IU Indianapolis ScholarWorks :: Browsing by Author "Garner, LaForrest D."

Browsing by Author "Garner, LaForrest D."

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A Cephalometric Investigation of Hypohidrotic Ectodermal Dysplasia
(1981) Harbour, John P.; Bixler, David; Garner, LaForrest D.; Sondhi, Anoop; Shanks, James C.; Bowman, Sally A.
The characteristic features of hypohidrotic ectodermal dysplasia were first reported in 1848 by Thurnam. Since this first classification, the characteristic facies of this syndrome have often been reported. Individuals with this disease have been described by various authors as having a prognathic mandible, an underdeveloped mandible, a small face, an elongated maxilla, an anteriorly positioned maxilla, a midface hypoplasia, and more. Only one cephalometric study of this syndrome exists and it was performed to study growth. The present study was designed to describe and quantify, through the use of cephalometric analysis, any facial and cranial variations in these patients. The study also attempted to describe the variations found in female heterozygotes. Nine hypohidrotic ectodermal dysplasia patients and their families were studied. A total of 31 individuals participated. When the data obtained from the cephalometric measurements were grouped into probands, gene carriers (heterozygous females), and normals, it was found that certain variations did exist. The size and position of cranial base and the mandible in all three groups were within normal limits (±2 S.D.). The maxillae of the probands were significantly short, yet positioned normally. The gene carriers also showed this trend, but the results were not significant. Profiles (soft and hard tissue) were significantly concave in the proband and gene carrier groups due to a combined effect of altered maxillary and mandibular positions.
A Cephalometric Skeletal and Dental Analysis of Selected Black American Children in the Indianapolis Area
(1975) McDonald, Jeanne L.; Garner, LaForrest D.; Shanks, James C., Jr.; Arbuckle, Gordon R.; Potter, Rosario H.; Dirlam, James H.
This study was conducted to obtain hard-tissue cephalometric standards for Black American children of twelve years of age. A sample of twenty-four Black American children from the Indianapolis area (thirteen boys and eleven girls} was analyzed and compared with the existing Denver (Caucasian} sample of comparable age. This study was conducted to obtain hard-tissue cephalometric standards for Black American children of twelve years of age. A sample of twenty-four Black American children from the Indianapolis area (thirteen boys and eleven girls} was analyzed and compared with the existing Denver (Caucasian} sample of comparable age. There were only eight measurements that showed no statistical difference from the White standards for both males and females: cranial flexure angle, gonial angle, mandibular plane angle, A-B(OP}, A-B(FH}, A-Pg(OP}, Y-axis angle, and cant of the occlusal plane. There were no significant differences between Black males and Black females. All the linear measurements were significantly larger for the Black sample, except for the chin button (which was significantly smaller in the Blacks}. There was a proportionally larger increase in the mandibular body over the ramus of the mandible in the Black sample; there was a proportionally larger increase in the lower facial height over the upper facial height. In the Black sample, the nasal floor converged upward anteriorly with respect to Frankfort Horizontal. The denture bases and lower face were more protrusive in Blacks; the incisors were more flared and bodily forward. Black patients, therefore, should not be compared to standards set up for Caucasians, but to a set of standards based on normals of their own ethnic group.
A Manpower Study of Orthodontic Specialists for the State of Indiana
(1992) Clark, David B.; Roberts, W. Eugene; Arbuckle, Gordon R.; Garner, LaForrest D.; Garetto, Lawrence P.; Shanks, James C.
