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Browsing Akademik Arşiv / Academic Archive by Author "ACAR, ZEYNEP AHÜ"
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Publication Open Access A review of early displaced maxillary canines: Etiology, diagnosis and interceptive treatment(2011-03-16) ACAR, ZEYNEP AHÜ; Litsas G., Acar A.Impaction of maxillary canines is a frequently encountered clinical problem the treatment of which usually requires an interdisciplinary approach. Surgical exposure of the impacted tooth and the complex orthodontic mechanisms that are applied to align the tooth into the arch may lead to varying amounts of damage to the supporting structures of the tooth, not to mention the long treatment duration and the financial burden to the patient. Hence, it seems worthwhile to focus on the means of early diagnosis and interception of this clinical situation. In the present article, theories related with the etiology of impacted canines and predictive variables of canine impaction in the mixed dentition are reviewed with an insight into current interceptive treatment modalities. © Litsas and Acar; Licensee Bentham Open.Publication Open Access Dimensional changes of maxillary sinuses and pharyngeal airway in Class III patients undergoing bimaxillary orthognathic surgery(E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2013-09-01) ACAR, ZEYNEP AHÜ; Panou, Eleni; Motro, Melih; Ates, Mustafa; Acar, Ahu; Erverdi, NejatObjective: To evaluate the pharyngeal airway and maxillary sinus volume changes after mandibular setback surgery combined with maxillary advancement and/or impaction surgery. Materials and Methods: Seventeen Class III skeletal patients (11 females, 6 males) who required bimaxillary orthognathic surgery were selected. Volumetric measurements were performed using cone beam computed tomography (CBCT) scans preoperatively and 3.9 +/- 0.87 months postoperatively. All the CBCT scans were assessed and analyzed using MIMICS 14.0 software. Preoperative and postoperative volumes of pharyngeal airway and maxillary sinuses and the relationship between the amounts of surgical movement of the jaws and the above volumes were statistically evaluated. Results: The pharyngeal airway area presented no significant change except for the lower and total pharyngeal airway volumes in males, in whom a significant decrease was observed (4196.27 +/- 2061.11 mm(3) and 3375.53 +/- 3624.67 mm(3), respectively). No significant change was observed in the minimal cross-sectional area of the pharyngeal airway. There was a significant decrease in the volume of the maxillary sinuses after the surgery by 3448.09 +/- 3315.56 mm(3). No correlation was found between the amount of skeletal movement and the change in the volume of pharyngeal airway or maxillary sinuses. Conclusion: There was a significant decrease only for lower and total pharyngeal airway volumes in males and a significant decrease in the volume of the maxillary sinuses.Publication Open Access Evaluation of facial soft tissue parameters for Palestinians using Holdaway analysis(2011-10) ACAR, ZEYNEP AHÜ; Hussein, Emad; Khateeb, Susan Al; Watted, Nezar; Aksoy, Alev; Acar, Ahu; Abu Mowais, MahmoudPublication Metadata only Evaluation of the relationship between the anterior component of occlusal force and postretention crowding(MOSBY, INC, 2002) ACAR, ZEYNEP AHÜ; Acar, A; Alcan, T; Erverdi, NThe aim of this study was to investigate whether a relationship exists between the anterior component of occlusal force (ACF) and postretention crowding in the mandibular incisor area. The study group comprised 32 adults who had undergone fixed orthodontic treatment in the department clinic at Marmara University in Istanbul, Turkey. In 13 subjects, the mandibular arch was treated without extractions; in 19, it was treated with bilateral first premolar extractions. The average postretention period was 3.5 years. The ACF created in the left side of the mandibular dentition was determined by measuring interdental frictional forces at each contact point mesial to the first molar and distal to the canine. Anatomic contact point displacements between the left mandibular anterior teeth (lateral incisor-canine, central incisor-lateral incisor, and central incisor-central incisor) were measured on plaster casts and summed to provide the irregularity index for these teeth. Correlation analysis was used to assess the relationship between the ACF values at each contact and the irregularity index. In the nonextraction group, statistically significant positive correlations were observed between the ACF and the irregularity index at the 3 contact points that were measured. The strongest correlation was found at the canine-first premolar contact (r = 0.65). In the extraction group, a positive correlation was found between the ACF and the irregularity index (r = 0.49, P <.05) at the second premolar-first molar contact, but no correlation was found at the canine-second premolar contact.Publication Metadata only Evidence-based orthodontics: Appraisal