Extrait

Background and study aims The management of worn upper and/or lower anterior (front) teeth is a challenge, as the teeth often become much shorter in length. This affects the appearance and function, and there is no space to add to or build up the individual teeth to their original size without opening up the bite at the back of the mouth (posterior teeth). In 1975, Dahl described a planned approach whereby the anterior worn teeth were built up, regardless of the fact that this produced a gap between the posterior teeth. It was observed that over a few months the back teeth would then grow back into contact with their opposing teeth to re-establish the bite around the whole mouth. This is because teeth, if they are not in contact, tend to continue to move (erupt) until they contact an opposing tooth. There has been no work to analyse the changes that occur between the quality of the original posterior contacts and the new ones produced after the Dahl approach has been used. Some recent studies have reported on whether contacts are re-established completely or partially but with no reference to the ideal occlusion, as described in standard textbooks. The aim of this study is to investigate the quality of biting contacts after a specific restorative technique has been applied for the treatment of worn teeth, through analyses of dental casts/models of the upper and lower teeth to identify the contacts between them before and after treatment and to compare them to the ideal occlusion. Who can participate? Adult patients (male or female, age 18+) treated at the Leeds Dental Institute, who have received direct composite restorations as a fixed Dahl appliance for the treatment of worn anterior upper and/or lower teeth. What does the study involve? The subjects recruited will be asked to attend one short research appointment (30 minutes) at the Leeds Dental Institute between November 2012 and February 2013 to have an upper and a lower jaw alginate impression taken, and will be discharged afterwards. Casts will be produced from these impressions and they will be digitally scanned and compared through a computer program to the existing casts taken from the same patient prior to the suggested treatment. The computer program will show the biting relationship before and after the treatment. This data will be compared to assess if the biting contacts remain the same as previously to the treatment, or if they rearrange in a better/worse functional position. What are the possible benefits and risks of participating? There will be no direct benefits to the participants other than the knowledge that their involvement may allow a deeper understanding of their own condition. There are no known risks to the participants in addition to those associated with a routine dental impression of the upper and lower jaws. Where is the study run from? The Leeds Dental Institute at the University of Leeds (UK). When is the study starting and how long is it expected to run for? Recruitment and data collection will run from November 2012 until February 2013. Who is funding the study? University of Leeds (UK). Who is the main contact? Gabriel Simon [email protected]

Critère d'inclusion

• Occlusion

Liens

• ictrp
• isrctn