Dental manpower has been studied at national, state and local levels.2, 4, 6, 11, 14, 15, 17-19 Manpower studies of orthodontic specialists also have been conducted,1, 5, 13, 16 but there has been no recent manpower study relative to orthodontic specialists in Indiana. The purpose of this study was to evaluate the busyness and distribution of orthodontic specialists in Indiana and project the need for orthodontists. In early 1990 a survey questionnaire was mailed to Indiana orthodontists. A telephone survey of orthodontic receptionists/appointment clerks was conducted during the same time period to obtain a separate source of data relative to practice busyness and to help evaluate the reliability of the mailed survey questionnaire. The distribution of orthodontists was evaluated by comparing the state population-to-orthodontist ratio to county and regional ratios. The response rate of the mailed survey questionnaire was 91 percent. The ages of orthodontists were evenly distributed with the exceptions of the 46-50 year age group and groups approaching retirement ages. The perceived level of busyness was low with a busyness index of 1.32. A relatively short wait was necessary to examine and start new patients, and few reported a waiting list. There was a high response emphasizing no need for additional orthodontists. Seventy percent felt that they were not busy enough; 99 percent reported that they would like more patients; and many desired large numbers of additional patients (41 or more). A large number of orthodontists had satellite offices or were considering establishing satellite offices with an insufficient patient base listed as the primary reason. There was a significant difference between the number of additional patients desired based on the age of the orthodontist. More orthodontists reported that patient loads were remaining the same or declining rather than increasing. The present data did not support the premise that the number of patients started was less than that seen in previous studies, suggesting that the low perception of busyness may be related to other factors such as a more recent decline in patient load, improved efficiency, decreased profitability or a combination of these or other factors. The telephone survey differed significantly from the mailed survey questionnaire indicating a possible bias in the survey questionnaire. A geographic maldistribution of orthodontists in Indiana was found. A slight increase in the number of orthodontists over the next decade would be necessary to maintain the present population-to-orthodontist ratio. However, the declining child population, representing the majority of orthodontic patients, will require a reduction in the number of orthodontists to maintain the present adjusted population-to-orthodontist ratio or patient-to orthodontist ratio over the next two decades.
A Study of the Effectiveness of Topical Fluoride Treatment Following the Removal of Direct Bonded Brackets
(1976) Short, Steven T.; Garner, LaForrest D.; Kasle, Myron J.; Cunningham, Donald M.; Shanks, James C., Jr.; Barton, Paul; Phillips, Ralph W.
In this investigation an attempt was made to determine what effect direct bonded attachments have on the posttreatment uptake of topically applied fluoride. Thirty-two freshly extracted mandibular central and lateral incisors were used. The teeth were cleaned, labeled and an adhesive tape window applied to the crown exposing a circular area one quarter inch in diameter on the labial surface. An initial enamel biopsy was performed to determine the fluoride content of the labial surface. Fifty percent phosphoric acid was applied for one minute to condition the teeth for bonding. A polycarbonate orthodontic bracket was then bonded with Sevriton resin and each tooth was stored for one week in water. After storage, the brackets were then removed and residual resin was cleaned off with a dental scaler. Half of the teeth were pumiced with flour of pumice for ten seconds. The teeth were observed microscopically to determine the condition of the labial surface. A 2% solution of sodium fluoride was applied to the teeth for eight minutes and the samples were then individually stored in water for one week. An enamel biopsy was performed and analyzed for fluoride, calcium, and phosphorus. A great deal of fluoride was taken up by the enamel surface on all the specimens. It was found that pumicing the teeth prior to the application of topical fluoride results in a significantly greater uptake of fluoride by the enamel surface. The results of this investigation indicate that a pumice wash following bracket removal facilitates a greater and more uniform uptake of topically applied fluoride on the surface of the teeth.
An Investigation of Dental Arch Form in a Sample of Malocclusions
(1975) Page, Robert M.; Garner, LaForrest D.; Shanks, James C., Jr.; Dirlam, James H.; Potter, Rosario H.; Barton, Paul
The objective of this study was to investigate the geometric arch forms found in a sample of malocclusions. The specific objectives were to determine if there was a basic geometric arch form which described all of the sample, to identify the typical arch form in each of the classes of malocclusion, and to determine if there was a statistical difference in form among the various classes in each arch. A sample of 99 maxillary and mandibular plaster casts were collected from the Department of Orthodontics, Indiana University School of Dentistry, and classified according to Angle's classification of malocclusion. Occlusograms were taken of all casts. The center of incisal edges, cusp tips of cuspids and bicuspids, and bifurcation of molars were marked and traced on acetate tracing paper from the occlusogram). A straight line was drawn between these points giving the final dental arch form. A coordinate· system was established on each arch form which allowed the classification of the arch form by Hayashi's method 60. The results showed that no basic arch form described the sample. The average arch form for each classification of malocclusion varied between classes and between arches. Statistically, maxillary arch form of the Class II division 2 differed significantly from maxillary Class I, Class II division 1, and Class III malocclusions. Class II division 2 mandibular arch form differed significantly only from the mandibular Class I malocclusion.
