Zygomatic anchorage for molar intrusion in adult open-bite patients
Eiman
Marzouk
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
Essam
Abdallah
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
Walid
El-Kenany
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
Mohamed
Fata
Department of Maxillofacial and plastic Surgery, Faculty of Dentistry, Alexandria University.
author
text
article
2012
eng
Objective: The aim of this study is to investigate the effectiveness of the mini-plate zygomatic anchorage for intrusion of maxillary molars in adult skeletal anterior open-bite patients. Materials and Methods: The study group was composed of 10 anterior open-bite patients with posterior dentoalveolar excess. Placement of the mini-plates in the zygomatic buttress was carried out under local anaesthesia. After placement of a double TPA, a closed Ni-Ti coil spring was placed bilaterally between the hook of the mini-plate just mesial and distal to the first molar buccal tube applying intrusive force of 450g per side. Lateral cephalograms and posteroanterior radiographs were taken before intrusion (T1: post upper segmental leveling) and after intrusion (T2). The cephalometric films were measured and compared. Results: The mean amount of accomplished molar intrusion was 3.1mm ± 0.74mm, with a rate of 0.36mm per month ± 0.08mm per month and a bite closure of 6.55mm±1.83mm. Mandibular autorotation followed the molar intrusion, SNB and SN-Pog angles significantly increased while the ANB, MP-SN angle and N-S-Gn angle significantly decreased. There was no significant buccal tip in the right and left molars. Conclusion: Zygomatic anchorage can be used effectively for skeletal open-bite correction through posterior dento-alveolar intrusion.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
1
21
https://eos.journals.ekb.eg/article_78828_ba407fb57d9382ca3248293c828d9f53.pdf
dx.doi.org/10.21608/eos.2012.78828
Dento-skeletal changes associated with treatment of deep overbite in class II malocclusion
Safaa
Ghobashy
Department of Orthodontics, Faculty of dentistry, Tanta University.
author
text
article
2012
eng
The present study aimed to evaluate the treatment changes in class II patients with deep overbite. A total of 22 females (15-18 years) were treated with fixed orthodontic appliances divided into 2 groups; the first group comprised of 12 cases with class II division 1and the second group ten cases with class II division 2. All cases possessed over bite more than 4 mm, class II more than 4 degrees and had pre and post treatment lateral cephalometric x-ray films. Eleven angular and ten linear cephalometric measurements were recorded and analyzed before and after treatment. The differences in mean values of variables within each studied group were statistically analyzed using Wilcox on singed rank test. On the other hand the mean differences of overbite before and after intervention were compared between the two studied groups using Mann-Whitney test.Results: Bite depth improved an average of 5.6 mm in class II division1, and 2.6 mm in class II division2 with significant differences within and between the studied groups. All measurements showed changes that were statistically significant except SNB0 in both groups, ANB0, OP/MP0, U1-PP, ANS-Me in group 1, and L1-MP in group 2. Conclusion: Bite depth improved due to the changes in the axial inclination of incisor teeth that were decreased in class II division1, while increased in class II division 2, intrusion of lower incisor in class II division1, and intrusion of maxillary incisor in class II division 2 in addition to extrusion of upper and lower molars in both groups.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
23
44
https://eos.journals.ekb.eg/article_78830_86a38640cc6211f16a6ae8224f118ac5.pdf
dx.doi.org/10.21608/eos.2012.78830
Reliability of cephalometric measurements utilized in evaluation of the vertical facial dimension
Mahasen
Taha
Department of Orthodontics, Faculty of Dentistry, Mansoura University.
author
Mona
Montasse
Department of Orthodontics, Faculty of Dentistry, Mansoura University.
