Morphological Characteristics of the Cranial Base in Sagittal Malocclusion

Liu, Yi; Liu, Fan; Zheng, Y. H.; Yu, Xin

doi:10.2485/jhtb.22.249

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…Contrary to our study, Liu, et al19 from Shenyang, China (n=56) concluded that SBa length (mm) was significantly larger in Class II (48.76 mm±3.93) than Class I (45.38 mm±3.95), and it was smaller in Skeletal class III (43.76 mm±2.43) as compared to class I. Also, Panainte et al17 from Tîrgu Mure�, Romania (n=44) found SBa length (mm) to be significantly larger in Class II (44.88±3.25) than Class I (42.8±2.5).…”

contrasting

confidence: 99%

Comparison of Two Cranial Base Lengths and Four Angles Among Three Sagittal Skeletal Bases in Adult Population of District Peshawar, Pakistan

Meena

Afridi

Shah

et al. 2022

GJMS

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Background: Research has shown that cranial base length, flexure and inclination play a role in the skeletal malocclusion in sagittal and vertical dimensions. The objectives of this study were to compare the two cranial base lengths and four angles among three sagittal skeletal bases in adult population of district Peshawar, Pakistan. Material & Methods: This cross-sectional study was conducted in the Department of Orthodontics, Khyber College of Dentistry, Peshawar, Pakistan from February 2020 to March, 2020. Ninety lateral cephalograms were selected for the year 2019 from the database of department, with 30 from each group; Skeletal Class I, II and III. SN length (mm), SBa length (mm), N-S-Ba, N-S-Ar, SN-FH and SBa-FH were our ratio variables and were described by mean, range and SD with 95% CI for mean. Twelve hypotheses were tested each by one-way ANOVA and when it showed significant difference, then by post hoc Dunnett’s t test. Results: Results: The sample included 90 cephalograms; 30 each in Class I, II and III, including 38 men and 52 women with mean age 22.54±5.70 years. SN length (mm) was similar in Class II 68.1±2.15 and Class III 68.7±2.01 to Class I (control) 68.4±1.56 (p=.487). SBa length was similar in Class II 45.5±2.48 and Class III 44.9±2.23 to Class I 44.6±1.76 (p=.281). N-S-Ba angle was similar in Class II 126.7o±2.26 and Class III 127.3o±2.70 to Class I 127.1o±2.22 (p=.614). N-S-Ar angle was significantly greater (p<.0001) in Class II 128.2o±2.45 than Class I 123.3o±1.97, and significantly greater (p=.030) in Class III 124.6o±1.70 than Class I. SN-FH angle was similar (p=.193) in Class II 7.9o±1.32 to Class I 7.4o±1.40 and similar (p=.356) in Class III 7.0o±0.94 to Class I. SBa-FH angle was similar in Class II 57.3o±2.19 and Class III 56.8o±1.45 to Class I 56.1o±1.90 (p=.058). Conclusions: Anterior cranial base length (SN length), posterior cranial base length (SBa length), N-S-Ba angle, SN-FH angle and SBa-FH angle were similar in Skeletal Class II to Class I and in Class III to Class I. N-S-Ar angle was greater in Skeletal Class II than Class I and in Class III than Class 1.

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contrasting

confidence: 99%

Comparison of Two Cranial Base Lengths and Four Angles Among Three Sagittal Skeletal Bases in Adult Population of District Peshawar, Pakistan

Meena

Afridi

Shah

et al. 2022

GJMS

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“…More and more orthodontists used appliances to improve facial esthetics that don't have serious crowding and protrusion. Some clinicians are dedicated to using extraoral traction 2,3) , whereas others, because of problems related to compliance, prefer intermaxillary or intramaxillary appliances.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Liu

et al. 2015

J. Hard Tissue Biology.

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Abstract:Our aim was to analyze the effect of headgear on upper airway dimension and hyoid bone position on non-extraction patients with Class II division 1 malocclusion. Ninety patients with Class II division 1 malocclusion were included and divided into three groups (Group A: treated with headgears and Class II traction; Group B: performed with Class II traction; and Group C: no treatment). The lateral projection was measured at the beginning and end of treatment. Cephalometric analyses of the dentofacial structure, upper airway dimension and hyoid bone position were performed before and after treatment. The data were analyzed by paired t-test and independent sample t-test. SNA significantly decreased in Group A after treatment (P<0.01), and SNB, ANB and Wits significantly changed in Group A and Group B. L1-MP, L1-NB and Z angle significantly increased, while overjet, overbite and lower lip measurements significantly decreased in Group A and Group B. In upper airway measurements, V-LPW, PNS-V, PNS-U and T-V significantly increased for three groups. Moreover, the hyoid bone position had a change in Group A and Group B. The upper airway dimensions were not decreased by headgear treatment or Class II traction in patients with Class II division 1 malocclusion. Class II traction treatment affected the position of the hyoid bone.

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“…Many patients with mandibular retrognathia present with symptoms of obstructive sleep apnea because of a narrowing of the pharyngeal airway 2) . For this reason, many reports have been made on the relationship between the skeleton and airway morphology of patients with mandibular micrognathia 3,4) . We think that the orthognathic surgery is useful if the treatment can prevent the develop of OSA in the future.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cranial Change on Oropharyngeal Airway and Breathing During Sleep

Nakano

Mishima

Suga

et al. 2020

J. Hard Tissue Biology.

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Mandibular micrognathia is one of the characteristics of obstructive sleep apnea syndrome. The purpose of this study was to assess the effects of bimaxillary surgery without maxillary advancement on the upper airway using computational fluid dynamics (CFD) results of comparing pre-and post-operative finite element model. Seven female patients with jaw deformity, who underwent two-jaw surgery (Le Fort1 osteotomy and bilateral sagittal split ramus osteotomy; BSSRO) were enrolled. Maxillary was moved for correcting occlusal plane and mandibular was moved to advancement. Pharyngeal airway space and breathing during sleep were evaluated, comparing the periods of 2 days before and 6 months after the operation. The cross-sectional area of the level of the hard palate (HP) and the level of the tip of the uvula (TU), and airway volume of total, HP-TU, and TP-the level of the base of the epiglottis (BE) were increased. AI and AHI in 2 days before and 6 months after were decreased. As the result of nasal ventilation condition, velocity of HP and TU in 2 days before and 6 months after were decreased. We think that it was revealed that movement of the maxilla without advancement did not affect to the morphology and function of airway.

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Morphological Characteristics of the Cranial Base in Sagittal Malocclusion

Cited by 7 publications

References 12 publications

Comparison of Two Cranial Base Lengths and Four Angles Among Three Sagittal Skeletal Bases in Adult Population of District Peshawar, Pakistan

Comparison of Two Cranial Base Lengths and Four Angles Among Three Sagittal Skeletal Bases in Adult Population of District Peshawar, Pakistan

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

The Effect of Cranial Change on Oropharyngeal Airway and Breathing During Sleep

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