scholarly journals Variation of Static Frictional Forces in the Fixed Orthodontic System

2019 ◽  
Vol 70 (11) ◽  
pp. 3954-3956
Author(s):  
Anca Oana Dragomirescu ◽  
Elina Teodorescu ◽  
Viorica Tarmure ◽  
Andreea Baluta ◽  
Mariana Pacurar ◽  
...  
Keyword(s):  
Frictional Force ◽  
Orthodontic Treatment ◽  
Testing Machine ◽  
Orthodontic Appliances ◽  
Aesthetic Appearance ◽  
Fixed Orthodontic Appliances ◽  
Different Types ◽  
Frictional Forces ◽  
Epoxy Resin Coating ◽  
The Aesthetic

Currently, the aesthetic appearance of fixed orthodontic appliances is an important factor for patients seeking orthodontic treatment. The aim of this study was to evaluate static frictional forces generated by different types of round 0.016 NiTi archwires, with and without aesthetic coating, when coupled with monocrystalline alumina brackets. The static frictional force was determined using a testing machine for measuring compression and tension forces. The results showed a variation of static frictional forces depending on the type of archwire used. Uncoated archwires have produced the lowest static frictional forces. Partially aesthetic coated archwires have generated lower static frictional forces than fully aesthetic coated ones. Fully aesthetic coated archwires have produced the highest static frictional forces, but no significant differences were noted between archwires with polymer and epoxy resin coating.

scholarly journals Variation of Static Frictional Forces in the Fixed Orthodontic System

2019 ◽  
Vol 70 (11) ◽  
pp. 3954-3956
Author(s):  
Anca Oana Dragomirescu ◽  
Elina Teodorescu ◽  
Viorica Tarmure ◽  
Andreea Baluta ◽  
Mariana Pacurar ◽  
...  
Keyword(s):  
Frictional Force ◽  
Orthodontic Treatment ◽  
Testing Machine ◽  
Orthodontic Appliances ◽  
Aesthetic Appearance ◽  
Fixed Orthodontic Appliances ◽  
Different Types ◽  
Frictional Forces ◽  
Epoxy Resin Coating ◽  
The Aesthetic

Currently, the aesthetic appearance of fixed orthodontic appliances is an important factor for patients seeking orthodontic treatment. The aim of this study was to evaluate static frictional forces generated by different types of round 0.016` NiTi archwires, with and without aesthetic coating, when coupled with monocrystalline alumina brackets. The static frictional force was determined using a testing machine for measuring compression and tension forces. The results showed a variation of static frictional forces depending on the type of archwire used. Uncoated archwires have produced the lowest static frictional forces. Partially aesthetic coated archwires have generated lower static frictional forces than fully aesthetic coated ones. Fully aesthetic coated archwires have produced the highest static frictional forces, but no significant differences were noted between archwires with polymer and epoxy resin coating.

scholarly journals Photogrammetric analysis of postextraction space closure

2021 ◽  
Vol 68 (2) ◽  
pp. 59-67
Author(s):  
Mirjana Umicevic-Davidovic ◽  
Marijana Arapovic-Savic ◽  
Adriana Arbutina ◽  
Tijana Adamovic ◽  
Igor Djukic
Keyword(s):  
Orthodontic Treatment ◽  
Treatment Plan ◽  
Total Sample ◽  
Orthodontic Appliances ◽  
Results Of Treatment ◽  
Aesthetic Appearance ◽  
Space Closure ◽  
Fixed Orthodontic Appliances ◽  
The Difference ◽  
Digital Caliper

