Lower Incisor Inclination in Relation to Head Posture, Tongue and Hyoid Positions

Yıl 2019, Cilt: 22 Sayı: 3, 310 - 317, 09.09.2019

Seden Akan Defne Keçik

https://doi.org/10.7126/cumudj.553220

Öz

Objectives: To investigate the relationship between head posture, hyoid bone, tongue position and lower incisor inclination.

Materials and Methods: The study sample consisted of 98 subjects (35 males, 63 females), who had a mean age of 17.7 years in the permanent dentition and with a skeletal Class I relationship. Lower incisor inclination, craniovertical, craniocervical and craniohorizontal postural variables, tongue and hyoid position and airway measurements were evaluated on lateral cephalograms taken in natural head position. The study sample was divided into two groups according to lower incisor inclination (48 had IMPA<90 ⁰ with a mean degree of 88.09 and 50 had IMPA>90 ⁰ with a mean degree of 102.84) and a Student-t test was performed to compare and describe head posture, tongue and hyoid bone positions.

Results: The subjects with upright incisors had a more posteriorly positioned hyoid bone relative to the mandibular symphysis compared with the subjects with flared incisors (p<0.05). Tongue length was greater in the flared incisor group than in the upright incisor group (p<0.05). In relation to head posture measurements, the upright incisor group had 3-3.5° larger cranio-cervical angles (NSL-OPT, NSL-CVT, NL-OPT, NL-CVT angles, p<0.05) than the flared incisor group. The airway measurements revealed no statistically significant difference between the groups.

Conclusions: The position of the hyoid bone, tongue length and craniocervical head posture showed significant differences between upright and flared lower incisors.

Anahtar Kelimeler

incisor, tongue posture, hyoid bone

Kaynakça

• 1. Knosel M, Jung K. On the relevance of "ideal" occlusion concepts for incisor inclination target definition. Am J Orthod Dentofacial Orthop 2011;140:652-659.
• 2. Hernandez-Sayago E, Espinar-Escalona E, Barrera-Mora JM, Ruiz-Navarro MB, Llamas-Carreras JM, Solano-Reina E. Lower incisor position in different malocclusions and facial patterns. Med Oral Patol Oral Cir Bucal 2013;18:43-50.
• 3. Solow B, Tallgren A. Head position and craniofacial morphology. Mondo Ortod 1978;19:75-99. 4. Marcotte MR. Head posture and dentofacial proportions. Angle Orthod 1981;51:208-213.
• 5. Solow B, Sonnesen L. Head posture and malocclusions. Eur J Orthod 1998;20:685-693.
• 6. Rocabado M, Johnston BE Jr, Blakney MG. Physical therapy and dentistry: an overview. J Craniomandibular Pract 1983;1:46-49.
• 7. Pachi F, Turla R, Checchi AP. Head posture and lower arch dental crowding. Angle Orthod 2009;79:873-879.
• 8. Linder-Aronson S. Adenoids. Their effect on mode of breathing and nasal airflow and their relationship to characteristics of the facial skeleton and the denition. A biometric, rhino-manometric and cephalometro-radiographic study on children with and without adenoids. Acta Otolaryngol Suppl 1970;265:1-132.
• 9. Woodside DG, Linder-Aronson S, Stubbs DO. Relationship between mandibular incisor crowding and nasal mucosal swelling. Suom Hammaslaak Toim 1991;87:127-138.
• 10. Marşan G, Oztaş E, Cura N, Kuvat SV, Emekli U. Changes in head posture and hyoid bone position in Turkish Class III patients after mandibular setback surgery. J Craniomaxillofac Surg 2010;38:113-121.
• 11. Valenzuela Z, Miralles R, Ravera M. Does head posture have a significant effect on the hyoid bone position and sternocleidomastoid electromyographic activity in young adults? J Craniom and Pract 2005;23: 204-211.
• 12. Adamidis IP, Spyropoulos MN. Hyoid bone position and orientation in Class I and Class III malocclusions. Am J Orthod Dentofacial Orthop 1992;101:308-312.
• 13. Verma SK, Tandon P, Agrawal DK, Prabhat KC. A cephalometric evaluation of tongue from the rest position to centric occlusion in the subjects with class II division 1 malocclusion and class I normal occlusion. J Orthod Sci 2012;1:34-39.
• 14. Peat JH. A cephalometric study of tongue position. Am J Orthod 1968;54:339-351.
• 15. Milne IM, Cleall JF. Cinefluorographic study of functional adaptation of the oropharyngeal structures. Angle Orthod 1970;40:267-283.
• 16. Gutermann C, Peltomaki T, Markic G, Hänggi M, Schätzle M, Signorelli L, Patcas R. The inclination of mandibular incisors revisited. Angle Orthod 2014;84:109-119.
• 17. Germec-Cakan D, Taner T, Akan S. Uvulo-glossopharyngeal dimensions in non-extraction, extraction with minimum anchorage, and extraction with maximum anchorage. Eur J Orthod 2011;33:515-520.
• 18. Weinstein S, Haack DC, Morris LY, Snyder BB, Attaway HE. On an Equilibrium Theory of Tooth Position. Angle Orthod 1963;33:1-26.
• 19. Proffit WR. Equilibrium theory revisited: factors influencing position of the teeth. Angle Orthod 1978;48:175-186.
• 20. Opdebeeck H, Bell WH, Eisenfeld J, Mishelevich D. Comparative study between the SFS and LFS rotation as a possible morphogenic mechanism. Am J Orthod 1978;74:509-521.
• 21. Adamidis IP, Spyropoulos MN. The effects of lymphadenoid hypertrophy on the position of the tongue, the mandible and the hyoid bone. Eur J Orthod 1983;5:287-294.
• 22. Amayeri M, Saleh F, Saleh M. The position of hyoid bone in different facial patterns: A lateral cephalometric study. Eur Sci J 2014;10:19-34.
• 23. Jena AK, Duggal R. Hyoid bone position in subjects with different vertical jaw dysplasias. Angle Orthod 2011;81:81-85.
• 24. Ferraz MJ, Nouer DF, Teixeira JR, Bérzin F. Cephalometric assessment of the hyoid bone position in oral breathing children. Braz J Otorhinolaryngol 2007;73:45-50.
• 25. Weber P, Corrêa ECR, Bolzan PG, Ferreira FS, Soares JC, da Silva AMT. Relationship between craniocervical posture, mandible and hyoid bone and influence on alimentary functions. Braz J Oral Sci 2012;11:141-147.
• 26. Lowe AA, Takada K, Yamagata Y, Sakuda M. Dentoskeletal and tongue soft-tissue correlates: a cephalometric analysis of rest position. Am J Orthod 1985;88:333-341.
• 27. Bandy HE, Hunter WS. Tongue volume and the mandibular dentition. Am J Orthod 1969;56:134-142.
• 28. Solow B, Kreiborg S. Soft-tissue stretching: a possible control factor in craniofacial morphogenesis. Scand J Dent Res 1977;85:505-507.
• 29. Hellsing E, L'Estrange P. Changes in lip pressure following extension and flexion of the head and at changed mode of breathing. Am J Orthod Dentofacial Orthop 1987;91:286-294.
• 30. Archer SY, Vig PS. Effects of head position on intraoral pressures in Class I and Class II adults. Am J Orthod 1985;87:311-318.