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Öğe Comparison of 2 distalization systems supported by intraosseous screws(Mosby-Elsevier, 2007) Gelgör, İbrahim Erhan; Karaman, Ali İhya; Büyükyılmaz, TamerIntroduction: The aim of this study was to compare the effects of 2 distalization systems supported by intraosseous screws for maxillary molar distalization. Methods: Forty subjects with skeletal Class I dental Class II malocclusion were divided into group 1 (8 girls, 12 boys) and group 2 (11 girls, 9 boys). An anchorage unit was prepared by placing an intraosseous screw in the premaxillary area of each subject. To increase the anchorage in group 2, we used an acrylic plate resembling the Nance button around the screw. The screws were placed and immediately loaded to distalize the maxillary first molars or second molars when they were present. Skeletal and dental changes were measured on cephalograms, and dental casts were obtained before and after distalization. Results: The average distalization times were 4.6 months for group 1 and 5.4 months for group 2. On the cephalograms, the maxillary first molars were tipped 9.05 degrees in group 1 and 0.75 degrees in group 2. The mean distal movements were 3.95 mm in group 1 and 3.88 mm in group 2. On the dental casts, the mean distalization amounts were 4.85 mm for group 1 and 3.70 mm for group 2. In group 1, the maxillary molars were rotated distopalatally to a moderate degree, but this was not significant in group 2. Mild protrusion of the maxillary central incisors was also recorded for group 1 but not for group 2. However, there were no changes in overjet, overbite, and mandibular plane angle measurements for either group. Conclusions: Immediately loaded intraosseous screw-supported anchorage units were successful for molar distalization in both groups. In group 2, side effects such as molar tipping and rotation were smaller, but distalization times were longer and hygiene was poorer.Öğe Effects of Different Chlorhexidine Formulations on Shear Bond Strengths of Orthodontic Brackets(E H Angle Education Research Foundation, Inc, 2009) Çatalbaş, Bülent; Ercan, Ertuğrul; Erdemir, Ali; Gelgör, İbrahim Erhan; Zorba, Yahya OrcunObjective: To test the hypothesis that the application of different chlorhexidine formulations to the etched enamel will not affect shear bond strength (SBS). Materials and Methods: Forty-four freshly extracted human premolars; were collected and stored in distilled water. The teeth were etched with 37% phosphoric and were rinsed and dried. The teeth then were divided into four equal groups. While Group 1 served as a control, Groups 2 to 4 were treated before bonding with a chlorhexidine formulation that included solution (2%), gel (1%), and mouthwash (0.2%). Orthodontic brackets were bonded with Transbond XT (3M Unitek, Monrovia, Calif). Bond strength results were evaluated with the use of one-way analysis of variance (ANOVA) (P < .05) and post hoc tests. Modes of failures were verified by means of scanning electron microscopy. Results: Although no statistically significant difference was observed between Groups 1 and 4 (P > .05), both were statistically superior to Groups 2 and 3 (P < .05). In this in vitro study, the observed measures for Groups 2 and 3 (14.5-10.6 MPa) were lower than those for Groups 1 and 4 (27.3-24.9 MPa), but these values were much higher than those required for clinical use (6-8 MPa). Conclusion: The hypothesis is rejected. The application of chlorhexidine mouth rinse before bonding had no significant effect on the SBS value, and the application of chlorhexidine solution and gel significantly decreased SBS. (Angle Orthod. 2009;79:312-316.)Öğe Effects of silica coating and silane surface conditioning on the bond strength of metal and ceramic brackets to enamel(E H Angle Education Research Foundation, Inc, 2006) Atsu, Saadet Sağlam; Gelgör, İbrahim Erhan; Şahin, VolkanObjective: To evaluate the effect of tribochemical silica coating and silane surface conditioning on the bond strength of metal and ceramic brackets bonded to enamel surfaces with light-cured composite resin. Materials and Methods: Twenty metal and 20 ceramic brackets were divided into four groups (n = 10 for each group). The specimens were randomly assigned to one of the following treatment conditions of the metal and ceramic brackets' surface: (1) tribochemical silica coating combined with silane and (2) no treatment. Brackets were bonded to the enamel surface on the labial and lingual sides of human maxillary premolars (20 total) with a light-polymerized resin