Orthodontics and Orthodontology Commons^™

A Modified Surgery-First Approach For Mandibular Prognathism With Proclined Maxillary Incisor And Mandibular Spacing, Jutharath Chanruangvanich, Ellen Wen-Ching Ko, Ying-An Chen

Taiwanese Journal of Orthodontics

This case report describes the management of an adult patient presenting with a skeletal Class III malocclusion, mandibular protrusion, upper incisor proclination and mandibular arch spacing by a modified surgery-first approach. A 26-year-old man had skeletal Class III and dental Class III malocclusion with concave facial profile, midface deficiency and mandibular prognathism with chin deviation to left. His dental manifestation presented anterior crossbite, upper incisors proclination and spacing in his mandibular arch. Treatment was performed with a modified surgery-first approach, which included a short presurgical alignment phase. In the maxilla, the significant maxillary crowding was relieved by 14 and 24 …

Orthodontic Treatment Of Class Ii Malocclusion With Single Maxillary Incisor, Chien-Cheng Chen, Yi-Horng Chen

Taiwanese Journal of Orthodontics

Orthodontic treatment of a Class II malocclusion case with single maxillary central incisor was presented in the case report. The treatment plan consisted of removing one maxillary central incisor instead of premolars. Bilateral maxillary lateral incisors were mesialized for space closure and substitution for maxillary central incisors. The morphology of maxillary lateral incisors was modified to mimic the maxillary central incisors. After treatment, both occlusion and esthetics was improved, and the patient was satisfied with the results.

A Comprehensive Diagnostic System For Orthodontists- Beyond Angle’S Classification, Ib Leth Nielsen

Taiwanese Journal of Orthodontics

Traditionally orthodontists have used the classification system developed by Edward H. Angle in 1900 to describe the malocclusion of an orthodontic patient. This classification is very limited with respect to the information it provides and should be replaced by a more detailed and inclusive description of a patient’s malocclusion as well as the underlying biology. In this review article we propose a new technique that ensures all pertinent information gets considered and we suggest a systematic approach to a more differentiated orthodontic diagnosis. Our approach divides the diagnosis into clearly defined categories that bring together the clinical findings into a …

Mandibular Molar Protraction For Edentulous Space Closure: A Systematic Review, Yueh-Tse Lee, Proudchompoo Paungmalit, Eric Jein-Wein Liou

Taiwanese Journal of Orthodontics

Objective: Orthodontic molar protraction into the edentulous space is a treatment option for patients with missing mandibular molars or premolars. Space closure by moving the molars mesially into edentulous ridge is difficult, especially in the mandible. This systematic review aimed to evaluate the dental and periodontal changes after mandibular molar protraction into an edentulous ridge. Material and Methods: Literature search was conducted using PubMed, Medline (Ovid), Cochrane Library, Web of Science, and Scopus until September 2019 limited to English publications. Specific inclusion and exclusion criteria were extracted and analyzed. Study quality was objectively assessed. Results: In total, 490 studies were …

Factors Influencing Fixed Orthodontic Treatmentoutcomes In A University Dental Clinic, Zhan Yan Fang, Sneha Ravindranath, Allan Pau

Taiwanese Journal of Orthodontics

Objective: To assess the orthodontic treatment outcomes in a university dental clinic and to determine factors associated with the treatment outcomes. Methods and materials: Firstly, the records of all patients who have completed fixed orthodontic treatment from 2012 to 2017 were identified and included in the study. Age at start of treatment, gender, decayed, missing filled teeth (DMFT), malocclusion classification, type of appliance used and type of treatment (extraction or non-extraction) were recorded. The pre-treatment and post-treatment study models were assessed by the Peer Assessment Rating (PAR) Index. The treatment outcomes were tabulated in a nomogram to show the proportions …

Management Of Congenital Missing In Bilateral Mandibular Incisors, Yun-Ting Huang, Chien-Wei Chao, Po-Yu Yang, Chia-Tze Kao

Taiwanese Journal of Orthodontics

This case report described the management of congenital missing bilateral mandibular central incisors in a 16 years-old female patient who was diagnosed as Angle’s Class I molar malocclusion, canine Class II relationship by a treatment plan of orthodontic space regain. The options of fixed bridge, removable partial denture or dental implants to replace the missing teeth were well explained to the patient by prosthodontic consultation. After the orthodontic alignment, the treatment results demonstrated that the initial profile of the patient was maintained, the missing teeth was later replaced by removable partial denture. The interdisciplinary therapy between orthodontics and prosthodontics should …

The Orthodontic Treatment Of Class Iii Malocclusion With Anterior Cross Bite And Severe Deep Bite, Chieh Yang, Yu-Chuan Tseng

Taiwanese Journal of Orthodontics

This 22-year-old female presents with skeletal Class III malocclusion, complicated by anterior cross bite, deep bite, and congenital missing of bilateral mandibular second premolars. The treatment modality was fullmouth fixed edgewise appliances. A favorable result of ideal overbite and overjet and closure of bilateral spaces of missing teeth were achieved. The patient was satisfied the improvement of function and esthetics after treatment.

