Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
22
Orthodontically induced root resorption in maxillary first molar during canine retraction on mini-implant
1
17
EN
Ibrahim
Negm
Department of Orthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
Khaled
Aboulazm
Department of Orthodontics, Faculty Dentistry, Pharos University, Alexandria, Egypt.
10.21608/eos.2015.78724
Objective: The aim of this study was to compare between the<br />incidence of orthodontically induced root resorption (OIRR) of<br />maxillary first molar during canine retraction utilizing<br />conventional sliding mechanics and mini-implants assisted<br />mechanics. Methods: The sample in this study consisted of 20<br />subjects, which were randomly and equally divided into two<br />groups: group A; Conventional sliding mechanics group consisted<br />of 10 subjects (7 males and 3 females) and group B; Mini-implant assisted mechanics group consisted of 10 subjects (5 males and 5 females). CBCT were taken before treatment and after canine retraction to evaluate the degree of OIRR. Paired t-test and ANOVA were used to compare the extent of OIRR in both groups and between the mesiobuccal, distobuccal, and palatal roots within each group pretreatment and post-retraction. Results: Displayed a statistically significant increase in OIRR of maxillary first molar with conventional sliding mechanics (P-value <0.001) and mesiobuccal root exhibited the highest degree of OIRR and the palatal root had the lowest OIRR within both groups. Conclusion: Mini-implant assisted mechanics during canine retraction decreases the amount of OIRR in the maxillary first molars thanimplementing conventional sliding mechanics.
https://eos.journals.ekb.eg/article_78724.html
https://eos.journals.ekb.eg/article_78724_15e2ed6e98c49fedfcf4d8b073c31eb9.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
20
Miniscrews supported maxillary en-masse retraction with and without palatal corticotomy
19
33
EN
Walaa
El.Gemeay
Department of Orthodontics, Faculty of Dentistry, Suez Canal University.
Mohamed
Nadim
Department of Orthodontics, Faculty of Dentistry, Suez Canal University.
Tamer
Hamed
Department of Oral and Maxillofacial Surgery, Faculty of Dentistry,
Suez Canal University.
Tamer
Bedair
Department of orthodontics, Faculty of Dentistry, Suez Canal University.
Abbadi
El-Kadi
Department of Orthodontics, Faculty of Dentistry, Suez Canal University
10.21608/eos.2015.78725
The purpose of this study was to evaluate miniscrew<br />supported maxillary en masse retraction with and without<br />corticotomy-facilitated orthodontics. Twenty patients with maxillary or bimaxillary protrusion requiring orthodontic treatment with upper anterior en masse retraction in the extraction space of first premolars were selected. Patients were divided into two groups; control and corticotomy group each group consisted of 10 subjects. The retraction time was estimated .The cephalometric radiographs were analyzed for differences between pre-treatment and post-treatment variables that included skeletal and dental relationships. There was a significant difference in retraction time between control and corticotomy groups (p<0.001). Radiographic evaluation showed significant maxillary incisor retraction. Cortictomy assisted orthodontics reduces the duration of treatment compared to that without corticotomy.
