The purpose of this study was to develop and test a new technique for recording natural head position (NHP) in 3 dimensions and transferring it into a three-dimensional computed tomography (CT) model. In this technique, a digital gyroscope was first attached to a human head using a bite-jig and a face-bow with a set of built-in fiducial markers. The relationship between the gyroscope and fiduci...

PURPOSE Tumor infiltrating lymphocytes are playing an important role in cutaneous melanoma being a strong prognostic parameter. Our goal was to study the presence of high endothelial vessels in correlation with the histopathological features in different pigmented skin lesions. MATERIAL AND METHODS our study group included 60 patients (20 cases with dysplastic nevi, 20 thin melanoma and 20 th...

UNLABELLED The aim of this study was to develop an automatic orientation calibration and reproduction method for recording the natural head position (NHP) in stereo-photogrammetry (SP). A board was used as the physical reference carrier for true verticals and NHP alignment mirror orientation. Orientation axes were detected and saved from the digital mesh model of the board. They were used for c...

This study aimed to evaluate whether there is an association between facial morphology on cephalometrics and surface electromyographic (sEMG) recordings of the head, neck, and trunk muscles. Forty-seven Caucasian adult females, 18-29years of age (average: 24), underwent lateral skull radiographs in "natural head position", obtained by having the subject look at a small mirror at eye level, and ...

What is head stabilization in birds? When the body of a bird is held in the hand and rotated or moved in different directions the head often appears ‘locked in space’ or glued to the spot, and does not move with the rest of the body. To maintain this stable position the bird has, of course, to make complex compensatory movements of the neck. This can be seen clearly in chickens, pigeons, owls a...

The purpose of this study was to develop a technique to record physical references and orient digital mesh models to a natural head position using stereophotogrammetry (SP). The first step was to record the digital mesh model of a hanging reference board placed at the capturing position of the SP machine. The board was aligned to true vertical using a plumb bob. It also was aligned with a laser...

OBJECTIVE The aim of this study was to investigate the reproducibility of natural head position (NHP) at different times of the day and to compare the reproducibility of the initial photographs with 6-month repeat photographs. MATERIALS AND METHODS The participants in this prospective study were seventy 14 to 50-year-old individuals. Each participant was photographed with a digital camera twi...

Participants in conversations have a wide range of verbal and nonverbal expressions at their disposal to signal their intention to occupy the speaker role. This paper addresses two main questions: (1) How do dialogue participants signal their intention to have the next turn, and (2) What aspects of a participant’s behaviour are perceived as signals to determine who should be the next speaker? O...

Many animals inhabit environments where they experience temperature fluctuations. One way in which animals can adjust to these temperature changes is through behavioral thermoregulation. However, we know little about the thermal benefits of postural changes and the costs they may incur. In this study, we examined the thermoregulatory role of two postures, the head-tuck and leg-tuck posture, in ...

Since posture is of great importance in pernosal health & social life,so evaluation of prevalence of  foreward head posture in school children of adolesent age seems necessary for proper prevention planning and treatment.the present study is an analytic-descriptive on 480 students(240 girls and 240 boys) from Shiraz high school in 1999.the subjects were selected according to clusture random sa...