Evaluation of the airway space changes after extraction of four second premolars and orthodontic space closure in adult female patients with bimaxillary protrusion – A retrospective study

Al-Dosari, Mohammad A.; Alqasir, Abdulmohsen M.; Alqahtani, Nasser; Almosa, Naif; Almoammar, Khalid A.; Albarakati, Sahar F.

doi:10.1016/j.sdentj.2019.11.004

Cited by 10 publications

(11 citation statements)

References 25 publications

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“…Thirty-three articles were then selected for full-text assessment. After the full-text appraisal, 26 articles were excluded due to the following reasons: Article in a different language [30], sample age below 16 years old [24,[31][32][33][34], Different premolar extractions [35,36], Different anchorage designs [25,[37][38][39][40][41][42][43], Different malocclusion [44], Nonretrospective studies [16,19,22,[45][46][47][48][49][50]. Six eligible retrospective study articles were selected in this systematic review [20,22,23,[51][52][53].…”

Section: Resultsmentioning

confidence: 99%

“…When the research criteria excluded the maximum anchorage from the inclusion criteria, there was a consensus from the literature reviews that there was no strong correlation between extraction orthodontic treatment and reduction of the pharyngeal airway space [25,35]. Al Maaitah et al [25] was one of the articles which did not specify the type of mechanics used to close first premolar extraction spaces, which concluded there was no change in the upper airway space after the treatment.…”

Section: Discussionmentioning

confidence: 99%

“…An article from Aldosari et al [35] studied airway space changes after second premolar extractions. The study concluded an increase in the vertical airway length following extractions of second premolars but failed to describe the exact anchorage mechanics used in this study.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Four First Premolar Extraction on the Upper Airway Dimension in a NonGrowing Class I Skeletal Patients: A Systematic Review

Choi¹,

Lee²

2022

JOMDR

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Objective: Orthodontic treatment aims not only to treat one's malocclusion and facial aesthetics but also to maintain or improve the patient's airway patency. This review aims to evaluate post-treatment changes in the position of hyoid bone and oropharyngeal airway size and dimensions associated with fixed orthodontic treatment with four first bicuspid extractions in non-growing Class I skeletal bimaxillary protrusion individuals. Methods: Electronic databases including Embase, Web of Science, PubMed, and Scopus were used to research published articles. Included studies assessed the post-treatment effects of four first bicuspid extractions with maximum anchorage on pharyngeal airway dimensions in non-growing patients. Relevant data were obtained, summarised, and analysed from the included studies. © 2020 Terese Winslow LLC, U.S. Govt. has certain rights. OSA is one of the sleep-breathing disturbances caused by collapsing of the upper airway during sleep, characterised by cessation of airflow with persistent respiratory effort, oxygen de-saturations, sleep arousals and sleep fragmentation [4]. Although OSA is a multifactorial disorder associated with obesity, age, facial morphology, airway collapsibility, and neuromuscular feedback, the size of the oropharyngeal airway is highly associated with OSA severity [5-12].Results: Six articles were selected in this systematic review after meeting the requirements of the inclusion criteria. Conclusions: Four bicuspid extractions followed by maximum anchorage involves predominant retraction of the anterior segment of the arches in non-growing skeletal Class I bimaxillary protrusion cases. Extraction of four first premolars led to retraction of the anterior segment and the retroclination of anterior teeth, which narrowed the pharyngeal airway dimensions. After such treatment, the hyoid bone position changes remain inconclusive, which warrants further studies.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effects of Four First Premolar Extraction on the Upper Airway Dimension in a NonGrowing Class I Skeletal Patients: A Systematic Review

