Extrait

Background and study aims The study is about dental occlusion (contact between teeth) and the aim is to investigate the accuracy of a new, non-invasive ‘optical’ technique to measure the horizontal axis of the jaw (the axis the jaw rotates around, when a subject closes their mouth). This axis needs to be recorded for many dental procedures. Current (mechanical) methods are invasive, time consuming and inaccurate. A simple, accurate method would raise the standard of care through improved diagnosis, treatment planning and better fitting dental prostheses. Who can participate? Adult health professionals recruited via posters, group emails and announcements at the end of relevant lectures. This research is part of a PhD. What does the study involve? Subjects will undergo a dental examination to exclude disease. Traditional impressions will then be taken of the upper and lower teeth. These will be cast in dental stone then digitised, to create ‘virtual’ dental models. Two cameras will photograph the subjects’ front teeth. The teeth will be illuminated with a pattern projected from a digital projector (rather than a camera flash). This combination enables accurate 3D photographs to be calculated. 3D photographs are taken at two differing degrees of jaw opening (one with the teeth almost touching, and one with a 10mm gape). The axis of jaw rotation can be calculated using these photographs, and the virtual models. The accuracy of this axis will be investigated using two methods. Firstly, a 3D photograph is taken at an ‘intermediate’ jaw gape (5mm). The virtual models are rotated around the previously calculated axis, to produce an identical gape (5mm). The position of the virtual models is compared to the measured position. Secondly, the ‘intermediate’ jaw position is physically recorded, using dental bite registration paste (a fast-setting silicone paste, syringed between the teeth). This paste is removed, 3D-scanned and used to align the virtual models. This position is compared to the previously calculated position. What are the possible benefits and risks of participating? Not provided at time of registration Where is the study run from? University of Leeds, UK When is the study starting and how long is it expected to run for? December 2014 to January 2015 Who is funding the study? 1. Faculty of Medicine and Health, University of Leeds UK 2. The research is funded by the University of Leeds, as part of a PhD. Who is the main contact? Andrew Keeling [email protected]

Critère d'inclusion

• Dental occlusion

Liens

• isrctn
• ictrp