2024-03-29T15:05:08Z
https://eos.journals.ekb.eg/?_action=export&rf=summon&issue=11771
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Influence of topical fluoride treatment on the mechanical properties and surface topography of translucent composite orthodontic wires
Essam
Al Wakeel
Shaza
Hammad
El Sayed
Gad
Objective: The aim of this study was to determine the effectsof a fluoride prophylactic agent on the mechanical properties andsurface quality of a preformed round translucent compositearchwire comparing it with a nickel-titanium and a multistrandedstainless steel wires.Materials and Methods: The wires were immersed in eitheran acidulated fluoride solution (APF) or distilled water (control)for 1.5 hours at 37o C. Flexural modulus of elasticity (E) and yieldstrength (YS) of the wires were measured using a 3-point bendingtest in a Universal Testing Machine. Springback ratio (YS/E) wascalculated for each wire. The influence of fluoride treatment onproperties of the wires was statistically analyzed using a student'st-test at ; = 0.05. Surface changes were observed with a scanningelectron microscope.Results: Fluoride treatment produced a statistically significantreduction in E, YS and YS/E of the composite wire (P < 0.05). Inaddition, a significant decrease in E of Ni-Ti wire was found afterexposure to fluoride, comparing it with distilled water control treatment. On the other hand, no significant effect of fluoridetreatment was found on YS and YS/E of Ni-Ti wire and also onthe studied properties of the multistranded stainless steel wire(p > 0.05). Corrosive changes in surface topography were observedafter exposure to the fluoride agent, which were more pronouncedwith the composite wire.Conclusions: The results suggest that using topical fluorideagent with translucent composite wire could decrease mechanicalproperties and might damage surface of the wire, which potentiallycontribute to prolonged orthodontic treatment.
composite wire
Topical Fluoride
surface topography
Mechanical Properties
2010
12
01
1
14
https://eos.journals.ekb.eg/article_78855_dfee55c4e3762fa388abb0620faf0c83.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Diagnostic capability of Little irregularity index to estimate arch length discrepancy
Medhat
El Sakhawhy
Safaa
Gaballa
Safaa
Ghobashy
Rania
Hanafy
Objective: The aim of the present study is to evaluate thediagnostic capability of Little irregularity index (LII) to estimatearch length deficiency (ALD) in a dental arch.Material and methods: Five hundred dental casts wereselected from 1000 study models from the patients (12-14 yearsold) attending the Dental Clinic of Orthodontic, in TantaUniversity. The casts were categorized according to sex, degree ofcrowding and upper or lower. In order to classify cases accordingto degree of crowding ALD was calculated as the differencebetween available and required space in each dental arch anteriorto the first permanent molars. LII was calculated on each cast bymeasuring the linear displacement between the six anterior teeth,and was contrasted with the dichotomized ALD. The receiveroperator characteristic curve (ROC) was applied to suggest optimalcut-off points for LII to estimate ALD.Results: High correlation was observed between ALD and LII(-0.91, P<0.0001). According to ROC curve, LII of >0, >3.5, >6mmwere optimized cut-off points to estimate minimum, moderateand severe crowding respectively. Regarding the analysis of ROC
curve for minimum crowding cases, LII was found to have thehighest diagnostic capability of >0mm or minimum crowding withsensitivity 1.00 and specificity 1.00, then the moderate crowdingwith sensitivity 96.45 and specificity 97.96 and severe crowdingwith of sensitivity 91.95 and specificity 84.05.Conclusion: The results of ROC provided useful insights of thepotentiality of LII to estimate negative ALD of the dental arch.
