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Effect of antibacterial monomer-containing adhesive on enamel demineralization around orthodontic brackets: An in-vivo study

TANCAN UYSAL

Makale | 2011 | American Journal of Orthodontics and Dentofacial Orthopedics

Introduction: The aims of this study were to evaluate the effect of an antibacterial monomer-containing selfetching adhesive in reducing enamel demineralization around orthodontic brackets in vivo and to compare it with the conventional adhesive system quantitatively. Methods: Fourteen orthodontic patients were randomly divided into 2 equal groups; they received brackets fitted to all their teeth, bonded with either Clearfil Protect Bond (Kuraray Medical, Okayama, Japan) (experimental group) or Transbond XT (3M Unitek, Monrovia, Calif) (control group). Block randomization to obtain equal numbers in each group was used. After 30 . . . days, all first premolars were extracted with orthodontic indications and longitudinally sectioned. Demineralization was assessed by cross-sectional microhardness. Determinations were made at the bracket edge cementing limits and at occlusal and cervical points 100 and 200 mm away from the edge. In all of these positions, 6 indentations were made at depths of 10 to 90 mm from the enamel surface. Analysis of variance (ANOVA) and the Tukey post-hoc test were used. The statistical significance level was set at P\0.05. Results: ANOVA showed statistically significant differences for adhesive type, position, depth, and their interactions (P\0.05). The multiple comparison test showed that the antibacterial monomer-containing adhesive was significantly more efficient than the conventional adhesive system, reducing enamel demineralization in almost all evaluations (P \0.05). Conclusions: The results indicated that using antibacterial monomer-containing adhesive for bonding orthodontic brackets successfully inhibited caries in vivo. This cariostatic effect was localized at the area around the brackets and was significant after 30 days Daha fazlası Daha az

Effects of modified and conventional facemask therapies with expansion on dynamic measurement of natural head position in Class III patients

TANCAN UYSAL

Makale | 2011 | American Journal of Orthodontics and Dentofacial Orthopedics

Introduction: The aim of this prospective clinical trial was to assess the effects of varying force directions on the dynamic measurement of natural head position and orofacial airway dimensions of Class III patients during maxillary orthopedic protraction compared with an untreated control group. Methods: The conventional facemask group comprised 15 patients (8 girls, 7 boys; mean age, 9.6 6 1.3 years), the modified facemask group comprised 15 patients (7 girls, 8 boys; mean age, 9.5 6 1.5 years), and the control group comprised 15 subjects (7 girls, 8 boys; mean age, 9.8 6 1.6 years). Natural head position measurements and ce . . .phalometric records were obtained from all subjects before and after treatment or the control period (approximately 1 year). An inclinometer and a portable data logger were used to collect the dynamic natural head position data. For statistical comparisons, paired samples t tests, analysis of variance (ANOVA), and post-hoc Tukey tests were used at the P\0.05 level. Results: Both treatment groups showed statistically significant changes in the sagittal (pitch) measurements of natural head position and upper pharynx, aerial, and total area of airway measurements during the treatment period. In the control group, the only statistically significant change was an increased upper pharynx measurement (P 5 0.020). According to the intergroup comparisons, statistically significant natural head position differences were found in the conventional (6.4 flexion) and the modified (5.7 flexion) facemask groups when compared with the controls. The modified facemask group also showed significant changes in aerial (P 5 0.003) and total (P\0.001) areas of the airway measurements compared with the control group. No statistically significant differences were observed between the 2 treatment groups. Conclusions: These findings suggest that modified and conventional facemask therapy with expansion have significant cranial flexion effects on the dynamic measurements of natural head position. Additionally, the modified facemask procedure showed significant effects on the orofacial airway dimensions compared with the initial values and the values of the untreated controls Daha fazlası Daha az

Rapid maxillary expansion effects on dynamic measurement of natural head position

TANCAN UYSAL

Makale | 2011 | The E. H. Angle Education and Research Foundation

Objective: To identify the effect of rapid maxillary expansion (RME) procedure on dynamic measurement of natural head position (NHP). Materials and Methods: The treatment group comprised 23 patients, 12 girls and 11 boys (mean age: 10.1 6 1.1 years), and the control group comprised 15 subjects, 8 girls and 7 boys (mean age: 9.7 6 1.4 years). The test subjects underwent RME treatment using full cap acrylic device, and the mean amount of expansion was 5.48 mm. An inclinometer and a portable data logger were used to collect the NHP data. Intragroup changes were evaluated by using nonparametric Wilcoxon test, and intergroup chang . . .es were analyzed with Mann-Whitney U-test. P values less than .05 were considered statistically significant. Results: The mean difference between initial and final NHP was 0.31u, and this difference was not statistically significant. Also, there were no statistically significant differences between the RME and control groups before and after treatment. Conclusion: Treatment with the RME procedure showed no statistically significant effects on dynamic measurement of NHP when compared with initial values or untreated control Daha fazlası Daha az

Low-shrinking composites. Are they reliable for bonding orthodontic retainers?

