Orthodontics and Orthodontology Commons^™

A Comparative Analysis Of Intrusion Of Incisor Teeth Achieved In Adults And Children According To Facial Type, Ronald L. Otto

Loma Linda University Electronic Theses, Dissertations & Projects

A comparison of incisor intrusion achieved in deep bite adults and children was made. Facial type was also examined for affect upon intrusion achieved. Fifty-five cases treated with Bioprogressive mechanics were studied cephalometrically, including twenty-four adults and thirty-one children. Neither age nor facial type was found to be statistically related to the amount of incisor intrusion achieved in this sample. A method of measuring intrusion at the root apices was devised which was felt to give a more accurate indication of actual bodily intrusion. More external root changes during treatment were observed for adults than for growing children. Wide latitude …

Anterior Maxillary Soft And Hard Tissue Change : An Evaluation Of Orthodontic And Orthognathic Treatment Results, Joseph H. Elison

Loma Linda University Electronic Theses, Dissertations & Projects

Soft and hard tissue changes, in the nasolahial angle and the region of the upper lip, were compared in two modes of treating Class II, Division 1 maloclussion: 1) extraction of the upper first bicuspids and retraction of the anterior segment surgically by means of the Anterior Maxillary Osteotomy CAMO), 2) extraction of upper first bi cuspids and retraction of the anterior teeth by orthodontics alone. The first group consisted of twenty-five (25) patients; the second group consisted of thirty-six C36) patients.

Analysis of the resulting changes demonstrated the following:

With surgery ANS was retracted 2.52 mm, "A Point" was …

Fatigue Properties Of Orthodontic Wire, Kirkland B. Reuer

Loma Linda University Electronic Theses, Dissertations & Projects

Fracture of orthodontic appliances can be a problem because of the time involved to replace and repair them. It has been shown that most failures have been a result of fatigue fracture, i.e., failure resulting from cyclic loading.

The purpose of this study was to determine what effect variation of the type of orthodontic wire and heat treatment had on fatigue resistance. A device was constructed to put a cyclic load on a piece of wire until fracture. Two types of cobalt-chromium alloy wire (Blue and Green Elgiloy from Rocky Mountain Orthodontics) and three types of stain less steel wire …

A Cephalometric Evaluation Of The Dentofacial Changes Effected With Non-Extraction Treatment Utilizing Class Ii Intermaxillary Elastics, Sing Autrapiromsook

Loma Linda University Electronic Theses, Dissertations & Projects

The effects of Class II intermaxillary elastics were studied by means of serial cephalometric records on 24 Class II malocclusions. All of the cases were non-extraction and no headgear was employed. Lateral cephalometric radiographs were taken prior to, and immediately following, the removal of the elastics. The amount of normal, growth adjustments was considered in all measurements. Molar movement and anatomical plane changes were analyzed statistically. The Student t-test were used to evaluate the significant changes.

The following conclusions are based upon a statistical analysis of the observed changes:

1. The maxillary first molars did not move distally with respect to …

A Study Of Treatment And Cephalometric Variables In Relation To Facial Axis Change During Treatment In A Dolichofacial Sample, Laurence A. Seifert

Loma Linda University Electronic Theses, Dissertations & Projects

The change in the facial axis in a sample of fifth-three dolichofacial patients, was compared with a number of pretreatment cephalometric variables. A number of treatment variables were also compared with the amount of facial axis change that occurred during orthodontic treatment.

The cephalometric variables measured were:

1. Facial axis
2. Upper face height (maxillary height)
3. Lower face height
4. Posterior face height
5. Mandibular arc
6. Palatal-mandibular plane
7. Palatal-occlusal plane
8. Occlusal-mandibular plane
9. Overbite
10. Upper first molar to palatal plane
11. Lower first molar to mandibular plane
12. Lower incisor to mandibular plane
13. Incisal edge of lower incisor to mandibular plane
14. Xi point to occlusal plane

Treatment …

Cranio-Facial Skeletal Morphology Of Digit Suckers, John Eric Peterson Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this paper was to investigate the cranio-facial skeletal morphology found in digit suckers.

The criteria used for selecting the 50 patients in this study were a history of digit sucking and an anterior dental open-bite. The sample consisted of Class I and Class II, Division 1 malocclusions, ages six through adult, for both sexes. If an individual was post— pubertal, they were classified as an adult. A Ricketts lateral cephalometric analysis of each patient was compared to standards of the same age. These differences were analyzed statistically with a Student t test and a one-way analysis of …

Effects Of Heat Treatment On The Mechanical Properties Of Chromium-Cobalt Alloy Wire, Robert L. Nations

Loma Linda University Electronic Theses, Dissertations & Projects

Since virtually all stages of orthodontic treatment involve forces obtained from deformed metallic materials, an understanding of properties of metals is an important part of orthodontics. The use of chromium-cobalt alloy for arch wires is relatively new to the field, and more needs to be known about its use in order to get the most from this product.

