@article { author = {Marzouk, Eiman and EL Kalza, Ahmed}, title = {Three dimensional evaluation of pharyngeal airway changes associated with maxillary incisors proclination in class II division 2 using cone-beam computed tomography}, journal = {Egyptian Orthodontic Journal}, volume = {45}, number = {June 2014}, pages = {1-18}, year = {2014}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2014.78740}, abstract = {Objective: To evaluate whether the correction of the axial inclination of retroclined maxillary incisors in Class II division 2 cases might affect the pharyngeal airway size and volume using Cone-Beam Computed Tomography (CBCT) and the Invivo Dental software (Anatomage). Materials and Methods: Eighteen adult male Class II division 2 subjects were enrolled in this study (mean age 23.83 ± 3.67 years). Two CBCT scans were obtained for each subject; pretreatment and after completion of the maxillary arch leveling only. The pretreatment and post-leveling pharyngeal air way mean values (size and volume) were compared using the paired sample t-test. Results: The results showed statistically significant increase (P90.05) in all oropharyngeal airway measurements following maxillary dental arch leveling. There has been 9.53% ±1.45% raise in the oropharygeal airway volume. In addition the analyses of the pretreatment and post-leveling mandibular measurements revealed high statistically significant changes (P9 0.001) as follows: SNB angle increased, and FH-Mn Pl and Y axis-FH angles decreased, following the leveling of upper anteriors. Conclusion: The correction of the maxillary incisors inclination in Class II division 2 subjects improved the pharyngeal airway size and volume. This might be attributed to the anterior mandibular repositioning following the correction of upper incisors retroclination. These findings are of valuable clinical importance, especially in cases of Class II division 2 with breathing problems due to pharyngeal constrictions.}, keywords = {Airway,Class II Division 2,CBCT}, url = {https://eos.journals.ekb.eg/article_78740.html}, eprint = {https://eos.journals.ekb.eg/article_78740_229281f297935aa632d3302be9ba9fa4.pdf} } @article { author = {Negm, Ibrahim and Aboulazm, Khaled}, title = {Reliability of CBCT digital models in measurement of the curve of Spee}, journal = {Egyptian Orthodontic Journal}, volume = {45}, number = {June 2014}, pages = {19-34}, year = {2014}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2014.78744}, abstract = {Introduction: Study models are an essential part of an orthodontic record. Digital models are now available. Thus the aim of this study is to compare the reliability of measuring the curve of spee on plaster study models and CBCT digital models. Methods: The study consisted of twenty subjects their ages ranged from 17 to 25 years. The subjects were patients seeking orthodontic treatment at the Department of Orthodontics, Faculty of Dentistry, Ain Shams University. All subjects had upper and lower alginate impressions in addition to CBCT taken prior treatment. The curve of spee was measured on both the study models and the CBCT models. Results: The results showed strong agreement in most measurements between the conventional method (plaster model) and the digital method (CBCT model) the correlation coefficients (Pearson’s r) for the curve of spee in both methods was (0.992). Correlation was significant at the 0.01 level (2-tailed). Conclusion: Excellent agreement between the measurements for the curve of spee with the plaster study model and digital model was found; CBCT digital models can be an alternative to plaster study models.}, keywords = {CBCT,Digital models,Curve of Spee}, url = {https://eos.journals.ekb.eg/article_78744.html}, eprint = {https://eos.journals.ekb.eg/article_78744_f037ac090d250a92d07addd1cb6a1667.pdf} } @article { author = {Elhiny, Omnia}, title = {Prevalence of gummy smile in a sample of Egyptian population and laymen perception of its attractiveness}, journal = {Egyptian Orthodontic Journal}, volume = {45}, number = {June 2014}, pages = {35-42}, year = {2014}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2014.78747}, abstract = {Aim of the study: this study aims at evaluating the prevalence of gummy smile in a sample of Egyptian population and the perception of Laymen of the attractiveness of that smile. Materials and methods: 346 volunteer students were randomly selected of age range 17-25 years. They were asked to smile in a posed fashion and the amount of gingival display, if any, was measured. Standardized digital photographs were taken for the students who had gummy smile and then they were shown to a panel of 100 laymen. The laymen judged the attractiveness of the smile on a visual analogue scale. Results: 11.8% of the sample had gummy smile with a mean of 1.0mm, 68.3% of them were females. 