Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
Effect of extraction technique on the rate of canine retraction: a split-mouth study
1
8
EN
Tarek
Yousry
Lecturer, Department of Orthodontics, Alexandria University, Egypt
Ahmed
Sweedan
Lecturer, Department of Oral and Maxillofacial surgery, Alexandria University, Egypt
10.21608/eos.2019.77623
Abstract:<br />The method of tooth extraction may affect amount of bone and thus may affect orthodontic tooth movement.<br />Materials and Methods:This study is a split mouth clinical trial. A total of 14 female patients were enrolled in the study. Following the leveling and alignment stage, the patient was sent for extraction either with conventional forceps way for one side and the other side with the aid of the Piezotome.<br />Results:The average rate of canine retraction for the four months of the study and the total amount of canine retraction weren’t significant. Regarding marginal bone loss,in control side (forceps extraction side) mean marginal bone loss was found to be 0.07 mm (+_ 0.1). In the piezotome side mean marginal bone loss was found to be 5.8 mm (0.23).The difference between two sides was statistically significant (p<0.05).<br />Conclusions:The method of teeth extraction didn’t affect the rate of canine retraction into the extraction socket. Piezotome was believed to produce more atraumatic extraction, however the amount of marginal bone loss was significantly greater compared to the conventional forceps extraction method.
https://eos.journals.ekb.eg/article_77623.html
https://eos.journals.ekb.eg/article_77623_7473e515d88590df19411b6fa6a6621f.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
Evaluation of the shear bond strength of ceramic orthodontic brackets to glazed monolithic zirconia using different bonding protocols
9
20
EN
Youmna
Douara
Deparment of Orthodontics, Faculty of Dentistry, Alexandria University, Egypt
Sally
Abdul Kader
Department of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Egypt
Hassan
Kassem
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Egypt
Mohamed
Mowafy
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Egypt
mo_mowafy@hotmail.com
10.21608/eos.2019.77627
Abstract<br />AIM: The aim of this study was to evaluate the shear bond strength (SBS) of ceramic brackets to glazed monolithic zirconia using three different bonding protocols.<br />MATERIALS AND METHODS: Forty-five monolithic glazed zirconia embedded into acrylic resin were randomly assigned to 3 groups (n = 15) following air abrasion by 50 μm aluminum oxide particles, the groups were treated with: (A) Assure Plus, (B) Silane + Assure Plus (C) Hydrofluoric acid + Silane + Transbond XT primer. Ceramic brackets were bonded to the zirconia discs using Transbond XT. Following thermocycling (500 cycles, 5° - 55° C), SBS, failure mode and Adhesive Remnant Index were assessed.<br />RESULTS:Group C showed the highest SBS followed by Group B with no statistically significant difference. Most of the specimens in Group C showed an adhesive failure between the bracket base and the adhesive, whereas Group B presented mainly a mixed cohesive adhesive failure. SBS in Group A was significantly lower than either groups showing an adhesive failure at the zirconia- adhesive interface.<br />CONCLUSIONS: Both Assure Plus + Silane and the classical ceramic bonding protocol achieved clinically acceptable SBS of ceramic brackets bonded to glazed zirconia. However, Assure Plus + Silane achieved better debonding characteristics.
https://eos.journals.ekb.eg/article_77627.html
https://eos.journals.ekb.eg/article_77627_e8c1f330405578d58790d8f48ba29f74.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
Evaluation of the efficacy of Regenamel in the treatment of white spot lesions: an in vitro study
21
29
EN
Karim
Hany
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Nagwa
Enany
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
nagwaenany@yahoo.com
Ahmed
Elkalza
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
10.21608/eos.2019.77630
ABSTRACT:<br />Objective: The aim of this study was to evaluate the efficacy of REGENAMEL® on white spot lesions (WSLs)in terms of the extent of color change and the degree of mineralization.Materials and methods: Artificial white spot lesions were induced in 40 extracted human premolars, divided into a test and a control groups. REGENAMEL® was applied to the test group according to manufacturer's instructions, while the control group received no treatment. Both groups were incubated in remineralizing solution for 90 days at 37 °C. Specimens were evaluated using VITA Easyshade advance spectrophotometer at baseline (E0), after WSLs induction (E1) and 90 days following treatment (E2).DIAGNOdent evaluation was done After WSLs induction (D1) and at the end of incubation period (D2). Results: The Data was collected and statistical analyses were done using Statistical Package for Social Sciences (SPSS).No significant difference between groups was found after formation of WSLs ΔE (T0 - T1). Meanwhile significant difference was present between the two groups when comparing the color change after 90 days (T2-T1). ΔE values were 8.2 ± 4.81 and 1.92 ± 1.21 for the test and control groups respectively. Despite the final outcome showed marked improvement when compared to the baseline readings (T2-T0) 4.94 ± 3.66, the final color of the lesions was still not matching the baseline color. For the DIAGNOdent readings, at T1 the mean value for the test group was 15.55 ± 3.81 while that of the control group was 14.95 ± 2.16. At T2, for the test group, all specimens showed significantly decreased fluorescence values towards the values of sound dental tissues with mean value of 9.9 ± 1.94. The fluorescence values for the control group at T2 showed minimal change with mean value of 13.65 ± 2.03. Conclusion: REGENAMEL® is effective in improving the color of WSLs and remineralization of demineralized enamel surface.
