Evaluation of the effect of different beverages on the mechanical properties of orthodontic arch wires
Ahmad
Hafez
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
text
article
2017
eng
Purpose: This study was conducted to evaluate the effect of different beverages on surface microhardness, modulus of elasticity and flexural strength of orthodontic archwires.Materials and Methods: Four orthodontic archwires (stainless steel, NiTi, copper NiTi and Teflon-coated NiTi) were used. They were immersed in three different solutions (Artificial saliva, tea and Coca Cola) for fourweeks. For mechanical properties assessment, the specimens were classified mainly intofour groups (90 specimens each) according to the archwire type. Each group was further subdivided into 3 subgroups (30 specimens arch) according to the used solution. Each subgroup had been divided into three divisions (10 specimens each) according to the test parameter (surface microhardness, modulus of elasticity, flexural strength). Surface microhardness was evaluated using Vickers hardness tester. While modulus of elasticity and flexural strength were measured by subjecting the archwires specimens to the three point bending test using a universal testing machine. Means and standard deviations were calculated for all tests. The data was analyzed and compared using two-way ANOVA analysis and Least Significant Difference (LSD) test (p < 0.05). Results: Artificial saliva significantly decreased the surface microhardness of St. St. and Teflon-coated NiTi archwires and significantly decreased the modulus of elasticity of NiTi, CuNiTi, St.St. archwires. Tea and Coca Cola significantly decreased the surface microhardness of CuNiTi, St. St. and Teflon-coated NiTi archwires and significantly decreased the modulus of elasticity of all archwire specimens. Two-way ANOVA results revealed significant difference among the tested groups (p < 0.001). Conclusions: Tea and Coca Cola potentially would contribute to the change in the mechanical properties of orthodontic archwires leading to prolonged orthodontic treatment.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
6
15
https://eos.journals.ekb.eg/article_78353_602a33ad31fe59a5e2fc48d127cd1802.pdf
dx.doi.org/10.21608/eos.2017.78353
Influence of local application of symvastatin on orthodontic relapse: an experimental study
Hani
Al Swafeeri
Department of Orthodontics, Faculty of Dentistry, Pharos University, Alexandria
author
Walid
El Kenany
Department of Orthodontics, Faculty of Dentistry, Alexandria University
author
Mohamed
Mowafi
Department of Orthodontics, Faculty of Dentistry, Alexandria University
author
Sahar
Karam
Department of Oral Biology, Faculty of Dentistry, Alexandria University
author
text
article
2017
eng
Introduction: Orthodontic relapse is a physiological response of the supporting tissues to force application threatening the success of orthodontic therapy. The objective of this study was to evaluate the influence of local application of simvastatin on the magnitude of orthodontic relapse. Methods: Orthodontic tooth movement was induced in 10 white New Zealand rabbits. After 21 days of active tooth movement, orthodontic appliances were removed and the experimental teeth were allowed to relapse for further 21 days. During the relapse phase, one mandibular quadrant received local simvastatin administration while the corresponding mandibular quadrant received control vehicle solution on a weekly basis. Magnitudes of experimental tooth movement and post-orthodontic relapse were calculated. Results: The mean relapse magnitude was 1.31±0.53mm in the quadrant receiving control vehicle solution and 1.14±0.47mm in the quadrant receiving simvastatin administration. Neither the relapse magnitude nor the relapse percentage showed a significant difference between the two quadrants. Conclusion: Local simvastatin administration could not minimize post-orthodontic relapse magnitude to a significant level.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
16
23
https://eos.journals.ekb.eg/article_77115_9398f053792e4416ea8834d6064fd746.pdf
dx.doi.org/10.21608/eos.2017.77115
Assessment of force decay of different orthodontic power chains without pre-stretching
Ahmed
Fouda
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
text
article
2017
eng