of the methodologies of systematic reviews and meta-analyses in controversial areas of orthodontics(2013) ACAR, ZEYNEP AHÜ; Sygouros A., Acar A.Background: This article aimed to evaluate the methodologic quality of systematic reviews (SRs) and meta-analyses (MAs) related to three controversial areas of orthodontics. Methods: Electronic database searches of published orthodontic literature (SRs and MAs) were performed. Three research questions were formulated to include articles in the study: 1) What is the interrelation between orthodontic treatment and temporomandibular disorders (TMDs)?; 2) What is the effect of functional treatment on mandibular growth?; and 3) What differences can be found in a comparison of early/two-phase and late/one-phase orthodontic treatment for Class II malocclusion in growing patients? Studies satisfying the inclusion criteria were appraised in terms of their methodology. The tool for the assessment of the methodology used was the Revised-Assessment of Multiple Systematic Reviews (R-AMSTAR). Results: A search revealed 10 studies that satisfied our inclusion criteria. R-AMSTAR evaluations ranged between 13 and 44 points (mean ± SD 29.7 ± 9.44). Three SRs were classified as high-quality studies, two of good quality, and five were judged as having fair to low quality methodology. Further analysis of the results was performed and presented in accordance with the conclusions of each study. Conclusions: R-AMSTAR is a readily applicable and validated tool for assessing the methodology of a SR. Most of the SRs concerning our research questions were of average quality. Efforts should be made to reduce methodologic flaws. © 2013 World Federation of Orthodontists.Publication Metadata only Morphologic changes of the nasal cavity induced by rapid maxillary expansion: A study on 3-dimensional computed tomography models(MOSBY-ELSEVIER, 2009) ACAR, ZEYNEP AHÜ; Haralambidis, Adam; Ari-Demirkaya, Arzu; Acar, Ahu; Kucukkeles, Nazan; Ates, Mustafa; Ozkaya, SelinIntroduction: The aim of this study was to evaluate the effect of rapid maxillary expansion on the volume of the nasal cavity by using computed tomography. Methods: The sample consisted of 24 patients (10 boys, 14 girls) in the permanent dentition who had maxillary constriction and bilateral posterior crossbite. Ten patients had skeletal Class I and 14 had Class II relationships. Skeletal maturity was assessed with the modified cervical vertebral maturation method. Computed tomograms were taken before expansion and at the end of the 3-month retention period, after active expansion. The tomograms were analyzed by Mimics software (version 10.11, Materialise Medical Co, Leuven, Belgium) to reconstruct 3-dimensional images and calculate the volume of the nasal cavities before and after expansion. Results and Conclusions: A significant (P = 0.000) average increase of 11.3% in nasal volume was found. Sex, growth, and skeletal relationship did not influence measurements or response to treatment. A significant difference was found in the volume increase between the Class I and Class II patients, but it was attributed to the longer expansion period of the latter. Therefore, rapid maxillary expansion induces a significant average increase of the nasal volume and consequently can increase nasal permeability and establish a predominant nasal respiration pattern. (Am J Orthod Dentofacial Orthop 2009;136:815-21)Publication Metadata only Multidisciplinary treatment approach for correction of facialasymmetry: 3 cases(2019-11-05) ACAR, ZEYNEP AHÜ; ACAR, YASEMİN BAHAR; YILDIRIM, GAMZE; BÜYÜKAKÇA M., YILDIRIM G., ACAR Y. B., BİREN S., ACAR Z. A.AIM: Ideal treatment planning for the correction of severe skeletal malocclusion is orthodontics combined with orthognathic surgery. This poster aims to present multidisciplinary treatment of 3 cases with Class III malocclusion and mandibular deviation. MATERIAL-METHOD: Three female patients with the chief complaints of mandibular prominence and facial asymmetry were admitted to treatment in our clinic. Case 1, clinically had asymmetrical face, adequate lip closure, normal smile-line, concave profile; dental Class III relationship and posterior openbite on the right. Lateral cephalometric evaluation showed SNA:75°, SNB:79°, ANB:-4°, I-SN:104 °, IMPA:87 °, Witts:- 4.5mm and low angle vertical growth pattern. Postero-anterior cephalometric measurements revealed 1.0mm shifting of menton to left and 3° counterclockwise occlusal cant. Case 2 had asymmetric face, insufficient lip closure, low smile-line, convex profile; dental Class III relationship and circular openbite. Cephalometric values showed SNA:79°, SNB:77°, ANB:2°, I-SN:106°, IMPA:78°, Witts:-13mm and high angle vertical growth pattern. Menton point was shifted 10.6 mm to left and the occlusal cant was 2° counterclockwise. Case 3 had asymmetrical face, adequate lip closure, normal smile-line, flat profile; dental Class III relationship, crossbite on the left posterior and edge-to-edge bite at the anterior