Choi¹,

Lee²

2022

JOMDR

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“…Most previous studies regarding the effects of extraction on the upper airway have been performed using lateral cephalography [ 6 – 8 , 14 , 15 ]. Sears et al found weak correlations between oropharynx linear and volume measurements, on the basis of lateral cephalogram and cone-beam computed tomography (CBCT) findings [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Oropharynx and hyoid bone changes in female extraction patients with distinct sagittal and vertical skeletal patterns: a retrospective study

et al. 2022

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Background Previous studies have reported inconsistent effects of premolar extraction on the oropharynx and hyoid bones. Currently, no strong evidence is available regarding the effect of extraction on upper airway size. Hence, the aim of this study was to analyse the effects of first premolar extraction on the oropharynx and hyoid bone positions in female adult patients, and further explored differences in oropharynx and hyoid bone changes among skeletal patterns. Methods The study population included 40 female adult patients who did not undergo extraction and 120 female adult patients who underwent extraction of four premolars; the including patients had four distinct sagittal and vertical skeletal patterns. Cone-beam computed tomography was performed before (T0) and after (T1) orthodontic treatment. Eight oropharynx variables and five hyoid bone variables were measured using Dolphin 3D Imaging software. Paired and independent t-tests were used to analyse measurements between timepoints and groups, respectively. Results The oropharynx volume increased significantly in the extraction group; changes did not differ significantly between extraction and non-extraction groups. Oropharynx variables did not differ significantly at T0 among the four skeletal pattern groups. After orthodontic extraction treatment, the oropharynx volume increased significantly in the class I-norm and class I-hyper subgroups, but not in the class II-norm and class II-hyper subgroups. Significant increases were observed in the oropharynx volume and most constricted axial area from T0 to T1 in the moderate retraction group, but not in the maximum retraction group. Extraction patients exhibited significant posterior movement of the hyoid, particularly among maximum retraction patients. Conclusions In female adult patients, first premolar extraction tends to increase the oropharynx size and cause posterior movement of the hyoid bone, particularly in skeletal class I patients. For skeletal class II and hyperdivergent patients with a narrow oropharynx, first premolar extraction does not negatively influence oropharynx size or hyoid bone position. The differences of oropharyngeal changes between moderate retraction patients and maximum retraction patients were not significant.

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“…Malocclusion affects aesthetic, chewing, pronunciation, and other functions. 1,2 It is mainly characterized by dislocation of teeth and abnormal arrangement of dental arches. 3,4 In addition, it also causes periodontal disease.…”

Section: Introductionmentioning

confidence: 99%

Orthodontic force prediction model of T-loop closing spring based on dynamic resistance model

Jiang

Chen

Huang

et al. 2020

Proc Inst Mech Eng H

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Malocclusion has been seriously endangering human oral function. The most effective and mature therapy is orthodontic treatment. But the relationship between the shape of the T-loop and the orthodontic force is unclear, and the precise mathematical model has not been established. In this article, the dynamic orthodontic force prediction model of the T-loop was established by analyzing the treatment process of the T-loop. The model was based on the dynamic resistance model of waxy dental jaw, the theory of beam deformation, and the deformation characteristics of the T-loop. In the experimental process, 11 kinds of orthodontic archwires were used as experimental samples, including 2 kinds of common archwire materials, 7 kinds of cross-sectional sizes, and 10 kinds of clearance distances. The T-loop was put into the extraction space and immersed in 75°C constant temperature water for 2 min. And the experimental data were measured and collected by the dynamic force measuring device. The experimental results show that the cross-sectional size and the clearance distance are positively correlated with the orthodontic force. The influence of the clearance distance on the orthodontic force is greater than that of the cross-section size. The deviation rates between the experimental values of orthodontic force and the theoretical values are between 1.10% and 9.09%, which verifies the accuracy of the dynamic orthodontic force prediction model. The model can predict the orthodontic force, improve the treatment effect, shorten the treatment cycle, and provide reference and guidance for orthodontists to carry out orthodontic treatment safely and effectively.

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Evaluation of the airway space changes after extraction of four second premolars and orthodontic space closure in adult female patients with bimaxillary protrusion – A retrospective study

Cited by 10 publications

References 25 publications

Effects of Four First Premolar Extraction on the Upper Airway Dimension in a NonGrowing Class I Skeletal Patients: A Systematic Review

Effects of Four First Premolar Extraction on the Upper Airway Dimension in a NonGrowing Class I Skeletal Patients: A Systematic Review

Oropharynx and hyoid bone changes in female extraction patients with distinct sagittal and vertical skeletal patterns: a retrospective study

Orthodontic force prediction model of T-loop closing spring based on dynamic resistance model

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