Mohammad Karim Soltani; Amirfarhang Miresmaeili; Bahareh Javanshir; Mojgan AkbarZadeh
Abstract
background and aim: functional appliances with various designs have been introduced in the treatment of Class II malocclusions. The aim of this study was to evaluate dentoskeletal effects of a modified bionator (FA) and Twin Block (TB) functional appliance in treatment of skeletal Class II malocclusion.Method ...
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background and aim: functional appliances with various designs have been introduced in the treatment of Class II malocclusions. The aim of this study was to evaluate dentoskeletal effects of a modified bionator (FA) and Twin Block (TB) functional appliance in treatment of skeletal Class II malocclusion.Method and material: in this retrospective study 30 treated cl II patients with overjet greater than 4mm have been selected from each of two private offices .in each office either FA or TB were used. Pre-treatment and post-treatment lateral cephalograms were digitized and traced with Dolphin Imaging software. ANCOVA and paired T test were used for analysis with SPSS software (19).Results: FA group consisted of 17 girls and 13 boys(mean age: 9.53± 1.1), TB group consisted of 12 boys and 18 girls(mean age: 10.26 ±.944 ) .ANB angle and overjet were reduced significantly in both groups. (p=.000) Mandibular body length demonstrated a significant increase in both groups( 3.06±4.98mm with TB and 3.03±5.52mm with FA ). In Both appliances significant retrusion of upper lip occurred as a result of decrease in overjet (TB=002, FA=.000). No statistical significant difference were found between two appliances.Conclusions: Treatment with both appliances resulted in correction of Class II discrepancy, reduction of overjet, and retrusion of upper lip. No significant dento-skeletal differences were observed between the 2 appliances.
Shahrzad Tamasoki; Amirfarhang Miresmaeili; Masome BasamTabar; S. Fazlollahi; Mojgan Akbarzadeh
Abstract
Background and aim: The etiology of CL/P is thought to be multifactorial with both genetic and environmental factors. Methylentetrahydrofolatereductuse (MTHFR), an important enzyme in folic acid metabolism with C677T polymorphism is one of the most controversial enzyme in CL/P. Our aim was comparison ...
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Background and aim: The etiology of CL/P is thought to be multifactorial with both genetic and environmental factors. Methylentetrahydrofolatereductuse (MTHFR), an important enzyme in folic acid metabolism with C677T polymorphism is one of the most controversial enzyme in CL/P. Our aim was comparison of MTHFR C677T polymorphism in non syndromic CL/P patients with their healthy relatives.Materials and methods: We examined 50 consecutive CL/P patients and 150 their relatives (father, mother and sibling). Blood samples of all cases were collected. DNA extracted using Millers salting out method, and then C677T of MTHFR gene was evaluated by PCR. The results were analysis by Mc-Nemar test with spss19. Results: The frequency of genotype in patients compared with their mother (p= 0.282), father (p= 0.423) and sibling (p=0.607) and we didn’t find significant different between them. Also there was no significant difference between patient’s allele frequency when compared with their mother (p=1.000), father (p=0.405) and sibling (p= 0.804).
Conclusion: In this case-control study, patient’s parents and sibling were used as controls. Frequency of normal allele C677T(C) was higher than altered allele (T) in patients and control groups. We did not find any relation between NSCL/P and C677T polymorphism however; conflicting results have been achieved in different studies.
Vahid Molabashi; Zohreh Hedayati; Amirfarhang Miresmaeili; Farhad Kashi; Maryam Dinparvar
Abstract
Background and aim: Accurate identification of dental and skeletal characteristics of different kinds of malocclusions is necessary for educational purposes, proper treatment planning and to reach successful results. The aim of this study was to assess skeletal and dental differences of class II division ...
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Background and aim: Accurate identification of dental and skeletal characteristics of different kinds of malocclusions is necessary for educational purposes, proper treatment planning and to reach successful results. The aim of this study was to assess skeletal and dental differences of class II division I patients in Shiraz and Hamadan Dental Schools.