region. CephalometricvaluesshowedSNA:83°,SNB:81°,ANB:2°,I-SN:105°,IMPA:86°,Witts:-5.5mmandhigh angleverticalpattern. Menton pointwas 6.4 mm to left and occlusalcantwas 3° counterclockwise. Non-extraction orthodontic decompensation treatment was planned and patients underwent orthognatic surgery when model surgery displayed stable occlusion. The total duration of treatment was 25, 20 and 19 months, respectively. CONCLUSIONS: Class I molar and canine relationship, ideal overbite and overjet were achieved with the orthodontic and surgical treatment. Sagittal and transversal jaw relations were improved and facial symmetry was improved. As a result, patients were provided with good function and satisfactory aesthetics.Publication Metadata only [Surgically assisted rapid maxillary expansion. An evaluation of different surgical techniques and their effect on maxillary dentoskeletal complex based on cone-beam computed tomography. Preliminary report]. [Expansion maxillaire rapide assistée chirurgicalement. Évaluation de différentes techniques chirurgicales et de leur effet sur le complexe dento-squelettique maxillaire par tomographie volumique à faisceau conique (CBCT). Rapport préliminaire.](2014) UĞURLU, FAYSAL; Sygouros A., Motro M., Ugurlu F., Acar A.To evaluate and compare the dentoskeletal effects associated with surgically assisted rapid maxillary expansion (SARME) performed with (+) and without (-) pterygomaxillary disjunction (PD), utilizing cone beam computed tomography (CBCT). A retrospective study of 9 patients (1 male, 8 females, mean age 18.9 years) undergoing SARME who were divided into two groups. In group (-PD) the surgical technique followed involved bilateral LeFort I type of osteotomy plus midline osteotomy. In group (+PD) same protocol was followed and pterygoid disjunction was performed additionally. Three-dimensional CBCT scans were obtained preoperatively and 3-6 month postretention. A Hyrax type acrylic bonded expander was used. MIMICS 14.0 (Materialise Europe, Belgium) software was used to evaluate transverse expansion at skeletal, dentoalveolar and dental level. Additionally dental inclinations, alveolar bending and the pattern of expansion sagittally were assessed. Wilcoxon's and Mann Whitney U tests were used for comparisons. All linear transverse measurements at dental and dentoalveolar level were found to have a statistically significant increase (P < 0.05) in both treatment groups. No statistically significant differences were found between the two groups as well as within groups on skeletal level (except of the anterior expansion of maxilla between piriform rims bilaterally). In -PD group significant buccal tipping of the 1(st) premolar was observed as well as increased buccal bending of the alveolar crest. This study confirms that SARME is an effective treatment of maxillary transverse deficiency. CBCT is an adequate tool to assess dentoskeletal treatment effects. © EDP Sciences, SFODF, 2014.Publication Metadata only Surgically assisted rapid maxillary expansion: Cone-beam computed tomography evaluation of different surgical techniques and their effects on the maxillary dentoskeletal complex(MOSBY-ELSEVIER, 2014) UĞURLU, FAYSAL; Sygouros, Antonios; Motro, Melih; Ugurlu, Faysal; Acar, AhuIntroduction: The aims of this study were to evaluate and compare skeletal, dentoalveolar, dental, and periodontal changes in surgically assisted rapid maxillary expansion (SARME) patients with and without pterygomaxillary disjunction. Methods: The records of 20 patients who underwent SARME in the clinics of the dental school at Marmara University in Turkey were collected and divided into 2 groups of 10 patients each, according to the surgical protocol followed. Cone-beam computed tomography images before the operation and 3 to 6 months after the end of active expansion were analyzed by 20 linear and 7 angular measurements. The reliability of the 3-dimensional analysis was investigated. Results: All transversal measurements in the dentoalveolar and dental levels increased after expansion in both the SARME with pterygomaxillary disjunction and the SARME without pterygomaxillary disjunction groups with no significant differences between them. In the SARME without pterygomaxillary disjunction group, more pronounced buccal alveolar bending and buccal tipping of the posterior teeth were found, but the difference did not reach statistical significance. SARME reduces buccal alveolar width in the premolar region significantly when pterygoid disjunction is not performed. Conclusions: SARME with or without pterygomaxillary disjunction is an effective technique to treat maxillary transverse deficiency in adolescent and adult patients. Pterygomaxillary disjunction is advised in periodontally compromised patients. Cone-beam computed tomography scanning is a reliable method for studying the dentoskeletal effects of SARME.Publication Metadata only Translation of a tooth across the suture to replace a fused upper central incisor(2022-06-01) ACAR, ZEYNEP AHÜ; Karkazi F., Logothetis G., Shahab N., Rabie A. B. M. , Acar A.