Orthodontics and Orthodontology Commons^™

Binding Of Salivary Proteins To Orthodontic Brackets, Maria Pia Canales

Electronic Thesis and Dissertation Repository

Objectives: The aim of this study was to investigate the effect of different orthodontic materials on the formation of the protein pellicle on the bracket surface.

Materials and Methods: We used X-ray Photoelectron Spectroscopy (XPS) to analyze the atomic composition of orthodontic metallic and ceramic brackets. Following XPS, the brackets were immersed in human whole saliva supernatant for 2-hour incubation at 37°C. Hydroxyapatite (HA) discs were used as control. Acquired pellicle was harvested with sonication for each group, and liquid chromatography electrospray ionisation mass spectrometry was used for protein identification.

Results: Differences reported by XPS and mass spectrometry were noted …

Comparison Of Tooth Length Measurements Made On Cbct And 3t Mr Images, Danielle A. Piano

Loma Linda University Electronic Theses, Dissertations & Projects

Objective: The aim of this study is to compare tooth length measurements made on cone beam computed tomography (CBCT) scans and 3-Tesla (3T) magnetic resonance (MR) scans. Materials and Methods: One CBCT scan (NewTom5G, AFP Imaging, USA) and one 3T MR scan (Siemens Medical Solutions, DE) as performed on 12 subjects. CBCT images were captured with an 18x16 inch field of view that covered the whole head. Contiguous sagittal MR images of the whole head were produced in a 3.0T imaging system with a T1-weighted 3D imaging sequence (Magnetization Prepared Rapid Acquisition by Gradient Echo (MP-RAGE), TP/TE = 1950/2.26 ms) …

Prediction Of Root Form Using Crown Data: Mandibular Left First Premolar, Matthew E. Durschlag

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The purpose of this study was to determine if a statistical shape model (SSM) of the lower left first premolar, consisting of both crown and root data, could adequately describe the root form from a surface scan consisting of only crown data. Secondly, it tested if there were any angles or measurements on the tooth crown that correlate with any aspects of root morphology. The average orthodontist practicing today or in the near future is likely to use or own a digital intraoral scanner in their office. Yet optical scans only allow visualization of the crowns of teeth and …

Factors Associated With Orthodontically Induced Apical Root Resorption Of Maxillary Incisors, Brandon Malan

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: Resorption of root apices is a ubiquitous occurrence in orthodontic treatment. Although most occurrence of resorption during orthodontic treatment is clinically inconsequential, a small percentage of patients have a severe amount of root structure that is lost. There are factors that are widely accepted as responsible for apical root resorption (RR), such as heavy compressive forces on the periodontal ligament (PDL). Unfortunately, it is still largely unpredictable if one patient will experience more root loss than what is considered normal. Thus, it is of clinical interest to further study what factors play a role in RR. Purpose: The purpose …

Effects Of Wire Material, Deflection, And Interbracket Distance On Burstone Bracket Geometry Force Systems, Skyler J. Liatti

Loma Linda University Electronic Theses, Dissertations & Projects

Objective. This paper aims to quantify the effect of wire material, dimension, and deflection on the most identifiable feature of the six-geometries: the moment dissociation point (force system with no moment on the lesser angled bracket), which may or may not occur at the classically defined geometry IV. Materials and Methods. A six-degree of freedom load cell was used to measure the force systems in different combinations of wire materials, wire dimensions, total angle of bracket, and interbracket distance. Brackets were progressively rotated through Burstone and Koenig’s six geometries and the moment on the right bracket was plotted against the …

Effects Of Palatal Expansion On Speech Production, Jason Milton Meinhardt

Master's Theses (2009 -)

Introduction: Rapid palatal expanders (RPEs) are a commonly used orthodontic adjunct for the treatment of posterior crossbites. RPEs are cemented to bilateral posterior teeth across the palate and thus may interfere with proper tongue movement and linguopalatal contact. The purpose of this study was to identify what specific role RPEs have on speech sound production for the child and early adolescent orthodontic patient. Materials and Methods: RPEs were treatment planned for patients seeking orthodontics at Marquette University. Speech recordings were made using a phonetically balanced reading passage (“The Caterpillar”) at 3 time points: 1) before RPE placement; 2) immediately after …

The Effect Of Heat Treatment On The Bending Properties Of A Cobalt-Chromium Orthodontic Wire, Alex Schwab

Master's Theses (2009 -)

Introduction: Elgiloy, a brand name of the original cobalt-chromium orthodontic wire, has been around for more than 50 years; yet despite this, little literature is available. Most of the literature on Elgiloy wires tends to evaluate the wires in tension. For these reasons, this study aimed to determine the bending properties of the four available tempers of Elgiloy wires and how heat treatment affects the wires’ bending properties. Materials and Methods: All four tempers of Elgiloy (red, yellow, green, and blue) were ordered in straight lengths containing 20 wires per pack that are each 0.018 inches in diameter and 14 …