Many clinicians feel that advantages can be gained through a low temperature heat-treatment to change certain mechanical properties of the material. A tensile test was chosen in the attempt to learn more about this alloy in the untreated form as well as …

A Clinical Method For Predicting Orthodontic Band Sizes, Robert P. Mohr

Loma Linda University Electronic Theses, Dissertations & Projects

A correlation was established among the orthodontic band sizes in a given individual. The original sample contained 258 data sets (Unitek Corp. band sizes from first molar through the first molar in both arches) which were computer analyzed. The maxillary right central incisor band size was selected as the "predictor size" for a band size prediction table developed from this study.

An additional 56 data sets were tabulated and became the test sample to test the accuracy of the band size prediction table. Band sizes of the test sample were predicted within ±1 band size 66% of the time and …

Tensile Properties Of Stainless Steel Orthodontic Wire, Elbert E. Jackson

Loma Linda University Electronic Theses, Dissertations & Projects

Ten types of .020 inch stainless steel wire were compared using a tensile test. The wires were tested in the as-received condition and after heat treatment at 750°F for eleven minutes. The data were then analyzed statistically using the general linear hypothesis.

In the as-received condition each of four mechanical properties--elastic modulus, 0.2 per cent yield strength, tensile strength, and percent elongation--was found to vary significantly from one type to another.

When subjected to heat treatment, the elastic modulus proved to be the most stable of the four properties, changing only slightly in three cases. There was no significant change …

The Stability Of Expanded Mandibular Canines, Premolars, And Molars Concomitant With Rapid Midpalatal Expansion, Ralph S. Kurti

Loma Linda University Electronic Theses, Dissertations & Projects

The view of not expanding mandibular canines to accommodate incisor crowding because of the fear of relapse of of the incisors has been generally accepted in orthodontics for many years. Most studies that have investigated expanded mandibular canine stability have concluded that they could not be permanently expanded to any degree. By adding another variable (rapid midpalatal expansion) to canine expansion it was thought that this might possibly increase canine expansion stability.

The purpose of this research was to determine if the stability of the expanded canines through 1st permanent molars was enhanced by concomitant rapid expansion of the midpalatal …

Angular Rotation Of Rectangular Wire In Rectangular Buccal Tubes, Eliezer Raphael

Master's Theses

No abstract provided.

The Effects Of Inducing Functional Class Iii Malocclusion On Actively Growing Rat Mandibles, Aarin Chu

Loma Linda University Electronic Theses, Dissertations & Projects

[Abstract Not Included]

The Effects Of Heavy Vs. Light Force Cervical Headgear, Kenneth Grant Corbett

Loma Linda University Electronic Theses, Dissertations & Projects

A sample of 27 cases treated with CHG were selected from the files of Rocky Mountain Data Systems, Inc. and Dr. B. Fletcher. The cases were divided into two groups according to forces used during treatment to initiate and continue distal molar movement. Group I consisted of 15.cases which had been treated by Dr. Ricketts using heavy cervical traction (250-500 grams); Group II included 12 cases which Dr. Fletcher had treated with very light cervical traction (120-240 grams).

The measurements of distal molar movement, facial axis and maxillary depth were recorded for each of the groups and t-tests were used …

Xeroradiography & Conventional Radiography : Comparative Imaging Of The Temporomandibular Joint, Nelson R. Gatov

Loma Linda University Electronic Theses, Dissertations & Projects

An investigation was conducted to evaluate the application of Xeroradiography for imaging the Temporomandibular Joint using the Updegrave and Weinberg positioning boards and to compare these images to those obtained by conventional radiography using the same positioning boards.

A cadaver head in which three spherical radiopaque implants had been placed was used in this study. A General Electric Model 1000 (Dental Unit) was the source of radiation. The conventional radiographs were produced on Dupont Cronex 2DC film and processed by a Phillips 810 automatic processed by a Xerox "125 System".

MAGNIFICATION

A comparison of the implant sphere diameters and the …

A Scanning Electron Microscope Study Of Fractured Orthodontic Wires, Dale G. Fessenden

Loma Linda University Electronic Theses, Dissertations & Projects

In the practice of orthodontics much time is spent each week replacing broken appliances. However, very little research has been done to study the cause of orthodontic wire failure. A few articles have reported the incidence of removable appliance failures but only one article has reported research concerning the failure of fixed appliance wires.

