EFFECT OF INCISOR INCLINATION CHANGES ON CEPHALOMETRIC POINTS A AND B
Abstract
Background: The position of cephalometric points A and B are liable to be affected by alveolar remodelling caused by orthodontic tooth movement during incisor retraction. This study was conducted to evaluate the change in positions of cephalometric points A and B in sagittal and vertical dimensions due to change in incisor inclinations. Methods: Total sample of 31 subjects were recruited into the study. The inclusion criteria were extraction of premolars in upper and lower arches, completion of growth and orthodontic treatment. The exclusion criteria were patients with craniofacial anomalies and history of orthodontic treatment. By superimposition of pre and post treatment tracings, various linear and angular parameters were measured. Various tests and multiple linear regression analysis were performed to determine changes in outcome variables. Statistically significant p-value was ≤0.05. Results:One-sample t-test showed that change in position of only point A was statistically significant which was 1.61mm (p<0.01) in sagittal direction and 1.49mm (p<0.01) in vertical direction. Multiple linear regression analysis showed that if we retrocline upper incisor by 10o, the point A will move superiorly by 0.6mm.Conclusions: Total change in the position of point A is in a downward and forward direction. Total Change in upper incisors inclinations causes change in position of point A only in vertical direction.Keywords: Incisor inclination, Point A, Point B, cephalometricReferences
Mills JR. The effect of orthodontic treatment on skeletal pattern. Br J Orthod1978;5(3):133–43.
Taylor CM. Changes in the relationship of nasion, point A and point B and the effect on ANB. Am J Orthod 1969;56(2):143–63.
Jacobson A. The Wits appraisal of the jaw disharmony. Am J Orthod 1975;67(2):125–38.
Kim YH, Vietas JJ. Anteroposterior dysplasia indicator: an adjunct to cephalometric differential diagnosis. Am J Orthod 1978;73(6):619–33.
McNamara JA. A method of cephalometric evaluation. Am J Orthod 1984;86(6):449–69.
Nanda RS, Merrill RM. Cephalometric assessment of sagittal relationship between maxilla and mandible. Am J Orthod Dentofacial Orthop 1994;105(4):328–44.
Hall-Scott J. The maxillary-mandibular planes angle (MM degree) bisector (a new reference plane for anteroposterior measurement of dental bases). Am J Orthod Dentofacial Orthop. 1994;105(6):583–91.
Cangialosi TJ, Meistrell ME Jr. A cephalometric evaluation of hard and soft tissue changes during the third stage Begg treatment. Am J Orthod 1982;81(2):124–9.
Knight H. The effects of three methods of orthodontic appliance therapy on some commonly used cephalometric angular variables. Am J Orthod Dentofacial Orthop 1988;93(3):237–44.
Erverdi N. A cephalometric study of changes in point A under the influence of upper incisor inclinations. J Nihon Univ Sch Dent 1991;33(3):160–65.
Al-Abdwani R, Moles DR, Noar JH. Change of incisor inclination effects on points A and B. Angle Orthod 2009;79(3):462–7.
Riolo ML, Moyers RE, McNamara JA Jr, Hunter WS. An Atlas of Craniofacial Growth: Cephalometric Standards from the University School Growth Study. Monograph 2, Craniofacial Growth Series. Ann Arbor, Mich: Center for Human Growth and Development, University of Michigan, Ann Arbor; 1974.
Knight H. The effects of three methods of orthodontic appliance therapy on some commonly used cephalometric angular variables. Am J Orthod Dentofacial Orthop 1988;93(3):237–44.
Macdonald KE, Kapust AJ, Turley PK. Cephalometric changes after the correction of Class III malocclusion with maxillary expansion/facemask therapy. Am J Orthod Dentofacial Orthop 1999;116(1):13–24.
Housten W, Tulley J, Stephans CD. A Textbook of Orthodontics. 2nd ed. Bristol, UK: Wright; 1992;95–116.
Proffit WR. Contemporary Orthodontics. 2nd ed. St Louis, Mo: Mosby Year Book Inc; 1993:33–4, 174–5.
Al-Nimri KS, Hazza’a AM, Al-Omari RM. Maxillary incisor proclination effect on the position of point A in class II division 2 malocclusion. Angle Orthod 2009;79(5):880–4.
Goldin B. Labial root torque: effect on the maxilla and incisor root apex. Am J Orthod Dentofacial Orthop. 1989;95(3):208–19.
Arvysts MG. Nonextraction treatment of severe Class II division 2 malocclusion: part 1. Am J Orthod Dentofacial Orthop 1990;97(6):510–21.
Arvysts MG. Nonextraction treatment of severe Class II division 2 malocclusion: part 2. Am J Orthod Dentofacial Orthop. 1991;99(1):74–84.
Cleall JF, BeGole EA. Diagnosis and treatment of Class II division 2 malocclusion. Angle Orthod 1982;52(1):38–60.
Salzmann JA. The research workshop on cephalometrics. Am J Orthod 1960;46:834–47.
Spady M, Buschang PH, Demirjian A. Mandibular rotation and angular remodeling during childhood and adolescence. Am J Hum Biol 1992;4:683–9.
Wang M, Buschang PH, Behrents R. Mandibular rotation and remodeling changes during early childhood. Angle Orthod. 2009;79(2):271–5.
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