author
text
article
2012
eng
Objectives: the objective of the current study was to assess the reliability of five vertical cephalometric measurements. Materials and Methods: The study used 40 digital lateral cephalographs of subjects with skeletal class 1, accepted normal occlusion, and balanced profile. Each cephalograph was traced and five measurements for evaluating the vertical facial dimension were used; (1) FMA angle, (2) SN-MP angle, (3) Y-axis angle, (4) LFH/TFH, and (5) PFH/TFH. The data was tested for normality and correlations were tested. Results: There were no differences between the female and male groups for the five measurements. All five measurements did not show systematic errors and the casual errors were all almost within 1 measurement unit. Results showed moderate to high correlation between FMA and both SN-MP (r= 0.52) and Y-axis angle (r=0.57) while LFH/TFH showed moderate to high correlation with both PFH/TFH (r= 0.59) and SN-MP (r= 0.60). Conclusions: FMA and LFH/TFH showed more symmetrical and better clustering of the measurements. All five measurements showed causal errors within acceptable clinical level. The results suggest that FMA is better confirmed by other angular measurements; LFH/TFH and PFH/TFH are better confirmed by the SN-MP angle.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
45
59
https://eos.journals.ekb.eg/article_78831_efb2a2d4f970d4861cbe26285432521b.pdf
dx.doi.org/10.21608/eos.2012.78831
Influence of first premolar extraction on mandibular third molar angulation
Nagwa
Enany
Department of Orthodontics, Faculty of dentistry, Alexandria University.
author
Hassan
Ismail
Department of Orthodontics, Faculty of dentistry, Alexandria University.
author
Amira
El Sammak
Department of Orthodontics, Faculty of dentistry, Alexandria University.
author
text
article
2012
eng
Objectives: To compare the changes in position of the developing mandibular third molars in both lower first premolar extraction and non extraction cases. Materials and Methods: Pretreatment and post treatment panoramic radiographs were taken of 15 subjects who had been treated by the extraction of the first mandibular premolars and 15 subjects who had been treated with nonextraction. The horizontal reference plane was used to measure and compare the changes in the inclination of the mandibular second molar and the developing third molars. The occlusal plane was used to measure the distance distal to the mandibular second molar. The distances from mesial cusp of mandibular third molar to occlusal plane and from distal cusp to occlusal plane were also measured. Results: The long axes of the mandibular third molar and second molars to horizontal reference plane pre treatment and post treatment had no statistically significant difference between both groups in the values of the angular changes pre and post treatment .The mean differences in the angle values between pre and post treatment for the right side and the left side showed no statistical significance difference between pre and post treatment in the two groups. A significant correlation was found between the two groups regarding the distance distal to the mandibular second molar to the ramus which increased more in the extraction group than in the non extraction group. Conclusion: premolar extractions will not ensure that the third molars will erupt normally or have sufficient space to achieve good alignment.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
61
70
https://eos.journals.ekb.eg/article_78844_b0e0c861ad3747b0564cbac0dab154d9.pdf
dx.doi.org/10.21608/eos.2012.78844
Shear bond strength of some orthodontic adhesives under wet condition; an in vitro study
Tamer
Ramadan
Department of Orthodontics,Faculty of Dentistry, Suez Canal University.
author
Abbadi
Elkadi
Department of Orthodontics,Faculty of Dentistry, Suez Canal University.
author
Waleed
Refaat
Department of Orthodontics,Faculty of Dentistry, Suez Canal University.
author
text
article
2012
eng
This study was designed to evaluate the shear bond strength of orthodontic brackets bonded to teeth under salivary contamination using three bonding systems; composite with self etching primer, composite with moisture insensitive primer and Assure hydrophilic bonding system. The adhesive remaining index scores were inspected and recorded for each group. Freshly extracted 45 human sound premolars were used in this study. They were randomly divided into three equal groups; each group was assigned with a bonding system. Debonding was done using a universal testing machine. The debonding forces were recorded and statistically analyzed. The results showed that all the three used bonding systems were in the clinically accepted range of the shear bond strength. Moisture insensitive primer group recorded the highest shear bond strength values followed by the self etching primer group; While Assure hydrophilic bonding system recorded the lowest shear bond strength values. For adhesive remaining index scores, the Assure group recorded the least remaining adhesive on the teeth followed by moisture insensitive primer group. While the self etch group recorded the highest remaining index scores.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
71
79
https://eos.journals.ekb.eg/article_78848_c411a607b8603c414c44aec26dd1457e.pdf
dx.doi.org/10.21608/eos.2012.78848
Evaluation of the color stability of different types of polycarbonate brackets
Nagwa
Enany
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
Hanan
Ismail
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
Maha
Ragab
Department of Orthodontics, Faculty of Dentistry, Alexandria University.
