@article { author = {Farrag, Nadia and Awad, Salwa}, title = {Comparison of study model and digital panoramic radiograph in estimating tooth size and arch length in children}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {1-13}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78769}, abstract = {amount of space required for the alignment of unerupted permanent teeth in the dental arch. Objective: This study was conducted to compare betw Objective: een the use of study model and digital panoramic radiograph with special computer software program in estimating tooth size and arch length in children. Study design: Study models and digital panoramic ra Study design: diographs with 1:1 magnification factor of one hundred 8-9years old children (50 boys and 50girls) were obtained. On the model, the mesiodistal tooth size of lower and upper permanent central and lateral incisors were measured with an accurate sliding digital micrometer caliper. Upper and lower arch lengths were also measured from the mesial surface of the first permanent molar in one side of the arch to the mesial surface of the contra lateral side using 0.25 inch stainless steel wire. These measurements were then compared to that obtained from the digital panoramic radiograph using special soft ware program (AUTOCAD 2010). The sum of the mesiodistal dimensions of the four permanent mandibular incisors recorded from the models were used to predict the combined sizes of the unerupted canines and premolars using Moyers, method (at 95% evel of probability). These predicted measurements of unerupted canines and premolars were compared to that measured from the digital panoramic radiographs using (AUTOCAD 2010) program. Results: No statistical significant difference was Results: observed between study model and digital panoramic radiograph with 1:1 magnification factor in estimating tooth size and arch length in children of the present study. Conclusion: Using 1:1 magnification digital panoram Conclusion: ic radiograph with special software computer program is an applicable, accurate and effective method for estimating tooth size and arch length.}, keywords = {Panoramic radiogrpah,study cast,accuracy,tooth size,arch length}, url = {https://eos.journals.ekb.eg/article_78769.html}, eprint = {https://eos.journals.ekb.eg/article_78769_7c197f92b7d1f78d8d09e7ff280e6ab0.pdf} } @article { author = {Al Hadithy, Saba and Attia, Khaled and El Dakroury, Amr}, title = {Accuracy of cone beam-derived lateral cephalometric radiographs}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {25-35}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78767}, abstract = {The aim of the present study is to compare the accuracy of linear measurements derived from conventional lateral cephalograms (CLC) versus cephalometric images derived from cone beam CT (CBLC). The sample consisted of 10 edentulous dry skulls. Fifteen anatomical landmarks; of which 4 bilateral; were marked on each skull using metallic markers. The distances between these landmarks provided 8 linear measurements commonly used in lateral cephalometric analyses. The skulls were imaged using two techniques, lateral cephalometric radiograph and cone beam computed tomography. Using the OsiriX®* computer program, 8 linear measurements were measured on the CLC and the CBLC. These measurements were compared with one’s made directly on the skull. The results of this study showed that cephalometric measurement obtained from CBLC images are more representative to the anatomical truth.}, keywords = {cone beam,radiograph,lateral cephalometric}, url = {https://eos.journals.ekb.eg/article_78767.html}, eprint = {} } @article { author = {Nassar, Essam and Garawish, Mohamed and Karrouf, Gamal}, title = {Influence of mycophenolate mofetil and sirolimus immunosuppresive drugs on orthodontic dogs tooth movement}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {38-51}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78774}, abstract = {Introduction: The purpose of this study was aimed t Introduction: o evaluate the effects of administering two immunosuppressive drugs, mycophenolate mofetil and sirolimus on orthodontic tooth movement in dogs. Methods: Fifteen adult healthy dogs were equally di Methods: vided into three groups, group1, the control did not receive any drugs while dogs in groups 2 and 3 received mycophenolate mofetil and sirolimus, respectively. A 100 gm force was applied to the left and right sides of the maxillae in all groups using nickel titanium coil spring attached to the lateral incisors and canines for 42 days. Tooth movement was assessed by measuring differences in the distance between the lateral incisors and canines on days 0 and 42. At day 42, the dogs were euthanized and the maxillae were dissected, teeth and the surrounding alveolar bone were processed for histological examination. Results: Histological results showed newly formed b Results: one at the tension side of the control group while the pattern of bone resorption seen at the pressure side indicated the presence of front and direct bone resorption. Less bone deposition and resorption were observed at the tension and compression sides in mycophenolate mofetil treated dogs while in the tension side of sirolimus treated dogs, little or no bone apposition was present and similarly, little or no bone desorption was observed at compression sides. Moreover, there was a statistically significant difference between the tooth movement among the three groups at day 42 (p<0.001). Within each group, there was a significant difference between tooth movement at days 0 and 42 in groups 1 and 2 (p=0.05) but group 3 showed no significant difference (p>0.05) Conclusions: Both mycophenolate mofetil and SLR sig Conclusions: nificantly altered orthodontic tooth movement; however mycophenolate mofetil seems to be less disruptive than sirolimus to the pattern of orthodontic tooth movement.}, keywords = {mycophenolate mofetil,sirolimus,immunosuppressive drugs,orthodontic tooth movement,dogs}, url = {https://eos.journals.ekb.eg/article_78774.html}, eprint = {https://eos.journals.ekb.eg/article_78774_62f35547b22a935816afd39411a1cafc.pdf} } @article { author = {Fouda, Maher and Al-Belasy, Fouad and Abd El Nabi, Shaza and Shamaa, Marwa}, title = {Implant versus Nance holding arch anchorage during maxillary canine retraction}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {53-65}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78789}, abstract = {The aim of the present work is to determine the anchorage potential of titanium microimplant for maxillary canine retraction and to measure the anchorage loss using microscrew implants compared to Nance holding arch as intraoral anchorage during maxillary canine retraction in Angle's class I crowding. Sample of this study consisted of 10 females ranging in age from 18-24 years. 