Little index
irregularity index
arch length
ROC curve
2010
12
01
15
34
https://eos.journals.ekb.eg/article_79012_f398ae51d3d801b1821e30c4f240d0b9.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Modified maxillary splint with headgear in growing class II division 1 cases
Ahmed
El bialy
Mona
Montasser
Shadi
Hawwara
The purpose of this study was to evaluate the dentoskeletaleffects of Modified Maxillary Splint with Headgear in growingClass II division 1 cases. Sixteen female patients were selected forthis study. The mean age of the patients was 10 years, 1 month.All patients were treated by Modified Maxillary Splint withHeadgear for an average of 11 months .The cephalometric radiographsand the study models were analyzed and the collected data weresubjected to statistical analysis. Statistical paired T test was doneto determine the significant difference between the pretreatmentand posttreatment measurements. The Modified Maxillary Splintwith Headgear had skeletal and dental effects. The forwardmaxillary growth was restrained however, the mandibular growthwas stimulated. The maxillomandibular relationship was improved. Inaddition, while the lower incisors showed a noticeable anteriormovement and proclination. The overjet was significantlyimproved. Conclusion: The Modified Maxillary Splint withHeadgear was effective in treatment of growing Class II division 1patients. The appliance produced skeletal and dental effects.
class II division 1
Growth
splint
headgear
2010
12
01
35
44
https://eos.journals.ekb.eg/article_79014_cb9a8b5bf5b63bc7e71462120c46fd83.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Dentofacial effects after the use of bone anchorage pendulum appliance
Safaa
Gahalla
Eman
El Shorbagy
Safaa
Ghobashy
Mohamed
Ellithy
This study was conducted to evaluate the dentofacial changesafter distalization of maxillary first molars using the bone anchoragependulum appliance (BAPA) and the conventional pendulumappliance (PA) in the treatment of dental Class II.Thirty patients were selected from the clinic of OrthodonticDepartment, Faculty of Dentistry, Tanta University, seekingorthodontic treatment. Their ages were ranged from 13-16 years forboth sexes. The patients were divided into two equal groups. Thefirst group consisted of 15 patients treated with Hilgers pendulumappliances (PA). The second group consisted of 15 patients weretreated with bone anchorage pendulum appliances (BAPA). Theskeletal and dental changes were measured on lateral cephalometricx-ray films and dental casts obtained before and after the distalization.T- test was used for statistical evaluation.In both groups all first maxillary molars were moved distallyinto a super class I relationship successfully in 6.49 months forBAPA group and 5.65 months for PA group, The average amountsof molar distal movement and tipping were (5.12 mm, 7.6°) in theBAPA group and (6.19 mm, 8.8°) in the PA group. The resultshowed that, the molar tipped 1.48° per millimeter of distal tooth
movement in BAPA group, and 1.42° per millimeter in PA group.The maxillary second premolars, first premolars and central incisorsin BAPA group exhibited significant distal movement whichwould positively affect the prognosis in contrast there was asignificant mesial tipping of the maxillary first premolars andcentral incisors in PA group. Regarding anterior anchorage, therewas a reciprocal anchorage loss in the form of maxillary incisorsprotrusion in PA group; however BAPA group showed no anchorageloss. Lower anterior and total anterior Facial heights increasedsignificantly during the treatment in the two groups. The maxillaryintermolar widths were significantly increased in both groups. Themaxillary arch perimeter was increased in both groups, which was morepronounced in PA group indicating anchorage loss.The results showed that the BAPA appliance is an effectiveand minimally invasive, compliance free alternative for intraoralmolar distalization without anchorage loss.
skeletal anchorage
pendulum
Cass II
anchorage
cephalometric
2010
12
01
45
77
https://eos.journals.ekb.eg/article_79018_18dc7a0e7cd88487d4a4ae109b3d3e80.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Dento-skeletal effects of Teuscher activator in treatment of class II division 1 malocclusion cases
Maher
Fouda
Ahmad
Hafez
Mamoun
Khawileh
The purpose of this study was to determine dental andskeletal effects of the of Teuscher activator in treatment of ClassII Division 1 malocclusion cases. Sixteen patients (eight males andeight females) with Class Division 1 malocclusion were selected forthis study. The mean age of the patients was 10 years 5 months.All patients were treated with the Teuscher activator for one year.Cephalometric radiographs and plaster study models were made attwo stages; before and after treatment by the Teuscher activator.The cephalometric radiographs and the study models were analyzedand the collected data were subjected to statistical analysis.Statistical paired T test was done to determine the significantdifference between the pretreatment and posttreatment measurements.Results: The SNA angle was significantly decreased (P = .002).The SNB angle was significantly increased (P = 000). The ANBangle was significantly decreased (P = 000). The mandibular plane,palatal plane, and Y-axis angles (SN-MP, SN-PP. and Y-axisrespectively) were not significantly affected (P = .204, P =.705,P = .041 and P = .064). Teuscher functional appliance could beused successfully in treatment of Class II Division 1 malocclusioncases.