TANCAN UYSAL

Makale | 2011 | The Korean Association of Orthodontists

To evaluate the shear bond strength (SBS), fracture mode, wire pull out (WPO) resistance and microleakage between low-shrinking and conventional composites used as a lingual retainer adhesive. Methods: A total of 120 human mandibular incisor teeth, extracted for periodontal reasons, were collected. Sixty of them were separated into two groups. To determine the SBS, either Transbond-LR (3M-Unitek) or Silorane (3M-Espe) was applied to the lingual surface of the teeth by packing the material into standard cylindrical plastic matrices (Ultradent) to simulate the lingual retainer bonding area. To test WPO resistance, 20 samples were prep . . .ared for each composite where the wire was embedded in the composite materialand cured. Then tensile stress was applied until failure of the composite occurred. The remaining 60 teeth were divided into two groups and multi-stranded 0.0215-inch diameter wire was bonded with the same composites. Microleakage was evaluated by the dye penetration method. Statistical analyses were performed by Wilcoxon, Pearson chi-square, and Mann-Whitney-U tests at p > 0.05 level. Results: The SBS and WPO results were not statistically significant between the two groups. Significant differences were found between the groups in terms of fracture mode (p > 0.001). Greater percentages of the fractures showed mix type failure (85%) for Silorane and adhesive (60%) for Transbond-LR. Microleakage values were lower in low-shrinking composite than the control and this difference was found to be statistically significant (p > 0.001). Conclusions: Low-shrinking composite produced sufficient SBS, WPO and micro-leakage values on the etched enamel surfaces, when used as a lingual retainer composite Daha fazlası Daha az

Mandibular asymmetry in unilateral and bilateral posterior crossbite patients using cone-beam computed tomography

İLKNUR VELİ

Makale | 2011 | The E. H. Angle Education and Research Foundation

Objective: To test the hypotheses that (1) there is no difference in mandibular asymmetry between the crossbite and normal side in a unilateral crossbite group (UCG) and between the right and left sides in a bilateral crossbite group (BCG) and a control group (CG); and (2) there is no significant difference in mandibular asymmetry among crossbite groups and control group. Materials and Methods: The cone-beam computed tomography scans of three groups were studied: (1) 15 patients (6 male, 9 female; mean age: 13.51 6 2.03 years) with unilateral posterior crossbite; (2) 15 patients (8 male, 7 female; mean age: 13.36 6 2.12 years) . . . with bilateral posterior crossbite; and (3) 15 patients (8 male, 7 female; mean age: 13.46 6 1.53 years) as a control group. Fourteen parameters (eight linear, three surface, and three volumetric) were measured. Side comparisons were analyzed with paired samples t-test, and for the intergroup comparison, analysis of variance (ANOVA) and Tukey tests were used at the P , .05 level. Results: According to side comparisons, no statistically significant difference was found in the UCG. There were statistically significant differences in hemimandibular (P 5 .008) and ramal (P 5 .004) volumes for the BCG and in ramal height (P 5 .024) and body length (P 5 .021) for the CG. Intergroup comparisons revealed significant differences in hemimandibular (P 5 .002) and body volume (P , .001) for the normal side of the UCG and left sides of the other groups, and in angular unit length (P 5 .025) and condylar width (P 5 .007) for the crossbite side of the UCG and the right sides of the other groups. Conclusions: Contrary to UCG, CG and BCG were found to have side-specific asymmetry. Skeletal components of the mandible have significant asymmetry among the crossbite groups and the CG Daha fazlası Daha az

Ethnic differences in dentofacial relationships of Turkish and Saudi young adults with normal occlusions and well-balanced faces

TANCAN UYSAL

Makale | 2011 | Elsevier

Objectives: The aims of the present study were (1) to determine ethnic differences in craniofacial dimensions between Turkish and Saudi populations and (2) to identify possible gender differences between males and females, based on a sample of untreated young adult subjects with normal occlusions and well-balanced faces. Methods: In total, 163 cephalometric radiographs were traced and evaluated to compare untreated adults of Turkish and Saudi ethnicity. The Turkish group comprised 86 subjects; 45 females and 41 males. The Saudi group comprised 77 subjects; 39 females and 38 males. For statistical evaluation, an independent-sa . . .mples t-test was performed. Results: The Turkish sample had a more retrognathic maxilla and mandible (p< 0.001 for SNA and SNB) and a more vertical direction of facial development (p< 0.001), with Turkish males having more retrusive lips (p< 0.001). Distinctive ethnic differences were found in craniofacial structures between Turkish and Saudi young adults. Conclusions: It is appropriate to consider these aesthetic differences when a Turkish or a Saudi patient is being evaluated during routine diagnosis and treatment planning Daha fazlası Daha az