Orthodontics,White spot lesions,REGENAMEL®,Spectrophotometer,DIAGNOdent
https://eos.journals.ekb.eg/article_77630.html
https://eos.journals.ekb.eg/article_77630_8267b56ed9466a223bdf1a207b32136b.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
Management of white spot lesions using resin infiltration and microabrasion: a comparative in vitro study.
30
38
EN
Dina
Abd Elkader
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Hanan
Ismail
0000 0002 2685 7075
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
hananaminismail@gmail.com
Mohamed
Mowafy
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
mo_mowafy@hotmail.com
Moustafa
Abousheleib
Department of Biomaterials, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
10.21608/eos.2019.77633
ABSTRACT<br />Study objective: White spot lesions are unwelcomed side effects of fixed appliances that compromise the treatment outcome. Recently the infiltration of white spot lesions has been introduced as a viable treatment alternative and the objective is to evaluate the colour improvement, stability against discolouration and abrasion resistance following resin infiltration and resin infiltration following Microabrasion..<br />Materials and methods: This study design is an in vitro prospective study that included 45 teeth extracted for orthodontic purposes. Artificial white spot lesions were created in the enamel and teeth were randomly allocated to three groups, then the teeth were treated with infiltration (Icon) and infiltration following Microabrasion (Opalustre) or remained untreated (control). The three groups were then subjected to Thermocycling, tooth brush abrasion and discolouration then visible colour change and abrasion resistance were measured.<br />Results:When ΔE was calculated between the baseline measurements and those after white spot lesions there was a clinical and statistical color change in the three groups, in group II (the combined treatment group) the calculated ΔE between baseline measurements and those taken after treatment and after aging the mean color difference was less than that in group III (only resin infiltration group). Under SEM after aging all the treated surfaces of the specimens in group II were smooth with no microcracks while in group III the treated surfaces showed smooth areas and other areas showed microfissures and microcracks.<br />Conclusions:When microabrasion preceded resin infiltration in the treatment of WSLs, it improved the color matching immediately after treatment application and showed better performance after aging procedures. It also produced smooth surface free from microcracks under SEM.
