2024-03-29T08:23:21Z
https://eos.journals.ekb.eg/?_action=export&rf=summon&issue=11741
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
The effects of gingival fibrotomy on the rate of canine retraction and anchorage loss
Shacker
Al Magaleh
Maha
Abu Khedr
Hanan
Ismail
Walid
El Kenany
Introduction: This study investigated the effects of the gingival fibrotomy on the rate of canine retraction and anchorage loss. Methods: A split-mouth design RCT study was conducted in 20 patients (18 women, 2 men; mean age, 16.18±1.39 years) who need maxillary first premolars extraction and canines retraction. Fibrotomy was randomly allocated to one canine and the other used as control. Canines were retracted by closed coil springs applying 150 g in both sides. Rate of canine retraction and rate of anchorage loss were assessed using dental casts taken every 4 weeks. Results: No statistical significant difference was detected between both sides in the rate of canine retraction. The rate of anchorage loss showed statistically significant but clinically insignificant difference at the period of 4 and 16 weeks. Conclusion: Gingival fibrotomy around the upper canine in combination with extraction of the first premolar resulted in the same rate of canine retraction and anchorage loss in comparison to extraction of the first premolar only.
Fibrotomy
retraction
anchorage
2016
12
01
1
12
https://eos.journals.ekb.eg/article_78668_5e806f0296434340f8ec03eda93b4df2.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
Effect of different fluoride releasing bonding agents in preventing of enamel demineralization around orthodontic brackets
Mostafa
Mohamed
Waleed
Refaat
Sherif
Morcos
Objective: Compare the effect of different fluoride releasing bonding agents in prevention of enamel demineralization around the orthodontic brackets. Materials and methods: 100 premolar used, these premolars were bonded by 5 bonding agents which were: group 1: Twenty brackets were bonded by Transbond XT adhesive (control group). group 2: Twenty brackets were bonded by Transbond plus color change adhesive. group 3: Twenty brackets were bonded by Transbond XT and covered by Fluoride. group 4: Twenty brackets were bonded by GC Fuji ORTHO lC. group 5: Twenty brackets were bonded by Ketac Cem, subjected to pH cycle for 21 days at room temperature then examined by visual examination and examined by electron microscope. Results: Fuji Ortho showed the least demineralization while composite (Transbond XT showed the most one in demineralization of teeth. Conclusion: Fuji Ortho L.C bonding agent showed the highest property in preventing of demineralization during orthodontic treatment
Scanning electron microscope
orthodontic bonding agents
Fuji Ortho
White spot lesions
2016
12
01
13
34
https://eos.journals.ekb.eg/article_78669_ab121a66651a885defd85de60ac5f4c4.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
Assessment of self-assembling peptide P 11-4 in the treatment of white spot lesions after orthodontic treatment
Fatma
Abdel Aziz
Tarek
Marei
Magda
elmalt
The aim of the current study was to investigate the effect of commercially available Curodont on enamel surface with white spot lesions after orthodontic treatment. A total of 14 teeth with white spot lesions in orthodontically treated subjects aged 12 to 22 years were enrolled in this clinical study. All participants recently finished their treatment with fixed orthodontic appliances in the Department of Orthodontics at the Faculty of Dentistry for girls, Al-Azhar University. Digital periapical x-ray was taken before and after three months of curodont application. Comparisons between the measures of the baseline and post treatment images were calculated to determine the radiodenisty change (mineral content change) before and after treatment. Paired t-test was used to compare between enamel mineral content change before and after treatment. Also saliva was collected to measure the change of pH of saliva after three and six months, using saliva – check buffer Testing. The results showed that there was a statistically significant increase in enamel mineral content after treatment. The mean±standard deviation values of percentage increase were 25.7±16.1%. Conclusion: Curodont proved to be an effective remineralizing agent for treatment of enamel WSLs that occurred after orthodontic treatment.
self assembling peptide
P 11-4
White spot lesions
remineralization
2016
12
01
35
48
https://eos.journals.ekb.eg/article_78670_2c3011e8ccb3e00e9d89be23c3fdf736.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
Effect of various porcelain surface treatment methods on shear bond strength of orthodontic adhesive
Ayman
Eissa
Walid
Refaat
Sherif
Morcos
Objective: to evaluate the effect of different treatment methods of porcelain surfaces before bonding on the shear bond strength of orthodontic adhesive. Material and methods: This study was conducted on a sample of sixty feldspathic porcelain cylinders stored in artificial saliva for a week. The sample was divided into five equal groups twelve each according to the applied surface treatment, Gp1 diamond bur roughening, and Gp2 etching 37% phosphoric acid GP3 Laser etching Gp4 9% hydrofluoric acid etching Gp5 sandblasting 50 micron aluminum oxide particles. Randomly one specimen from each group was scanned by electron microscope while the other specimens were bonded to metal brackets and stored in artificial saliva for one week then mounted in acrylic blocks to allow measuring the shear bond strength using Instron universal testing machine. Results: Diamond bur group showed significant difference with all other groups. There is significant difference between phosphoric acid and laser on one hand and sand blasting and hydrofluoric on the other hand. But for both phosphoric acid and laser groups there is no significant difference and for both sand blasting and hydrofluoric acid groups there is no significant difference. Conclusion: The diamond bur group showed the highest bond strength, while phosphoric acid showed the least one.