Fiberle güçlendirilmiş kompozit rezin köprü restorasyonu

EBRU KÜÇÜKYILMAZ

Makale | 2011 | Türkiye Klinikleri

Çocuk ve adolesanlarda konjenital olarak eksik veya travma nedeni ile kaybedilmiş daimi kesici dişlerden kaynaklanan problemlerin tedavisi için farklı yaklaşımlar mevcuttur. Bu olgu raporunda, alt ön keser dişleri konjenital olarak eksik olan hastaya uygulanan polietilen fiber ile güçlendirilmiş rezin tutuculu köprü sunumu amaçlanmıştır. On iki yaşındaki kız çoğuğu, bölümümüze diş eksikliğine bağlı estetik problem nedeni ile getirildi. Ağız içi ve radyolojik muayenesinden alt ön keser dişlerinin konjenital olarak eksik olduğu belirlendi. Komşu yan keser dişler bu bölgeye diastemalı olarak yerleştikleri için mevcut boşluk, köprü yapı . . .mına uygun değildi. Kısa süreli ortodontik tedavi ile köprü yapımı planlanan boşluk kısmen yeterli hale getirildi. Kompozit materyalden hazırlanan köprü gövdesi mevcut boşluğa, fiber ile güçlendirilmiş kompozit rezin materyal yardımıyla sabittendi. Hastanın 24 ay sonraki kontrolünde herhangi bir sorunun olmadığı görüldü. Minimal invaziv yaklaşımla uygulanan fiber ile güçlendirilmiş kompozit rezin köprülerin, gelişim dönemindeki hastalar için estetik, fonksiyon ve fonasyon kayıplarının düzeltilmesinde kullanılan ekonomik bir tedavi seçeneği olduğunu düşünmekteyiz. Different treatment alternatives are considered for the rehabilitation of congenitally or traumatically missing permanent incisors in young children and adolescents. The purpose of this case report is to present an example of polyethylene fiber-reinforced composite resin bonded bridge. A 12-year-old girl, was referred to our clinic with complaints regarding aesthetics. The screening procedure revealed congenitally missing lower central incisors short term orthodontic treatment provided the necessary space for prothetic restoration was relatively opened to a built bridge. Fiber reinforced composite resin material was used to bond the composite bridge restoring the created space. Follow-up examination after 24 months, revealed stability with the absence of problems. Fiber reinforced composite resin bridge applications with minimal invasive approach may be an economical treatment alternative for rehabilitation of aesthetics, function and phonetics in young children and adolescents Daha fazlası Daha az

Changes in mandibular transversal arch dimensions after rapid maxillary expansion procedure assessed through cone-beam computed

ASLI BAYSAL | İLKNUR VELİ

Makale | 2011 | The Korean Association of Orthodontists

Objective: This study aimed at evaluating the changes in mandibular arch widths and buccolingual inclinations of mandibular posterior teeth after rapid maxillary expansion (RME). Methods: Baseline and post expansion cone-beam computed tomographic (CBCT) images of patients who initially had bilateral posterior cross-bite and underwent RME with a banded type expander were assessed in this study. The patients included 9 boys (mean age: 13.97 1.17 years) and 11 girls (mean age: 13.53 2.12 years). Images obtained 6 months after retention were available for 10 of these patients. Eighteen angular and 43 linear measurements were performed f . . .or the maxilla and mandible. The measurements were performed on frontally clipped images at the following time points; before expansion (T1), after expansion (T2), and after retention (T3). Statistical significance was assessed with paired sample t test at 0.05. Results: T1 T2 comparisons showed statistically significant post RME increases for all measurements; similarly, T2 T1 and T3 T1 comparisons showed statistically significant changes. The maxillary linear and angular measurements showed decreases after expansion, and mandibular linear and angular measurements increased after retention. Conclusion: All mandibular arch widths increased and mandibular posterior teeth were uprighted after RME procedure Daha fazlası Daha az