Reliability Of Digital Dental Cast Measures As Compared To Cone-Beam Computed Tomography For Analyzing The Transverse Dimension, Brian Michel

Master's Theses (2009 -)

The purpose of this study was to assess the consistency in diagnosing the transverse dimension on cone-beam computed tomography (CBCT) images as compared to digital dental models. The study consisted of 11 patients with posterior crossbite at the level of the first molar and 17 patients with no crossbite at the level of the first molar. 13 patients were male and 15 patients were female with an overall mean age of 13.6 years. Eight linear measurements and two angular measurements were made on CBCT images of the patients and six linear measurements were made on the corresponding digital dental casts. …

Direct Visual Approximation Of Arch Length Discrepancy And Cephalometric Measurements, Bradley J. Wurm

Master's Theses (2009 -)

Introduction: Arch length discrepancy and cephalometric analysis are critical components of orthodontic treatment planning. Both have direct effects on the decision to extract teeth or not and treatment mechanics as well. Visual approximation is the most common method used to analyze arch length discrepancy among practitioners. Current trends show a decrease in the amount of orthodontists completing a cephalometric analysis. Previous studies have shown a tendency for orthodontists to overestimate the degree of crowding when visually approximating on dental casts. No previous study has assessed the ability to visually approximate cephalometric angle measurements. The purpose of this survey was to …

Thermal Properties Of Commonly Used Clear Aligner Systems As-Received And After Clinical Use, Louis Wenger

Master's Theses (2009 -)

Background/Objectives: The purpose of this study was to investigate the thermal properties, particularly glass transition temperature, of the polymers that are used to fabricate three different types of modern orthodontic aligners. Invisalign, (Align Technology, Inc, Santa Clara, CA, USA), Simpli5 (Allesee Orthodontic Appliances, Sturtevant, WI, USA), and ClearCorrect (ClearCorrect, Round Rock, TX, USA) were examined both as-received and after clinical use to determine if any differences were present both between and within aligners. Materials/Methods: Orthodontic aligners were collected from three different patients using the systems under investigation after two weeks of intraoral use. Duplicate, un-used samples were obtained from the …

A Retrospective Lateral Cephalometric Growth Study Of Sagittal Airway Changes, Grace H. Woo

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: This study retrospectively examined the average sagittal dimensions in the pharyngeal airway from skeletal and dental Class I males and females from 7 to 16 years of age utilizing longitudinal data from the American Association of Orthodontists Foundation Craniofacial Growth Legacy Collection. The study evaluated whether average sagittal airway dimensions differed between males and females at each age, and whether the sagittal airway dimension changed with increasing age. Materials and Methods: Sagittal airway dimension based on identifiable anatomical landmarks were digitally traced and measured from the longitudinal lateral cephalograms of 30 females and 32 males from the AAOF Growth …

Definitive Surgical-Orthodontic Treatment To Correct The Problems Subsequent To Early Skeletal Class Iii Camouflage, Siripatra Patchanee, Ellen Wen-Ching Ko, Cheng-Hui Lin

Taiwanese Journal of Orthodontics

This case report describes the treatment of a 21-year-old female patient who was disappointed with the outcome of a previous orthodontic treatment and complained about her chin prominent. She had skeletal Class III malocclusion with concave facial profile, hypodivergent facial pattern with deep overbite. The previous Class III camouflage orthodontic treatment was done by teeth 34, 44 extraction since she was 12 years old. With the concept of surgery-first approach, the surgical treatment plan included LeFort I osteotomy clockwise rotation of maxilla and bilateral sagittal split ramus osteotomy backward rotation of mandible with genioplasty and angle reduction in order to …

Solving The Complications Of Treating A Unilateral Submerged And Ankylosed Maxillary Permanent First Molar – A Case Report, Han-Wen Yang, Hsin-Yi Lo, Kwong-Wa Li, Liang-Ru Chen

Taiwanese Journal of Orthodontics

The study reported an adult orthodontic case with a unilateral ankylosed upper permanent first molar. A number of complications occurred, including occlusal plane canting, dental midline deviation and asymmetric molar relationship. The case demonstrated the mechanics used to solve all the complications we met. The case also showed the phenomenon that after extraction of the ankylosed tooth, the bone remodeling mechanism of the bone in situ seemed abnormal and resulted in difficulty of protracting the tooth into the extracted site. All the above reasons, therefore, resulted in prolonged treatment time. In addition, the case also demonstrated the method we used …

Investigation Of Medical Disputes Involving Dentists Performing Orthodontic Treatments In Taiwan, Chih-Ling Lin, Sheng-Pin Hsu, Yu-Kun Chih

Taiwanese Journal of Orthodontics

Introduction: Medical disputes have received increasing attention in recent years. Under the assistance of the academic and medical affairs committees of the Taiwan Association of Orthodontists, this study explored medical disputes among orthodontists performing orthodontic treatments in Taiwan in 2016. Methods: This study adopted a questionnaire survey, which was divided into three sections, namely the surveyed orthodontists’ demographic information, medical services, and subjective views on orthodontic-related medical disputes. The results were compared with those from a study conducted in 2010. Subsequently, topics related to clear aligner therapy and orthognathic surgery were examined. Results: The results indicated that 32.3% of the …

