A simple method for taking natural-head-position cephalograms

Head Strap Double Fluid Level Device: An Innovative and User Friendly Design to Record Natural Head Position (NHP)

“…Facial analysis based on the philosophy of 'Facial Keys' underscores the importance of NHP [5]. The preference for NHP stems from its reliability that has been studied and proved by various authors [4,6]. NHP is more reliable than commonly used intracranial reference planes.…”

“…Several methods have been proposed to record NHP. The most accurate method was the fluid level device by Showfety et al, [4]. The fluid level device relies on a double sided adhesive tape for attachment onto the patient's temple.…”

“…The fluid level device was introduced to the profession by Showfety et al, [4]. It works on the principle that in a non-accelerating fluid system the surface of the liquid is horizontal.…”

Evaluation of Head Position in Static and Dynamic Three-Dimensional Imaging: a review of the Literature

“…It has since become an important concept for head orientation in orthognathic treatment procedures. Studies show a remarkable reproducibility of NHP in two dimensions [5][6][7]. The registration of NHP has previously been carried out in standing or sitting subjects, through estimated NHP, and in combinations.…”

Estudo comparativo entre avaliações esqueléticas e do perfil tegumentar utilizadas no diagnóstico ortodôntico sagital

“…Pequenas correções de planos cefalométricos são sugeridas na literatura, intencionando-se aproximar os resultados dentoesqueléticos aos faciais ou à realidade clínica do paciente 4,15,20 . Alguns autores sugeriram a utilização de um plano de referência extra-craniano que traduzisse a posição natural da cabeça, cuja reprodutibilidade foi testada 8,21,[28][29][30] .…”