Browsing by Author "Harris, Angela Manbre Poulter"

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    Accuracy of orthodontic digital study models
    (University of the Western Cape, 2012) Kriel, Earl Ari Mac; Harris, Angela Manbre Poulter; Johannes, K.C.
    Background: Plaster study models are routinely used in an Orthodontic practice. With the recent introduction of digital models, an alternative is now available, whereby three dimensional images of models can be analyzed on a computer. Aims and objectives: The aim of this study was to compare the measurements taken on digital models created from scanning the impression, digital models created from scanning the plaster model, and measurements done on the plaster models. The objectives were: Measurement differences between those taken directly on plaster models compared with measurements on digital models created from scanned impressions and digital models created from scanned plaster models. Methods: The study sample was selected from the patient records of one Orthodontist. They consisted of 26 pre-treatment records of patients that were coming for orthodontic treatment. Alginate impressions were taken of the maxillary and the mandibular arches. Each impression was scanned using a 3Shape R700™ scanner. Ortho Analyzer software from 3Shape was used to take the measurements on the digital study models. Within 24 hours plaster study models were cast from the impressions, and were scanned using a 3Shape R700™ scanner. On the plaster models the measurements were done with a MAX-CAL electronic digital calliper. The mesiodistal width as well as intermolar and intercanine width for both the maxillary and mandibular models were recorded.Results and discussion: Box plots used to compare the variability in each of the three measurement methods, suggest that measurements are less variable for Plaster. Plaster measurements for tooth widths were significantly higher (mean 7.79) compared to a mean of 7.74 for Digital Plaster and 7.69 for Digital impression. A mixed model analysis showed no significant difference among methods for arch width. Conclusions: Digital models offer a highly accurate alternative to the plaster models with a high degree of accuracy. The differences between the measurements recorded from the plaster and digital models are likely to be clinically acceptable.
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    Assessment of tooth movement in the maxilla during orthodontic treatment using digital recording of orthodontic study model surface contours
    (University of the Western Cape, 2006) Harris, Angela Manbre Poulter; Nortje, C.J.; Wood, R.E.; Dept. of Orthodontics; Faculty of Dentistry
    The aim of this project was to measure changes in dimension of the first three primary rugae and to evaluate tooth movement in the maxilla during orthodontic treatment in patients treated with and without premolar extractions.
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    Influence of orthodontic caregiver behaviour on the perceived satisfaction of patients during orthodontic treatment.
    (University of the Western Cape, 2014) Du Raan, Frederick Johannes; Harris, Angela Manbre Poulter; Hudson, A.
    Influence of orthodontic caregiver behaviour on the perceived satisfaction of patients during orthodontic treatment. Dr. F.J. du Raan M.Sc. (Orthodontics) thesis, Department of Orthodontics, University of the Western Cape. In this thesis I interviewed patients that are busy with orthodontic treatment, as well as those that have undergone orthodontic treatment at the department of Orthodontics at the University of the Western Cape, with the aid of four questionnaires. Patients completed questionnaires to provide general and demographic information, quantify their satisfaction with the orthodontic treatment process, their perception of the orthodontic clinician's behavioural traits and lastly they completed the NEO-FFI personality questionnaire to determine their own personality profile. All these questionnaires were used in previous studies, or they were slightly modified to be applicable to orthodontics. The information gained was used to determine if there are correlations between the patient’s perceived satisfaction of the treatment process with patient specific treatment variables (as acquired from the General information and Demographics Questionnaire ), demographic factors, clinician's behavioural traits and patient specific personality traits and any combination of the above mentioned. We wanted to determine which behavioural traits of the orthodontic caregiver influences the perceived satisfaction with the treatment to the greatest extent. Furthermore, we wanted to determine if certain personality traits of the patients would influence their perceived satisfaction with the treatment process or their perception of the clinician's behavioural traits. The only aspect from the General Information and Demographics Questionnaire that had any correlation to satisfaction with the treatment process or the perception of the clinician's behavioural traits, was whether the patient was treated by a single registrar or multiple registrars. Patients treated by multiple clinicians had a lower average score for satisfaction and orthodontist behaviour. Results from the study shows that all the clinician's behavioural traits do have statistically significant influence on the perceived satisfaction with the treatment process, but certain behavioural traits have a greater influence. Result showed Empathy and Care to have the strongest influence on perceived satisfaction, whereas Motivation has the lowest influence. The NEO-FFI personality questionnaire was used to register each patient's personality profile. Scoring for the following personality traits created the personality profile: Neuroticism, Extraversion, and Openness to Experience, Conscientiousness and Agreeableness. Patient personality profiles were shown to have no significant influence on the patient's perceived satisfaction with the treatment process.Neuroticism was shown to have a weak negative correlation with the Professionalism sub-category of the Orthodontic Clinician Behaviour Questionnaire. Conscientiousness has been shown to have a weak positive correlation with all categories of the Orthodontic Clinician Behaviour Questionnaire It is put forth by the researcher that more time and effort has to be put into improving all aspects of the clinician's behaviour, as it will positively influence the perceived satisfaction of the orthodontic treatment process.Even though there are no significant correlations, patients needs to be screened to determine their personality profiles, as this may lead to slight improved scoring on certain behavioural aspects which may in turn lead to greater patient satisfaction. It may be especially worthwhile to recognise the neurotic patient and treat them on a more personal level, as this may improve their overall satisfaction.
