed ; Group 4 : all of the hyoid body was observed ; Group 5 : the hyoid body overlapped the mandible. The gold standard for measurement of hyoid bone position is the lateral cephalometric radiograph. Hyoid bone position as revealed by lateral cephalometric radiograph was compared among the groups. Hyoid bones that were observed in higher positions on lateral cephalometric radiograph were also observed in higher positions on panoramic radiograph. Hyoid bone position can be assessed by panoramic radiography, and this modality might be useful as a screening method for oral hypofunction.

show abstract

“…19 Therefore, the vertical length of the upper airway cannot be affected by wearing CHG. 19 The hyoid bone gradually moved forward and downward from mixed dentition to permanent dentition. 29…”

Section: Effect On the Hyoidmentioning

confidence: 99%

The effects of the headgear therapy on the airway dimensions in patients with class II malocclusion: A systematic review

Shavakhi¹,

Mohamadian²,

Najafi³

2019

Dent. Med. Probl.

View full text Add to dashboard Cite

Class II malocclusion may be caused by the maxillary protrusion or the mandibular retrusion. One treatment method is to use a headgear, which might affect the dimensions of the patient's airway. The aim of this study was to assess the effect of a headgear on the airway dimensions in class II malocclusion patients. A digital search and a manual search were conducted for English-language articles published from January 2000 to December 2018 about human clinical trials, including the usage of a cervical headgear in class II malocclusion patients who had measurable changes in the airway and/or jaw size. The synthesis methods of the study consisted of data concerning the study design, the type of treatment device, the patient's age at the start, the sample size, the treatment duration, the type of radiography, and the results of treatment; this data was extracted and compared. The quality of the selected articles was assessed. All of the studies had a high risk of bias, providing low-quality evidence of the effectiveness of the headgear therapy on the airway dimensions. The conclusions of the articles differed from each other and there were different mechanisms of changes in the jaw or airway dimensions. Therefore, further studies are required to find the clearest results showing the effect of a cervical headgear in class II malocclusion.

show abstract

Effect of Headgear and Class II Traction on Upper Airway Dimensions and Hyoid Bone Position in Non-Extraction Patients with Class II Division 1 Malocclusion

Cited by 7 publications

References 21 publications

Pharyngeal Airway Changes Following Extraction versus Nonextraction Treatments of Class II Division 1 Growing Patients

Pharyngeal Airway Changes Following Extraction versus Nonextraction Treatments of Class II Division 1 Growing Patients

Potential of Panoramic Radiography as a Screening Method for Oral Hypofunction in the Evaluation of Hyoid Bone Position

The effects of the headgear therapy on the airway dimensions in patients with class II malocclusion: A systematic review

Contact Info

Product

Resources

About