class II division 1
Teusher
activator
cephalometric
2010
12
01
79
92
https://eos.journals.ekb.eg/article_79021_d4c8e26f277c4fc6384beb8db7647dfd.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
The effect of crystal growth on shear bond strength of metallic brackets and atomic force microscope topographic evaluation of treated enamel
Abeer
Abdellatif
Shaza
Hammad
the residual adhesive after debonding using two concentrationsof sulfated polyacrylic acid and the conventional acid etchant, andthe topography of treated enamel using Atomic Force Microscopicexamination (AFM).Methodology: A total of 75 premolars were divided into threegroups; 20 teeth each for shear bond strength test, and 5 teeth eachfor AFM. Three solutions were used; Solution I, 37% phosphoricacid, and two concentrations of sulphated polyacrylic acid(Solutions II, and III). Brackets were bonded, and the shear bondstrength was measured using a universal testing instrument at acrosshead speed of 1mm/min. The residual adhesive was exploredusing a stereomicroscope at 20 times magnification, and quantifiedusing the ARI. The topographic pattern of treated enamel wasevaluated, using AFM, and an untreated enamel as a negativecontrol.Results: Solutions II and III, demonstrated lower shear bondstrength (10.6MPa, 6.1MPa), compared with that of acid etchant(17.5 MPa). A significant difference in the distribution of ARIscores was found between group I and II, III (P ;0.001), with
more cement remaining on the teeth of group I. The AFM imagesshowed a noticeable difference in the surface topography, withcrystal deposits on the enamel surfaces treated with solution II.Conclusions: The concentration of 30% sulfated polyacrylicacid can be considered as an alternative to phosphoric acid. Theshear bond strength value obtained was above the minimum of theclinically accepted for orthodontic use.
crystal growth
Shear bond strength
residual adhesive
orthodontic brackets
2010
12
01
93
106
https://eos.journals.ekb.eg/article_79025_bf34bcc2734c28360023bfd6fdeb11f4.pdf
Egyptian Orthodontic Journal
1110-435X
1110-435X
2010
38
December 2010
Effect of hyperbaric oxygen mobility of orthodontically treated teeth
Hany
Eid
Waleed
El Sayed
Objectives: The present study was designed to investigate theeffect of hyperbaric oxygen therapy (HBOT) on improving tooth mobilityduring orthodontic treatment using a Periotest. Methods: Twentyorthodontic cases (n=20) without severe skeletal discrepancies wereused as subjects. For each subject, the mobility of the central andlateral incisors on both arches (U1, U2, L1, and L2) was measuredimmediately before orthodontic treatment (T1), after 12 months oftreatment (T2), and after 3 months from T2 stage (T3) by use of aPeriotest. The sample was randomly divided into two groups (n=10).The first group was administered HBO for 60 minutes, at 2.5 ATA(atmospheres absolute) for five consecutive days immediately afterT2 stage, and the second group served as a control. For bothgroups the mean values of T1 stages were calculated and comparedto those of T2 and T3 stages in the same group. Results: At T2 andT3 stages, the periotest mean values have increased for all the teethin the second group without HBOT in comparison with those atT1 stage in the same group. However, in the first group that hasbeen given HBOT, the mean values have significantly increased atT2 stage compared with those at T1 stage, but the mean values atT3 stage have significantly decreased compared with those at T2stage in the same group. Conclusions: It is suggested that hyperbaric
oxygen therapy (HBOT) may be useful in reducing tooth mobilitynoticed during and after orthodontic treatment.
hyperbaric oxygen therapy
orthodontic tooth movement
periostat
mobility
2010
12
01
107
124
https://eos.journals.ekb.eg/article_79029_b1087ffdf5a76e64b7bfe8ad76098fbd.pdf