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Australasian Orthodontic Journal
Australian Society of Orthodontists
Subject: Dentistry, Orthodontics & Medicine
ISSN: 2207-7472
eISSN: 2207-7480
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Developmental stage specific ANB reference values based on a longitudinal sample of untreated Caucasian subjects
Margaret Hostage / Mathew T. Silver / Stephanie C. Finn / Benjamin Canary / Alpdogan Kantarci / Veerasathpurush Allareddy / Negin Katebi / Mohamed I. Masoud *
Citation Information : Australasian Orthodontic Journal. Volume 36, Issue 1, Pages 69-74, DOI: https://doi.org/10.21307/aoj-2020-009
License : (CC BY 4.0)
Published Online: 20-July-2021
- ARTICLE
- FIGURES & TABLES
- REFERENCES
- EXTRA FILES
- COMMENTS
ARTICLE
ABSTRACT
Objectives: The study aimed to assess the longitudinal changes in the ANB angle before and after adolescence, and determine Class I normative values for childhood and adolescent Caucasian patients based on cervical vertebral maturation stages (CVMS) and gender.
Setting and sample population: The sample included 71 (41 females and 30 males) untreated Caucasian subjects who took part in a growth study between 1959 and 1976.
Materials and methods: Lateral cephalometric radiographs were analysed at CVMS1 (childhood) and again at CVMS4-5 (adulthood). A paired sample t-test was used to analyse ANB angle differences between the two time points. Subjects who were skeletally and dentally Class I at adulthood (51 subjects) had their radiographs at CVMS1 (childhood) and CVMS2-3 (adolescence) used to establish Caucasian normative values for those stages. Data were also analysed for gender and skeletal classification differences.
Results: There was a statistically significant decrease in ANB value (2.3°) from CVMS1 to CVMS4-5 in the combined sample as well as the skeletal Class I and Class III groups (2.5° and 3.3° for Class I and Class III subjects, respectively). The reduction was smaller and not statistically significant in Class II individuals (1.5°). In Class I individuals, ANB values were 4.68° (SD:1.76°) at CVMS1, 2.86° (SD:1.18°) at CVMS2-3, and 2.13° (SD:0.99°) at CVMS4-5. No significant gender differences were found.
Conclusions: Statistically significant decreases in the ANB angle can be expected between childhood and adulthood in Class I and Class III patients but not Class II untreated subjects. Adult normative values should not be used for children.
FIGURES & TABLES
REFERENCES
1. Downs WB. The role of cephalometrics in orthodontic case analysis and diagnosis. Am J Orthod 1952;38:162-82.
2. Steiner CC. Cephalometrics for you and me. Am J Orthod 1953;39:729-55.
3. Tweed CH. The frankfort-mandibular incisor angle (FMIA) in orthodontic diagnosis, treatment planning, and prognosis. Angle Orthod 1954;24:121-69.
4. Riedel RA. The relation of maxillary structures to cranium in malocclusion and in normal occlusion. Angle Orthod 1952;22:142- 5.
5. Baccetti T, Franchi L, McNamara JA Jr. An improved version of the cervical vertebral maturation (CVM) method for the assessment of mandibular growth. Angle Orthod 2002;72:316-23.
6. Casko JS, Shepherd WB. Dental and skeletal variation within range of normal. Angle Orthod 1984;54:5-17.
7. Proffit WR, Fields HW, Sarver DM. Contemporary Orthodontics. St. Louis, Mo.: Mosby Elsevier, 2007.
8. Lux CJ, Burden D, Conradt C, Komposch G. Age-related changes in sagittal relationship between the maxilla and mandible. Eur J Orthod 2005;27:568-78.
9. Huang WJ, Taylor RW, Dasanayake AP. Determining cephalometric norms for Caucasian and African Americans in Birmingham. Angle Orthod 1998;68:503-11.