Introduction. When planning orthodontic treatment, it is sometimes necessary to apply the extraction of individual teeth, in order to achieve proper occlusion and an acceptable aesthetic appearance. Clinicians give the greatest advantage to elastic chains as a method for post-extraction space closure during treatment with fixed orthodontic appliances. When closing post-extraction spaces, it is necessary to measure them in order to adjust the treatment plan. One of the most acceptable methods is photogrammetry. The aim of this study was to analyze, using a photogrammetric method, the efficacy of post-extraction space closure with elastic chains during orthodontic treatment with fixed orthodontic appliances. Material and Methods. The total sample in study consisted of 38 post-extraction spaces in 19 patients who were indicated for first premolars extraction and use of fixed orthodontic appliances in order to achieve treatment goal. Elastic chains were used to close post-extraction spaces. Post-extraction sites were monitored for 6 months with follow-up examinations every 4 weeks. Mechanisms were activated at controlled examinations, and measurements of the width of post-extraction spaces were performed by photogrammetry and digital caliper. Results. The results showed that average reduction of post-extraction space width was 1.00 mm per month by photogrammetric measurement, while the average values of measurements with a digital caliper were 1.02 mm. The average values were measured in six time intervals and a statistically significant change in average intervals of post-extraction spaces during 6 months was determined. Conclusion. The elastic chain has proven to be a very effective mechanism for closing post-extraction space, and photogrammetry as a simple and precise method for monitoring results of treatment. Since the difference in relation to measurements with a digital caliper is minimal, photogrammetry can be routinely applied in everyday practice.

scholarly journals Effect of fixed orthodontic appliances on nonmicrobial salivary parameters

2018 ◽  
Vol 88 (6) ◽  
pp. 806-811 ◽  
Author(s):  
Ioannis P. Zogakis ◽  
Erez Koren ◽  
Shlomit Gorelik ◽  
Isaac Ginsburg ◽  
Miriam Shalish
Keyword(s):  
Orthodontic Treatment ◽  
Statistical Significance ◽  
Orthodontic Appliances ◽  
Inclusion Criteria ◽  
Reactive Protein ◽  
Fixed Orthodontic Appliances ◽  
Salivary Ph ◽  
Orthodontic Patients ◽  
The Difference ◽  
Ph Decrease

ABSTRACT Objectives: To examine possible changes in the levels of salivary antioxidants, C-reactive protein (CRP), cortisol, pH, proteins, and blood in patients treated with fixed orthodontic appliances. Materials and Methods: Salivary samples from 21 orthodontic patients who met specific inclusion criteria were collected before the beginning of orthodontic treatment (T0; baseline), 1 hour after bonding (T1), and 4–6 weeks after bonding (T2). Oxidant-scavenging ability (OSA) was quantified using a luminol-dependent chemiluminescence assay. Cortisol and CRP levels were measured using immunoassay kits. pH levels and presence of proteins and blood in the samples were quantified using strip-based tests. Results: A significant decrease in salivary pH was observed after bonding (P = .013). An increase in oxidant-scavenging abilities during orthodontic treatment was detected, but the change was not statistically significant. Cortisol and CRP levels slightly increased after bonding, but the difference was small without statistical significance. Changes in the presence of proteins and blood were also insignificant. Conclusions: Exposure to fixed orthodontic appliances did not show a significant effect on salivary parameters related to inflammation or stress, with the exception of a significant but transient pH decrease after bonding.

Salivary Sodium and Potassium Concentrations in Patients with Fixed Orthodontic Appliances

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Mahsa Esfehani ◽  
Bahareh Mohammad Zahraiee ◽  
Sepideh Arab ◽  
Fatemeh Hajmanoochehri ◽  
Mohammadtaghi Vatandoust
Keyword(s):  
Orthodontic Treatment ◽  
Sodium Concentration ◽  
Control Group ◽  
P Value ◽  
Case Group ◽  
Orthodontic Appliances ◽  
Potassium Ions ◽  
Fixed Orthodontic Appliances ◽  
Sodium And Potassium ◽  
Control Study

