Analysis of Three-Dimensional Morphological Differences in the Mandible between Skeletal Class I and Class II with CBCT Fixed-Point Measurement Method

Dong, Qiang; Shi, HaoYu; Jia, Qi; Tian, Yueyi; Zhi, Kangkang; Zhang, Lu

doi:10.1155/2021/9996857

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…In the present study, ramal height (Ar-Go) was smaller in the Class II skeletal relationship compared with the Class I and Class III groups, whereas it was similar between Class I and Class III subjects. This was in agreement with Dong et al, 33 who found that patients with a Class II skeletal relationship tended to have smaller ramal height (Co-Go) when compared with Class I subjects.…”

Section: Discussionsupporting

confidence: 92%

Cranial base measurements in different anteroposterior skeletal relationships using Bjork-Jarabak analysis

Maaitah¹,

Alomari²,

Al-Khateeb³

et al. 2022

The Angle Orthodontist

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Objectives To assess the linear and angular cranial base measurements (Bjork polygon) in different anteroposterior (AP) skeletal relationships using Bjork-Jarabak analysis. Materials and Methods Pretreatment lateral cephalograms of 288 (146 women, 142 men, mean ages 21.24 ± 2.72 years and 22.94 ± 3.28 years, respectively) adult patients were divided into Class I, II, and III skeletal relationships according to their ANB angle. Linear and angular measurements of Bjork polygon were measured and compared among different skeletal relationships. Analysis of variance was performed to detect the differences among groups. Independent-sample t-test was used to detect differences between men and women. Results The Class II skeletal relationship has a significantly larger saddle angle than Class III does (P < .05), whereas Class III has a significantly larger gonial angle than Class II does (P < .05). The articular angle and sum of Bjork polygon angles were not significantly different among groups (P > .05). Anterior (N-S) and posterior (S-Ar) cranial base lengths were similar in the different AP skeletal relationships (P > .05). The ramal height and body of the mandible length were significantly larger in Class III compared with Class I and II (P < .05). Women had a significantly larger articular angle than men did (P < .05), although men had significantly larger linear measurements of Bjork polygon than women did (P < .05). Conclusions The Class III skeletal relationship has a smaller saddle angle and larger mandibular length and gonial angle. Men have a larger cranial base and mandibular linear measurements and a smaller articular angle compared with women.

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Section: Discussionsupporting

confidence: 92%

Cranial base measurements in different anteroposterior skeletal relationships using Bjork-Jarabak analysis

Maaitah¹,

Alomari²,

Al-Khateeb³

et al. 2022

The Angle Orthodontist

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“…The current study observed that ramal height was shorter in individuals with a Class II skeletal relationship, whereas mandibular body length was longer in those with a Class III skeletal relationship, in comparison to Class II. These results were in line with earlier investigations, such as those conducted by Dong et al and Gasgoos et al [20,21]. Furthermore, the present study noted that the mandible exhibited greater size within the Class III group, a finding consistent with previous research [21][22][23].…”

Section: Discussionsupporting

confidence: 94%

Bjork-Jarabak Analysis in Different Anteroposterior Skeletal Relationship: A Comparative Study

Hashim,

AL-Sayed,

Gsouma

et al. 2023

Oral Health Dental Sci

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Aims: This study aimed to evaluate cranial base measurements in individuals with different skeletal relationships (class I, II, and III) using Bjork-Jarabak analysis and compare them with existing research. Material and Method: Lateral cephalograms of 103 Sudanese participants (aged 18-22) were assessed, grouped by ANB angle. Results: Showed no significant differences between class I and II, or class I and III skeletal relationships. However, class II and III relationships exhibited significant differences in Articulare angle, Gonial angle, ramal height, and mandibular length (P<0.0001). Discrepancies in craniofacial morphology were observed between Sudanese and Bjork-Jarabak norms for Caucasian. Conclusion: Saddle angle, Bjork sum of angles, and cranial case showed no significant differences among skeletal classes, but significant differences in several measurements existed between class II and III relationships.

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“…The growth of the ramus height is mainly determined by the new bone deposition on the mandibular condyle, which involves highly complicated environmental and genetic factors (34,35). The insufficient growth of the mandibular ramus is usually associated with a reduced posterior facial height, divergent growth pattern, and skeletal class II relationship (36,37), whereas significant condylar and ramus growth could prevent backward rotation of the mandible (38).…”

Section: Discussionmentioning

confidence: 99%

Craniofacial and upper airway morphological characteristics associated with the presence and severity of obstructive sleep apnea in Chinese children

Wang

et al. 2023

Front. Pediatr.

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ObjectivesTo identify craniofacial and upper airway morphological characteristics associated with the presence and severity of obstructive sleep apnea (OSA) in children.MethodsThis study consisted of 82 OSA children and 77 controls (age 5–10 years). All subjects underwent cephalograms and were divided into a 5–7 age group and an 8–10 age group. Cephalometric variables were compared between OSA children and controls, and hierarchical regression analysis was performed to examine the relationship between cephalometric variables and OSA severity [expressed by the obstructive apnea–hypopnea index (OAHI)] in different age groups.ResultsIncreased A/N ratio, narrowed posterior airway space, decreased SNA and SNB angles, and shortened ramus height were observed among OSA children in different age groups. In the 5–7 age group, the A/N ratio and a lower gonial angle explained 40.0% and 14.7% of the variance in the OAHI, respectively. In the 8–10 age group, the BMI z-score and A/N ratio explained 25.2% and 6.6% of the variance in the OAHI, followed by a lower gonial angle and the hyoid-retrognathion distance (19.1% in total).ConclusionsAdenoid hypertrophy was a major factor associated with OSA in preschool children, whereas obesity replaced adenoid hypertrophy as the main contributor to OSA in late childhood. Several craniofacial skeletal variables such as the SNB angle, ramus height, lower gonial angle, and hyoid position are also associated with the presence and/or severity of OSA, which could be used to help recognize children at a higher risk for OSA.

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Analysis of Three-Dimensional Morphological Differences in the Mandible between Skeletal Class I and Class II with CBCT Fixed-Point Measurement Method

Cited by 6 publications

References 30 publications

Cranial base measurements in different anteroposterior skeletal relationships using Bjork-Jarabak analysis

Cranial base measurements in different anteroposterior skeletal relationships using Bjork-Jarabak analysis

Bjork-Jarabak Analysis in Different Anteroposterior Skeletal Relationship: A Comparative Study

Craniofacial and upper airway morphological characteristics associated with the presence and severity of obstructive sleep apnea in Chinese children

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