There has been much speculation concerning the contributing factors for premature wire failure. The concensus is that fatigue is a major factor in their fracture. There are three basic types of wire failure: ductile, fatigue, which ends in ductile rupture, and brittle failure. Ductile failure is …

Cephalometric Objectives For The Maxillary Central Incisor, John Mickey Damerell

Loma Linda University Electronic Theses, Dissertations & Projects

A cephalometric study was conducted to determine the ideal inclination of the maxillary central incisor for various facial patterns. Selected measurements were made on lateral headplate tracings of three samples: ideal, random and Class III malocclusions. Statistical analysis of data included means, standard deviations, simple correlations and stepwise regressions.

The Frankfort plane was found to be the most reliable reference plane when measuring the inclination of the maxillary central incisor. The maxillary central incisor inclination was found to be dependent upon the lower incisor position and inclination, chin position and the anterior cranial base inclination. A formula was produced to …

The Influence Of Pre-Loading On Stress Relaxation Of Orthodontic Elastic Polymers, James Young

Master's Theses

No abstract provided.

A Comparison Of Overbite Relapse To Age, Interincisal Angle And Lower Face Height In Class Ii Deepbite Cases, James E. Macalpine

Loma Linda University Electronic Theses, Dissertations & Projects

Patients with deep skeletal or dental bites before treatment have been noted to have a greater tendency towards relapsing to this deepbite following orthodontic treatment than do patients whose malocclusion showed a more ideal overbite relationship before treatment.

This study utilized patients selected from Rocky Mountain Data Systems for their deepbite trends. Three areas were compared to overbite relapse, 1) age, 2) interincisal angle 3) lower face height.

Results of this study indicate that overbite cases that have the most problems in retention were skeletal deepbites. This study also indicates that there was no disadvantage to early treatment, that the …

The Treatment Timing Of Dolicofacial, Retrognathic Facial Patterns, George B. Clarke Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

The general consensus among orthodontists today is that the dolicofacial, retrognathic patient can present one of the most challenging problems for conventional orthodontic therapy. It is often stated that many of these patients will have more mandibular opening rotation during orthodontic treatment than the mesofacial or brachyfacial patient. This opening rotation is compounded when the use of cervical traction and Class 11 mechanics are incorporated into the treatment plan. Because of the problems involved with the treatment of these types of patients, it has been suggested in the literature that there may be an ideal age to start orthodontic therapy …

The Prediction Of Circumferential Tooth Measurements As An Aid In Orthodontic Banding, Roland D. W. Neufeld

Loma Linda University Electronic Theses, Dissertations & Projects

A correlation was established among the circumferential measurements of the teeth in a given individual. The maxillary central incisor was selected as the predictor tooth to predict the remaining teeth in the set. The circumferences of the teeth were predicted within + two band sizes 69% of the time. Agreement in prediction percentages was found using measurements taken intraorally.

Soft Tissue Profile Prediction: An Evaluation Of Methods, Roger H. Zierenberg Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

Forty cases demonstrating at least 3 mm of lingual movement of the upper incisors were analyzed to determine the soft-tissue prediction accuracy of the Holdaway and the Ricketts methods. Initial analysis was performed by comparing predictions based on pre-treatment cephalometric tracings to post-treatment tracings. Lack of congruency was considered error and statistical analysis followed. The Ricketts method was shown to be superior for upper lip prediction on the combined 40 cases. Neither method proved superior in predicting the lower lip.

Further analysis involved segregating the cases according to individual functional lip abnormalities and again comparing the two methods for accuracy. …

Growth Augmentation With Activators, John R. Sibley

Loma Linda University Electronic Theses, Dissertations & Projects

This research was performed to determine if bony changes could be effected by activator treatment and how stable this treatment is.

From a sample of twenty-seven cases with before activator treatment cephalometric radiographs. Rocky Mountain Data Systems provided growth projections, with and without edgewise treatment, for the period of time each patient was in treatment. These forecasts were compared to the post-treatment cephalograms to analyze the orthopedic effects of activator treatment with normal growth and with edgewise therapy.

Nine of the twenty-seven case treated sample responded to recall for post-treatment cephalograms and were analyzed for relapse.

It was apparent that …

Space (1976), American Dental Association, American Society Of Dentistry For Children

Patient Dental Health Education Materials 1929-1981

No abstract provided.