Judged Facial Attractiveness Of Extraction And Non-Extraction Orthodontic Treatment In Repose And Smiling, Nicolette R. Chahin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background and Objectives: More so than ever, the public is becoming exceedingly aware of esthetics, and will evaluate their treatment outcome based upon the improvement to their smile and overall enhancement of their facial appearance. There exists a debate in orthodontics, as to whether or not extractions harm the profile. The aim of this study was to determine if facial attractiveness is harmed in subjects having completed orthodontic treatment involving the extraction of four premolars both in repose and smiling when viewed in lateral profile. Another objective is to identify any impact upper incisor retraction has on facial attractiveness. …

Comparison Of Patient Factors Influencing The Selection Of An Orthodontist, General Dentist, Or Direct-To-Consumer Aligners For Orthodontic Treatment, Jeffrey C. Olson

Theses and Dissertations

Purpose: To evaluate the factors that influence potential orthodontic patients choosing between an orthodontist, general dentist, and direct-to-consumer (DTC) aligners for their treatment, and to determine the demand for each provider type.

Methods: An electronic survey was administered to 250 individuals among the general population of adults in the United States. Questions were designed to determine the respondent’s level of interest in pursuing orthodontic treatment with each provider type, evaluate their current level of knowledge concerning provider options, and identify factors influencing their selection. Pearson’s chi-squared test and ANOVA were used to evaluate the factors influencing patients in …

Frictional Properties Of Novel Bracket Systems: An In-Vitro Study, Stephen M. Haverkos

Theses and Dissertations

Orthodontic brackets undergo resistance during sliding that includes classical friction, binding, and notching. Current bracket systems are hampered by these challenging forces. As a result, the clinician usually needs to apply additional forces to overcome the resistance which increases the risk of root resorption and discomfort for the patient. This study evaluated frictional properties of a novel bracket that had polytetrafluoroethylene (Teflon™) coated rollers in its design. Five types of brackets (n = 10, each), including a passive self-ligating bracket, a traditional ligated bracket, a three-dimensionally printed direct metal laser sintering (DMLS) bracket with and without Teflon™ rollers, and computer …

Let’S Face It: The Effect Of Orthognathic Surgery On Facial Recognition Algorithm Analysis, Carolyn Bradford Dragon

Theses and Dissertations

Aim: To evaluate the ability of a publicly available facial recognition application program interface (API) to calculate similarity scores for pre- and post-surgical photographs of patients undergoing orthognathic surgeries. Our primary objective was to identify which surgical procedure(s) had the greatest effect(s) on similarity score.

Methods: Standard treatment progress photographs for 25 retrospectively identified, orthodontic-orthognathic patients were analyzed using the API to calculate similarity scores between the pre- and post-surgical photographs. Photographs from two pre-surgical timepoints were compared as controls. Both relaxed and smiling photographs were included in the study to assess for the added impact of facial pose on …

The Efficacy Of A Fluoride-Containing Orthodontic Primer In Preventing Demineralization, Alyssa G. Ricci

Theses and Dissertations

Purpose: To evaluate the efficacy of a fluoride-containing orthodontic primer in preventing demineralization adjacent to brackets and compare the quality of enamel on tooth surfaces that received interproximal reduction (IPR).

Methods: Patients at the VCU Orthodontic clinic who consented to orthodontic treatment involving extraction of at least 2 premolars were recruited to this pilot clinical study. Brackets were bonded to premolars using one of two primers, fluoride-containing experimental or control. IPR was also performed, and the experimental primer was applied to randomly selected teeth. Extracted teeth were analyzed visually for the presence of white spot lesions (WSLs). Micro-CT analyses were …

Effects Of Class Ii Correctors And Functional Appliances On The Periodontal Health Of The Mandibular Incisors – A Prospective Cone-Beam Computed Tomography (Cbct) Study, David C. Duevel

Theses & Dissertations

The purpose of this investigation was to evaluate the effects of Class II correctors and functional appliances on the dentoalveolar support of the mandibular incisors during orthodontic treatment. Twenty six patients who were treated with a Forsus^TM, Herbst, or MARA participated this study. Lateral cephalometric radiographs, limited field-of-view CBCTs, and periodontal measurements were collected both the day of appliance activation and day of appliance deactivation. Ten hard tissue measurements on all four mandibular incisors were collected at each time point on CBCT images. Bone thickness increased at 6 and 9 mm apical from the cementoenamel junction (CEJ) on …

Changes In The Transverse Dimension Of The Nasomaxillary Complex Following Rapid Palatal Expansion – A Post-Retention, Cbct Evaluation, Allison Schubert

Theses & Dissertations

Purpose: The purpose of this investigation was to evaluate the immediate and long-term effects of palatal expansion on the transverse dimension of the nasomaxillary complex.