Shear bond strength
Laser
orthodontic brackets
2016
12
01
49
67
https://eos.journals.ekb.eg/article_78672_70f7653477ffb3fb46424f1b7b7e6006.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
Effect of surface treatment methods of porcelain discs on the shear bond strength of two orthodontic adhesives: an in vitro study
Nada
Elkady
Mohamed
Nadim
Ahmad
Ramadan
Introduction: Ceramic is an inert material. Mechanical or chemical ceramic surface preparation is needed prior to the bonding such as Microetcher II for mechanical surface preparation while hydrofluoric acid for chemical surface preparation. Composite resin is a hydrophobic material while cyanoacrylate is a hydrophilic one. Objective: The aim of the study was to study and compare the effect of surface treatment methods of porcelain discs on shear bond strength of two orthodontic adhesives (light cure composite resin and light cure cyanoacrylate). Materials and Methods: The study was conducted on ninety eight feldspathic circular glazed porcelain discs divided into two main groups Group A (N=8) which was examined by SEM to determine the effect of the surface treatment methods on the surface texture (micropores) and to compare it with the two untreated discs and Group B (N=90) which was divided into six subgroups of fifteen; these specimens were used for the shear bond strength testing, three subgroups bonded by composite resin and three subgroups bonded by cyanoacrylate. ARI were measured after debonding for the specimens under SEM. The statistical analysis was carried out using SPSS program (SPSS, 2008). Cross tabulation and Chi square test were used to test the ARI. Results: Subgroup 1 (composite after sandblasting and acid etching) showed the highest shear bond strength among all subgroups with mean16.27 MPa followed by Subgroup 3 (composite after acid etching) with mean 14.96 Mpa, Subgroup 4 (cyanoacrylate after sandblasting and acid etching) with mean13.32 MPa, Subgroup 6 (cyanoacrylate after acid etching) with mean 12.47 MPa, Subgroup 2 (composite after sandblasting) with mean 7.86 MPa Subgroup 5 (cyanoacrylate after sandblasting) had the lowest shear bond strength among all subgroups with mean 6.63 MPa. Conclusions: Composite subgroups had higher shear bond strength than cyanoacrylate subgroups, but cyanoacrylate results were in the clinically acceptable range.
Shear bond strength
Scanning electron microscope
adhesive remnant index
micropores
microetcher II
hydroflouric acid
composite resin
cyanoacrylate
2016
12
01
69
84
https://eos.journals.ekb.eg/article_78674_fa5d972025eeacf4cf42efaf18cac345.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2016
50
December 2016
Assessment of friction resistance of four orthodontic arch wires using three ligation methods in dry and wet conditions
Atia
Yousif
Usama
Abdel Karim
Aim: Comparison of static and dynamic friction resistance of stainless steel (SS), nickel titanium (NiTi), titanium molybdenum alloy (TMA) and copper nickel titanium (CuNiTi) archwires using three different methods of ligation; St St ligature, Slide low friction elastics and conventional elastics in both dry and wet conditions. Materials and Methods: 144 new orthodontic arch wires were divided according to the alloy type into four groups with 36 archwires for each; group 1: stainless steel (SS), group 2: nickel titanium (NiTi), group 3: titanium molybdenum alloy (TMA) and group 4: copper nickel titanium (CuNiTi). Each group was divided according to the method of ligation into three subgroups with 12 archwires for each; subgroup A: ligated with SS ligature, subgroup B: ligated with Slide low friction elastics and subgroup C: ligated with conventional elastics. Static and kinetic friction resistance was measured using Lloyd Instruments in both dry and wet conditions by adding artificial saliva. Student t-test, ANOVA and LSD’s test were used for statistical analysis. Significance level was set at P≤ 0.05. Results: Student t-test showed static and kinetic friction for wet conditions were highly significant lower than dry conditions for the same arch wire/ligature cominations (P<= 0.001). Static and kinetic frictionresistance of SS archwires had significantly the least amount of friction followed by TMA then NiTi (Nitinol) and lastly CuNiTi. SS ligature exhibited significantly the least amount of friction followed by Slide low friction elastics while conventional elastics exhibited the greatest amount of friction (P<0.001). Conclusions: Wet conditions are essential for reducing friction in stainless steel bracket/archwire/ligature combinations. Stainless Steel archwire ligated to the SS bracket with SS ligatures exhibited the least amount of static and dynamic friction resistance followed by TMA and then NiTi and CuNiTi in an ascending order. SS ligature showed the least amount of friction followed by Slide elastomers and conventional elastic reported the highest friction resistance.
friction resistance
arch wires
ligation
2016
12
01
85
102
https://eos.journals.ekb.eg/article_78675_4f81d90dd081f2be6fbc3258b539a6e1.pdf