Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Influence of topical fluoride treatment on the mechanical properties and surface topography of translucent composite orthodontic wires
1
14
EN
Essam
E
Al Wakeel
Department of Dental Biomaterials, Faculty of Dentistry, Mansoura
University, Mansoura, Egypt
Shaza
M
Hammad
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
El Sayed
Gad
Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
10.21608/eos.2010.78855
Objective: The aim of this study was to determine the effects<br />of a fluoride prophylactic agent on the mechanical properties and<br />surface quality of a preformed round translucent composite<br />archwire comparing it with a nickel-titanium and a multistranded<br />stainless steel wires.<br />Materials and Methods: The wires were immersed in either<br />an acidulated fluoride solution (APF) or distilled water (control)<br />for 1.5 hours at 37o C. Flexural modulus of elasticity (E) and yield<br />strength (YS) of the wires were measured using a 3-point bending<br />test in a Universal Testing Machine. Springback ratio (YS/E) was<br />calculated for each wire. The influence of fluoride treatment on<br />properties of the wires was statistically analyzed using a student's<br />t-test at ; = 0.05. Surface changes were observed with a scanning<br />electron microscope.<br />Results: Fluoride treatment produced a statistically significant<br />reduction in E, YS and YS/E of the composite wire (P < 0.05). In<br />addition, a significant decrease in E of Ni-Ti wire was found after<br />exposure to fluoride, comparing it with distilled water control<br /> treatment. On the other hand, no significant effect of fluoride<br />treatment was found on YS and YS/E of Ni-Ti wire and also on<br />the studied properties of the multistranded stainless steel wire<br />(p > 0.05). Corrosive changes in surface topography were observed<br />after exposure to the fluoride agent, which were more pronounced<br />with the composite wire.<br />Conclusions: The results suggest that using topical fluoride<br />agent with translucent composite wire could decrease mechanical<br />properties and might damage surface of the wire, which potentially<br />contribute to prolonged orthodontic treatment.
composite wire,Topical Fluoride,surface topography,Mechanical Properties
https://eos.journals.ekb.eg/article_78855.html
https://eos.journals.ekb.eg/article_78855_dfee55c4e3762fa388abb0620faf0c83.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Diagnostic capability of Little irregularity index to estimate arch length discrepancy
15
34
EN
Medhat
El Sakhawhy
Orthodontic department, Faculty of Dentistry, Tanta University, Tanta, Egypt
Safaa
M
Gaballa
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
Safaa
A
Ghobashy
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
dr.safaa_ghobashy@yahoo.com
Rania
A
Hanafy
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
10.21608/eos.2010.79012
Objective: The aim of the present study is to evaluate the<br />diagnostic capability of Little irregularity index (LII) to estimate<br />arch length deficiency (ALD) in a dental arch.<br />Material and methods: Five hundred dental casts were<br />selected from 1000 study models from the patients (12-14 years<br />old) attending the Dental Clinic of Orthodontic, in Tanta<br />University. The casts were categorized according to sex, degree of<br />crowding and upper or lower. In order to classify cases according<br />to degree of crowding ALD was calculated as the difference<br />between available and required space in each dental arch anterior<br />to the first permanent molars. LII was calculated on each cast by<br />measuring the linear displacement between the six anterior teeth,<br />and was contrasted with the dichotomized ALD. The receiver<br />operator characteristic curve (ROC) was applied to suggest optimal<br />cut-off points for LII to estimate ALD.<br />Results: High correlation was observed between ALD and LII<br />(-0.91, P<0.0001). According to ROC curve, LII of >0, >3.5, >6mm<br />were optimized cut-off points to estimate minimum, moderate<br />and severe crowding respectively. Regarding the analysis of ROC
curve for minimum crowding cases, LII was found to have the<br />highest diagnostic capability of >0mm or minimum crowding with<br />sensitivity 1.00 and specificity 1.00, then the moderate crowding<br />with sensitivity 96.45 and specificity 97.96 and severe crowding<br />with of sensitivity 91.95 and specificity 84.05.<br />Conclusion: The results of ROC provided useful insights of the<br />potentiality of LII to estimate negative ALD of the dental arch.