Objective: The purpose of this study was to determine the force decay value of four different types of power chains used in orthodontic treatment. Materials and Methods: A sample of 20 specimens, which was divided into five piece taken from each type of the four power chains, each piece, contains six rings. The rings were placed on steel pins embedded in acrylic sheets and poured in hard stone blocks. The force of the elastomeric chains was recorded in dry state and compared to data after immersion in artificial saliva at 37 degree in bacterial incubator at time interval of 1 hour, 1 day, 1 week, 3 weeks. Results: Significant difference was found in percentage of reduction in force between the four types of the powerchains in dry field and after immersion in artificial saliva. After 3 weeks testing Morelli power chains had 41.8% reduction in force, Ultimate power chains scored 36.9% reduction in force, Dentsply power chains scored 30.8% reduction in force and Ultra- chains scored 27.2% reduction in force. Conclusion: All types of power chains showed force decay with different values after 3 weeks of testing. Choose the appropriate force value for tooth movement play important role success of orthodontic treatment.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
24
30
https://eos.journals.ekb.eg/article_78355_0d8b2464b8d34fde3563b78433540513.pdf
dx.doi.org/10.21608/eos.2017.78355
Spectrophotometric evaluation of different protocols of resin infiltration of white spot lesions with various depths
Bassant
Mohamed
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
Eiman
Marzouk
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
Abbas
Zaher
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
text
article
2017
eng
Objectives: This study was conducted to evaluate the efficiency of resin infiltration to improve the color of White SpotLesions (WSLs), and to estimate the effect of different numbers of etching and resin infiltrant applications on the color change of WSLs with various depths. Methods: 96 sound extracted premolars were subjected to acid attack inducing different depths of WSLs. Using a DIAGNOdent, teeth were divided into four main groups according to the depth of the WSLs: shallow enamel, deep enamel, shallow dentine and deep dentine without cavitation. Then each of the main groups was subdivided into 4 groups; 6 teeth each with different protocols of resin infiltration as follows: 1 Etching + 1 infiltrantApplication (EA), 1 Etching + 2 infiltrant Applications (EAA), 2 Etchings + 1 infiltrant Application (EEA), 2 Etchings + 2 infiltrant Applications (EEAA). Spectrophotometric analysis was measured at baseline (T0), after inducing the WSLs (T1), and following resin infiltration application (T2) for each group. Results: In shallow enamel, EA produced the least mean color difference (1.62±0.85), with high significant difference (P < 0.001), when compared with the clinically detectablethreshold (ΔE =3.7). While in deep enamel, EAA showed the least mean color change (1.95±0.4), with P < 0.001 when compared with the critical value. Also, in shallow dentine, the least mean change was noticed with EAA (3.0±0.45), P < 0.001 when compared with the clinical color detection threshold. Furthermore, in deep dentine, EAA had the least mean difference (3.76±0.6) but with no significant difference, when compared with the clinically detectable threshold. Conclusion: As the WSL got deeper, the color of the lesion became more clinically visible. In shallow enamel, the best treatment option was one etching with one resin infiltrant application. For deep enamel and shallow dentine, one etching with two applications of infiltrant gave the best lesion masking. In deep dentine it is advisable to perform one etching with two infiltration steps, taking in consideration that all deep dentine lesions without cavitation were partiallymasked, remained clinically detectable and might require more invasive restorative procedures.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
31
44
https://eos.journals.ekb.eg/article_78356_4f616bf4ab90c18eb388fc8725901e86.pdf
dx.doi.org/10.21608/eos.2017.78356
Frictional resistance of active and passive aesthetic self-ligating brackets with different orthodontic wire sizes
Yasser
Emam
Orthodontics department, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
author
Sherif
Morcos
Orthodontics department, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
author
Mohamed
Nadim
Orthodontics department, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
author
Abbadi
El Kady
Orthodontics department, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
author
text
article
2017
eng
The purpose of this study was toinvestigate the effect of passive and active Self-ligation of aesthetic brackets on the static and kinetic friction with different wire sizes. Two types of ceramic brackets were used; Empower Clear (active self-ligatingbracket (ASLB)) and Damon Clear 2 (passive self-ligating bracket (PSLB)). They were coupled with 0.017 x 0.025-in and 0.019 x 0.025-in stainless-steel (SS) wires. A universal testing machine was used to pull the brackets along the distal end of the archwire. The test was performed at 5 mm/min crosshead speed over a distance of 8 mm to measure the static friction (SF) and the kinetic friction (KF) under dry conditions. The results showedthe PSLB’s to have significantly lower SF and KF with both wire sizes.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
