Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
31
June 2007
2007
06
01
Study of the effect of topically applied oral gel formulas in the prevention and treatment of early enamel decalcification (in vitro study)
1
25
79288
10.21608/eos.2007.79288
EN
Abbas R
Zaher
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Hanaa S
Raslan
Department of Oral Biology, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Hanan A
Ismail
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
0000 0002 2685 7075
Perihan N M
Ali
Department of Oral Biology, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Journal Article
2007
01
08
The present study was designed to evaluate and compare the effect of Topacal C-5, a casein phosphoprotein amorphous calcium phosphate formulation and Home care 0.4 % stannous fluoride gel in the prevention and treatment of white spot lesions.The first part of the study compared the effect of Topacal C-5 and stannous fluoride gel in preventing enamel demineralization. Thirty sound premolar teeth were divided into 3 equal groups of tens: Group I was treated with Topacal C-5, Group II was treated with stannous fluoride, and Group III was used as control group and received no treatment. Standard edgewise brackets were bonded to all teeth then the teeth were coated with an acid resistant varnish leaving about 2mm occlusal and gingival to the bracket. The teeth were cycled between artificial saliva and artificial caries solution everyday for 35 days. Polarized light microscope pictures were taken and the depth and area of the demineralized zone was measured and compared statistically. The Topacal C-5 group showed the least depth and area of demineralization compared to the other two groups. The fluoride group also showed some reduction in the depth and area of demineralization compared to the control group. The second part of the study evaluated the effect of Topacal C-5 CPP-CP and stannous fluoride gel in treating white spot lesions. Artificial white spots were induced in 30 sound premolar teeth. The teeth were then divided into 3 groups: Group I was treated with Topacal C-5, Group II was treated with stannous fluoride, and Group III received no treatment and acted as a control group. The teeth were cycled between artificial saliva and caries solution for 4 weeks. Stereomicroscopic pictures were taken and a scoring system was used to evaluate the severity of the white spot lesions after two weeks and 4 weeks. The number of teeth which showed an improvement in the severity of the white spot lesions from the baseline was greater in the group treated with Topacal C-5 than the stannous fluoride and control group although the improvement was not statistically significant.
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
31
June 2007
2007
06
01
Mandibular dimensions and facial height of cleft lip and palate subjects
27
38
79285
10.21608/eos.2007.79285
EN
Eman A
Al Kofide
Orthodontic Division, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
Journal Article
2007
01
27
The aim of this study was to measure the mandibular dimensions and the anterior facial height of cleft lip and palate patients, and to compare them with a non-cleft control group. A total of 93 patients (57 males and 36 females) with clefts aged 11-27 years, were evaluated through cephalometric radiographs. The types of cleft included unilateral cleft lip and palate (UCLP), bilateral cleft lip and palate (BCLP), and cleft lip only (CL). A group of 28 normal subjects (18 males and 10 females) were used as a control group. All groups were matched according to gender and age. Results reveal that there were no significant differences between the cleft groups except in the mandibular plane angle (SN-Mand), where BCLP subjects displayed higher angles than CL only. A significantly larger mandibular plane angle was observed when comparing subjects with BCLP and UCLP and the controls (P<0.01). No significant difference was found between the SNB of the cleft groups or the controls. The cleft subjects displayed smaller mandibular and ramal length (CO-GN and CO-GO), and shorter upper anterior facial height (N-A) compared with the controls. Male cleft subjects showed larger dimensions than female cleft subjects in all linear dimensions, but were still considered smaller than the control group. We can conclude that cleft subjects display certain characteristics such as high mandibular plane angles and smaller mandibular dimensions, more so than subjects without clefts.