Method: In this retrospective study lateral cephalograms of 98 patients from Hamadan (53 girls and 45 boys) and 96 Patients from Shiraz (48 girls and 48 boys) with class II division I malocclusion and age range of 9-14 years old were evaluated. Cephalograms with ANB angle higher than 5 degree were traced with Dolphin program. Statistical analysis was performed using SPSS software. Student t- test was used for between group comparisons. Chi- Square tests used for dichotomous variables.Results: Comparison of mean values of variables between the two groups showed significant differences between SNB, MP-SN, U1-NA0,Y-Axis, Inter incisal angle and PFH/AFH. High percent of patients in both groups had mandibular retrusion, vertical facial growth pattern, protrusion of upper and lower anterior teeth. These characteristics were not statistically significant between boys and girls.Conclusion: This study revealed that there was more mandibular retrusion, vertical facial growth and maxillary protruded incisors in class II division I patients of Hamadan in comparison to Shiraz.
Amirfarhang Miresmaeili; Mohammad Atai; K. Mansouri; Nasrin Farhadian
Abstract
Background and aim: Present in-vitro study was designed to evaluate the effect of nanosilver incorporation on antibacterial properties and Bracket Bond Strength (BBS) of orthodontic composite resin. Materials and methods: A light curing composite resin was mixed with metallic nanosilver to obtain ...
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Background and aim: Present in-vitro study was designed to evaluate the effect of nanosilver incorporation on antibacterial properties and Bracket Bond Strength (BBS) of orthodontic composite resin. Materials and methods: A light curing composite resin was mixed with metallic nanosilver to obtain final concentrations of 0%, 0.5%, 1% and 2.5% (wt/wt). Scanning electron microscopy (TESCAN, VEGA II, XMU, Czech Republic) was used to confirm the uniform distribution of nanoparticles in resin matrix. Thirty disk type specimens (4.0 × 1.0mm) were prepared for each group. Antibacterial activity was determined by evaluation of bacterial growth in suspension media versus growth in direct contact with specimens. BBS and bond failure interface (ARI) were evaluated and compared between the specimens. Bacterial activity of control group compared with the group with maximum antibacterial activity. Results: There were no significant differences in bacterial growth in any specimens in suspension media (P=0.623). The results of second method (direct contact) showed significant differences between all groups (P<0.001). Specimens with maximum antibacterial activity (containing 1% nanosilver) and control group had no significant difference in the BBS (P=0.455). ARI was completely identical in these two groups. Conclusions: Nanosilver containing composite could confer surface antibacterial activity without significant difference on BBS and ARI.
Nasrin Farhadian; Amirfarhang Miresmaeili; Reza Mahvelati; Ahmad Sajedi
Abstract
background and aims: Cone-beam computed tomography (CBCT) is becoming established as a superior radiographic technique to conventional radiography in orthodontics. However cephalometric analysis in conventional lateral cephalograms (LC) is still an important tool in treatment planning. The aim of this ...
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background and aims: Cone-beam computed tomography (CBCT) is becoming established as a superior radiographic technique to conventional radiography in orthodontics. However cephalometric analysis in conventional lateral cephalograms (LC) is still an important tool in treatment planning. The aim of this study was to compare cephalometric measurements performed on conventional cephalograms with those on CBCT generated images.Method and materials: 24 patients with both LC and volumetric CBCT imaging (Newtom 3G) were selected. Generated Lateral cephalograms (GLC) were produced from related DICOM files in Dolphin 3D. cephalometric analysis, consisted of fifteen angular measurements and fifteen linear measurements (Dolphin V.11.2) were performed on both LCs and GLCs. Paired T-Test was used to compare differences in measurements between the two image modalities. Results: According to paired t-test results no statistically significant differences were found between the two set of measurements except Articular Angle, Gonial Angle (Ar-Go-Me) and Ramus Height (Ar-Go) (P<0.05). Since in all cases the interval between LC and CBCT imaging was short (3.5 months ± 2) and treatment has began after CBCT imaging, neither growth nor treatment was the cause of these differences. It could be supposed that the technical positioning errors in LCs of some patients might be the cause. Conclusions: LC could successfully be replaced by GLC. Since we can select the best orientation of the skull before generating GLC from CBCT DICOM files, GLC could be more reliable than LC.
Shahriar Shahab; Amirfarhang Miresmaeili; Mehdi Esmaeili; Vahid Mollabashi; Nasrin Farhadian
Abstract
Aim: The main objective of this preliminary study was to introduce a new approach for the estimation of nasal cavity volume using two dimensional measurements in serial sections, as an alternative to planimetry volume measurements.
