Indiana University-Purdue University Indianapolis (IUPUI) / 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.

Indiana University-Purdue University Indianapolis (IUPUI) / It was the purpose of this study to discover if anteroposterior movement of the maxillary bones was possible. Seven cats were used as the experimental animals. An expansion device which produced a diagonal force from one maxillary cuspid to the opposite molar was inserted in five of the animals. Two animals were used as controls. The effects of the lateral and antero-posterior components of the force were studied by means of before and after models, oriented occlusal radiographs, and histologic sections. Antero-posterior movement did occur. The anterior movement was more evident than the posterior movement due to the response evoked in the premaxillary-maxillary and the maxillary-palatine sutures. The sutures which were compressed showed very little response when viewed in horizontal histologic sections as compared to the sutures which were under tension. The sutures under tension showed marked osteophytic production which generally grew parallel to the line of force application. This difference in response allowed one side to remain as an anchorage unit while the opposite side moved anteriorly. The lateral increase in width appeared to be stable. In one animal the force was removed for thirty six days prior to sacrifice. In this animal the stability of the antero-posterior movement was questionable.

INTRODUKTION OCH SYFTE: Tidigare studier av kooperation och ortodonti har visat att ett av de bästa sätten att öka patienternas kooperation är genom att övervaka användningstiden och påminna patienten om att använda sin apparatur. Den här pilotstudiens syfte var att undersöka om någon utav två olika typer av påminnelser objektivt ökar användningstiden vid behandling med avtagbar apparatur eller inte.MATERIAL OCH METOD: 18 patienter i åldrarna 9-14 års ålder från en patientpopulation som behandlades vid avdelningen för Ortodonti, Odontologiska Fakulteten på Malmö Högskola, deltog i studien. Patienterna hade olika typer av bettavvikelser som gjorde dem behandlingsbara med antingen van Beek eller expansionsplåt. Patienterna placerades slumpmässigt in i en av tre grupper, alarm, kalender eller kontrollgrupp. Användningstid registrerades objektivt med en TheraMon®-timermodul som placerades inuti den ortodontiska apparaturens akrylbas.RESULTAT: Alarm-gruppen hade högst genomsnittlig användningstid. Kontrollgruppen hade något lägre användningstid än alarmgrupppen och kalendergruppen hade minst genomsnittlig användningstid. Det var skillnad på de olika behandlingstyperna, då behandlade med expansionsplåt hade bättre genomsnittlig användningstid än patienter behandlade med van Beek. Data testades för statistisk signifikans med Anova och t-test, ingen statistisk signifikans fanns.KONKLUSION: Den här studiens resultat tyder på att en påminnelse i form av ett alarm verkar vara bättre på att öka patienters kooperation än en kalender eller ingen påminnelse alls. Detta indikerar att det finns ett underlag för att i framtida studier vidare undersöka hur påminnelser via mobiltelefon påverkar compliance, till exempel påminnelse via en app. Patienter som behandlas med expansionsplåtar verkar ha en bättre compliance än patienter behandlade med van Beek-aktivatorer, därför bör framtida fokus läggas på att förbättra kooperationen hos patienter som behandlas med van Beek-aktivatorer. Framtida studier bör endast innefatta en typ av ortodontisk apparatur, till exempel van Beek. Fler patienter krävs i framtida studier för att säkerställa statistiskt signifikanta resultat. / INTRODUCTION AND PURPOSE: Earlier studies on compliance and orthodontics have shown that one of the best ways to increase compliance is by supervising the wearing time. Compliance can also be increased by reminding the patient to use the removable appliance. This pilot study aims to investigate if any of two kinds of reminders objectively increase the compliance during orthodontic treatment with removable appliances or not.MATERIALS AND METHODS: 18 patients between 9-14 years of age were selected from a patient population attending the department of Orthodontics, Faculty of Odontology, Malmö University. They presented different types of malocclusion which made them candidates for treatment with either van Beek-appliances or expansion plate. The patients were randomly placed in one of three groups; alarm, calendar or control group. Wearing time was objectively collected from the TheraMon®-module placed inside the acrylic base of the appliances. After the data collecting-phase was finished the data was tested with Anova and t-test to determine whether there was a significant difference between the groups.RESULTS: The alarm group had the highest average wear time. The control group had slightly lower average wear time than the alarm group, and the calendar group had the least amount of average wear time. There was a difference in average wear time between van Beek and expansion plate, with van Beek having a lower average wear time than expansion plate. Patients treated with expansion plates were more cooperative than patients treated with van Beek appliances. When data was tested for significance, no statistical significance was found.CONCLUSION: The study concludes that an alarm type of reminder appears to be better at improving wear time than a calendar or no reminder at all. This indicates that for future studies there might be a reason to develop a reminder for patients, for example an app. The study concludes that patients with expansion plates appear more cooperative than patients using van Beek appliance, so therefore focus should be on improving cooperation for patients using these types of appliances. This study shows that future studies should use one type of appliance, e.g. van Beek. More patients are needed in future studies to achieve statistical significant results.

published_or_final_version / Children's Dentistry and Orthodontics / Doctoral / Doctor of Philosophy

published_or_final_version / abstract / Electrical and Electronic Engineering / Master / Master of Philosophy

published_or_final_version / Chemistry / Master / Master of Philosophy

No description available.

by Chiu Kwok Chu Maurice. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1990. / Bibliography: leaves 56-56. / Contents / Chapter I. --- INTRODUCTION / Chapter II. --- FRAMEWORK OF ANALYSIS / Chapter II.1 --- Definition of the Organization Structure of Marketing / Chapter II.2 --- Roles of the Distributive System / Chapter a --- Economies of scale in determining the production of sales services / Chapter b --- Minimization of information cost in facilitating trade / Chapter (i) --- scope of enterprise and searching / Chapter (ii) --- price searching and bargaining / Chapter (iii) --- brand name and quality / Chapter (iv) --- advertising and externality / Chapter II.3 --- Factors Determining Vertical Integration / Chapter III. --- CASE STUDY / Chapter III.l --- A Short History of the Electric Appliances Retailing Business in Hong Kong / Chapter III.2 --- An Introduction to the Organization Structure of Marketing of Electric Appliances in Hong Kong / Chapter a --- Importer / Chapter b --- Wholesaler / Chapter c --- Retailer / Chapter III.3 --- Diversification of Retail Shops / Chapter a --- Differentiation of market / Chapter b --- Clustering of small retail shops / Chapter c --- Bargain-pricing / Chapter (i) --- The entrepreneurial salesmen / Chapter d --- Malpractice in retailing / Chapter e --- The emergence of non-bargain shops / Chapter (i) --- retailer's procurement prices / Chapter (ii) --- non-bargain shops reducing costs of searching and bargaining / Chapter IV. --- CONCLUSION / Appendix A: phone-order house / Appendix B / Bibliography

Digitized by Kansas Correctional Industries

No description available.