EMG PSD Measures in Orthodontic Appliances

ASLI BAYSAL

Kitap Bölümü | 2011 | InTech

The human body consists of different systems which include the nervous system, the cardiovascular system, the musculoskeletal system, etc. Each system performs some kind of vital task and carries on many physiological processes. For example, the primary functions of the musculoskeletal system can be summarized as generating forces, producing motion, moving substance within the body, providing stabilization, and generating heat. Physiological processes are multifaceted fact and most of them manifest themselves as signals that reflect their nature and activities. These types of signals may be hormonal, physical or electrical. The gene . . .ral name of the electrical signals taken from the related organ or physiologic process with invasive or non-invasive methods is called Biomedical Signals. This signal is normally a function of time and is definable in terms of its amplitude, frequency and phase (Rangayyan, 2002). The electromyography (EMG) signal is a biomedical signal that detects the electrical potential generated by muscle cells when these cells contract, and also when the cells are at rest. Three types of muscle tissue can be identified. One of them is the skeletal muscle, and the others are the smooth muscle and the cardiac muscle. The EMG is applied to the study of skeletal muscle (Reaz et al., 2006). Skeletal muscles are comprised by nearly parallel cells and the muscle fibers which constitute the contractile structural units. Muscle fibers are activated by the central nervous system through electrical signals transmitted by motoneurons. A single motoneuron together with the muscle fibers that it contacts is called a motor unit which is the smallest functional subdivision of the neuromuscular system (Moritani, et al. 2004) The central nervous system controls the activation of motor units to optimize the interaction between our body and the surrounding environment. When the motor units are activated by the central nervous system, they produce an action potential trains of the active motor units add together to generate the interference EMG signal. Surface and needle electrodes have been used to detect EMG of muscles. Surface electrodes have been widely used to investigate neuromuscular functions because of their several advantages, for example, it is noninvasive, easy to adhere to the skin and to detect the total activities of the muscle and it was called Surface EMG (SEMG). Bu the real advantage of this technique is that it is more beneficial in studies, in which simultaneous movement of many muscles is examined in vast muscle groups. On the other hand, surface electrodes have disadvantages as well. Due to the broad area for receiving signals on respective muscl Daha fazlası Daha az

Cone-beam computed tomography assessment of mandibular asymmetry in unilateral cleft lip and palate patients

İLKNUR VELİ

Makale | 2011 | The Korean Association of Orthodontists

Objective: To determine whether there is any difference between the cleft and non-cleft sides of the mandible in unilateral cleft lip and palate (UCLP) patients, or the right and left sides in control patients; and to determine if there is any difference between the mandibular asymmetry of UCLP patients and that of control patients. Methods: We examined cone-beam computed tomography (CBCT) scans of 15 patients with UCLP and 15 age- and gender-matched control patients. We evaluated 8 linear, 3 surface, and 3 volumetric measurements and compared the cleft/non-cleft sides of UCLP patients and the right/left sides of controls. Res . . .ults: There were no statistically significant gender differences in any linear, surface, or volumetric measurement. The single significant side-to-side difference in UCLP patients was a longer coronoid unit on the cleft side than on the non-cleft side (p = 0.046). Body volume was significantly lower in the UCLP group than in the control group (p = 0.008). Conclusions: In general, UCLP patients have symmetrical mandibles, although the coronoid unit length is significantly longer on the cleft side than on the non-cleft side. UCLP patients and controls differed only in body volume Daha fazlası Daha az

Effect of resveratrol on bone formation in the expanded inter-premaxillary suture: early bone changes

TANCAN UYSAL

Makale | 2011 | Wiley

Objective –The aim of this study was to evaluate the effects of local resveratrol (RSVL) administration on bone formation in response to expansion of the interpremaxillary suture, in rats. Material and Methods – Twenty 50- to 60-day-old male Wistar rats were separated into two equal groups. Both groups were subjected to expansion, and 30 cN of force was applied to the maxillary incisors with helical-spring. Twenty-four hours after appliance placement, single-dose 10 lmol ⁄ kg RSVL in the dimethylsulfoxide (DMSO) was injected to the inter-premaxillary suture in the experimental group. In the control group, the same amount of . . .DMSO was injected to the suture of rats. Bone formation in the suture was evaluated histomorphometrically. The area of new bone (lm2), the perimeter around the new bone (lm), Feret s diameter (lm), the percentage of new bone to non-ossified tissue (%), and the number of osteoblast were measured and compared. Mann–Whitney U-test was used for statistical evaluation at p < 0.05 level. Results – Statistically significant differences were found between the groups for all histomorphometric parameters. New bone area (p < 0.001), bone perimeter (p < 0.001), Feret s diameter (p < 0.001), percentage of new bone (p < 0.001), and the number of osteoblast (p < 0.001) were significantly larger in the experimental group when compared with the control. Bone histomorphometric measurements revealed that bone architecture in the RSVL treated rats was improved. Conclusions – Local application of RSVL during the early stages to orthopedically expanded inter-premaxillary suture area may stimulate bone formation and shorten the retention period, in rats Daha fazlası Daha az

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