Medicine and Health Sciences Commons^™

Moving An Incisor Across The Midline: A Treatment Alternative In An Adolescent Patient, Jose Bosio, T. Bradley, Arthur Hefti

T. Gerard Bradley

A 13-year-old sought treatment for a severely compromised maxillary left central incisor and an impacted fully developed left canine. Extraction of both teeth became necessary. As the key component of the revised comprehensive treatment plan, the right maxillary central incisor was moved into the position of the left central incisor. All other maxillary teeth were moved mesially to close any gaps. Active orthodontic treatment was completed after 34 months. Frenectomy, minor periodontal surgeries, and bonded lingual retainers were used to improve aesthetics and stabilize the tooth positions. The patient was pleased with the treatment outcome. Cone-beam computed tomography provided evidence …

An Investigation Into The Mechanical And Aesthetic Properties Of New Generation Coated Nickel-Titanium Wires In The As-Received State And After Clinical Use, T. Bradley, David Berzins, Nicholas Valeri, Jessica Pruszynski, Theodore Eliades, Christos Katsaros

T. Gerard Bradley

The orthodontic profession is constantly seeking to improve and optimize the aesthetics of orthodontic wires since the introduction of aesthetic brackets. Nickel-titanium (NiTi) wires since their introduction to orthodontics (Andreasen and Hilleman, 1971) have been extensively researched in vitro and are used as an initial levelling and aligning archwire because of its properties of springback and superelasticity (Burstone et al., 1985; Miura et al., 1986; Leu et al., 1990; Bishara et al., 1995; Bradley et al., 1996; Biermann et al., 2007; Berzins and Roberts 2010). Aesthetic wires are usually either coated NiTi wires or composite wires of reinforced polymers. Shape …

Enamel Colour Changes Following Whitening With 10 Percent Carbamide Peroxide: A Comparison Of Orthodontically‐Bonded/Debonded And Untreated Teeth, K. Hintz, T. Bradley, Theodore Eliades

T. Gerard Bradley

The purpose of this study was to determine if a colour difference exists between teeth that had orthodontic appliances bonded to and debonded from them and untreated controls subjected to whitening with 10 per cent carbamide peroxide. The sample consisted of 20 pairs of first and second premolars extracted for orthodontic reasons. The contralateral surfaces were divided into an experimental and control group. The experimental group underwent orthodontic bonding/debonding procedures. Both groups were subjected to 4 hour whitening and 20 hour hydration sessions for 30 days. The L*a*b*colour system was chosen to evaluate any colour change and these changes were …

Primary Language Spoken At Home And Children's Dental Service Utilization In The United States, Matthew Noyce, Aniko Szabo, Nicholas Pajewski, Scott Jackson, T. Bradley, Christopher Okunseri

T. Gerard Bradley

Objective: Language barriers have been well documented as a contributing factor to disparities in the receipt of medical services, especially for Hispanic children. However, there is a paucity of information on the effect of language barriers on children's dental service utilization. We examined the association of primary language spoken at home with the receipt of preventive and routine dental care for children in the United States. Methods: We analyzed data from the Medical Expenditure Panel Survey (2002-2004), which contains data on 21,049 children weighted to represent 75.8 million children nationally. Results: Among children aged 1-18 years, 13 percent spoke a …

Erosive Tooth Wear Among Children In The United States: Relationship To Race/Ethnicity And Obesity, Jesse Mcguire, Aniko Szabo, Scott Jackson, T. Bradley, Christopher Okunseri

T. Gerard Bradley

Objective.  The study aims were to estimate the prevalence of erosive tooth wear (ETW) in children and to specifically examine its association with race/ethnicity and obesity in the United States.

Design.  We analysed data from the National Health and Nutrition Examination Survey (NHANES), 2003–2004. ETW was measured using the modified Smith and Knight Tooth Wear Index derived from the 1998 United Kingdom Adult Health Survey.

Results.  This study shows that 45.9% of children aged 13–19 years had evidence of ETW in at least one tooth. The prevalence of ETW was bilaterally symmetrical in all teeth examined and was most prevalent …

Galvanic Corrosion Between Various Combinations Of Orthodontic Brackets And Archwires, Arash Bakhtari, T. Bradley, William Lobb, David Berzins

T. Gerard Bradley

Introduction: The purpose of this study was to compare galvanic currents generated by different combinations of commonly used brackets and archwires. Methods: As-received stainless steel, nickel-titanium, and betatitanium wires were coupled to stainless steel and titanium brackets in an artificial saliva medium. The galvanic current and amount of charge transferred for each pair were monitored with a zero resistance ammeter for 10 hours. Results: Two-way analysis of variance (ANOVA) showed a significant difference in charge and galvanic currents when factored for type of bracket (P\0.001), but no significant difference between them when factored by type of wire (P .0.05). Specifically, …

Differential Scanning Calorimetry (Dsc) Analyses Of Superelastic And Nonsuperelastic Nickel-Titanium Orthodontic Wires, T. Bradley, William Brantley, Bill Culbertson

T. Gerard Bradley

The purpose of this study was to determine the transformation temperatures for the austenitic, martensitic, and rhombohedral (R) structure phases in representative as-received commercial nitinol (NiTi) orthodontic wire alloys, to reconcile discrepancies among recent publications. Specimens were examined by differential scanning calorimetry (DSC) over a temperature range from approximately −170° C to 100° C, with a scanning rate of 10° C per minute. Two different pathways, with the intermediate R structure either absent or present, were observed for the transformation from martensitic to austenitic NiTi, whereas the reverse transformation from austenitic to martensitic NiTi always included the R structure. The …

