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Biomedical subjects

S J Cunningham

Publications and source records attributed to S J Cunningham.

At least 19 recordsLinked to original sources

Economic evaluation of healthcare--is it important to us?

Economic evaluation is now an accepted method for the appraisal of healthcare programmes. Although it is used widely in medicine, its use in the field of dentistry is only just beginning to achieve popularity. Economic evaluation in dentistry is likely to become increasingly important in the future and this paper aims to introduce the basics of the technique as well as describing some of the dental settings in which it is currently being used.

Cost Control↗

Development of a condition-specific quality of life measure for patients with dentofacial deformity: I. Reliability of the instrument.

UNLABELLED: The assessment of quality of life is becoming increasingly important in clinical research. Its importance in dentistry has been realised only relatively recently. Health-related quality of life is concerned with the aspects of quality of life that relate specifically to an individual's health. This may be measured using two groups of instruments: (i) generic measures, which provide a summary of health-related quality of life and sometimes generate a single index measure of health or (ii) condition-specific measures, which focus on a particular condition, disease, population or problem and are potentially more responsive to small, but clinically important, changes in health. OBJECTIVES: The aim of this study was to develop a condition-specific quality of life measure for those patients with severe dentofacial deformity who were requesting orthognathic treatment and to assess the reliability of this instrument. METHOD: Instrument content was derived through a literature review and interviews with clinicians and patients. The resulting instrument was tested for internal consistency and test-retest reliability. RESULTS AND CONCLUSION: The instrument was found to divide into four clinically meaningful domains. Internal consistency and test-retest reliability were good. Patient acceptance of the questionnaire was also encouraging.

Health Services Needs and Demand↗

Are orthognathic patients different?

This questionnaire-based study investigated the psychological profile of orthognathic patients prior to starting treatment and compared the findings with a control group of non-patients. Comparison of the data used multivariate multiple regression analysis where outcome variables and independent variables were studied simultaneously. Some differences were found in the psychological profile of the orthognathic patient. They displayed higher levels of state anxiety (P < 0.001), higher numbers of individuals in their social support network (P < 0.05), and lower body image and facial body image (P < 0.001). Self-esteem was also found to be lower, but only at borderline levels of significance (P = 0.052).

Age Factors↗

A comparison of health state utilities for dentofacial deformity as derived from patients and members of the general public.

The cost-utility approach is a method of economic evaluation, which assigns a ratio of cost to benefit, based on utility values of the health state in question. It allows efficient use of health care resources and is a useful method in that it permits comparison of a wide range of medical interventions, including those which are life saving and those that improve quality of life. This study obtained utility values for dentofacial deformity from orthognathic patients and members of the general public using three recognized methods--rating scale (RS), standard gamble (SG), and time trade-off (TTO). There were no significant differences between the utility values for the two groups of respondents. Method agreement between the TTO and the SG (the 'gold standard') was better than that between the RS and SG. In addition, the SG and TTO were found to have greater repeatability than the RS.

Adult↗

An investigation into the effects of polishing on surface hardness and corrosion of orthodontic archwires.

The purpose of this study was to investigate the effect of surface roughness on the relative corrosion rates of wires of four alloys-stainless steel, nickel titanium, cobalt chromium, and beta titanium. Batches of wire were divided into two groups. Wires in one group were industrially polished to provide a uniform surface finish; wires in the other group were left for comparison "as received." Wire diameter, hardness, and relative corrosion rates were compared within groups before and after polishing. Comparisons were also made across the four groups of alloys. The samples of as-received wires showed variations in surface finish, with beta titanium having the roughest appearance and cobalt chromium the smoothest. Nickel titanium and stainless steel surfaces were similar. Polishing provided a more uniform finish, but significantly reduced the diameter of the wires. Microhardness testing of wire surfaces of each alloy indicated that no significant work-hardening occurred as a result of polishing. The relative corrosion rates (expressed in terms of corrosion current density) in a 0.9% sodium chloride solution were estimated using the electrochemical technique of polarization resistance. Nickel titanium wires exhibited the greatest corrosion current density in the as-received state. Polishing significantly reduced the corrosion rate of nickel titanium, such that comparison between the four alloys in the polished state revealed no significant difference in their relative corrosion rate/corrosion current density.

Chromium Alloys↗

The psychology of facial appearance.