Objectives: This study was aimed to assess salivary sodium and potassium concentrations in patients with fixed orthodontic appliances. Methods: In this case-control study, saliva samples (5 cc) were collected from 13 patients with fixed orthodontic appliances before, and 1 week, 1 month and 3 months after the beginning of the orthodontic treatment using the spitting method. Saliva samples were also collected from 10 healthy individuals as controls. The saliva samples were centrifuged at 3000 rpm for 10 minutes and the salivary sodium and potassium concentrations were measured by spectrophotometry. Data were analyzed using independent and paired t-tests. P-value < 0.05 was considered as significant. Results: The salivary sodium and potassium concentrations were almost the same in both groups at baseline (P > 0.05). A significant reduction in sodium and an increase in potassium levels were noted in the case group at 1 week compared with baseline (P < 0.001). At 1 week, the potassium concentration was significantly higher and the sodium concentration was significantly lower in the case group (P < 0.01). The salivary sodium significantly increased while the salivary potassium significantly decreased at 1 month compared with 1 week (P < 0.001). The differences with the control group were also significant (P < 0.05). No significant differences were noted between the two groups at 3 months (P > 0.05). Conclusions: Time has a significant effect on the release profile of sodium and potassium ions from orthodontic appliances. The salivary sodium and potassium concentrations returned to their normal pretreatment values within 3 months after the start of fixed orthodontic treatment.

scholarly journals Relationship between orthodontic treatment and gingival health: A retrospective study

2014 ◽  
Vol 08 (03) ◽  
pp. 373-380 ◽  
Author(s):  
Fatma Boke ◽  
Cagri Gazioglu ◽  
Sevil Akkaya ◽  
Murat Akkaya
Keyword(s):  
Retrospective Study ◽  
Orthodontic Treatment ◽  
Gingival Recession ◽  
Orthodontic Appliances ◽  
Lower Incisor ◽  
Gingival Health ◽  
Fixed Orthodontic Appliances ◽  
Significant Difference ◽  
Before And After ◽  
The Relationship

ABSTRACT Objective: The aim of this retrospective study was to evaluate the relationship between orthodontic treatment and gingival health. Materials and Methods: A total of 251 patients among whom 177 were girls and 74 were boys, recruited from the records pool of the Department of Orthodontics, Faculty of Dentistry, University of Gazi, were included in the study. Patients’ treatments have been completed by postgraduate students during the period between 2006 and 2012. Patients’ folders were analyzed according to their age, treatment time, and the type of orthodontic treatment. Intra-oral photographs were analyzed, and the presence or absence of visible plaque, visible inflammation, and gingival recession were recorded, and incisor inclinations analyzed on lateral cephalometric films, before and after orthodontic treatment. Results: No statistically significant difference was found in patients treated with functional appliances before and after treatment. In patients treated with fixed orthodontic appliances, visible plaque, visible inflammation, and gingival recession showed significant increases after treatment, gingival biotype did not show any significant difference. Positive correlation was found between lower incisor position and gingival recession in patients treated with fixed appliance and extraction. And also cuspids were the teeth with the highest prevalence of gingival recession. Conclusion: Considering the relationship between orthodontic treatment and gingival health, cooperation among patients, orthodontists, and periodontists is important.

scholarly journals Effect of Fixed Orthodontic Treatment on Salivary Nickel and Chromium Levels: A Systematic Review and Meta-Analysis of Observational Studies

2019 ◽  
Vol 7 (1) ◽  
pp. 21 ◽  
Author(s):  
Mohammad Imani ◽  
Hamid Mozaffari ◽  
Mazaher Ramezani ◽  
Masoud Sadeghi
Keyword(s):  
Orthodontic Treatment ◽  
Randomized Clinical Trials ◽  
Meta Analysis ◽  
Random Effect ◽  
Cochrane Library ◽  
Orthodontic Appliances ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Number Of Patients ◽  
Fixed Orthodontic Appliances