An Analysis of Possible Factors Affecting the Soft Tissue Response in Postadolescent Orthodontic Patients
(1975) Cowan, Richard Edward; Garner, LaForrest D.; Potter, Rosario H.; Mitchell, David F.; Tomich, Charles E.; Hutton, Charles E.; Weinberg, R. Bernd
This study was carried out to evaluate the factors which may vary the soft tissue response in non-growing subjects. Pretreatment and post-treatment lateral cephalometric radiographs of twenty-nine postadolescent orthodontic patients were measured with a sonic digitizer using facial plane as the reference. Stepwise multiple regression analysis was performed to select those factors from the original set of 6 according to the statistical significance of their contribution in the prediction of the soft tissue response. It was found that 30.84% of the horizontal upper lip response is due statistically to the maxillary incisor change and the pretreatment upper lip thickness at the vermillion border. This study also revealed that 67.76% of the horizontal lower lip response is due statistically to the mandibular incisor change, the pretreatment upper lip thickness at A-Point, and the mandibular postural change. Additionally, 16.50% of the vertical upper lip response is due statistically to the mandibular incisor change. Further, 33.39% of the vertical lower lip response is due statistically to the mandibular postural change and the pretreatment upper lip thickness at A-Point. Finally, the majority of the total variation in lip response is still not accounted for and therefore further research is needed.
The Analysis of Three Space Closing Assemblies
(1976) Cook, Thomas Bowers; Garner, LaForrest D.; Shanks, James C.; Potter, Rosario H.; Dirlam, James H.; Barton, Paul
This investigation compared the spring characteristics of three space closing assemblies; the classic "Bull" loop and two new spring designs currently being used in the Department of Orthodontics at Indiana University. Using interbracket distance and the degree of gable preactivation as variables, a complete laboratory analysis was carried out on each spring design. A total of two hundred springs were tested. A statistical investigation was conducted to determine if the spring designs had significantly different load-deflection rates, moment to force ratios, and range of activation. The range of activation for all three spring designs was large enough to be of some minor importance in determining the difference in efficiency of each design. However, when the load-deflection rates and moment to force ratios of the "Bull" loop and the two new spring designs were compared, the new spring designs invariably proved to be superior. From this laboratory study, it was concluded that the two new spring designs have the potential of providing a more efficient method of orthodontic space closure.
Apert Syndrome : A Descriptive Analysis of Selected Computed Tomographic Images of the Craniofacial Complex
(1988) Schafer, Alan Boulware; Garner, LaForrest D.; Bixler, David; Hennon, David K.; Kasle, Myron J.; Miller, James R.; Shanks, James C.
The purpose of this study was to demonstrate how selected computed tomographic images of the craniofacial complex may be used in a descriptive evaluation of cranial dysmorphology in living subjects with Apert syndrome. Computed tomographic images using coronal sections through the optic disc, planum sphenoidale, and axial sections through petrous ridges, pterygopalatine fossa, and midorbital level from two Apert syndrome and two non-syndrome controls were evaluated. Reference lines were established using actual and constructed landmarks. The results were tabulated for all four subjects. The two Apert subjects (in contrast to the non-syndrome subjects) demonstrated the following: a) orbital proptosis with a reduced bony orbital depth and elongation of the orbits in a superior direction with an altered vertical orbital axis b) increased lateral orbital wall angle c) alteration of the anterior cranial base with depression of the ethmoid complex d) midface regression Interestingly, ocular hypertelorism, which has been reported to be a feature of Apert syndrome, could not be confirmed by use of these CT scans. The findings obtained from this study are consistent with the published characteristics of Apert syndrome. In conclusion, this study demonstrates the utility of computed tomographic images in the evaluation of craniofacial dysmorphology.