https://eos.journals.ekb.eg/article_78725.html
https://eos.journals.ekb.eg/article_78725_38af0f3b2d0ade616d4c6d7197a9574d.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
20
The use of three recycling methods for rebonding of ceramic brackets
35
53
EN
Mohamed
Yousef
Orthodontics department, Faculty of Dentistry, Alexandria University
Hanan
Ismail
0000 0002 2685 7075
Orthodontics department, Faculty of Dentistry, Alexandria University
hananaminismail@gmail.com
Eiman
Marzouk
Orthodontics department, Faculty of Dentistry, Alexandria University
Mostafa
Shelib
Biomaterial, Faculty of Dentistry, Alexandria University
10.21608/eos.2015.78726
Objective: The aim of this study was to compare the<br />effect of three recycling methods – Tribochemical silica coating<br />combined with silane, conventional sandblasting combined with<br />silane, and heat application combined with silane – on the shear<br />bond strength of rebonded ceramic bracket compared to newly<br />bonded brackets. Materials and Methods: Sixty chemically<br />retentive ceramic bracket (inspire ICE) were divided into four<br />groups (15 in each group): Control new brackets (without silane),<br />sandblasting using 50 2m aluminum oxide + silane, sandblasting<br />using 302m silica coated aluminum oxide (Tribochemical silica) and heat treatment + silane. All brackets were thermocycled 5000 times between 5 ºC and 55ºC. Shear force was applied to the enamel-adhesive interface until debonding. Results: The highest bond strength was found in the heat + silane group and the new control brackets (19.5 and 19.2 MPa, respectively) followed by the silica coated aluminum oxide + silane (11.8 MPa). Recycling using 50 2m aluminum oxide + silane resulted in significantly low bond strength (1.5 MPa). Conclusion: No significant difference in the SBS between heat treated group followed by silane application and 302m silica coated sandblasted group. Reconditioning with 302m silica coated sandblast is a promising method as it is chair-side time-effective and show good comparable SBS to that of new brackets.
https://eos.journals.ekb.eg/article_78726.html
https://eos.journals.ekb.eg/article_78726_f28034b22bb4f9d07d260b92cf2a273c.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
20
Effect of different bonding techniques on the debonding characteristics of ceramic brackets
55
65
EN
Moustafa
Tageldin
Orthodontics department, Faculty of Dentistry, Alexandria University
Hanan
Ismail
0000 0002 2685 7075
Orthodontics department, Faculty of Dentistry, Alexandria University
hananaminismail@gmail.com
Mohamed
Mowafy
Orthodontics department, Faculty of Dentistry, Alexandria University
mo_mowafy@hotmail.com
10.21608/eos.2015.78727
Objective: To evaluate and compare shear bond strength and<br />debonding characteristics of ceramic brackets using different<br />bonding techniques. Materials and Methods: Ninety six premolar<br />teeth were randomly divided into six groups: 1) Transbond XT<br />with 5 seconds etch, 2) Transbond XT with 15 seconds etch,<br />3) Transbond XT with Transbond Plus Self – Etching Primer,<br />4) Vertise Flow with 5 seconds etch, 5) Vertise Flow with<br />15 seconds etch, 6) Vertise Flow with Transbond Plus<br />Self–Etching Primer. In each group 16 bracketed teeth with<br />Inspire Ice bracket, 8 of which were debonded by universal testing machine to determine the shear bond strength. The other 8 ceramic brackets were removed with plastic debonding plier. All teeth were examined under a stereomicroscope, the adhesive remnant index and bracket fracture were assessed. Results: The mean SBS for group I to VI was (1.78 ± 0.78, 14.5 ± 5, 12.52 ± 3.69, 4.15 ± 2.35, 13.26 ± 4.46, 6.78 ± 3.51,) MPa respectively. Bracket fractures were noted in 10 out of 48 samples after debonding with plier. Groups II and V exhibited the higest SBS and the highest ratio of bracket fracture. Conclusion: Using 15 seconds etching with either Transbond XT or Vertise Flow gave acceptable SBS. Self-etching primer gave lower SBS but within the acceptable clinical range. Decreasing etching time to 5 seconds didn’t give clinically acceptable SBS
https://eos.journals.ekb.eg/article_78727.html
https://eos.journals.ekb.eg/article_78727_2a7a1f12dd6b741b7c4d05fab8e05633.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
20
Evaluation of craniofacial growth changes in subjects with class II and class III malocclusions during the circum-pubertal period
67
92
EN
Sara
El-Kabbany
Orthodontics, Faculty of Dental Medicine (For Girls), Al-Azhar
University;
Samir
Ibrahim
Orthodontic Department, Faculty of Dental Medicine
(For Girls), Al-Azhar University.
Ahmed
Salama
Orthodontics, Faculty of Dental Medicine (For Girls), Al-Azhar University.
Sheldon
Baumrind
Orthodontics, Director of Craniofacial Research Instrumentation Lab,
University of the Pacific School of Dentistry, San Francisco, CA, USA.