5 received micro-screw implants as a mean of anchorage and the remaining 5 received conventional molar anchorage as Nance holding arch. The molar anchorage loss was determined in both the implant anchored cases and the molar anchored cases by superimposing the lateral cephalometric tracings before and after canine retraction along the palatal plane registered at the anterior nasal spine. The horizontal distances from the pterygoid vertical to the distal surfaces of the first molars were calculated to measure the anchorage loss. In present study all implants remained stable throughout the treatment period and no damage was registered in any implant under the condition of implant loading. Also, no implant deformation was detected in any implant., anchorage loss was detected more significantly (P < .0007) in patients with intraoral anchorage through the Nance holding arch compared to patients with anchorage through orthodontic mini-implants both on the right and left side. In the Nance group the mean anchorage loss was 1.4mm (±0.418) on the right side and 1.42 mm (±0.437) on the left side. On the other hand no molar rotation was detected in the present study either by using the Nance holding arch or the microimplant. So, this study is a further prove of the beneficial use of microimplants as a good anchorage method with profound control of molar rotation.}, keywords = {skeletal anchorage,Implant,Nance appliance,canine retraction}, url = {https://eos.journals.ekb.eg/article_78789.html}, eprint = {https://eos.journals.ekb.eg/article_78789_67ae6b93a6d05d9a9044ea4408bee627.pdf} } @article { author = {Abdelnaby, Yasser and Montasser, Mona and Zaher, Abbas}, title = {Maxillary molar distalization by the frog appliance}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {67-82}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78780}, abstract = {Aim of study: the purpose of this study was to dete Aim of study: rmine dental and skeletal effects of the Frog appliance utilized in distalization of maxillary molars in growing patients. Material and method: Ten female patients with Angle Class II molar relation were selected for this study. The mean age of the patients was 11 years and 9 months. All patients were treated with the Frog appliance for an average period of 7 months and 9 days. Cephalometric radiographs and plaster study models were made at two stages; before and after maxillary molar distalization by the Frog appliance. The cephalometric radiographs and the study models were analyzed and the collected data were subjected to statistical analysis. Statistical t-paired test was done to determine the significant difference between the pretreatment and posttreatment measurements. Results: The maxillary first molars were distalized Results: an average of 4.85 mm (p≤ .01) into a Class I molar relationship in an average period of 7 months and 9 days. During distalization, the first molars were tipped distally an average of 7.2° (p≤ .02), intruded 4.51 mm (p≤ .01) and rotated mesiobuccaly 7.98° (p≤ .01). Anchorageoss measured at the first premolars averaged 1.65 mm (p≤ .01), with mesiobuccal rotation of 3.98 (p≤ .01). The maxillary incisors were labially inclined 4° (p≤ .01). No significant skeletal changes were recorded except for A point. Conclusion: The first maxillary molars have been di Conclusion: stalized by the Frog appliance with significant distal tipping, intrusion and mesiobuccal rotation. Unfortunately it produced reciprocal anchorage loss in the first maxillary premolars and incisors teeth.}, keywords = {Molar distalization,Frog appliance,Class II,anchorage}, url = {https://eos.journals.ekb.eg/article_78780.html}, eprint = {https://eos.journals.ekb.eg/article_78780_6c9603dc681138bb6a683dfaffc82ff5.pdf} } @article { author = {Nassar, Essam}, title = {Frictional characteristics of active self-ligating brackets versus conventional brackets}, journal = {Egyptian Orthodontic Journal}, volume = {37}, number = {June 2010}, pages = {84-93}, year = {2010}, publisher = {Egyptian Orthodontic Society}, issn = {1110-435X}, eissn = {2812-5258}, doi = {10.21608/eos.2010.78772}, abstract = {Objective: to compare the frictional forces generat Objective: ed by two types of active self-ligating brackets and conventional bracket. Material and methods: Material and methods: ial and methods: Two types of active self-ligating brackets (In-Ovation R, GAC International, Bohemia, NY), (SPEED, Strite Industries, Cambridge, Ontario, Canada) and one conventional bracket (Synergy, Rocky Mountain Orthodontics, Denver, Colo). Each bracket was tested with 0.016X0.016”, 0.016X0.022” and 0.017X0.017” (Rocky Mountain Orthodontics, Denver, Colo) stainless steel wires. low-friction opaque ligatures (Rocky Mountain Orthodontics, Denver, Colo) were used for synergy brackets .The universal testing machine was used to measure the frictional resistance for each bracket/wire assembly. Results: Results: Results: SPEED brackets produced a significantly (P< 0.001) more frictional resistance than both In-Ovation R and Synergy brackets with all archwires’ sizes. While, there was no significant difference between frictional forces of Synergy and In-Ovation R brackets (P>0.05). frictional forces increased significantly in all bracket-archwire combinations (P< 0.001) as wire size increased from 0.016X0.016”to 0.016X0.022” and 0.017X0.017” respectively. Conclusions: Conclusions: Conclusions: SPEED SL brackets produced more frictional forces compared with Synergy and In-Ovation R brackets. The frictional resistance increased as wire size increased From 0.016X 0.016” to 0.016X0.022” and 0.017X0.017”. Synergy brackets combined with the low- friction ligatures is considered a proper choice for sliding mechanics.}, keywords = {Self-ligating brackets,Friction,sliding mechanics}, url = {https://eos.journals.ekb.eg/article_78772.html}, eprint = {https://eos.journals.ekb.eg/article_78772_b9e9f29e0beeaea8252e910a107d6299.pdf} }