composite. All specimens were stored in water for 1 week at 37 degrees C and then thermocycled (5000 cycles, 5 degrees C to 55 degrees C, 30 seconds). The shear bond strength values were measured on a universal testing machine. Student's t-test was used to compare the data (alpha = 0.05). The types of failures were observed using a stereomicroscope. Results: Metal and ceramic brackets treated with silica coating with silanization had significantly greater bond strength values (metal brackets: 14.2 +/- 1.7 MPa, P < .01; ceramic brackets: 25.9 +/- 4.4 MPa, P < .0001) than the control groups (metal brackets: 11.9 +/- 1.3 MPa; ceramic brackets: 15.6 +/- 4.2 MPa). Treated specimens of metal and ceramic exhibited cohesive failures in resin and adhesive failures at the enamel-adhesive interface, whereas control specimens showed mixed types of failures. Conclusions: Silica coating with aluminum trioxide particles coated with silica followed by silanization gave higher bond strengths in both metal and ceramic brackets than in the control group.Öğe Kemik rezorbsiyonunda rol alan ve mini implantların başarısını etkileyen faktörlerin incelenmesi(Kırıkkale, 2010) Gelgör, İbrahim Erhan; Çelebi, Ahmet Arif; Arıkan, Şevket; Demirer, Serhat; Çatalbaş, Bülent…Öğe Non-surgical treatment of Class III malocclusion in adults: Two case reports(2005) Gelgör, İbrahim Erhan; Karaman, Ali İhyaClass III malocclusions are usually growth-related discrepancies, which often become more severe until growth is complete. The surgery can be part of the treatment plan. The purpose of this report is to review the orthodontic treatment of two patients with a Class III malocclusion who were treated non-surgically. The basis for this treatment approach is presented and the final treatment result reviewed. Important factors to consider when establishing a Class III molar relationship are discussed. © 2005 British Orthodontic Society.Öğe Prosthetic and orthodontic rehabilitation of a patient with missing maxillary lateral incisors: A case report(2007) Gür, Emel; Aykent, Filiz; Gelgör, İbrahim ErhanIPS Empress 2 materials can be used for fabrication of short-span fixed partial dentures in the anterior region as well as single crowns. This clinical report describes the prosthodontic treatment of a 16-year-old male patient with missing permanent maxillary left and right incisors with IPS Empress 2 fixed partial dentures following orthodontic treatment. © 2007 by Quintessence Publishing Co Inc.Öğe The use of parental data to evaluate soft tissues in an Anatolian Turkish population according to Holdaway soft tissue norms(Mosby Inc., 2006) Gelgör, İbrahim Erhan; Karaman, Ali İhya; Zekiç, EsadIntroduction: The relative influence of genetic and environmental factors in the etiology of malocclusion has long been a matter for discussion. The aim of this study was to compare the soft tissue structures of parents and their prepubertal, pubertal, and postpubertal offspring according to the Holdaway soft tissue norms to determine the similarity among them. Differences related to age and sex between the parents and offspring were also evaluated. Methods: Lateral cephalometric radiographs were used to determine the similarities in soft tissue structures in 120 families, which were divided into prepubertal (n = 40), pubertal (n = 40), and postpubertal (n = 40) groups according to the children's skeletal ages. A total of 12 variables (2 angular and 10 linear) were measured according to Holdaway's soft tissue analysis. Pairs were formed between family members (mother to son, mother to daughter, father to son, father to daughter, midparent (mean of the father's and mother's values) to son, and midparent to daughter) in each group. Descriptive statistics and multiple linear regression analysis were performed. Results: Statistically significant correlations between parents and their offspring were found. The parental data showed that a mother's genetic influence on her child's soft tissues was greater than the father's. Moreover, it was found that daughters had greater genetic influences from their parents than did sons. As age increased, the similarity was greater. Soft tissue facial angle (?: 0.671), soft tissue chin thickness (?: 0.549), and basic upper lip thickness (?: 0.537) were the most similar variables between parents and their offspring. Conclusions: A few selected cephalometric measurements of the parents might furnish important data to the clinician in predicting a child's facial growth characteristics and aging process. Copyright © 2006 by the American Association of Orthodontists.