45
54
https://eos.journals.ekb.eg/article_78358_7d1e08e833f4fde7f006f987c56d3b59.pdf
dx.doi.org/10.21608/eos.2017.78358
Effect of micro-osteoperforations on the rate of canine retraction: a split-mouth randomized controlled clinical trial
Farah
Eid
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
Walid
El Kenany
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
Ahmed
El Kalza
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
text
article
2017
eng
INTRODUCTION: The prolonged orthodontic treatment time is considered a major concern both for patients and clinicians.Corticotomy has been proposed as a method for acceleration of orthodontic tooth movement and was found successful. However, its popularity decreased because of its invasiveness. Micro-osteoperforations have been proposed for acceleration with minimal invasiveness. OBJECTIVE: The purpose of the study was to clinically evaluate the effect of micro-osteoperforations on the rate of orthodontic tooth movement as evaluated by its effect on the rate of canine retraction. MATERIALS AND METHODS: The study was a split-mouth randomized controlled clinical trial, with a sample size of 10 adult patients (mean age 17.5±2.5 years) requiring the therapeutic extraction of maxillary first premolars’ followed by canine retraction. Micro-osteoperforations were randomly assigned to one side of the maxillary arch at the canine-premolar region, and the contra-lateral side served as control. Anchorage reinforcement was performed usingmini-screws, and canine retraction was performed using nickel-titanium closed coil springs, delivering a force of 150 grams on each side. The rate of canine retraction was measured throughout the study period from dental models obtained at the follow-up visits every 3 weeks. RESULTS: The average daily rate of canine retraction was significantly higher on the experimental side compared to that on the control side by approximately 2 times during the first 9 weeks of the study. CONCLUSION: Micro-osteoperforations have been found clinically successful in accelerating orthodontic tooth movement and shortening the treatment duration. However, acceleration of tooth movement has been found significant during the first 9 weeks, which represent the period of regional acceleratory phenomenon.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
55
64
https://eos.journals.ekb.eg/article_78357_88f67978a719f1220738a7b0b412308d.pdf
dx.doi.org/10.21608/eos.2017.78357
The effects of utilizing conventional etching versus self etch primer on the enamel color change after treatment with fixed orthodontic appliances: in vivo study
Ahmad
Hafez
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
author
text
article
2017
eng
Objectives: The present study was conducted to evaluate clinically the effect of conventional etching and the self etchprimer on the change in enamel color before and after orthodontic treatment. Materialand Methods: The study was conducted on 24 patients treated with fixed orthodonticappliances. Metal brackets were bonded to the teeth mesial to first molars. The bracketswere bonded utilizing Transbond XT adhesiveafter application of either conventional etching (%37 phosphoric acid etch and Transbond XT primer) or Transbond XT self etch primer (splitmouth design). Teeth which showed bracket bond failure were excluded from the study. Therefore, the final number of teeth which were included in the conventional etch and self etch groups were 164 and 160 respectively. The color of the labial and buccal surfaces of the teeth mesial to the first molars was evaluated before bracket bonding and after orthodontic treatment. This step was done with the aid of spectrophotometer Vita Easyshade (Vita Zahnfabri, Germany). The evaluation of the color depended on the color space system of CIELAB (Commission Internationale de
l›Eclairage L*, a* and b*). Three parameters were measured (L*, a*, b*). Also, color change(ΔE) was calculated. Then the collected data was statistically analyzed using Paired t-test.Results: All color measurements (L*, a*, b*) were significantly decreased after orthodontic treatment(P<0.05). Conventional etching provided significantly higher ΔE value than the self etch primer (P<0.05).Conclusion: The utilization of conventional etching or self etch primer have a significant negative effect ontooth color after orthodontic treatment. However, the conventional etching has higher pronounced effects.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
52
v.
December 2017
no.
2017
66
72
https://eos.journals.ekb.eg/article_77161_4b11b67c3396206996021d8bb8c29120.pdf
dx.doi.org/10.21608/eos.2017.77161