Yazar "Gelgor, Ibrahim Erhan" seçeneğine göre listele

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    Cephalometric Evaluation of Turkish Children With Class III Malocclusion in the Mixed Dentition
    (Aves Press Ltd, 2013) Celebi, Ahmet Arif; Tan, Enes; Gelgor, Ibrahim Erhan; Colak, Tugba
    Objective: To investigate the cephalometric characteristics of Turkish children with Class III malocclusion and compare them with to those of children with clinically normal occlusion during the mixed dentition phase. Materials and Method: Lateral cephalometric radiographs of 80 children with Class III malocclusion (mean age, 10.23 years) and 80 subjects with normal occlusion (mean age, 10.79 years) were examined for the study. Mean values of 13 linear and 21 angular cephalometric parameters were measured and compared. Results: Sagittal skeletal measurements included SNB (Class III, 81.82 +/- 4.26; control group, 74.5 +/- 3.86; p <.001), ANB (Class III, -2.35 +/- 2.02; control group, 2.4 +/- 1.17; p <.0001), Pg to Nasion vertical (Class III, -5.70 +/- 2.68; control group, -9.60 +/- 3.21; p <.05), Wits appraisal (Class III, -5 +/- 4.57; control group, -0.8 +/- 2.44; p <.05), Co-A (Class III, 79.38 +/- 2.19; control group, 83.94 +/- 2.64; p <.01) and Co-Gn (Class III, 105.7 +/- 2.04; control group, 102.4 +/- 1.15; p <.05). Vertical skeletal analysis included Gonial angle (Class III, 132.6 +/- 7.15; control group, 122.1 +/- 6.6; p <.01), and S-Ar length (Class III, 28.31 +/- 0.9; control group, 30.2 +/- 1.4; p <.05). Dentoalveolar measurements included U1 to SN (Class III, 107.96 +/- 8.13; control group, 98.4 +/- 8.19; p <.05). Soft tissue measurements included soft tissue convexity (Class III, 173.4 +/- 3.68; control group, 165.9 +/- 3.25; p <.01). Conclusion: The findings of the study indicated that effective mandibular length was larger in Class III groups and effective maxillary length was smaller in Class III groups.
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    Comparison of Soft Tissue Cephalometric Norms between Turkish and European-American Adults
    (Hindawi Ltd, 2013) Celebi, Ahmet Arif; Tan, Enes; Gelgor, Ibrahim Erhan; Colak, Tugba; Ayyildiz, Erdem
    One of the most important components of orthodontic diagnosis and treatment planning is the evaluation of the patient's soft tissue profile. The main purpose of this study was to develop soft-tissue cephalometric standards for Turkish men and women and compare them with the cephalometric standards of normal European-American white people. The sample included 96 Turkish adults (48 women, 48 men), aged 20 to 27 years. Turkish subjects have increased facial convexity associated with retruded mandible, more obtuse lower face-throat angle, increased nasolabial angle and upper lip protrusion, deeper mentolabial sulcus, and smaller interlabial gap compared with European-American white people. It is appropriate to consider these differences during routine diagnosis and treatment planning of a Turkish patient or an American patient of European ancestry. Turkish males reveal more obtuse mandibular prognathism and upper lip protrusion, and smaller nasolabial angle than females.
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    Determination and Application of Pont's Index in Turkish Population
    (Hindawi Ltd, 2012) Celebi, Ahmet Arif; Tan, Enes; Gelgor, Ibrahim Erhan
    Disharmony between tooth size and dental arch size induces orthodontic problems. So, dental indices were identified by various authors. One of these is Pont who determined a method of prediction of the ideal dental arch width which has become known as Pont's Index. The purpose of this study was to assess the applicability of Pont's Index to a Turkish population and to compare the results with those obtained from studies of different ethnic subjects. The sample comprised 64 male subjects and 78 female subjects with age range from 14 to 15 years. Measurements were obtained directly from plaster casts; they included mesiodistal crown diameters of the four maxillary incisors, as well as interpremolar and intermolar maxillary arch widths as specified by Pont. Correlation coefficients determined between the measured arch width values and those calculated according to Pont's Index were low in all cases, with r values ranging from 0.02 to 0.36. It was concluded that Pont's Index should not be used to predetermine ideal arch width values in Turkish individuals.