Facial attractiveness is now recognized as being important in situations as diverse as education, relationships and employment. An individual's facial appearance is one of their most obvious characteristics and facial disfigurements are judged to be among the least desirable 'handicaps'. A face which deviates from the norm becomes a stigma. This paper looks at the complex area of facial appearance and its importance in the field of dentistry. The relationship between facial attractiveness and varying forms of dental and surgical intervention are discussed, as well as some of the problems which may be encountered during treatment.

Craniofacial Abnormalities↗

Providing immunizations in a pediatric emergency department: underimmunization rates and parental acceptance.

OBJECTIVES: To assess the vaccination status and vaccinate eligible children with age-appropriate antigens. DESIGN: Intervention. SETTING: Pediatric emergency department in an urban, public hospital. PATIENTS: Convenience sample of children, aged birth through 72 months. INTERVENTIONS: Immunization of eligible children. MAIN OUTCOME MEASURES: 1) Immunization coverage rates in the sample population, 2) Acceptance rates of immunization. RESULTS: A total of 9321 children were enrolled over a 2-year period. Fifty-nine percent were documented to be underimmunized. Overall, 2514 children received a total of 6482 immunizations. Parents who carried portable immunization cards documenting that their child was underimmunized were almost five times more likely to accept immunization for their child than parents who lacked documentation (71% vs 15%, P < 0.0001). The estimated cost of providing immunizations in the emergency department was $47.15 per child immunized, or $18.56 per immunization given. CONCLUSIONS: The majority of children with documentation of immunization status were underimmunized. When documentation of underimmunization was available, parents were significantly more likely to accept vaccination. These data suggest that vaccinating children in nontraditional settings is feasible and support the creation of an accessible vaccine registry.

Child↗

Soft tissue changes associated with incisor decompensation prior to orthognathic surgery.

A retrospective cephalometric study employing angular and linear measurements was undertaken to examine soft tissue changes associated with incisor decompensation prior to orthognathic surgery. Subjects were divided into 3 groups based on the presenting malocclusion, and radiographs for each subject were traced and subsequently digitized. The results showed that incisor decompensation was achieved more markedly in Class II division 2 and Class III patients. In Class II division 1 subjects, changes in the mandibular incisor inclination were contrary to what was anticipated. The soft tissue change/dental change ratio following incisor decompensation showed that the soft tissues were least affected in the Class II division 2 group. This may be due to the increased tone of the soft tissues in this group, which resisted the effects of the incisor change. Alternatively, it may indicate that the soft tissue "drape" is not in close approximation to the dentition and therefore dental changes are not transmitted to the soft tissues.

Cephalometry↗

A comparison of the perception of facial profile by the general public and 3 groups of clinicians.

Orthodontists and maxillofacial surgeons frequently plan orthognathic treatment to produce an "ideal" Class I occlusion and skeletal relationship. The aim of this study was to investigate whether the preferred facial profile chosen by orthodontists, maxillofacial surgeons, dental students, and members of the general public conformed to a Class I profile. Photographs were taken of 2 male and 2 female adult subjects with Class I profiles, and by means of a computer program the images were manipulated to produce Class II, Class III, and long face profiles. The orthodontists, surgeons, dental students, and members of the general public ranked each group of 4 photos in order of their attractiveness. Orthodontists and maxillofacial surgeons were found to be significantly more likely to choose a Class I skeletal relationship as the most attractive profile. A significant difference was found between orthodontists and dental students (P < 0.01) and between orthodontists and the general public (P < 0.001) with regard to the assessment of the Class I profile as the most attractive, when all 4 subjects were considered. Similar results were noted for maxillofacial surgeons. Whether the assessor was an orthodontist, maxillofacial surgeon, or a member of the general public was found to be significant when examining subjects 1 (female) and 3 (male). The sex of the assessor was also a significant factor for subject 3 (male), where female assessors were more likely to rank the Class I profile as most attractive (P < 0.05).

Adult↗

The use of kinesiography to assess mandibular rest positions following corrective orthognathic surgery.

This study utilized the kinesiograph to assess the effect of orthognathic surgery on mandibular rest positions in a group of 27 patients exhibiting vertical facial deformities (14 long faced and 13 short faced patients). Two distinct rest positions were confirmed--clinical and physiological. Following surgery to alter the vertical dimensions, the clinical freeway space was found to adapt immediately whereas the physiological rest position partially adapted in the immediate postoperative period and continued to do so over the following year.

Adaptation, Physiological↗

The effect of two alternative methods of canine exposure upon subsequent duration of orthodontic treatment.