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    The perceived and normative orthodontic treatment need of a group of South African children
    (University of the Western Cape, 2015) Rampersadh, Yuvthi; Harris, Angela Manbre Poulter; Barrie, Robert
    Introduction: Improvement of aesthetics is often the reason patients seek orthodontic treatment. The ability to accurately assess aesthetic treatment need from the viewpoint of the patient is necessary. The threshold for orthodontic treatment is not constant in all countries and no previous attempts to determine this threshold has been made in South Africa. By ensuring that patient’s perceptions of treatment need are incorporated into the index chosen to assess perceived need, accurate data can be obtained. Determining perceived need from the patient’s viewpoint is important, and understanding its relationship with perceived need according to the professional, as well as normative need can facilitate better patient communication and management of expectations. Aims: There were three main aims of this study. First, South African children’s perceptions of treatment need according to the Aesthetic Component (AC) of the Index of Orthodontic Treatment Need (IOTN) was assessed to determine if they were similar to those of the dentists who established the threshold, or if the threshold of the grading system should be altered to better suit laypeople’s opinions. Second, the newly established threshold could then be used to determine the perceived needs for orthodontic treatment, and compare them to the normative need of the population. Finally, factors that may influence the perceived needs of the patients such as gender, ethnicity and socio-economic position could be investigated. Methodology: A cross-sectional study on 317 children aged between 11 and 14 years was done. 43.8% were male and 56.2 % were female. The sample was chosen from five schools in the Lekwa District of Mpumalanga using a multi-stage sampling technique. The study population comprised of four groups based on ethnicity; Asian (3%), black (74%), coloured (6%) and white (17%). The socio-economic position (SEP) was determined by Principal Component Analysis of household assets. Societal perceived, subjective perceived and self-perceived needs were assessed using a questionnaire and the child-rated AC of the IOTN. An intra-oral examination was conducted using the AC of the IOTN to assess objective perceived need and the modified Dental Health Component (DHC) of the IOTN to assess normative treatment need. Results: Treatment threshold was determined to be grade 3 of the AC of the IOTN according to societal perceived need of the group of South African children, and was confirmed by self-perceived need. Subjective perceived need for treatment was assessed using the AC grade participants felt best reflected their aesthetic impairment, and was found to be 20.2%, compared to actual self-perceived need of 38.5%. The latter was deduced by comparing the child-rated AC (subjective perceived need) to their perception of treatment need of that grade (societal perceived need). The objective perceived need measured by the examiner-rated AC was 60%. Definite need for orthodontic treatment based on the modified DHC of the IOTN was 41.2%. No significant difference between societal perceived or self-perceived need and gender or socio-economic position was found. White children have lower societal perceived treatment need regarding others’ aesthetic impairment. Conclusion: The treatment threshold grade should be lowered to better represent the societal perceived and self-perceived need of the South African population. Normative need was higher than perceived needs from the patients’ point of view (subjective perceived and self-perceived need), but lower than the perceived need from the professional’s point of view (objective perceived need). Ethnicity was found to have an influence on societal perceived need.