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    Determination of Orthodontic Treatment Need for Individuals in Pubertal Growth Period and Effects of Different Variables on the Treatment Needs with Using the ICON Index
    (Aves Press Ltd, 2012) Kamak, Hasan; Gelgor, Ibrahim Erhan; Keklik, Hakan
    Aim: To evaluation of orthodontic treatment need for individuals who are in pubertal growth period with using the ICON index and whether treatment need change according to gender, dental, sagittal and vertical skeletal malocclusions. Subjects and Method: In this study, pretreatment orthodontic casts and panoramic films of 138 patients (75 females, 63 males and mean age 13.8 1,2) were investigated by using ICON index. Results: 97 of 138 patients (% 65,9) were found to be need for orthodontic treatment. Although it is not statistically significant, females in genders (% 69,3), Class 111 patients in dental malocclusions (% 71,4), and Class I and Class 11,1 anomalies in sagittal skeletal malocclusions were found higher than the others. Also, in vertical skeletal malocclusions, orthodontic treatment needs of hyper-diverjant patients (% 79,3) were found statistically higher than the others. Conclusion: The majority of individuals who were in pubertal growth period were female (% 54,3), dental Class 11 (% 70,3), skeletal Class I malocclusion (%55,8) and norrno-diverjant (%47,8). It was seen that when the vertical direction growth increased, the need for orthodontic treatment increased. As a result, studies about indexes should be done for comparison, sharing and proliferation of new information, and patients determination for orthodontic treatment should be done according to treatment needs rather than Angle classifications.
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    Distalization of Mandibular Molars Using Mini-Plate Anchorage Fixed on Ramus: Case Report
    (Aves Press Ltd, 2006) Uysal, Tancan; Gelgor, Ibrahim Erhan; Sari, Zafer; Dolanmaz, Dogan
    Distalization of the lower molars has been one of the most difficult biomechanical problems in the orthodontic treatments. Nowadays it has become possible to move mandibular molars distally with temporary skeletal anchorage systems to correct mandibular crowding and dental asymmetries without lower premolars extraction. In this study, the efficacy and potency of mini-plates in lower molar distalization were evaluated and skeletal, dental and soft tissue changes were analyzed with cephalometric radiographs and dental casts.
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    Effects of silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets
    (Univ Sao Paulo Fac Odontologia Bauru, 2011) Atsu, Saadet; Catalbas, Bulent; Gelgor, Ibrahim Erhan
    Objective: The aim of this study was to evaluate the effects of tribochemical silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets. Material and Methods: Twenty debonded metal and 20 debonded ceramic brackets were randomly assigned to receive one of the following surface treatments (n=10 for each group): (1) sandblasting (control); (2) tribochemical silica coating combined with silane. Brackets were rebonded to the enamel surface on the labial and lingual sides of premolars with a light-polymerized resin composite. All specimens were stored in distilled water for 1 week and then thermocycled (5,000 cycles) between 5-55 degrees C. Shear bond strength values were measured using a universal testing machine. Student's t-test was used to compare the data (alpha=0.05). Failure mode was assessed using a stereomicroscope, and the treated and non-treated bracket surfaces were observed by scanning electron microscopy. Results: Rebonded ceramic brackets treated with silica coating followed by silanization had significantly greater bond strength values (17.7 +/- 4.4 MPa) than the sandblasting group (2.4 +/- 0.8 MPa, P<0.001). No significant difference was observed between the rebonded metal brackets treated with silica coating with silanization (15 +/- 3.9 MPa) and the sandblasted brackets (13.6 +/- 3.9 MPa). Treated rebonded ceramic specimens primarily exhibited cohesive failure in resin and adhesive failure at the enamel-adhesive interface. Conclusions: In comparison to sandblasting, silica coating with aluminum trioxide particles followed by silanization resulted in higher bond strengths of rebonded ceramic brackets.
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    Use of Class Fiber to Reinforce Ortohodontic Plates Against Mechanical Forces Ibrahim Erhan Gelgor
    (Aves Press Ltd, 2006) Gelgor, Ibrahim Erhan; Catalbas, Bulent
    This study investigated the different effects of quantitative percentages of glass fiber intensity on the transverse strength and maximum deformation of orthodontic acrylic resin. Forty specimens were formed in a specially designed mold to produce identical specimens in accordance with the manufacturer's recommendations. Four different percentages of glass fiber reinforcements in loose random form were studied. Each glass fiber treatment percentage (0%, 1%, 2%, 5%) was related to the total powder/liquid mass. The results indicated that 2% glass fiber treatment enhanced the transverse strength of the tested specimen. Maximum deformation at failure in the tested treatment groups was found to be different. The interaction of glass fiber concentration on fracture strength and deformation was significant. In conclusion the 2% glass fiber concentration was found to yield optimum fracture strength and deformation results. Increased amount of glass fiber incorporation resulted in decreased mechanical properties of the resin.