Search PubMed⌕ Search

Biomedical subjects

E A BeGole

Publications and source records attributed to E A BeGole.

52 records · Page 3Linked to original sources
PubMed1984

Tooth morphology and lower incisor alignment many years after orthodontic therapy.

The dental models of seventy-seven orthodontically treated patients were evaluated to determine the contribution of lower incisor tooth dimensions to their alignment many years after treatment. Tooth dimensions included the maximum mesiodistal (MD) and faciolingual (FL) dimensions and the shape ratio represented by MD/FL. Incisor alignment was assessed by means of Little's irregularity index, and all measurements were recorded to the nearest 0.1 mm with modified dial calipers. Multiple regression analysis revealed that the total contribution of all these lower incisor dimensions accounted for only 7.4% of the variability in their alignment, which was not statistically significant. A similar lack of association between lower incisor tooth dimensions and their alignment was found in a sample of eighty-six adults with untreated malocclusions. It therefore appears that the size and shape of the lower incisors do not significantly contribute to their alignment many years after orthodontic treatment.

Adult↗
PubMed1984

Computer based methodology for construction of orthodontic arch wire templates.

This paper presents the details and logic of two Fortran computer programs. The program, BRACKET, is designed to evaluate the constant relationship among teeth and orthodontic brackets to which an arch wire is adapted. The program, WIRE, is used to initially fit brackets to teeth using the constants derived in BRACKETS, based upon a series of orthogonal transformations. Subsequently, an orthodontic arch wire is fitted through the brackets, and the results are displayed using computer graphics. It is anticipated that the system would be useful in the orthodontic clinical setting as an aid in arch wire formation. The graphics produce a template which incorporates essential points to consider in arch wire formation, namely, perimeter length, lateral widths, symmetry, and appropriate arch form for the patient.

Computers↗
PubMed1983

Long-term stability of dental relationships after orthodontic treatment.

Adult changes in selected occlusal parameters are measured, with the study sample limited to 72 subjects with a history of malocclusion treated orthodontically 12 to 35 years previously. Variations were large. Most of the corrections were retained, with mean changes tending toward pretreatment values.

Dental Arch↗
PubMed1982

Diagnosis and treatment of class II division 2 malocclusion.

Class II, Division 2 malocclusions often have skeletal patterns more nearly approaching Class I than Class II, Division I. Incisor relationships are unique. Treatment problems related to this malocclusion require that the clinician pay particular attention to the vertical dimension. Also, the prevalence of mandibular movement pattern irregularities, coupled with the "droopy incisor" phenomenon so characteristic of this malocclusion, requires careful individual case analysis. The use of simplified initial appliance mechanics to rectify some of these problems is discussed.

Cephalometry↗
PubMed1981

Long-term effects of orthodontic treatment on periodontal health.

The periodontal health of a group of ninety-six patients who had received comprehensive fixed-appliance orthodontic treatment during adolescence between 12 and 35 years previously was evaluated. Comparisons were made with a group of 103 adults who were similar with regard to race, sex, age, socioeconomic status, dental awareness, and oral hygiene status but had malocclusions that had not been orthodontically treated. There were no statistically significant differences in the general prevalence of periodontal disease between the two groups. However, more detailed analysis revealed that the orthodontic group had a greater prevalence of mild to moderate periodontal disease in the maxillary posterior and mandibular anterior regions of the mouth, as compared to the control group. The results suggested that orthodontic treatment in adolescence is not a major factor in determining the long-term periodontal health status. No significant amount of either damage or benefit to the periodontal structures could be directly attributed to orthodontic therapy. Conversely, the lack of orthodontic therapy in adolescence does not appear to influence subsequent development or nondevelopment of periodontal disease in adults.

Adult↗
PubMed1980

Dimensional changes in the dental arches of orthodontically treated cases.

Integrated data from lateral cephalometric radiographs and study models of fifty-three patients were studied to assess the interactions between dimensional changes occurring during orthodontic treatment and the postretention stability of these changes. A new technique was developed to study distal movement of canines. Distal movement of canines did not ensure a stable increase in intercanine width. There was no significant relationship between mesiodistal position of the first molars and changes in intermolar width. Eruption of the first molar in the postretention period was associated with greater stability in overbite. There was no great degree of correlation between depth of the curve of Spee and inclination of the occlusal plane or between changes in arch length and changes in inclinations of the incisors.

Cephalometry↗
PubMed1980

Verification and standardization of cephalometric coordinate data.

This paper presents the details and logic of the FORTRAN computer programs designed to verify the accuracy of digitized coordinate data arising form cephalometric radiographs, prior to entry into a databank. In addition, the software accounts for varying magnifications of the radiographs which result from the use of different cephalometers, Finally, data from all records are oriented in the same coordinate system, thus standardization of the data has been accomplished. As a result of the two programs, the user may be guaranteed accurate and comparable data for any or all records contained in the databank.

Cephalometry↗
PubMed1980

Software development for the management of cephalometric radiographic data.

This paper presents the details and logic of a set of three IBM System 370 Assembler Language programs designed to manage a data bank, of ever increasing magnitude, which contains coordinate data obtained from cephalometric radiographs. The data from the radiographs, and consequently, the programs, are primarily intended for use by the orthodontist who is engaged in clinical research, and are especially useful in studies related to changes within the facial and dental complexes which occur as a result of growth and orthodontic treatment.

Cephalometry↗
PubMed1979

Craniofacial morphology: a principal component analysis.

A series of 56 measurements was derived from lateral cephalometric radiographs of a large sample of subjects. These measurements were subjected to a principal-component analysis which resulted in a series of six components (factors). These factors, represented in general terms and in rank order of their percentage sample variability were as follows: Factor 1. Vertical facial characteristics Factor 2. Anteroposterior aspects of facial morphology Factor 3. Midfacial and dental protrusion Factor 4. Relationship of the mandible and dentition to the profile Factor 5. Horizontal base-line relationships (internal or deep) Factor 6. Maxillary incisor relationships These principal components and the variables contained within them were shown to have sex and age interactions. A longitudinal study of the principal component changes with age was then undertaken. Demonstrable age changes were verified for Factors 1, 2, and 3, and Factors 1 and 3 were observed to show patterns of change which were statistically different from each other and the remaining principal components. An orthodontically treated sample of patients was also assessed for factor changes. Factors 1 and 2 were found to show statistically reliable changes resulting from treatment and/or growth. The remaining four factors showed no statistically supportable alteration. The data-reduction method involving a principal-component analysis would seem to have potential research and clinical applications.

Adolescent↗
PubMedDate not supplied

A computer program for the analysis of dental arch form using the catenary curve.

This paper presents the logic and details of a FORTRAN computer program which fits a two parameter catenary curve, using the method of least squares, to a set of data points arising from an exact size photograph of a dental model. Error is assessed by evaluating the difference between the observed and fitted y values. Finally, the length of the arc is measured. The program is useful in studies related to dental arch form as a part of orthodontic treatment. The measurement of the arc length provides as assessment of space available in the dental arch, which is an important part of treatment planning for the orthodontic patient.

Computers↗