author
text
article
2012
eng
Objective: To investigate the discoloring effect of certain foods and photoaging on the color stability of the three different types of polycarbonate brackets. Materials and Methods: Eighty four brackets were selected and divided into three groups: (1) Composite brackets with ceramic like filler (Silicon brackets); (2) Composite unfilled brackets (Spirit brackets) and (3) Polyoxymethylene brackets (Brilliant brackets). Seven specimens of three different esthetic brackets were exposed to tea, coke, curry and accelerated photogeing device to a xenon lamp to simulate natural day light. The brackets were analyzed at the beginning of the experiment and after 24 and 72 hours and 25 days of exposure. Color measurements were performed by means of Vita Easy shade Spectrophotometer according to CIELCh coordinates lightness, chroma and hue and color changes (∆E) were computed. Results: Almost all investigated brackets showed clinically unacceptable discoloration during in vitro exposure to food dyes and UV light with the exception of the polyoxymethylene brackets which showed nonperceptible color change after storage 25 days in coke and UV. Tea and curry discolor all brackets and showed a sharp increase in discoloration after 24 hour. Most of the brackets became yellower after UV light exposure. Conclusions: These current in vitro findings indicate that even newly developed plastic brackets, consisting of composite materials or modern polymers (polyoxymethylene) may have clinically unacceptable color stability in the long-term.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
81
92
https://eos.journals.ekb.eg/article_78850_a740b24f90696f408fc16850113480a8.pdf
dx.doi.org/10.21608/eos.2012.78850
In vivo study of the effectiveness of ozonized olive oil gel on inhibiting enamel demineralization during orthodontic treatment
Safaa
Ghobashy
Department of Orthodontics, Faculty of Dentistry, Tanta University.
author
Heba
El-Tokhey
Department of Orthodontics, Faculty of Dentistry, Tanta University.
author
text
article
2012
eng
The present study assessed the effect of ozonized olive oil gel during orthodontic treatment to inhibit demineralization around orthodontic brackets.
Material and Methods: Fourteen patient, aged 15-18 years, scheduled to have premolars extraction as a part of orthodontic treatment participated in the present study. The patients were randomly divided into 3 groups; control group (16 upper and lower premolars) and two experimental groups (20 upper and lower premolars for each). In the Control group no treatment was applied on the premolars. In experimental groups, after etching and bonding, T-loops were formed with 0.014 inch stainless steel wire and engaged on the experimental teeth. In experimental group II, ozonized olive oil gel was applied sparingly to the tooth surface with concentration of 20:25 μgm/ml. Participants were instructed to apply the ozonized olive oil gel to the buccal surface of the premolars three times daily for 8 weeks after regular oral hygiene procedures. After 8 weeks, the brackets were deboned and the premolars extracted carefully. The premolars of each group were divided into 2 equal numbers; 28 premolars prepared for elemental analyses (calcium and phosphorus) followed by scanning electron microscope investigation, and 28 premolars examined with polarized light. ANOVA test was applied followed by post hoc LSD test to compare between each 2 groups.
Results: Ca/P ratio of enamel in control group was 3.09. In experimental group I, the Ca/P ratio reduced to 1.75, while in group II, the ratio was 2.33, with statistically significant difference between all groups. Polarized light examination of experimental group I revealed increased depths of demineralized areas, and extending deeper in the enamel which was indicated by positive form birefringence. Experimental group II showed the enamel surface with improvement of demineralized lesions in the form of negative form birefringence resembling normal enamel in the control group. Scanning electron microscopic examination of experimental group I showed comparatively increased depths of demineralized areas with deep wavy perikymata. Enamel surface of experimental group II showed almost normal appearance of perikymata, with new hydroxyapatite crystal deposition. Conclusion: The use of ozonized olive oil gel in addition to the standard oral hygiene regimen was found to be beneficial for orthodontic patients to prevent enamel decalcification during treatment.
Egyptian Orthodontic Journal
Egyptian Orthodontic Society
1110-435X
41
v.
June 2012
no.
2012
93
113
https://eos.journals.ekb.eg/article_78852_076690abe0fe901763dcf615d907edbb.pdf
dx.doi.org/10.21608/eos.2012.78852