Nickel and chromium ions released from fixed orthodontic appliances may act as allergens. This study aimed to systematically review the effect of fixed orthodontic treatment on salivary levels of these ions by doing a meta-analysis on cross-sectional and cohort studies. The Web of Science, Scopus, Cochrane Library, and PubMed databases were searched for articles on salivary profile of nickel or chromium in patients under fixed orthodontic treatment published from January 1983 to October 2017. A random-effect meta-analysis was done using Review Manager 5.3 to calculate mean difference (MD) and 95% confidence interval (CI), and the quality of questionnaire was evaluated by the Newcastle–Ottawa scale. Fourteen studies were included and analyzed in this meta-analysis. Salivary nickel level was higher in periods of 10 min or less (MD = −11.5 µg/L, 95% CI = −16.92 to −6.07; P < 0.0001) and one day (MD = −1.38 µg/L, 95% CI = −1.97 to −0.80; P < 0.00001) after initiation of treatment compared to baseline (before the insertion of appliance). Salivary chromium level was higher in periods of one day (MD = −6.25 µg/L, 95% CI = −12.00 to −0.49; P = 0.03) and one week (MD = −2.07 µg/L, 95% CI = −3.88 to −0.26; P = 0.03) after the initiation of treatment compared to baseline. Corrosion of fixed orthodontic appliances leads to elevated salivary nickel and chromium concentrations early after initiation of orthodontic treatment. Randomized clinical trials controlling for factors affecting the saliva composition are recommended on a higher number of patients and among different ethnicities.

scholarly journals Essential Attributes of Clear Aligner Therapy in terms of Appliance Configuration, Hygiene, and Pain Levels during the Pandemic: A Brief Review

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Anand Marya ◽  
Adith Venugopal ◽  
Nikhilesh Vaid ◽  
Mohammad Khursheed Alam ◽  
Mohmed Isaqali Karobari
Keyword(s):  
Side Effects ◽  
Orthodontic Treatment ◽  
Orthodontic Appliances ◽  
Careful Evaluation ◽  
Long Period ◽  
Fixed Orthodontic Appliances ◽  
Clear Aligner

Fixed orthodontic treatment has been compromised at many levels during the pandemic period, as clinics underwent a prolonged lockdown and patients could not be treated regularly. With the end of the pandemic nowhere in sight, may be it is time to put newer tools, such as clear aligner therapy, for better use. Fixed orthodontic appliances by nature are not always self-limiting, which, if left unmonitored over a long period may cause undesirable side effects, pain, and discomfort. The undesired tooth movements that may occur with arch wire-guided mechanics in addition to problems with cut wires or removed brackets may be minimized with the use of aligners. While the benefits of using aligners are for all to see, they do require extensive planning and careful evaluation of the progress. This article reviews the advantages of using aligners during the pandemic period and how it can be beneficial in helping orthodontists resume their practice.

Effective multidisciplinary approach for treatment of traumatized maxillary incisors and hypodontia

2020 ◽  
Vol 13 (1) ◽  
pp. 6-9 ◽  
Author(s):  
Mustafa Elhussein ◽  
Jonathan J O'Dwyer ◽  
Jonathan Sandler
Keyword(s):  
Case Report ◽  
Multidisciplinary Team ◽  
Alveolar Bone ◽  
Treatment Modalities ◽  
Orthodontic Appliances ◽  
Team Approach ◽  
Missing Teeth ◽  
Multidisciplinary Team Approach ◽  
Fixed Orthodontic Appliances ◽  
The Aesthetic

Fractured and missing teeth within the aesthetic zone have always posed a clinical challenge for the dental team. Management and treatment requires the input from a number of dental specialists to guarantee a high quality result. A case report is presented to demonstrate an effective combined orthodontic/restorative approach that fully restored aesthetics and function. The report is of a 14-year-old girl who traumatized her maxillary central incisors, in a dentition that was already compromised as she had congenital absence of her maxillary left lateral incisor. Using fixed orthodontic appliances, the fractured teeth were extruded to bring the fracture line above the level of the alveolar bone. This movement allowed an immediate aesthetic improvement, using stainless steel prefabricated posts and composite resin buildups, which also facilitated further orthodontic tooth movement. Teeth, that would otherwise have been extracted, were salvaged and, utilizing a multidisciplinary team approach, a reasonable long-term prognosis has resulted. CPD/Clinical Relevance: This case report aims to demonstrate how a multidisciplinary team approach in Orthodontics can be utilized for management of severely handicapped dentitions that have sustained dental injury. It is not the aim of this case report to discuss the treatment of dental injuries but to demonstrate and provide an overview of the possible treatment modalities that can be effective in restoring function and aesthetics, with special consideration given to missing teeth and subgingival crown fractures within the aesthetic zone.