Little index,irregularity index,arch length,ROC curve
https://eos.journals.ekb.eg/article_79012.html
https://eos.journals.ekb.eg/article_79012_f398ae51d3d801b1821e30c4f240d0b9.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Modified maxillary splint with headgear in growing class II division 1 cases
35
44
EN
Ahmed
A K
El bialy
Orthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Mona
A
Montasser
Orthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Shadi
K
Hawwara
Damascus Univesity, Damascus, Syria
10.21608/eos.2010.79014
The purpose of this study was to evaluate the dentoskeletal<br />effects of Modified Maxillary Splint with Headgear in growing<br />Class II division 1 cases. Sixteen female patients were selected for<br />this study. The mean age of the patients was 10 years, 1 month.<br />All patients were treated by Modified Maxillary Splint with<br />Headgear for an average of 11 months .The cephalometric radiographs<br />and the study models were analyzed and the collected data were<br />subjected to statistical analysis. Statistical paired T test was done<br />to determine the significant difference between the pretreatment<br />and posttreatment measurements. The Modified Maxillary Splint<br />with Headgear had skeletal and dental effects. The forward<br />maxillary growth was restrained however, the mandibular growth<br />was stimulated. The maxillomandibular relationship was improved. In<br />addition, while the lower incisors showed a noticeable anterior<br />movement and proclination. The overjet was significantly<br />improved. Conclusion: The Modified Maxillary Splint with<br />Headgear was effective in treatment of growing Class II division 1<br />patients. The appliance produced skeletal and dental effects.
class II division 1,Growth,splint,headgear
https://eos.journals.ekb.eg/article_79014.html
https://eos.journals.ekb.eg/article_79014_cb9a8b5bf5b63bc7e71462120c46fd83.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Dentofacial effects after the use of bone anchorage pendulum appliance
45
77
EN
Safaa
M
Gahalla
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
Eman
M
El Shorbagy
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
Safaa
A
Ghobashy
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
dr.safaa_ghobashy@yahoo.com
Mohamed
Ellithy
Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
10.21608/eos.2010.79018
This study was conducted to evaluate the dentofacial changes<br />after distalization of maxillary first molars using the bone anchorage<br />pendulum appliance (BAPA) and the conventional pendulum<br />appliance (PA) in the treatment of dental Class II.<br />Thirty patients were selected from the clinic of Orthodontic<br />Department, Faculty of Dentistry, Tanta University, seeking<br />orthodontic treatment. Their ages were ranged from 13-16 years for<br />both sexes. The patients were divided into two equal groups. The<br />first group consisted of 15 patients treated with Hilgers pendulum<br />appliances (PA). The second group consisted of 15 patients were<br />treated with bone anchorage pendulum appliances (BAPA). The<br />skeletal and dental changes were measured on lateral cephalometric<br />x-ray films and dental casts obtained before and after the distalization.<br />T- test was used for statistical evaluation.<br />In both groups all first maxillary molars were moved distally<br />into a super class I relationship successfully in 6.49 months for<br />BAPA group and 5.65 months for PA group, The average amounts<br />of molar distal movement and tipping were (5.12 mm, 7.6°) in the<br />BAPA group and (6.19 mm, 8.8°) in the PA group. The result<br />showed that, the molar tipped 1.48° per millimeter of distal tooth
movement in BAPA group, and 1.42° per millimeter in PA group.<br />The maxillary second premolars, first premolars and central incisors<br />in BAPA group exhibited significant distal movement which<br />would positively affect the prognosis in contrast there was a<br />significant mesial tipping of the maxillary first premolars and<br />central incisors in PA group. Regarding anterior anchorage, there<br />was a reciprocal anchorage loss in the form of maxillary incisors<br />protrusion in PA group; however BAPA group showed no anchorage<br />loss. Lower anterior and total anterior Facial heights increased<br />significantly during the treatment in the two groups. The maxillary<br />intermolar widths were significantly increased in both groups. The<br />maxillary arch perimeter was increased in both groups, which was more<br />pronounced in PA group indicating anchorage loss.<br />The results showed that the BAPA appliance is an effective<br />and minimally invasive, compliance free alternative for intraoral<br />molar distalization without anchorage loss.
skeletal anchorage,pendulum,Cass II,anchorage,cephalometric
https://eos.journals.ekb.eg/article_79018.html
https://eos.journals.ekb.eg/article_79018_18dc7a0e7cd88487d4a4ae109b3d3e80.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Dento-skeletal effects of Teuscher activator in treatment of class II division 1 malocclusion cases
79
92
EN
Maher
A
Fouda
Orthodontic Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
dr_maherfouda@yahoo.com
Ahmad
M
Hafez
Orthodontic Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Mamoun
A
Khawileh
Nicolae Testemitanu University, Chisinau, Moldova
10.21608/eos.2010.79021
The purpose of this study was to determine dental and<br />skeletal effects of the of Teuscher activator in treatment of Class<br />II Division 1 malocclusion cases. Sixteen patients (eight males and<br />eight females) with Class Division 1 malocclusion were selected for<br />this study. The mean age of the patients was 10 years 5 months.<br />All patients were treated with the Teuscher activator for one year.<br />Cephalometric radiographs and plaster study models were made at<br />two stages; before and after treatment by the Teuscher activator.<br />The cephalometric radiographs and the study models were analyzed<br />and the collected data were subjected to statistical analysis.<br />Statistical paired T test was done to determine the significant<br />difference between the pretreatment and posttreatment measurements.<br />Results: The SNA angle was significantly decreased (P = .002).<br />The SNB angle was significantly increased (P = 000). The ANB<br />angle was significantly decreased (P = 000). The mandibular plane,<br />palatal plane, and Y-axis angles (SN-MP, SN-PP. and Y-axis<br />respectively) were not significantly affected (P = .204, P =.705,<br />P = .041 and P = .064). Teuscher functional appliance could be<br />used successfully in treatment of Class II Division 1 malocclusion<br />cases.