Molar Distalization By Temporary Anchorage Devices (Tad S) – A Review Article, Jun Ming Tan, Yi-Min Liu, Hung-Cheng Chiu, Yi-Jane Chen

Taiwanese Journal of Orthodontics

Clinically, there are many ways to achieve molar distalization, such as skeletal anchorage, extraoral anchorage, sliding jig, lip bumper, and pendulum, etc. Although several methods have been described to distalize molars or total dentition, there is no strong scientific evidence of the effectiveness of various methods. To date, temporary anchorage devices (TADs) are increasingly used as orthodontic anchorage sources because of its strong anchorage, including endoosseous implants, miniplates, miniscrews and microscrews. Application of bony anchorage makes teeth move more efficiently, without depending on patient compliance in wearing appliance. However, only case reports and small case series have been published on …

Comparison Of Intraoral And Extraoral Scanners On The Accuracy Of Digital Model Articulation, Jason L. Porter

Theses and Dissertations

Introduction: Orthodontists increasingly rely on digital models in clinical practice. The ability of modern scanners to articulate digital models must be scientifically evaluated. Methods:Twenty five digital articulated models were produced from four digital scanners in five experimental groups. The resulting inter-arch measurements were compared to the gold standard. An acceptable range of 0.5mm more or less than the gold standard was used for evaluation. Results: iTero® and iTero® Element yielded all acceptable inter-arch measurements. The 3M™ True Definition and Ortho Insight 3D® with Regisil® bite registration produced four of six acceptable inter-arch measurements. The Ortho Insight 3D® with Coprwax ™ …

Camouflage Orthodontic Treatment For Adultpatient With Skeletal Class Iii Malocclusion And Bilateral Posterior Cross-Bite, Rouh-Hwai Wang, Hsin-Lan Shen

Taiwanese Journal of Orthodontics

This 23-year-old female presents with skeletal Class III malocclusion, complicated by prominent chin projection, bilateral posterior lingual cross-bite, missing of bilateral maxillary first molars, and severely lingualtilted lower second molars. The treatment modality was conventional edgewise appliance with bilateral lower first premolar extraction. A favorable result of ideal overbite and overjet and correction of bilateral posterior cross-bite were achieved. The patient was satisfied the improvement of function and esthetics after treatment.

Non-Surgical Treatment Of An Adult Class Iii Malocclusion Patient With Facial Asymmetry By Unilateral Mandibular Arch Distalization, Chi-Yu Tsai, Shiu-Shiung Lin, Yi-Hao Lee, Li-Tyng Sun, Yu-Jen Chang, Te-Ju Wu

Taiwanese Journal of Orthodontics

This article reports the treatment of a 22-year-old male with Class III malocclusion and facial asymmetry by non-surgical camouflage orthodontic approach. This patient presented with anterior crossbite and deviated midline, mild protrusive mandible and chin deviation. The Class III malocclusion was marked with anterior functional shift resulted from the premature contact of the incisors. Unilateral mandibular buccal shelf miniscrew was applied for the correction of the skewed mandibular arch. After treatment, the deviated dental midline and Class III molar relation were both corrected. This patient exhibited harmonious profile and occlusion.

Dental Pulp Response To Orthodontic Tooth Movement, Chih-Wei Wang, Kai-Long Wang, Kwok-Hing Ho, Shun-Chu Hsieh, Heng-Ming Chang

Taiwanese Journal of Orthodontics

Pulp vitality may occasionally change while tooth experiencing orthodontic movement, and orthodontists are the particular group who concern this phenomenon if it happens. The respiration rate of dental pulp will be depressed inevitably in short term when tooth is subject to orthodontic force. If force level is extreme, circulatory interruption can occur and further induce pulp necrosis. When orthodontic movement on pulpalcompromised teeth (e.g. teeth with trauma history or large restorations) is required, the pulp response to orthodontic force should be monitored. This article provides an overall review on the pulpal reactions during orthodontic movement and dental movement on teeth …

Surgical-Orthodontic Treatment With Molar Protraction In A Patient With Skeletal Class Iii Anterior Open Bite And Facial Asymmetry, Yi-Hsuan Chen, Cheng-Hui Lin, Ellen Wen-Ching Ko

Taiwanese Journal of Orthodontics

A 20-year-old young male complained of his protrusive and deviated chin. He also presented occlusal plane cant, anterior open bite and unrestorable maxillary right first molar and mandibular left first molar. The severe maxilla-mandibular discrepancy was solved with surgery-first double jaw orthognathic surgery. The space of two extracted first molars was closed by protraction of the second and third molars after surgery. Two protraction techniques were used in this case, including closing maxillary right first molar space with reciprocal retraction, and closing mandibular left first molar with one miniscrew as an absolute anchorage. Careful biomechanical consideration was used during protraction …