Microabrasion,Opalustre,Resin infiltration,Icon,CIELAB color analysis,Spectrophotometry,SEM,thermocycling,Mechanical abrasion
https://eos.journals.ekb.eg/article_77633.html
https://eos.journals.ekb.eg/article_77633_4d11b3876cdc9135ab7d8151a647fc14.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
Comparative evaluation of failure of three different aged orthodontic bonded retainers related to vertical load: in vitro study
39
50
EN
Mayada
ElSorogy
Orthodontic Department, Alexandria University, Alexandria, Egypt
Seham
Hanafy
Dental Biomaterials, Alexandria University, Alexandria, Egypt
Tarek
Yousry
Orthodontic Department, Alexandria University, Alexandria, Egypt
Abbas
Zaher
Orthodontic Department, Alexandria University, Alexandria, Egypt
10.21608/eos.2019.77636
Abstract<br />Introduction:Failure of orthodontic bonded retainers may affect the orthodontic results and cause relapse.<br />Objectives:To compare in vitro the effect of vertical load on failure of three different bonded lingual retainers:Flat braided wire “Bond A. Braid”, Dead soft wire “RESPOND”, Fiber reinforced composite “Infibra Ribbon”. Bonded with Tetric-N Flowadhesive system.<br />Materials and Methods:Ninetymandibular incisors were used in the study, thirty specimens (N=30) in triads divided into 3 groups (n=10 for each group). Roots of the incisors were covered with elastomeric impression material to mimic periodontal ligaments elasticity and embedded in triads in acrylic resin blocks. They were randomly divided into 3 groups to receive the following retainer wire materials:Group A (Flat braided wire “Bond A. Braid”), Group B (Dead soft wire “RESPOND”), and Group C (Fiber reinforced composite “Infibra Ribbon”). And these retainer wires were bonded to the lingual surfaces using Tetric-N Flowadhesive system.The three groups were subjected to 10,000 thermal cycles between 55▫C & 5▫C using a thermo-cycling machine. Each specimen was subjected to loading forces at the incisal edge of the middle incisor for 125,000 cycles. Then failure forces were measured using a Universal Testing Machine at a cross head speed (1mm/min) applied on the wire of the interproximal segments.Failure sites were determined and the adhesive remnant index (ARI) was observed using a stereomicroscope at (×20) magnification.<br />Results:Mean debonding forces were 46.27 ±<br />12.28, 36.03 ± 6.09, 30.09 ± 15.73 N for Groups A,B and C respectively, presenting significant difference between the groups (p < 0.05). The highest value for the mean force was found for the Bond-A-Braid (group A) and the lowest value for the mean force was found for the FRC (group C). There was no statistically significant difference in displacement among test groups. There was no fracture occurred of any wire. There was no significant difference between the distribution of the ARI score between the three groups (p=0.322).The ARI scores were observed under the optical stereomicroscope showing multiple failures at the composite-wire interface and the tooth-composite interface.<br />Conclusions: There was a significant difference between “Bond A. Braid” wire and “FRC” where “Bond A. Braid” had the highest debonding forces and the “FRC” had the lowest debonding forces. There was no significant difference in displacement of the retainers between the three groups. There was no significant difference between the ARI of the lingual retainer systems and types of failure as well.
retainer,retention,wire,bonding,lingual,aging,relapse
https://eos.journals.ekb.eg/article_77636.html
https://eos.journals.ekb.eg/article_77636_a6cc4eee7d28e3729913e64ecb4983c8.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
56
December 2019
2019
12
01
TOOTH COLOR UNIFORMITY FOLLOWING WHITE SPOT LESION TREATMENT WITH RESIN INFILTRATION OR BLEACHING IN VITRO STUDY
51
60
EN
Heba
Sawaf
Resident, Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
hebasawaf@hotmail.com
Hassan
E.
Kassem
Lecturer, Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Nagwa
M.
Enany
Professor, Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
nagwaenany@yahoo.com
10.21608/eos.2019.152609
<strong>Background</strong>: Resin infiltration and bleaching have been used as minimally invasive methods for the treatment of white spot lesions (WSLs) following orthodontic treatment.<br /><strong>Objective</strong>: To compare the color uniformity of the tooth with WSL treated with either resin infiltration or bleaching.<br /><strong>Material and Methods</strong>: WSLs were created in the right middle buccal half of the enamel surface of 40 sound extracted human premolars. The teeth were randomly assigned to 2 groups (n = 20) treated with: (I) resin infiltration, (II) chemically activated office-bleaching. Color parameter of the lesion and the adjacent enamel were measured by spectrophotometer at 3 time points: baseline (T0), after WSL formation (T1), after treatment (T2) and color difference ΔE* was calculated. Each tooth was visually scored for color homogeneity.<br /><strong>Results</strong>: ΔE* was significantly smaller after treatment in group I compared to group II [mean difference = 5.03 ± 1.11, P <0.0001]. Group II showed a statistically significant difference after treatment compared to baseline (P < 0.0001), whereas group I did not (P = 1.00). The visual score showed that the tooth color in group I had two-fold chance to be uniform in color compared to group II [Odds ratio = 2.00, P < 0.01]<br /><strong>Conclusions</strong>: Treatment of WSLs with resin infiltration result in a more uniform tooth color was achieved compared to bleaching.
White spot lesion,office bleaching,Color,Resin infiltration,Icon
https://eos.journals.ekb.eg/article_152609.html
https://eos.journals.ekb.eg/article_152609_f7b46968e272c5c7940ab2977273f66d.pdf