OBJECTIVES: The aim of this study was to compare the effectiveness, in terms of orthodontic treatment duration, of two methods of canine exposure. DESIGN: This was a retrospective study using patients' records and lateral cephalometric radiographs. SAMPLE AND METHODS: 50 patients were selected, 25 in each group. In all subjects the impaction was categorized as being 'intermediate'. The methods of canine exposure were: (i) simple surgical exposure; (ii) surgical exposure and placement of an orthodontic attachment, followed by flap replacement. RESULTS: The treatment duration until the canine was in the line of the arch was 17.7 months in the simple exposure group and 19.3 months in the bonded attachment group. The mean treatment duration (from exposure to debond) was 28.8 months for both groups. CONCLUSIONS: In terms of treatment duration, no significant difference could be demonstrated between the two methods of surgical exposure to palatally impacted canines.

Adolescent↗

Psychological assessment of patients requesting orthognathic surgery and the relevance of body dysmorphic disorder.

The psychological assessment of patients requesting orthognathic treatment is a vital and integral part of the overall assessment procedure. It allows identification of potential problems at an early stage before irreversible decisions have been made. This paper aims to highlight some of the aspects of psychological assessment which are particularly important. It also discusses current concepts in the diagnosis and treatment of those patients suffering from body dysmorphic disorder (BDD). This is the term applied to those individuals with a normal appearance who present requesting treatment because they believe that they have a 'defect'.

Humans↗

Parental perceptions of access to care and quality of care for inner-city children with asthma.

The objective of this study was to describe perceptions of asthma care, morbidity, and health service utilization by parents of children with asthma presenting to an inner-city emergency department (ED). A cross-sectional survey was conducted in an urban pediatric ED, with a convenience sample of 466 parents of children receiving asthma treatment during a consecutive 6-week period in late fall 1995. Parents completed a 30-item survey including sociodemographic data, source of primary medical care and asthma care for their child, selected measures of access to care, and medications used by their child in the week prior to the ED visit. Perceived quality of asthma care was measured by six items (summary score = 0-6) reported to have been performed by the child's asthma doctor: discussion of home peak flow monitoring, child-specific triggers, dogs/cats, smoke, postexacerbation calling instructions, and provision of a written asthma management plan. Functional morbidity was measured by nights of poor sleep, days of cough, and school days missed due to asthma in the previous month. Among 325 patients with previously diagnosed asthma, 308 (97%) were reported to have a source of primary medical care. Of these, 126 respondents identified their primary care provider as the child's usual source of asthma care, while 158 identified the ED as the usual source. The groups did not differ by insurance status, ethnicity, or mean age of the child. Thirty-nine percent of children with the same provider for primary and asthma care compared with 15% of children reported to receive their asthma care predominantly in the ED had used inhaled steroids or cromolyn in the week prior to the ED visit (p < .0001). Children with the same provider for primary and asthma care had a higher mean quality score than children receiving asthma care in the ED (3.7 vs. 2.8, p < 0.0001), but there was no relationship between source of asthma care and functional morbidity. The ED remains the usual source of asthma care for many inner-city children. Among parents surveyed in the ED, there was a significant relationship between source of usual asthma care and quality of care, but a relationship between usual source of asthma care and functional morbidity could not be identified.

Adult↗

Stability of mandibular incisor decompensation in orthognathic patients.

This retrospective cephalometric study examined the stability of mandibular incisor decompensation following orthognathic treatment. It also studied the relationship between the mandibular incisor-mandibular plane angle (LIMnp) and the maxillary-mandibular planes angle (MMA). Two groups of 22 subjects each underwent either mandibular advancement only or bimaxillary surgery with mandibular setback. Serial radiographs of each subject were digitized. Twenty-seven Class I subjects who were part of the Leighton Growth Study served as the control. The control group showed a significant association between LIMnp and MMA. For the surgical groups, the only significant relationship between LIMnp and MMA was seen in the mandibular advancement group at debond. No definite indicator was found to suggest that the final MMA dictates the amount of mandibular incisor relapse following debond. Only the bimaxillary group showed an association between changes in LIMnp and changes in MMA during the review period.

Adult↗

The influence of orthognathic surgery on occlusal force in patients with vertical facial deformities.

This study utilized bite-force measurements to determine the effect of various orthognathic surgery procedures on occlusal force generation in 42 patients with vertical facial deformities. The results showed that orthognathic surgery produced marked alterations in occlusal force levels which continued to occur up to a year after surgery. Measurements indicated that advancement of the mandible may result in weaker force levels, while bimaxillary surgery for the treatment of a "long face" brings the previously weaker bite force to a more "normal" level.

Adult↗