Materials and Methods: Twenty-eight patients’ CBCTs were obtained at four time points: pre-expansion (T₁), post-expansion (T₂), pre-treatment (T₃), and middle or end of orthodontic treatment (T₄). The patients’ age, sex, cervical vertebral maturation stage, and the number of instructed expander turns were recorded. Measurements of the nasal floor, nasal passage, maxillary sinus, maxillary first molar mesiolingual cusp, maxillary first molar palatal cusp, maxillary first molar buccal cortical …

Effect Of Centric Interference On Canine Tooth Wear, Andrey Gaiduchik

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The aim of this study was to determine the long term effect of a centric interference on canine tooth wear (CTW) and on centric occlusion (CO) and maximal intercuspation (MIP) variance. Materials and Methods: Thirty subjects, 11 males and 19 females, were selected based on inclusion and exclusion criteria. Changes in enamel volume were studied between the end of orthodontic treatment (T2) and at least seven years post treatment (T4). All models were scanned using a high resolution desktop scanner, (OrthoInsight 3D Scanner™, MotionView LLC). T4 models were articulated using a Panadent® Articulator and evaluated for dental interferences and …

Estimating Root Volumes By Limited Segmentation: A Volumetric Analysis Of Cbct And Micro-Ct Data, Theresa C. Baldwin

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: The increased dimensional accuracy of images provided by cone beam computed tomography (CBCT) scans allows for more in-depth diagnosis and treatment planning. Expedient interpolation of segmented data that provides clinically acceptable results will encourage clinicians to frequently use CBCT images for clinical/radiographic evaluation. Some of these applications include, quantification of root resorption, determination of force required for specific tooth movements, and customized appliances. Purpose: The study had two purposes. The first was to compare the accuracy of digital tooth volumes acquired from CBCT to the gold standard, micro-computed tomography (micro-CT). The second was to determine the effect of axial …

Measuring A Sample Of Orthodontic Models/Panographs At Llusd Using The Cr-Eval, Jonathan Michael Drew

Loma Linda University Electronic Theses, Dissertations & Projects

Introduction: An index must be used to quantify the improvement in the position of teeth treated by orthodontics. The Cast-Radiograph Evaluation is the index used by the American Board of Orthodontics. The purpose of this study is to use this index to evaluate treatment outcomes in the graduate orthodontic clinic at Loma Linda University from 2012-2016. Materials and Methods: Patients included were comprehensively treated, debonded between 1/1/2012 and 12/31/2016, and under age 30. A total of 80 patients were randomly selected, with 16 coming from each year. The ABO DI was used to score the T1 models, and the CR-Eval …

Reliability And Accuracy Of A Novel Photogrammetric Orthodontic Monitoring System, Vahe Ohanesian

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: This study quantitatively investigated the reliability and accuracy of Dental Monitoring’sTM proprietary orthodontic tracking system in comparison to an established reference. Materials and Methods: Intraoral scans (True Definition Scanner, 3MTM) and video scans (iPhone 7, AppleTM) were taken of 30 subjects undergoing comprehensive orthodontic treatment at Loma Linda University’s Graduate Orthodontic Clinic at T1 (initial) and T2 (3 months later). At each time point, an intraoral scan was taken by the operator followed by three video scans- two taken by the patient and one by the operator. Three linear and three angular measurements were analyzed using Dental Monitoring’sTM tracking …

A Retrospective Cephalometric Growth Study Of Sagittal Airway In Skeletal Class Ii Patients, Sue V. Kim

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The study retrospectively determined the average sagittal pharyngeal airway widths in Class II males and females between 7 to 16 years of age and changes in sagittal airway with increasing age. Additionally, this study determined whether average airway differs between gender at each age and compared the average airway widths in relation to increasing age between Class I and II patients. Materials and Methods: Longitudinal cephalograms were digitally traced for 38 untreated subjects (23 males, 15 females) from age 7 to 16 with skeletal and dental Class II patterns. These records were previously taken through growth studies conducted between …

Accuracy Of Cephalometric Analyses And Tooth Movements Of Conventional Vs Cbct-Generated Cephalograms, Thanh Khong Ng

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: The aim of this study was to compare Ricketts and American Board of Orthodontics (ABO) cephalometric measurements and tooth movements from tracings between conventional lateral cephalograms (Sirona Orthophos XG Plus, Charlotte, NC) and CBCT-generated cephalograms (NewTom 5G; QR srl, Verona, Italy). Materials and Methods: Patients who had bilateral Angle’s class II molar were evaluated. Pre-treatment (T1) and post-treatment (T2) conventional lateral cephalograms (CLCs) and CBCT-generated lateral cephalograms (CBLCs) were traced in Quick Ceph Studio using Ricketts and ABO cephalometric analyses. Linear and angular cephalometric measurements from tracings were compared between the two radiographic modalities using one-sample Wilcoxon signed rank …