OBJECTIVE To evaluate whether patients who had received early class III protraction facemask treatment were less likely to need orthognathic surgery compared with untreated controls. This paper is a 6-year follow-up of a previous clinical trial. DESIGN Multi-centre 2-arm parallel randomized controlled trial. SETTING Eight United Kingdom hospital orthodontic departments. PARTICIPANTS Seven...

BACKGROUND Noninvasive ventilation (NIV) via helmet or total facemask is an option for managing patients with respiratory infections in respiratory failure. However, the risk of nosocomial infection is unknown. METHODS We examined exhaled air dispersion during NIV using a human patient simulator reclined at 45° in a negative pressure room with 12 air changes/h by two different helmets via a v...

OBJECTIVE To investigate the effectiveness of early class III protraction facemask treatment in children under 10 years of age. DESIGN Multicentre, randomized controlled trial. SETTING Eight UK hospital orthodontic units. SUBJECTS AND METHODS Seventy-three patients were randomly allocated, stratified for gender, into an early class III protraction facemask group (PFG) (n = 35) and a contr...

STATEMENT OF THE PROBLEM Achieving a normal soft tissue facial profile is considered to be the main concern of class III patients and the goal of most class III treatments. PURPOSE The purpose of this study was to investigate the effects of facemask treatment on profile with photogrammetric method. MATERIALS AND METHOD Before (T0) and after (T1) treatment photograms of 40 class III patients...

Facemasks and respirators are important components of personal protective equipment for health care workers in hospitals and public civilians during severe hazy conditions or influenza pandemic. The efficacy of protection of facemasks and respirators is of importance as they filter fine airborne particles from reaching the respiratory system and prevent interindividual infection. The protective...

Aim: The aim of this study was to investigate electromyographic (EMG) activities of left and right anterior temporal, masseter, and anterior digastric muscles during resting, maximum voluntary clenching, and swallowing before and after facemask treatment. Materials and Methods: Fifteen patients with Class III malocclusion (mean age, 12.1 6 1.43 years) were included in this study. The patients w...

JCO/APRIL 2003 G patients with dentofacial deformities characterized by either a midfacial deficiency or true mandibular prognathism are perhaps the most challenging cases for the clinician to manage. In patients with midfacial deficiency, the current clinical protocol calls for orthopedic maxillary protraction by means of elastics to either an extraoral facemask or a chin cup.1,2 A maxillary e...

Growing class III patients with maxillary deficiency may be treated with a maxillary protraction facemask. Because the force generated by this appliance is applied to the teeth, the inevitable mesial migration of the dentition can result in anterior crowding, incisor proclination and a possible need for subsequent extraction therapy. The Hybrid Hyrax appliance, anchored on mini-implants in the ...

Wearing masks and face coverings helps reduce transmission of respiratory diseases. Much prior research on mask filtration efficiency has focused fabric type, with less consideration given to design shape. Here, we present evidence that increasing the mouth-mask separation distance engenders an increase in mask-fabric toward expiratory aerosols emitted via vocalization, which attribute a decrea...