class II division 1,Teusher,activator,cephalometric
https://eos.journals.ekb.eg/article_79021.html
https://eos.journals.ekb.eg/article_79021_d4c8e26f277c4fc6384beb8db7647dfd.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
The effect of crystal growth on shear bond strength of metallic brackets and atomic force microscope topographic evaluation of treated enamel
93
106
EN
Abeer
M
Abdellatif
Department of Pediatric Dentistry and Public Health, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Shaza
M
Hammad
Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
10.21608/eos.2010.79025
the residual adhesive after debonding using two concentrations<br />of sulfated polyacrylic acid and the conventional acid etchant, and<br />the topography of treated enamel using Atomic Force Microscopic<br />examination (AFM).<br />Methodology: A total of 75 premolars were divided into three<br />groups; 20 teeth each for shear bond strength test, and 5 teeth each<br />for AFM. Three solutions were used; Solution I, 37% phosphoric<br />acid, and two concentrations of sulphated polyacrylic acid<br />(Solutions II, and III). Brackets were bonded, and the shear bond<br />strength was measured using a universal testing instrument at a<br />crosshead speed of 1mm/min. The residual adhesive was explored<br />using a stereomicroscope at 20 times magnification, and quantified<br />using the ARI. The topographic pattern of treated enamel was<br />evaluated, using AFM, and an untreated enamel as a negative<br />control.<br />Results: Solutions II and III, demonstrated lower shear bond<br />strength (10.6MPa, 6.1MPa), compared with that of acid etchant<br />(17.5 MPa). A significant difference in the distribution of ARI<br />scores was found between group I and II, III (P ;0.001), with
more cement remaining on the teeth of group I. The AFM images<br />showed a noticeable difference in the surface topography, with<br />crystal deposits on the enamel surfaces treated with solution II.<br />Conclusions: The concentration of 30% sulfated polyacrylic<br />acid can be considered as an alternative to phosphoric acid. The<br />shear bond strength value obtained was above the minimum of the<br />clinically accepted for orthodontic use.
crystal growth,Shear bond strength,residual adhesive,orthodontic brackets
https://eos.journals.ekb.eg/article_79025.html
https://eos.journals.ekb.eg/article_79025_bf34bcc2734c28360023bfd6fdeb11f4.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
38
December 2010
2010
12
01
Effect of hyperbaric oxygen mobility of orthodontically treated teeth
107
124
EN
Hany
S
Eid
Department of Orthodontics, Faculty of Dentistry, Misr University for Science and Technology, 6th of October City, Egypt
Waleed
El Sayed
Department of Orthodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
10.21608/eos.2010.79029
Objectives: The present study was designed to investigate the<br />effect of hyperbaric oxygen therapy (HBOT) on improving tooth mobility<br />during orthodontic treatment using a Periotest. Methods: Twenty<br />orthodontic cases (n=20) without severe skeletal discrepancies were<br />used as subjects. For each subject, the mobility of the central and<br />lateral incisors on both arches (U1, U2, L1, and L2) was measured<br />immediately before orthodontic treatment (T1), after 12 months of<br />treatment (T2), and after 3 months from T2 stage (T3) by use of a<br />Periotest. The sample was randomly divided into two groups (n=10).<br />The first group was administered HBO for 60 minutes, at 2.5 ATA<br />(atmospheres absolute) for five consecutive days immediately after<br />T2 stage, and the second group served as a control. For both<br />groups the mean values of T1 stages were calculated and compared<br />to those of T2 and T3 stages in the same group. Results: At T2 and<br />T3 stages, the periotest mean values have increased for all the teeth<br />in the second group without HBOT in comparison with those at<br />T1 stage in the same group. However, in the first group that has<br />been given HBOT, the mean values have significantly increased at<br />T2 stage compared with those at T1 stage, but the mean values at<br />T3 stage have significantly decreased compared with those at T2<br />stage in the same group. Conclusions: It is suggested that hyperbaric
oxygen therapy (HBOT) may be useful in reducing tooth mobility<br />noticed during and after orthodontic treatment.
hyperbaric oxygen therapy,orthodontic tooth movement,periostat,mobility
https://eos.journals.ekb.eg/article_79029.html
https://eos.journals.ekb.eg/article_79029_b1087ffdf5a76e64b7bfe8ad76098fbd.pdf