A Computerized Study Of The Behavior Of The Facial Axis During Treatment And Post-Retention, Gary Cornforth

Loma Linda University Electronic Theses, Dissertations & Projects

A computerized cephalometric study of mandibular rotation was made of one hundred and eight patients that were treated by Drs. Ricketts and Bench of Pacific Palisades, California. These treated cases are on file at Rocky Mountain Data Systems in Sherman Oaks, California. The Ricketts computerized cephalometric analysis was utilized with each case.

Chin behavior during treatment and post-retention has always been of considerable interest to the clinical orthodontist and it was therefore decided to divide the patients into four groups according to the behavior of the chin during treatment and post-retention. Group 1 consisted of those patients that experienced a …

A Cephalometric Study Of Post-Retention Relapse In Mandibular Expansion Of Cuspids And Molars, Randall J. Schuler

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine if the advancements of cephalometrics and the capacity of the computer to quantify skeletal relationships could help the orthodontist recognize those cases where arch length could be gained through buccal expansion with little risk of relapse. To determine the stability of orthodontic treatment changes, the mandibular arches of 72 patients were studied. The cases were treated by Drs. Bench and Ricketts and were selected on the basis that each case must include three complete sets of frontal and lateral headplates, before and after treatment, and a minimum of two years out of …

An Evaluation Of A Precipitation Hardened Stainless Steel Alloy As An Alternate To Chrome Cobalt Alloys For Orthodontic Purposes, Joseph M. Caruso

Loma Linda University Electronic Theses, Dissertations & Projects

The intent of this paper was to evaluate a precipitation hardenable stainless steel (Alloy I) as an alternate to chromium cobalt alloys (Alloy II) for orthodontic purposes.

After evaluating several heat treatments of alloy I it was determined that solution treatment produced a wire that was soft initially and had similar properties found with alloy II. After solution treatment of alloy I a 330 gram load was required to deform the wire 1.0 mm which proved to be similar to the 295 gram force required for alloy II for the same deformation and only an 11% increase in resistance of …

A Correlation Study Of Selected Teeth By Circumferential Measurement, Steven W. Campbell

Loma Linda University Electronic Theses, Dissertations & Projects

A correlation was established among the circumferences of teeth in a given set. This is the first step in constructing a band numbering system so that the fitting of one band (the predictor tooth) would give you the band sizes for the remaining teeth in the set. This would make possible improved efficiency for the orthodontist during band selection.

Individual sets of teeth from impressions of patients starting orthodontic treatment were measured by the use of the dentometer. The upper second bicuspid was chosen as the predictor tooth after the correlation matrices were computed.

It was concluded that 48% of …

A Post-Retention Study Of The Stability Of Lower Incisors Evaluated Cephalometrically, Robert W. Allen

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine if forward movement of the lower incisor in a horizontal plane during active treatment affected the post-retention stability. The post-active treatment position of the lower incisor in relation to APo plane, NB plane and mandibular plane was also studied to determine if it affected the post-retention stability.

To determine where the lower incisors were moved during treatment, the beginning cephalometric tracings were superimposed over the end of active treatment tracings on the Corpus Axis at Supra-Pogonion. The amount of change in the incisal edge was measured to the nearest millimeter on a …

The Development Of A Means Of Applying Extraoral Pressure To The Buccal Arch Positioner, David C. Hobson

Loma Linda University Electronic Theses, Dissertations & Projects

A problem common to all of the full-banded orthodontic techniques currently in use is the delivery of an optimum force to each tooth without disrupting the forces on other teeth. This problem becomes especially acute during finishing. It arises out of Newton's third law, which states that for every action, there is an equal and opposite reaction. Thus, in full-banded techniques, a force on one tooth gives rise to generally undesirable reactive forces on other teeth in its vicinity.

The theory behind the buccal arch positioner (BAP) is dissipation of the force on any one tooth over every other tooth …

A Cephalometric Study Of Mandibulo-Facial Disostosis In Monozygotic Twins Using Computerized Methods, Lyn M. Lamberton

Loma Linda University Electronic Theses, Dissertations & Projects

An investigation using computerized cephalometrics has been conducted to consider the cephalometric factors responsible for the characteristic appearance evident in individuals afflicted with Mandibulo-Facial Dysostosis. A pair of Negro monozygotic affected twins were studied using the other 10 non-affected members of the family as a control to minimize the environmental and hereditary factors. The Rocky Mountain Data System was utilized to analyze the lateral and frontal cephalometric radiographs of each individual using Ricketts Analysis and the data were subjected to statistical tests to determine the factors contributory to the syndrome. Age and size were considered and adjustments were made to …