نتایج جستجو برای: hyrax
تعداد نتایج: 233 فیلتر نتایج به سال:
BACKGROUND The Hyrax rapid palatal expander is useful for patients in mixed dentition with premature exfoliation of some deciduous teeth and maxillary hypoplasia. This appliance, which is provided of a vestibular arm for correcting maxillary asymmetric transverse discrepancies, represents an interceptive treatment able to reduce the duration of the orthodontic therapy with fixed appliances. C...
Rapid palatal expansion (RPE) causes separation of the lateral halves of the palate and traditionally has used four maxillary teeth as anchorage. The purpose of this study was to introduce a rapid palatal expander that requires only two anchor teeth (two-point RPEe) and to compare the expansion obtained with that from a Hyrax appliance. This study involved two groups of 25 children aged 7 to 15...
This study aimed to assess the effects of bone-borne and tooth-borne surgically assisted rapid maxillary expansion on the volumes of the nose and nasal airway 2 yr after maxillary expansion. This prospective cohort study included 32 patients with transverse maxillary hypoplasia. Expansion was performed with a tooth-borne distractor (Hyrax) in 19 patients and with a bone-borne distractor [transp...
Taxonomic notes: While as many as 17 subspecies have been described across its range by Hoeck and Bloomer (2013), only one (P. c. capensis), is recognised from the assessment region (Meester et al. 1986). However, Prinsloo and Robinson (1992) discovered a genetic break between the north-western and south-central populations in South Africa, indicating a possible species complex. Similarly, Viss...
We present a zero-knowledge argument for NP withlow communication complexity, low concrete cost for both theprover and the verifier, and no trusted setup, based on standardcryptographic assumptions (DDH). Specifically, communicationis proportional to at most the square root of the witness size, plusd ·log(G), for d the depth andG the width of the verifying circuit.Moreov...
PURPOSE The aim of this study was to investigate the initial effects of maxillary expansion therapy with Hyrax appliance and to evaluate the related changes in maxillary sinus volume. MATERIALS AND METHODS Thirty patients (20 females, 10 males; 13.8 years) requiring maxillary expansion therapy, as part of their comprehensive orthodontic treatment, were examined. Each patient had cone-beam com...
background: the aim of this study was to compare the skeletal and dental changes of a toothborne (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 smil...
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