Effect of 5.25% Sodium Hypochlorite on Shear Bond Strength of Orthodontic Brackets Bonded with OBA-MCP

Open Journal of Orthopedics · 2025-01-01

Introduction: Bracket debonding is a frequent issue that clinicians encounter, leading to increased chair time, lost revenue, and material usage. In addition to patient compliance with their diet recommendations, the preparation and conditioning of teeth for bonding significantly influence bond strength and consequently impact orthodontic treatment success and efficiency. Because of OBA-MCP’s (orthodontic bonding adhesive with modified calcium phosphate) decreased shear bond strength (SBS), the purpose of this study was to evaluate the effects of conditioning with 5.25% sodium hypochlorite (NaOCl) before etching in the bonding protocol. Materials and Methods: 90 extracted teeth were divided into 3 groups to be bonded with orthodontic brackets with different bonding protocols: 1) Transbond XT with regular bonding protocol (etch + prime + adhesive); 2) OBA-MCP with regular bonding protocol; and 3) OBA-MCP with NaOCl prior to acid etching in the regular bonding protocol. SBS (in Newtons) were measured using an MTS universal testing machine with a custom jig to apply a vertical force onto the bracket and ARI (adhesive remnant index) scores were recorded for each sample after de-bond to rate the amount of adhesive remaining. Results: The addition of NaOCl to the bonding protocol statistically significantly increased the SBS of OBA-MCP to comparable levels to Transbond XT. The ARI scores showed that when NaOCl was added, more adhesive remained. Conclusion: The addition of NaOCl to the bonding protocol can increase the SBS of adhesives with historically weaker bond strengths. However, the increased amount of adhesive remaining and the increased time spent during bonding must be considered. Further testing can be done in vivo to demonstrate the practicality of this new procedure.

Root Resorption in Anterior Open Bite Malocclusions Due to Vertical Correction: A Radiometric Pilot Study

Open Journal of Orthopedics · 2023-01-01 · 1 citations

Introduction: One of the most common risks of fixed orthodontic therapy is the evidence of root resorption post orthodontic treatment ranging from mild root blunting to severe root resorption of significant portions of the root structure. The etiology of apical root resorption is multifactorial but largely depends upon the type of orthodontic tooth movement and treatment duration. Study Objective: The primary aim of this study is to examine the association of external apical root resorption and vertical correction in anterior open bite malocclusions using panoramic radiographs for evaluation. Materials and Methods: Pre-treatment and post-treatment panoramic radiographs of 16 patients with anterior open bite malocclusions were scored to assess root resorption of anterior teeth (U/L 3-3). Initial and final root length and total tooth length for U/L 3-3 were measured on panoramic radiographs in Dolphin imaging. Results: Of the 24 pairs of measurements, 7 had a significant p-value (p < 0.05). LR 3, LR 1. LL 1, LL 2, and LL 3 demonstrated root resorption post-orthodontic treatment. Conclusions: A statistically significant amount of root resorption was observed, from pre-treatment to post-treatment radiographs. All mandibular anterior teeth except the mandibular right lateral incisors showed evidence of root resorption.

Hyoid Bone Position as an Etiological Factor in Mandibular Divergence and Morphology

Open Journal of Orthopedics · 2022 · 3 citations

• Medicine
• Orthodontics
• Anatomy

Objectives: The objective is to determine whether there are differences in the position of the hyoid bone at rest in natural head position in subjects with mandibular hyperdivergence and to evaluate whether there are differences in hyoid position and antegonial notch depth in mandibular hyperdivergent males and females. Methods and Materials: This is a retrospective cohort study involving a review of lateral cephalometric radiographs of 45 adult men and women with mandibular hyperdivergency. Hyperdivergency was determined by cephalometric ranges of: SN-GoGn as least +2 SD from normal, Y-axis, PP-GoGN, and gonial angle greater than +1SD from normal. A group of 45 normodivergent adults served as a control, with cephalometric ranges of: SN-GoGn within ±1 SD of normal, with only one measurement of the other three between +1 and +1.5 standard deviations. A custom digital cephalometric analysis, the Hyoid Analysis, was designed, to measure the vertical and horizontal position and inclination of the hyoid and the antegonial notch depth. Results: In hyperdivergent subjects, the posterior aspect of the hyoid is located lower and more posterior, compared to the control group, while there is no difference in position of the anterior surface of the hyoid and the antegonial notch is 0.6 mm deeper. In males, the posterior aspect of hyoid is lower by 8.5 mm, while the anterior surface is located 9.0 mm lower. In males, the hyoid is inclined more steeply than in females by 4.4 degrees and the antegonial notch is deeper than in females by 0.6 mm. Conclusions: There are differences in hyoid bone position and mandibular morphology in hyperdivergent subjects compared to normodivergent subjects and in males compared to females.

