BACKGROUND A common but debated technique in the management of swallowing difficulties is the chin tuck swallow, where the neck is flexed forward prior to swallowing. Natural variations in chin tuck angles across individuals may contribute to the differential effectiveness of the technique. METHODOLOGY To facilitate the study of chin tuck angle variations, we present a template tracking algor...

PURPOSE This study examined the effects of chin-down swallowing on laryngeal vestibule closure. It also investigated the technique's rehabilitative impact, by assessing the stability of effects across multiple trials and aftereffects in neutral swallows on cessation of the technique. METHOD Duration of laryngeal vestibule closure (dLVC) was measured with videofluoroscopy in 16 healthy partici...

BACKGROUND The chin shape and position is important in determining the general shape of the face, and augmentation genioplasty is performed alone or in combination with other aesthetic procedures. However, augmentation genioplasty using osteotomy is an invasive and complex procedure with the potential to damage mentalis muscle and mental nerve, to affect chin growth, and prolonged recovery. Our...

BACKGROUND A validated scale is needed for objective and reproducible comparisons of chin appearance before and after chin augmentation in practice and clinical studies. OBJECTIVE To describe the development and validation of the 5-point photonumeric Allergan Chin Retrusion Scale. METHODS The Allergan Chin Retrusion Scale was developed to include an assessment guide, verbal descriptors, mor...

OBJECTIVE In this study, we aimed to examine the relationship between chin deviation and the positional and morphological features of the mandible and to determine the factors that contributed to chin deviation in individuals with a unilateral cleft lip and palate (UCLP). METHODS Cone-beam computed tomography (CBCT) images of 28 adults with UCLP were analyzed in this study. Segmented three-di...

PURPOSE This study investigated the effect of the chin-down posture on the sequence of swallowing events in healthy adults. METHOD Sixteen healthy participants performed 45 5-ml thin liquid swallows during videofluoroscopy: 5 neutral head position, 30 chin-down posture, and then 10 neutral head position. Eight swallowing events were measured: the time of hyoid burst, bolus head in the pharynx...

In this paper, an improved method to extract the chin contour under different face poses is proposed. Several previous approaches have used active contour models(ACM) or snakes in front-view facial images. However, successful chin contour extraction for a wide range of face poses has seldom been mentioned. An algorithm based on an improved snake for chin contour extraction is presented here and...