The Comparison of Symphysis Morphology in Normodivergent Patients of Short and Normal Mandible
Comparison of Symphysis Morphology
Keywords:
Symphysis, morphy, orthodontics, mandibleAbstract
Objective: To compare the morphological symphysis in normodivergent patients of short and normal mandible
attending outpatient department of large public sector dental hospital of Karachi, Pakistan.
Methods: This was a prospective observational study that was carried out at the outpatient department of the orthodontics, Sindh Institute of Oral Health Sciences, from June-2020 to December-2020. The study included 70 (35 in each group) patients with a normal angle MMA over the range of 25.5° ± 5.3°. McNamara analysis has been carried out including all the patients and dividing into two group's i.e., normal mandible and short mandible. On cephalogram, perpendicular distance from Pog to B-Me line, angle symphysis vertical dimension (B-B1-Gn), and angle symphysis convexity (B-Pog-Me), were measured for all patients.
Results: Of 70 patients, there were 24 (34.3%) males and 46 (65.7) females. Patients were equally divided into two groups, i.e., short 35 (50.0%) and normal mandible 35 (50.0%). The mean angle of symphysis convexity, symphysis vertical dimension, and anterior prominence of symphysis of participants were 124.6 ± 42.8, 49.9 ± 4.7, and 4.1 ± 1.1 respectively. Patients of short mandibular were found significantly higher in symphysis convexity as compared to patients of normal mandibular, i.e., 136.54 ± 3.55 and 112.74 ± 58.53 respectively, (p- value= 0.022).
Conclusion: Symphysis convexity was found greater in short mandible patients showing that in short mandible
patients, symphysis was flatter anteriorly, less convex, and less prominent.
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References
2. Hoenig JF. Sliding osteotomy genioplasty for facial aesthetic balance: 10 years of experience. Aesthetic Plast Surg 2007; 31:384-91. doi: 10.1007/s00266-006-0177-6
3. Gupta S, Dhingra PS, Chatha S. A study of comparison and correlation between antegonial notch depth, symphysis morphology, and ramus morphology among different growth patterns in angle's Class II Division 1 Malocclusion. Indian J Dent Sci 2018; 10:21. doi: 10.4103/IJDS.IJDS_109_17
4. Slutzkey S, Levin L. Gingival recession in young adults: occurrence, severity, and relationship to past orthodontic treatment and oral piercing. Am J Orthod Dentofacial Orthop 2008; 134:652-6. doi.org/10.1016/j.ajodo.2007.02.054
5. Sugito H, Shibukawa Y, Kinumatsu T, Yasuda T, Nagayama M, Yamada S, et al. Ihh signaling regulates mandibular symphysis development and growth. J Dent Res 2011; 90:625-31. doi.org/10.1177/0022034510397836
6. Ravosa MJ, Vinyard CJ. Masticatory loading and ossification of the mandibular symphysis during anthropoid origins. Sci Rep 2020; 10:1-9. doi.org/10.1038/s41598-020-62025-8
7. Yamada C, Kitai N, Kakimoto N, Murakami S, Furukawa S, Takada K. Spatial relationships between the mandibular central incisor and associated alveolar bone in adults with mandibular prognathism. Angle Orthod 2007; 77:766-72. doi.org/10.2319/072906-309
8. Esenlik E, Sabuncuoglu FA. Alveolar and symphysis regions of patients with skeletal classII division 1 anomalies with different vertical growth patterns. Eur J Dent 2012; 6:123-32.
9. Syed ST, Mahmood A, Nazir R. Comparison of symphysis morphology in normodivergent patients of the short and normal mandible. Pak Orthod J 2017; 9:87-92.
10. Shioya S, Arai K. Dentoskeletal morphology of adult Class II division 1 and 2 severe deep overbite malocclusions. Orthod Waves 2017; 76:97-104. doi.org/10.1016/j.odw.2017.01.003
11. Ahn MS, Shin SM, Yamaguchi T, Maki K, Wu T-J, Ko C-C, et al. Relationship between the maxillofacial skeletal pattern and the morphology of the mandibular symphysis: Structural equation modeling. Korean J Orthod 2019; 49:170-80. doi.org/10.4041/kjod.2019.49.3.170
12. Linjawi AI, Afify AR, Baeshen HA, Birkhed D, Zawawi KH. Mandibular symphysis dimensions in different sagittal and vertical skeletal relationships. Saudi J Biol Sci 2021; 28:280-5. doi.org/10.1016/j.sjbs.2020.09.062
13. Janson G, Goizueta OEFM, Garib DG, Janson M. Relationship between maxillary and mandibular base lengths and dental crowding in patients with complete Class II malocclusions. Angle Orthod 2011; 81:217-21. doi.org/10.2319/062110-338.1
14. Pintavirooj P, Sumetcherngpratya R, Chaiwat A, Changsiripun C. Relationship between mentalis muscle hyperactivity and mandibular symphysis morphology in skeletal Class I and II patients. Orthod Waves 2014; 73:130-5. doi.org/10.1016/j.odw.2014.09.006
15. Uzuner FD, Aslan BI, Dinçer M. Dentoskeletal morphology in adults with Class I, Class II Division 1, or Class II Division 2 malocclusion with an increased overbite. Am J Orthod Dentofacial Orthop 2019; 156:248-56. e2.
doi.org/10.1016/j.ajodo.2019.03.006
16. Chung CJ, Jung S, Baik H-S. Morphological characteristics of the symphyseal region in adult skeletal Class III crossbite and open bite malocclusions. Angle Orthod 2008; 78:38-43. doi.org/10.2319/101606-427.1
17. Mangla R, Singh N, Dua V, Padmanabhan P, Khanna M. Evaluation of mandibular morphology in different facial types. Contemp Clin Dent 2011; 2:200-6. doi: 10.4103/0976-237X.86458
18. Al-Khateeb SN, Al Maaitah EF, Abu Alhaija ES, Badran SA. Mandibular symphysis morphology and dimensions in different anteroposterior jaw relationships. Angle Orthod 2014; 84:304-9. doi.org/10.2319/030513-185.1
19. Tang N, Zhao Z, Liao C, Zhao M. [Morphological characteristics of mandibular symphysis in adult skeletal class II and class III malocclusions with abnormal vertical skeletal patterns]. Hua xi kou Qiang Yi Xue za zhi 2010; 28:395-8.
20. Jain S, Puniyani P, Saifee A. Mandibular symphysis morphology and lower incisor angulation in different anteroposterior jaw relationships and skeletal growth patterns–a cephalometric study. Med Pharm Rep 2020; 93:97-104. doi.org/10.1016/S0889-5406(05)81008-X
21. Knigge RP, Vinyard CJ, McNulty KP. Mandibular symphyseal fusion in fossil primates: Insights from correlated patterns of jaw shape and masticatory function in living primates. Am J Phys Anthropol 2020; 173:322-36. doi.org/10.1002/ajpa.24048
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Copyright (c) 2021 Erum behroz khan, Hunny kumari, Ayesha bibi, Danish ali mottani, Sarvaich kumar
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