Abstract
Introduction: Human dental arch acquires stable form and dimensions with the attainment of adulthood. The orthodontic treatment regimen signifies the predetermination of the shape and type of dental arch form of a particular adult population to harmonize with their natural pattern. The use of predetermined arch form helps in diagnosis, treatment planning and stability of orthodontic treatment results. Objective: To analyze the dental arch forms of Nepalese adults and to classify them into morphological types. Materials & Method: Predetermined transverse and sagittal dimensions on dental stone models of one hundred Nepalese adults aged 17-32 years with normal occlusion and dentofacial proportion were measured using standardized Boley gauze. The analysis was done according to Raberin’s mathematical sixth degree polynomial method. The study compared the gender difference among the Nepalese samples. Result: The distribution of the Nepalese arch form types were; 26% flat arch, 24% wide arch, 19% pointed arch, 18% narrow arch and 13% mid arch. Conclusion: Considerable variation in distribution of dental arch form types found between Nepalese male and female samples and among population groups. The analysis enables the mathematical method that predetermines the dental arch form of the individual orthodontic patient.DOI: http://dx.doi.org/10.3126/ojn.v3i1.9267 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 7-13
Highlights
Human dental arch acquires stable form and dimensions with the attainment of adulthood
The analysis enables the mathematical method that predetermines the dental arch form of the individual orthodontic patient
The present study aims to determine dental arch form of the Nepalese adults and establish norms that could be applied to the orthodontic diagnosis and treatment planning of the Nepalese orthodontic patients
Summary
Human dental arch acquires stable form and dimensions with the attainment of adulthood. The orthodontic treatment regimen signifies the predetermination of the shape and type of dental arch form of a particular adult population to harmonize with their natural pattern. Human dental arch forms have been described using simple qualitative descriptions as well as complex mathematical methods. Broombell[3] in 1902 stated that the teeth are arranged in the jaws in the form of parabolic curves. Angle[4] in 1907 recognized dental arch as parabolic but he stated that arch form varied greatly with race and type of the individual. Lasher[5] in 1934 noted similarity between the dental arch form and natural arch formations. He compared dental arch with architectural design; the voussoir arch
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