Comparison Of Enamel Colour Changes Associated With Orthodontic Bonding Using Two Different Adhesives, Theodore Eliades, A. Kakaboura, George Eliades, T. Bradley

T. Gerard Bradley

The purpose of this study was to evaluate the enamel colour changes associated with bonding of brackets with a no-mix (one-phase) adhesive resin (Unite) and a glassionomer adhesive (GC Fuji Ortho). Thirty recently extracted premolars were used in the investigation. Black rectangular pieces of adhesive tape with a 3-mm diameter window were used to standardize the enamel surface intended for analysis. The teeth were divided into two groups of 15 teeth each, brackets (Starfire TMB) were bonded with the two adhesives, and the enamel surfaces were colourimetrically evaluated at three time intervals: (a) before bonding (baseline), (b) following debonding and …

Effect Of Various Curing Lights On The Degree Of Cure Of Orthodontic Adhesives, Markus Niepraschk, Christos Rahiotis, T. Bradley, Theodore Eliades, George Eliades

T. Gerard Bradley

Introduction: The purpose of this study was to compare the percentage degree of cure (%DC) of orthodontic adhesive resins irradiated with 3 types of light sources of various intensities: plasma arc, halogen, and light-emitting diode (LED). Methods: Twenty maxillary incisor stainless steel brackets (0.018-in slot) were divided into 4 groups of 5 brackets each. A standardized amount of composite resin was applied to each bracket base, simulating its clinical application. The brackets were light-cured with a halogen light for 20 seconds (10 seconds each from the incisal and cervical bracket edges), an LED light for 20 seconds (10 seconds per …

Surface Characterization Of Retrieved Niti Orthodontic Archwires, Theodore Eliades, George Eliades, A. Athanasiou, T. Bradley

T. Gerard Bradley

The structure and morphological condition of retrieved NiTi orthodontic archwires was evaluated and any possible alterations in the surface composition of the alloy following 1-6 months in vivo were characterized. NiTi wires (GAC, German Orthodontics, ORMCO) of various cross-sections were collected through a retrieval protocol and were subjected to multi-technique characterization. Optical microscopy revealed islands of amorphous precipitants and accumulated microcrystalline particles. Micro MIR-FTIR investigation of the retrieved samples demonstrated the presence of a proteinaceous biofilm, the organic constituents of which were mainly amide, alcohol, and carbonate. Scanning electron microscope and X-ray micro-analysis showed that the elemental species precipitated on …

Degree Of Cure Of Orthodontic Adhesives With Various Polymerization Initiation Modes, Theodore Eliades, George Eliades, T. Bradley, D. Watts

T. Gerard Bradley

The purpose of this study was to estimate the degree of cure (DC) of a light-cured, and a two- and a one-phase (no-mix) chemically-cured, as well as a dual-cured commercially available orthodontic adhesive resin. Forty stainless steel brackets were divided into four groups of 10 brackets each, and the bracket bases were covered with a standardized volume of adhesive. They were then pressed firmly onto a yellowish background surface of 75 per cent reflectance covered with cellulose film to facilitate detachment of the system and recovery of the set material. The visible light- and dual-cured adhesives were photopolymerized by irradiation …

Dimensional Changes Of Upper Airway After Rapid Maxillary Expansion: A Prospective Cone-Beam Computed Tomography Study, Yoon Chang, Lisa Koenig, Jessica Pruszynski, T. Bradley, Jose Bosio, Dawei Liu

T. Gerard Bradley

Introduction: The aim of this prospective study was to use cone-beam computed tomography to assess the dimensional changes of the upper airway in orthodontic patients with maxillary constriction treated by rapid maxillary expansion.

Methods: Fourteen orthodontic patients (mean age, 12.9 years; range, 9.7-16 years) were recruited. The patients with posterior crossbite and constricted maxilla were treated with rapid maxillary expansion as the initial part of their comprehensive orthodontic treatments. Before and after rapid maxillary expansion conebeam computed tomography scans were taken to measure the retropalatal and retroglossal airway changes in terms of volume, and sagittal and cross-sectional areas. The transverse …

Socio-Demographics Of Adult Orthodontic Visits In The United States, Joseph Whitesides, Nicholas Pajewski, T. Bradley, Anthony Iacopino, Christopher Okunseri

T. Gerard Bradley

Introduction: Population-based studies in orthodontics have focused on differences between normative and perceived needs. However, information from national data on the prevalence of orthodontic visits and their associated factors in adults in the United States is scarce. We examined the demographic profile of likely adult users of orthodontic services and whether there is racial and ethnic disparity in orthodontic visits. Methods: We analyzed data from the Medical Expenditure Panel Survey, 2000-2004. Results: Overall, about 1% of the population reported an orthodontic visit. Subjects who made a general dental visit during the current year were significantly more likely to also have …

Structural Conformation And Leaching From In Vitro Aged And Retrieved Invisalign Appliances, Susan Schuster, George Eliades, Spiros Zinelis, Theodore Eliades, T. Bradley

T. Gerard Bradley

The objectives of this study were to investigate the structure of Invisalign appliances (Align Technology, Santa Clara, Calif) after intraoral exposure, and to qualitatively and quantitatively characterize the substances leached from the aligners after accelerated in vitro aging. Samples of Invisalign appliances were randomly selected from 10 patients before intraoral placement and after retrieval, and the prepared specimens were subjected to (1) bright-field optical reflection microscopy to study the surface morphology; (2) Fourier transform infrared microspectroscopy to characterize the in vivo changes in molecular composition induced on appliance surfaces, (3) scanning electron microscopy and energy dispersive X-ray microanalysis to identify …