scholarly journals An In Vitro Evaluation of Frictional Characteristics of Labial and Lingual Self-ligating Brackets with Various Archwire Alloys

2020 ◽  
Vol 54 (3) ◽  
pp. 203-213
Author(s):  
Subrat Kumar Sahany ◽  
G. Sreejith Kumar
Keyword(s):  
Stainless Steel ◽  
Frictional Force ◽  
Testing Machine ◽  
In Vitro Study ◽  
Fixed Appliance ◽  
Conventional Brackets ◽  
Frictional Forces ◽  
Dry And Wet Conditions ◽  
Lingual Brackets

Background: An understanding of bracket slot–archwire interface is imperative for biomechanical effectiveness in orthodontic sliding mechanics and hence the aim of the study is to evaluate frictional properties of lingual self-ligating brackets comparing with conventional lingual and labial self-ligating brackets using three different archwire alloys in various environments. Materials and Methods: This in vitro study compared the frictional force of labial and lingual self-ligating and conventional lingual brackets with stainless steel, TMA, and Cr-Co alloy archwires of 0.017” × 0.025” dimension in dry and wet conditions. Frictional forces were evaluated in a simulated half arch fixed appliance using a testing machine. Static and kinetic friction were measured and analyzed by one-way analysis of variance (ANNOVA) test and post hoc Duncan multiple range test. The effects of brackets and archwires in dry and wet conditions were analyzed by three-way variance (ANNOVA) test. Result: The maximum frictional forces were observed with labial self-ligating brackets followed by lingual conventional brackets and the least by lingual self-ligating brackets. Of all the wires tested, TMA wires had the maximum frictional forces followed by Co-Cr and stainless steel. In both conditions, the values were non-significant with all bracket–wire combinations except with Co-Cr and TMA wires. Conclusions: Varied amount of frictional force was shown by the brackets and wires with highest by labial self-ligating bracket, followed by lingual conventional and lingual self-ligating brackets. TMA wires experienced higher friction followed by Co-Cr and stainless steel with minimum friction.

scholarly journals The effect of fixed orthodontic treatment with Edgewise and Straightwire techniques on white spot lesions incidence and accumulation of Streptococcus mutans bacteria

2020 ◽  
Vol 53 (3) ◽  
pp. 170
Author(s):  
Elfira Maharani ◽  
Dyah Karunia ◽  
Pinandi Sri Pudyani
Keyword(s):  
Streptococcus Mutans ◽  
Orthodontic Treatment ◽  
Bacterial Count ◽  
Least Square ◽  
White Spot ◽  
Control Group ◽  
Orthodontic Appliances ◽  
White Spot Lesions ◽  
Fixed Orthodontic Appliances ◽  
Insignificant Difference

Background: Fixed orthodontic appliances, such as Edgewise and Straightwire techniques, can increase the amount of plaque retention containing Streptococcus mutans (S. mutans), which can lead to white spot lesions. Purpose: The aim of this study is to analyse the correlation of fixed orthodontic treatment with Edgewise and Straightwire techniques on the incidence of white spot lesions and accumulation of S. mutans. Methods: The samples consisted of three groups: control group (n=8), Edgewise technique group, and Straightwire technique group. We observed the samples at the sixth month and eighth month of the treatment, after the installation of the fixed orthodontic appliances. The observation of white spot lesions with caries detector was applied in all regions. Bacterial swabs were acquired in the lateral incisor region, then a bacterial culture procedure was carried out on selective media of S. mutans, and then a bacterial count was performed. The data was analysed using two-way ANOVA, the post-hoc least square differences test, and the Pearson’s correlation test. Results: The number of white spot lesions in the Edgewise group was higher than in the Straightwire group in the sixth and eighth month of treatment with insignificant difference (p>0.05). The number of S. mutans bacteria increased in all groups, but there were no significant differences (p>0.05). There was no significant relationship between the number of white spot lesions with the accumulation of S. mutans between groups (p>0.05). Conclusion: The Edgewise and Straightwire techniques increase the incidence of white spot lesions but accumulation of S. mutans with the incidence of white spot lesions has no relationship.

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