24.4% of the gummy smiles were judged as attractive and 63% of the judges considered them as attractive. Conclusion: gummy smile is not prevalent among Egyptians and contrary to a previous belief is perceived as attractive among laymen. Orthodontists must modify their treatment plans to better serve trending beauty demands.}, keywords = {gummy smile,gingival smile,gingival display,smile esthetics}, url = {https://eos.journals.ekb.eg/article_78747.html}, eprint = {https://eos.journals.ekb.eg/article_78747_0827238cb4ccc13696fcf4f5043de3e9.pdf} } @article { author = {Atteya, Mohamed and El-kadi, Abbadi and Refaat, Waleed}, title = {Accuracy and reliability of orthodontic dental measurements using different methods}, journal = {Egyptian Orthodontic Journal}, volume = {45}, number = {June 2014}, pages = {43-62}, year = {2014}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2014.78891}, abstract = {Objective: to compare the accuracy and reliability of orthodontic dental measurements obtained from CBCT models, digital models and conventional plaster models. Material and methods: The sample consisted of plaster dental models of 30 orthodontic subjects. Dental arch measurements, including mesiodistal widths of teeth and arch widths. Were made with the calipers. The patients were also scanned with CBCT, and measurements were made digitally on a 3-dimensional based dental measurements software (On Demand 3D, Cypermed, Seoul, Korea), Plaster models were scanned with a digital scanner (Canon Pixma MX300, Canon, USA) and measurements were made digitally on Onyx Ceph. Software (Ver. 2.7.18, OnyxCeph, Chemnitz, Germany). Results: For the accuracy evaluation, statistically significant differences were found between conventional models and CBCT models for mesiodistal widths of maxillary right canine, right first molar, left first premolar, left second premolar and left first molar, mandibular right second premolar, left first and premolar, mandibular inter-canine width. Also Statistically significant differences were found between conventional models and digitally scanned models for most mesiodistal teeth widths. However, the mean differences between the measurements were ranging from -0.222 – 0.211 mm which is not clinically significant. For reliability evaluation results showed excellent agreement for the three methods between measurements made at three different time intervals. Conclusion: Digital CBCT models and digitally scanned plaster models used in this study are as accurate as conventional models and can be a good alternative. The three methods used in this study are highly reliable.}, keywords = {CBCT,Mesio-distal teeth width,Arch width}, url = {https://eos.journals.ekb.eg/article_78891.html}, eprint = {https://eos.journals.ekb.eg/article_78891_e48c2e1b52723b8fd19cf349815ed4a3.pdf} } @article { author = {Negm, Ibrahim and Aboulazm, Khaled}, title = {Comparison between the effect of air-abrasion before and after conventional acid etching on the shear bond strength}, journal = {Egyptian Orthodontic Journal}, volume = {45}, number = {June 2014}, pages = {63-74}, year = {2014}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2014.78892}, abstract = {Introduction: Recently, air-abrasion technology has been examined for potential applications within the field of orthodontics as an alternate method of enamel surface treatment especially with the introduction of intraoral sand blasters. Therefore, the aim of this study was to compare the effect of sandblasting of enamel before and after conventional acid-etch bond technique on the shear bond strength. Methods: the study consisted of sixty freshly extracted human premolars that were equally and randomly divided into two groups (A and B). In group A the enamel surface treatment involved sandblasting followed by acid etching, while in group B enamel surface treatment involved acid etching followed by sandblasting. Shear bond strength was tested by Instron universal testing machine in shear mode until bond failure and recorded in Newtons then converted into MPa. The mean results for shear bond strengths in group A were 12.31 MPa while those for group B were 10.35 MPa and the P-value was 0.02*. Conclusion sandblasting followed by acid etching resulted in the highest shear bond strength; while acid etching followed by sandblasting resulted in statistically significant lower shear bond strength although it is still clinically acceptable.}, keywords = {Air-abrasion,acid etching,Shear bond strength}, url = {https://eos.journals.ekb.eg/article_78892.html}, eprint = {https://eos.journals.ekb.eg/article_78892_25d689542bee208aa2386f3a8a2c760d.pdf} }