Occlusion Oral Health
Conditions
Interventions
The procedure for comparing occlusal relationships before and after the treatment of worn mandibular anterior dentition with direct composite restorations as a fixed ?Dahl? type appliance
1. Preparat
Sponsors
University of Leeds (UK)
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. 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 dentition in the last year. 2. Be able to attend a 30 minutes appointment 3. Be competent to freely give positive consent for participation 4. Does not have an allergy to alginate
Exclusion criteria
Exclusion criteria: 1. Patients with incomplete development of adult dentition 2. Patients with less than 2 pairs of posterior occluding teeth in each half arch (e.g. two upper premolars occluding on two lower premolars on the left hand side of the jaws and two upper premolars occluding on one lower premolar and one lower molar on the right hand side of the jaws) 3. Patients who have not completed at least 6 months of treatment by this research's "data collection" stage (at the moment stipulated to Nov/2012-Feb/2013). 4. Patients where upper and lower pre-operative study models, taken prior to the execution of the treatment are not available 5. Patients that for any reason can't attend appointments, or can't have upper and lower alginate impressions taken 6. Known sensitivity to alginate
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The difference in the distribution of biting contacts, and near contacts, between the upper and lower pre-operative and post-operative dental casts. Method to achieve the primary outcome: 1. The dental casts (before and after treatment), for each patient, will be hand articulated into biting position and mounted in a simple hinge articulator; 2. An silicon impression material will be used to create a record of the bite relationship; 3. Dental casts and bite records will be scanned from multiple views using a high precision optical scanner; 4. Through the use of a special computer program (PolyWorks InnovMetric Software) 3D virtual models will be created for the dental casts and bite records; 5. Virtual models will be analysed through a computer program (Virtual Dental Patient Minnesota Dental Research Center for Biomaterials and Biomechanics under NIH/NIDCR grant RO1 DE12225); 6. The upper and lower virtual casts will be aligned in biting position using the virtual bite record; Virtual biting contacts will be calculated for the articulated virtual casts (virtual cast contacts) using the Virtual Dental Patient computer program (virtual contacts are regions on opposing virtual surfaces that are within 0.350mm of each other). | — |
Secondary
| Measure | Time frame |
|---|---|
| No secondary outcome measures | — |
Countries
United Kingdom
Outcome results
None listed