A Cephalometric Investigation of Cleidocranial Dysplasia
(1974-06) Davis, James Paul; Garner, LaForrest D.; Tomich, Charles E.; Bixler, David; Weinberg, R. Bernd; Dirlam, James H.
The characteristics of cleidocranial dysplasia were first reported in 1897 by Pierre Marie and Paul Sainton. Since this first classification of the disease, many radiographic and clinical signs have been associated with this entity. Individuals with this disease have been repeatedly described as having a relative prognathism of the mandible due to a small, retropositioned maxilla and an enlarged cranial base. The present study was designed to determine, through the use of cephalometric measurements, if there is truly a difference in the size and position of the maxilla and an enlargement of the cranial base in these affected individuals. Ten cleidocranial dysplasia patients ranging in age from three years to 53 years, and their immediate families were studied. Non-affected members were studied to provide an intrafamilial comparison of skeletal development. The data obtained from the cephalometric measurements showed that the cranial bases for this group were within normal limits, or tending towards the small size. The maxilla was of normal size and the position was normal or anteriorly positioned in all cases. The mandible was considerably larger in 70% of the affecteds studied. Radiographic investigation showed this group to have delayed ossification of cranial sutures and mandibular symphysis. Absent frontal and mastoid sinuses, orbital hypertelorism, osteopetrotic appearance of the cranium, and absent or hypoplastic nasal bones were also observed.
Clinical Evaluation of Glass Ionomer Cement as an Adhesive for the Bonding of Orthodontic Brackets
(1988) Miller, James R.; Garner, LaForrest D.; Moore, B. Keith; Shanks, James C., Jr.; Barton, Paul; Potter, Rosario H.
Glass ionomer cement has been shown in previous studies to retard decalcification and caries formation. This cement would be valuable in orthodontics if it proved to have adequate adhesive properties. Therefore, this study was designed to determine if there is a significant difference in the failure rate of brackets attached to teeth using a glass ionomer cement, Ketac-fil, and the failure rate of brackets attached to teeth using a conventional orthodontic adhesive system, Rely-a-bond. Six patients in the Department of Orthodontics at Indiana University School of Dentistry participated in this study. Each patient had 16 to 20 teeth available for bracketing. Direct-bond orthodontic brackets were attached to one-half of each participant's available teeth using Ketac-fil. Rely-a-bond was used to bond brackets to the remaining half of the teeth. Fifty-three brackets were placed with Ketac-fil, and 53 with Rely-a-bond. This study lasted a minimum of ten weeks for each patient. The following observations were made: 1) The failure rates for brackets attached with Ketac-fil and those attached with Rely-a-bond. 2) The type of bracket failure for brackets bonded with Ketac-fil. 3) Pre-study and post-study decalcification patterns of teeth with brackets attached with Ketac-fil. The bracket failure rate was 3.77% for the Ketac-fil group and 5.66% for the Rely-a-bond group. There was no significant difference between the failure rates of these two groups at the alpha = 0.05 level when tested with the Fisher Exact Probability Test. Of the two brackets that failed in the Ketac-fil group, only one was available for examination and it demonstrated a definite adhesive type of bracket failure. With respect to decalcification patterns, no obvious change in pattern occurred for teeth in the Ketac-fil group. There was no statistical difference between the failure rates of brackets attached with Ketac-fil and those attached with Rely-a-bond. Previous studies have shown that glass ionomer cements release fluoride and that this may retard decalcification and caries formation. Decalcification and caries formation around the margins of orthodontic brackets have been identified as potential risks of orthodontic treatment. Thus, the use of a glass ionomer cement as a bonding agent in orthodontics might reduce these potential risks without compromising the attachment of the brackets to teeth. This study provides the basis for more extensive clinical trials of glass ionomer cements as bonding agents for direct-bond orthodontic brackets.

Browsing by Author "Garner, LaForrest D."

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