Franks, Sarah Louise (2023). Do patients with facial dsymorphology recognise themselves in profile? University of Birmingham. M.Sc.
|
Franks2023MScbyRes_Redacted.pdf
Text - Redacted Version Available under License All rights reserved. Download (6MB) | Preview |
Abstract
Aims:
The purpose of this investigation was to determine whether pre-operative Class III skeletal patients, who require orthognathic surgical correction, were able to accurately identify the site and extent of their dento-facial dysmorphology. As such determining whether 2D photo-cephalometric planning is a valid form of communication tool. In addition the study questioned patients whether they would prefer to see a three-dimensional reconstruction (rather than a 2D profile view) during orthognathic surgery treatment planning; and if patients would be willing to accept an increased radiation exposure to facilitate seeing themselves in 3D.
Design:
Single center, prospective cross-sectional study.
Materials and methods:
Twenty adults with a Class III dento-facial malocclusion, were recruited from the Birmingham Dental Hospital, United Kingdom. The participants used ‘Computer-Assisted Simulation System for Orthognathic Surgery’ (CASSOS) (SoftEnable Technology Ltd.) software package to manipulate a distorted digital construction of their soft tissue profile; to assess whether they have an accurate perception of their lateral profile. Patients were able to move their upper lip and lower lip/chin backwards and forwards. As well as the lower lip/chin up and down. Differences in linear horizontal distance between the patient-perceived position of the upper lip (Labrale superious) and chin (Pogonion) and the actual position of their upper lip and chin were measured. The subjects also completed a ‘Participant Questionnaire’.
Results:
Intra-patient reproducibility was found to be excellent (intra-class correlation coefficient score 0.93 to 0.98). The mean difference in upper lip position was -2.3 ± 3.0mm (95% CI -3.7mm to -0.9mm) (p=0.001). Mean differences in AP chin position and vertical chin position were 0.8 ± 3.7m (95% CI -0.9mm to 2.5mm) (p=0.334) and 4.7 ± 4.2mm (95% CI 2.7mm to 6.6mm) (p=0.001) respectively. All absolute mean differences were greater than 3.0mm, these differences would be deemed clinically significant.
Conclusions:
In this present study approximately half of patients could not correctly identify their current pre-surgical facial profile. Patients were able to determine their anterior-posterior chin position with greater accuracy than their upper lip position. There was a tendency to produce a retrusive upper lip position, exaggerating the extent of their Class III skeletal pattern. In the vertical direction there was a tendency to position the chin more inferiorly, producing a longer face. Patients were able to consistently reproduce their perception of their facial soft tissue profile on a second attempt. Given the lack of awareness of their own profile, this questions the validity of using profile planning as a tool for patient communication and informed consent.
Type of Work: | Thesis (Masters by Research > M.Sc.) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Award Type: | Masters by Research > M.Sc. | |||||||||
Supervisor(s): |
|
|||||||||
Licence: | All rights reserved | |||||||||
College/Faculty: | Colleges (2008 onwards) > College of Medical & Dental Sciences | |||||||||
School or Department: | School of Dentistry | |||||||||
Funders: | None/not applicable | |||||||||
Subjects: | R Medicine > RK Dentistry | |||||||||
URI: | http://etheses.bham.ac.uk/id/eprint/13290 |
Actions
Request a Correction | |
View Item |
Downloads
Downloads per month over past year