Materials and Methods: Ten CBCT images were studied in the coronal plane ...
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Aim: The main objective of this preliminary study was to introduce a new approach for the estimation of nasal cavity volume using two dimensional measurements in serial sections, as an alternative to planimetry volume measurements.
Materials and Methods: Ten CBCT images were studied in the coronal plane and the 4-mm thick sections were selected between Anterior and Posterior Nasal Spine. Real estimation of nasal cavity volume was computed using Cavalieri principle in conjunction with planimetry method. The outline of each slice was digitized and the resulted surface area was computed by AutoCAD software. In alternative method, a surface area estimate was measured by multiplying maximum width and maximum height in each slice. The sum of slices area in each method was named as Total Nasal Cavity Area (TNCA). Nasal cavity volume = TNCA × thickness of tomography slice. TNCA1 based on planimetry method, was compared with TNCA2 using to coordinates with linear regression analysis.Results: Regression analysis showed a powerful correlation between two methods measurements (r = 0.951). The following formula was proposed for volume estimation using the coordinate method: TNCA1 = 85.6±1.53 TNCA2.
Conclusions: In this pilot study, we substituted successfully two linear measurements instead of planimetry to estimate nasal cavity volume. This may help investigators to overcome inherent problems appearing in measurements of nasal cavity volume.
Amirfarhang Miresmaeili; Shahriar Shahab; Faezeh Yousefi; Vahid Mollabashi
Abstract
Aim: Tooth size in panoramic view has both magnification and distortion. It is supposed that panoramic view generated from Cone Beam computed tomography (CBCT) has more accurate tooth size compared with conventional panoramic view. The purpose of this study was to compare magnification of mandibular ...
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Aim: Tooth size in panoramic view has both magnification and distortion. It is supposed that panoramic view generated from Cone Beam computed tomography (CBCT) has more accurate tooth size compared with conventional panoramic view. The purpose of this study was to compare magnification of mandibular tooth size in digital panoramic radiographs andCBCT reconstructed panoramic images.
Materials and Methods: Amongpatients referred to Hamadan dental school, having both digital panoramic radiograph and CBCT, 28 patients were selected. Maximum width and length of mandibular teeth No. 36,34,33,31,41,43,44, 46 were measured in digital panoramic views and in CBCT reconstructed panoramic views. The CBCT images in multiple planes were used to give the dimensions referred to as gold standard. MANOVA test, Post Hoc and Tukey were used for statistical analysis.Results: There was a significant difference in width and length of teeth between digital panoramic view and both reconstructed panoramic view and gold standard (P value< 0.05). In digital panoramic view the maximum and minimum of magnification was observed in incisors and molar teeth respectively. There were no statistical differences in width and length measurements between reconstructed panoramic view and gold standard except for magnification in incisor teeth width (P value> 0.05). Conclusion: CBCT reconstructed panoramic views show significantly less magnification regarding tooth size compared with digital panoramic views.
Amirfarhang Miresmaeili; Nasrin Farhadian; Khosrou Mani Kashani; Hamidreza Moradi
Abstract
Aim: Lips-Dentition relationships play a special role during smile. Present study compared the relationship of lips and teeth during posed smile in subjects with normal occlusion, class 1 malocclusion and non-extraction treated cases.
Materials and methods: 20 cases with normal occlusion according to ...
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Aim: Lips-Dentition relationships play a special role during smile. Present study compared the relationship of lips and teeth during posed smile in subjects with normal occlusion, class 1 malocclusion and non-extraction treated cases.
Materials and methods: 20 cases with normal occlusion according to Andrews' and without facial malformation (N), 22 cases with moderate crowding (C 1) and 12 well treated patients without any extraction and facial malformation (T) with the age between 15 — 20 years old were selected. One photograph in rest position and another in posed smiling were taken in standard position. 12 variables on photos were measured by use of a smile mesh. ANOVA and Krukal-wallis tests were used for analysis.
Results: Commissure width and Smile width was significantly greater in group N than groups Cl and T (P<0.001). Upper lip curvature in non-extraction treated group was concave but in others were convex (P<0.022). Inter-canine width in group N was significantly higher than treated patients (P<0.03).
Conclusion: There is a direct relation between anatomic form of lips in rest and in smiling. Orthodontic treatment can cause some changes in lips form during smiling (IJO 2006; 1:163-7).