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
31
June 2007
2007
06
01
Scanning electron microscopic study of root resorption and repair in response to low magnitudes of force
40
56
79289
10.21608/eos.2007.79289
EN
Safaa A
Ghobashy
Department of Orthodontics, Faculty of Dentistry, Tanta University, Tanta, Egypt
Suzi
Sheneshan
Department of Oral Histology, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
Journal Article
2007
01
19
The purpose of the present study was to investigate the presence, location and severity of root resorption after orthodontic buccal tipping movement using two magnitudes of force and register root repair following two different periods of retention. Fixed orthodontic appliances were inserted to the first premolars of twenty four patients having maxillary crowding and seeking orthodontic treatment. In each patient, force of 20g was applied to the right side and force of 50g.was applied to the left side. Active tooth movement lasted for 4weeks and followed by retention periods 4 & 8 weeks for each magnitude of force. All the specimens were examined with scanning electron microscopy. Three distinct types of resorption defects were detected: small isolated lacunae, wide shallow resorption bays, and deep lacunae. The number of each type of resroption defect and the distribution over the length of the roots varied with the magnitude of force. The pattern of repair was partial, functional or anatomical depending on the type of resorption defect and the retention period. In conclusion, the force of 20g resulted in few and shallow resorption lacunae mainly at the cervical and middle thirds of the buccal surface, while the force 50g resulted in deeper lacunae that were detected on the buccal surface with the middle and apical thirds of the lingual surface. Repair process started during active tooth movement and the healing potential increased greatly in the retention periods.
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
31
June 2007
2007
06
01
Evaluating the sagittal base relationship in an Egyptian population sample using the beta angle
57
69
79287
10.21608/eos.2007.79287
EN
Hanan A
Ismail
Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
0000 0002 2685 7075
Journal Article
2007
01
27
Cephalometric analysis using the ANB angle and the “Wits appraisal” to diagnose sagittal base relationship can be very deceiving due to the many factors affecting these measurements and camouflaging the real relationship. The Beta angle is independent on any cranial land marks and gives a better picture of the sagittal base relationship. The aim of this study was to find the mean and cut off points of this angle (previously developed at Tufts university) in an Egyptian Population sample. 120 patient’s files were selected and screened on the base of 3 criteria: angle ANB, “Wits appraisal” and XY axis to differentiate between classes I , II and III Skeletal patterns. Using ANOVA and Posthox analysis the mean value of Beta angle for class I was 32.21 degrees for class II 25.1 degrees and for class III 41.8 degrees. The Receiving Operator Characteristic curve analysis showed that the cut off point between skeletal classes I and II was 29o and between skeletal classes II and III was 34 degrees.
Egyptian Orthodontic Society
Egyptian Orthodontic Journal
1110-435X
31
June 2007
2007
06
01
Sella turcica size in subjects with clefts: longitudinal cephalometric measurements
71
80
79286
10.21608/eos.2007.79286
EN
Eman A
Al Kofide
Orthodontic Division, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
Journal Article
2007
02
27
The purpose of this study was to examine the size of sella turcica in cleft subjects from the age of 4-33 years by using standardized serial lateral radiographic cepholgrams. Forty-nine subjects with cleft of the lip and/or palate were included; 24 unilateral cleft lip and palate (UCLP), 17 bilateral cleft of the lip and palate (BCLP), 6 cleft of the lip (CL), and 2 cleft palate only (CP). The length, depth, and diameter of sella turcica were measured and the mean values were analyzed longitudinally. The results show that when comparing mean dimensional changes of sella turcica between cleft groups, an increase in the diameter of sella turcica was apparent with growth, more so than length and depth. Subjects with UCLP displayed the largest dimensional changes in depth and diameter of sella turcica with age (+0.04167, +0.04167), while subjects with BCLP showed a reduction in the mean length and depth (-0.05882 mm, -0.05882 mm). Significant variations were found in the length, depth and diameter of sella turcica between cleft groups (P < 0.05, P < 0.001, and P < 0.001 respectively). When the effect of age was studied, a positive tendency towards an increase in the linear dimensions of depth and diameter of sella turcica was evident as age increased (P < 0.001). We can conclude that the diameter of sella turcica shows the largest change with growth, and that an increase in dimensional change (depth and diameter) in sella turcica occurs in cleft subjects up until the age of 25 years old.