10.21608/eos.2015.78728
The issue of craniofacial growth has become more relevant because of the increasing interest in optimizing treatment timing in dentofacial orthopedics. Objective: The purpose of this study was to evaluate craniofacial growth changes in skeletal Class II and Class III subjects in comparison with an age and sex matched control group with normal dentoskeletal pattern. Materials and Methods: The sample was randomly collected from the files of the American Association of Orthodontists Foundation Legacy Collection (AAOF). The final sample consisted of 170 subjects; 75 skeletal Class II subjects (33 females and 42 males), 15 skeletal Class III subjects (5 females and 10 males) and 80 control subjects (38females and 42 males) with chronologic ages from 8 to 18 years old. The digital cephalometric radiographs were traced with replication using special software developed at the Craniofacial Research Instrumentation Laboratory. Cephalometric analysis of twenty skeletal and dental variables was performed. The stages in cervical vertebral maturation (CVM) were recorded from cephalometric records of Class II subjects. Results: 1) Most dentofacial measures in Class II subjects were similar to control group, with the exception of significant mandibular retrusion, higher value of wits appraisal and ANB angle, distal molar relationship, greater skeletal convexity and deficiency in mandibular length. 2) Relative to controls, Class III subjects displayed smaller anterior cranial base length, similar cranial base angle, shorter maxilla, more prominent mandible, and increases in lower anterior facial height. 3) Most of the angular and linear measurements showed no significant sex difference in Class II group. In contrast, presence of a sexual dimorphism was evident in Class III group. Conclusion: 1. The skeletal and dental components of Class II and Class III malocclusion were evident early and didn’t tend to self- correct with growth. 2. In Class II group, the adolescent growth spurt in mandibular length occurred at 12 to 13yrs of age in females and 13 to 14yrs of age in males. In both sexes, the mandibular growth peak occurred between cervical vertebral stages three and four (CS3-CS4). 3. The peak of mandibular growth in Class III group showed a later onset, longer duration, and larger amount than controls. There was a significant increase in mandibular length in Class III subjects from about 11 in females and 14 in males through 16 years of age.
https://eos.journals.ekb.eg/article_78728.html
https://eos.journals.ekb.eg/article_78728_6316f7dfc01f3c2edcdf1d2715c9dfa1.pdf
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
2812-5258
47
June 2015
2015
06
20
Comparison of labial corticotomy vs palatal corticotomy during en masse retraction with mini screws as anchorage units
93
103
EN
Walaa
El.Gemeay
Department of Orthodontics, Faculty of Dentistry, Suez Canal University
Mohamed
Nadim
Department of Orthodontics, Faculty of Dentistry, Suez Canal University
Tamer
Hamed
Department of Oral and Maxillofacial Surgery, Faculty of Dentistry,
Suez Canal University.
Tamer
Bedair
Department of orthodontics, Faculty of Dentistry, Suez Canal University
Abbadi
EL-Kadi
Department of Orthodontics, Faculty of Dentistry, Suez Canal University
10.21608/eos.2015.78729
Aim: The aim of this study was to evaluate and compare the treatment effects and duration of en-masse retraction combined with labial corticotomy and that with palatal corticotomy using miniscrews as source of anchorage. Methods: Twenty adult patients with bimaxillary or maxillary protrusion requiring orthodontic treatment with upper anterior retraction in the extraction space of first premolars were selected. Patients were divided into two groups; labial corticotomy gruop and palatal corticotomy group, each group consisted of 10 subjects. The retraction time was estimated. Cephalometric radiographs were taken before treatment (T1) and after treatment (T2). Results: There was no significant difference in retraction time between labial and palatal corticotomy groups. Radiographic evaluation showed significant maxillary incisor retraction. Conclusion: The use of corticotomy technique from labial side only could be beneficial for adult patients with difficult surgical access from the palatal side.
https://eos.journals.ekb.eg/article_78729.html
https://eos.journals.ekb.eg/article_78729_29bcadb68d412ad1e8175171d68f66db.pdf