BACKGROUND The aim of this study was to compare the skeletal and dental changes of a tooth-borne (Hyrax) and a bone-borne (Smile distractor) expansion devices using three-dimensional model of a human skull. MATERIALS AND METHODS A finite element model of human skull was generated using data from 3-D CT scans of an 11-year-old female child. Then a Hyrax expander (tooth-borne appliance) and Smi...

BACKGROUND In this finite element (FE) study, the stress distribution and displacement pattern was evaluated in the mid-palatal area and around circum-maxillary sutures exerted by bone-borne palatal expander (BBPE) in comparison with conventional HYRAX rapid palatal expander in unilateral cleft lip and palate. METHODS Computed tomography scan images of a patient with unilateral cleft palate w...

The demographics of syntopic populations of Procavia capensis (rock hyrax) and Heterohyrax brucei (yellowspotted hyrax) were studied during a drought from October 1991 to May 1992 in the Matobo National Park (MNP), Zimbabwe. Pups comprised >27% of the samples after a synchronous March April 1992 birth event in which about 50% of the adult females participated. The timing and frequency of partur...

AIMS AND OBJECTIVES The purpose of the study was to assess the skeletal and dental effects of fan-type rapid maxillary expansion (RME) appliance and Hyrax RME appliance on the craniofacial structures. MATERIALS AND METHODS The sample of the study included 12 patients with constricted maxillary arches. Acrylic bonded type of attachment was used for both groups. Changes in sagittal, vertical, a...

BACKGROUND The aim of this in vitro study was the evaluation of the mechanical properties the screws for rapid maxillary expansion (RME). METHODS Three commercially available screws for RME were tested: Leone A2620; Dentaurum Hyrax; Forestadent Palatal Split Screw. All expansion screws were 10 mm in size. For the evaluation of mechanical properties, the screws for RME were adjusted using the ...

The rock hyrax has been shown to have a very unusual and complex digestive tract. The gastrointestinal tract is comparable to that of the simple and complex stomach of mammals as well as to that of birds. Determinations of osmolality and electrolytes have been made in different sections of the gut of the hyrax. However, with the exception of the elevated potassium levels observed in the cranial...

This case illustrates orthopaedic treatment of a 12.1-year-old girl with class III malocclusion and maxillary deficiency. The patient was treated by a fixed tongue appliance in the upper jaw. First maxillary molars and premolars were banded and a hyrax was mounted on them in order to achieve lateral expansion. A fixed tongue appliance comprising of a few cribs was soldered to the anterior side ...

Context. Objective assessments of habitat requirements for endangered species are often lacking when planning management strategies, and inappropriate landscape manipulation can sometimes turn an endangered species into a pest. Recent expansive population growth of the rock hyrax Procavia capensis in northern Israel has been attributed largely to the proliferation of man-made boulder piles on t...