A Comparison of Transverse Palatal Width in Adult Untreated Cleft Palate Patients with Normal Adult Palates: A Pilot Study

Open Journal of Orthopedics · 2021

• Medicine
• Dentistry
• Orthodontics

Objective: The purpose of this pilot study is to compare the transverse palatal widths in untreated adult cleft palate patients with normal adult patients. Methods and Materials: The study was conducted in Bangladesh recruiting 10 patients with adult sized untreated cleft palate and 15 patients with normal adult sized palates. The control group was comprised of 7 males and 8 females with a mean age of 30.5 ± 4.4 years. The affected group comprised of 7 males and 3 females with a mean age 17 ± 3.3 years. Alginate impressions of the maxillary arch were taken and poured into plaster dental casts. The inter-canine, inter-premolar and intermolar widths were measured to evaluate the maxillary growth pattern in patients with unoperated cleft palate. Due to the small sample size, both independent T-test and Mann Whitney non-parametric tests were performed to analyze the statistical significance of the data. Results: According to both the T-test and Mann Whitney non-parametric tests, the inter-premolar width including both the first and second premolars was statistically significantly smaller in the affected group with p values of 0.003 and 0.00 respectively. There was no significant difference in the inter-canine width between the affected and control group due to the variable canine position in cleft palate patients. Due to small sample size, no significant difference in the intermolar width between the affected and control group could be established. Conclusion: The interpremolar width is significantly smaller in patients with adult sized cleft palates than individuals with normal adult sized palates.

&lt;p&gt;Review of Etiology of Posterior Open Bite: Is There a Possible Genetic Cause?&lt;/p&gt;

Clinical Cosmetic and Investigational Dentistry · 2020 · 8 citations

• Medicine
• Bioinformatics
• Biology

Posterior open bite (POB) is one of the most severe malocclusions that can impair patients' masticatory functions, yet it is also a condition that is poorly understood and not well studied. Most reported cases are either sporadic or idiosyncratic with a diverse yet poorly understood etiology. Although primary failure of eruption (PFE), lateral tongue thrust, and certain medical syndromes or pathology of the temporomandibular joints have all been shown to cause POB, the complex interplay of environmental and genetic factors makes its etiopathogenesis a difficult subject to understand and investigate. Here, we provide a comprehensive review of the etiology of posterior open bite. Additionally, a genetic cause for POB is proposed through a report of an apparently non-syndromic familial case series with high POB penetrance across two generations. Further investigations of the gene(s) and mechanism(s) involved can not only provide a unique opportunity to better understand POB and the intricate muscular-occlusal relationship, but also offer powerful insight into the most effective approaches to clinical management of these (and potentially other) malocclusions.

Perceptions of chin asymmetries among dental professionals and laypersons

American Journal of Orthodontics and Dentofacial Orthopedics · 2018-07-31 · 28 citations

Another Look at Skeletal Maturation Using Hand Wrist and Cervical Vertebrae Evaluation

Open Journal of Orthopedics · 2018-01-01 · 5 citations

Introduction and Aims—The Growth stage of a patient can have considerable influence on diagnosis, treatment goals, timing and planning and the eventual outcome of orthodontic/orthopedic treatment. The purpose of this study was to analyze associations between the cervical vertebrae maturation score (CVMS) and skeletal maturation index (SMI). The second objective was to determine the reproducibility of the measurements on lateral cephalograms and hand-wrist radiographs. Materials and Methods—Lateral cephalometric and left hand-wrist radiographs of 92 untreated subjects (44 females and 48 males) aged from 8 to 17 years were obtained from the files of the Columbia University, Division of Orthodontics and measured for growth stage using cervical vertebrae and hand-wrist methods. Results—A high correlation was revealed between the hand-wrist and cervical vertebrae measurements. The Spearman’s rho correlation coefficient was 0.925 and significant at the 0.01 level. The correlation between hand-wrist and age (0.665, p Conclusions—The Fishman’s hand and wrist skeletal maturation index and Bacetti’s cervical vertebrae maturation stages are both useful tools in evaluating growth stages. Fishman’s hand-wrist method is slightly more accurate.

U.S. and Canadian Orthodontic Faculty Professional Satisfaction: A Survey Study

Journal of Dental Education · 2018-11-01 · 4 citations

The aims of this study were to evaluate U.S. and Canadian orthodontic faculty members' degree of job satisfaction and to assess the relationship between job satisfaction and factors such as full-time/part-time status, tenure status, age, and teaching training. This information is needed to set long-term goals for improving the recruitment and retention of full-time and part-time faculty. In August 2016, all members of the Council on Orthodontic Education Society of Educators and faculty members of the American Association of Orthodontists were invited via email to participate in a 34-question survey, which collected demographic data and asked respondents to report their degree of satisfaction on seven factors. Out of 645 individuals invited to participate, 133 completed all items on the survey (response rate 20.6%). The results showed that faculty time commitment, rank/position in the institution, and tenure status affected respondents' levels of satisfaction regarding quantity of clinical time, value placed on teaching by their institution and students, and leadership of their department chair. In the open-ended responses, increased compensation, more teaching time, and less administrative activity were the most frequent recommendations to improve satisfaction levels. About half (52%) of the respondents reported being satisfied with their financial compensation. Respondents whose institutions gave them training opportunities in teaching skills were 4.78 times more satisfied than those not given those opportunities. The results suggest that reduction of administrative workload, creation of meaningful faculty development programs, more feedback and sharing of information about requirements for promotion, and improvement of financial compensation could improve recruitment and retention of orthodontic educators.

Comparison of scanning times for different dental cast materials using an intraoral scanner

Journal of the World Federation of Orthodontists · 2017-03-01 · 11 citations

Orthodontics 2015: What's happening now?

American Journal of Orthodontics and Dentofacial Orthopedics · 2015-04-26