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Revista Dental Press de Ortodontia e Ortopedia Facial

On-line version ISSN 1980-5500

Abstract

NEGREIROS, Paulo Eduardo  and  SIQUEIRA, Vânia Célia Vieira de. The effect of the alteration the natural head position (NHP) on the cephalometric measurements. Rev. Dent. Press Ortodon. Ortop. Facial [online]. 2004, vol.9, n.3, pp.59-76. ISSN 1980-5500.  http://dx.doi.org/10.1590/S1415-54192004000300007.

This work aimed to study the alterations of angular and linear cephalometrics measurements used in cephalometry, when the natural head position (NHP) is modified during the taking of cephalometric radiography, its influence in the orthodontic diagnosis, and the reliability and reproducibility of NHP for successive radiographs. One hundred and eighty cephalometrics radiographs were taken in lateral norm of 30 female patients with age range of 21,3 years old. The X-ray were obtained in two series within 15 days interval among them. In each of the series, the natural head position (NHP), the NHP added of 5 degrees (NHP+5º) and NHP with 5 degrees of flexion (NHP-5º) were registered from each patient. The obtained results demonstrated that the linear measurements S-N, ENA-ENP, Co-Gn, Go-Gn, and the angular measurements SNA, ANB, PP.GoGn, 1.PP, IMPA, 1.1, SN.VER and HF.VER did not present statistically significant alterations among the studied positions and the two series of radiographic taken as well. The angular measurements of SNB, SN.GoGn, FMA, SN.PP, Z Angle, Co-Go presented statistically significant alterations. It was concluded that the angular and linear measurements appraised did not present significant alterations when the NHP modified within of the angular variation strip studied, which did not lead to doubtful diagnosis or interpretations. Due to low variation of the angulations of the SN.VER and HF.VER angles, it was demonstrated that the employment of the Guiding Unit of Positioning presented in this work, allows the reproducibility of the natural head position with great reliability within a + 5º variation strip of NHP.

Keywords : Cefalometry; Orthodontics; Diagnosis; Natural Head Position.

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