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    Effects of chincup or facemask therapies on the orofacial airway and hyoid position in Class III subjects
    (URBAN & VOGEL, 2015) Akin, Mehmet; Ucar, Faruk Izzet; Chousein, Chousein; Sari, Zafer
    The purpose of this work was to evaluate orofacial airway dimensions and the position of the hyoid bone related to changes induced by facemask therapy (combined with rapid palatal expansion) or by chincup therapy as compared to an untreated Class III control group. In all, 67 patients with skeletal Class III malocclusion were divided into a facemask group (n = 25; 15 girls and 10 boys), a chincup group (n = 15; 16 girls and 9 boys), and a control group (n = 17; 9 girls and 8 boys). Hard- and soft-tissue parameters were analyzed on lateral cephalograms, which were available for all patients and included a baseline radiograph (T1) obtained before treatment and a follow-up radiograph (T2) taken upon completion of active treatment or, in the control group, after a 6-month interval. Statistical analysis was performed at the p a parts per thousand currency signaEuro parts per thousand 0.05 level and included a paired-sample t-test, a generalized linear mixed model (GLMM), and a post hoc Tukey test. In the chincup group, significant changes in the perpendicular distance from the hyoid (H) to the C3-Me line were found compared to the control group (p < 0.05). The facemask group, by contrast, showed significant anteroposterior width increases of the pharynx-as measured at the level of the soft palate (p < 0.001)-as well as significant area increases of the nasopharynx based on its anterior portion (p < 0.001) and on its total area (p < 0.001). Both the chincup and the facemask (combined with rapid palatal expansion) therapies were found to induce clockwise rotational effects on the mandible. Orofacial airway dimensions were enlarged significantly by facemask treatment in comparison with both chincup treatment and with the control group.
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    Effects of different surface treatments on shear bond strength between ceramic systems and metal brackets
    (TAYLOR & FRANCIS LTD, 2017) Cevik, Pinar; Karacam, Nejla; Eraslan, Oguz; Sari, Zafer
    The aim of this study was to evaluate the shear bond strength of orthodontic brackets bonded to different kinds of ceramic surfaces after different surface conditioning methods. A total of 120 ceramic disks were divided into two main groups in terms of feldspathic or lithium disilicate. Each ceramic group was further subdivided into six subgroups depending on surface treatment (n = 10). The ceramic surfaces were conditioned by one of the following methods: Group C: control group; Group P: %37.5 orthophosphoric acid; Group HF: %9.6 hydrofluoric acid; Group L: Nd-YAG laser irradiation; Group SB: sandblasting with 50 mu m Al2O3 particles; and Group DB: grinding with a diamond bur. Surface roughness value was evaluated with a digital profilometer. Surface topographies of one specimen from each group were observed by atomic force microscopy (AFM) after surface treatments. All samples were primed with silane before the bracket bonding, including the control group. Metal brackets were bonded to the specimens with a light curing composite resin. The samples were stored in distilled water for 24 h and thermocycled 2500x at 5 and 55 degrees C for 30 s. Shear bond strengths between the ceramic surface and the bracket were measured with a universal testing machine at a crosshead speed of 0.5 mm/min. Failure modes were classified as adhesive, cohesive, or mixed. Data were analyzed using ANOVA and Tukey's tests (alpha =.05). Group SB had significantly rougher surface compared with the other groups in each ceramic system (p <.05), and Group SB demonstrated significantly higher shear bond strengths than other groups as well. Within the limitations of this study, surface conditioning methods, except for sandblasting and grinding, were associated with lower shear bond strengths; however, thermocycling may have had negative effects on bond strengths of specimens. Furthermore, in each ceramic system, there was a significant difference between surface-conditioning methods and surface roughness with regard to shear bond strength.
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    Occlusal Contact Changes with Removable and Bonded Retainers in a 1-Year Retention Period
    (E H ANGLE EDUCATION RESEARCH FOUNDATION, INC, 2009) Sari, Zafer; Uysal, Tancan; Basciftci, Faruk Ayhan; Inan, Ozgur
    Objective: To test the hypothesis that there is no difference in the number of occlusal contacts in centric occlusion in patients treated with bonded and removable retention procedures and a control group during a 1-year retention period. Materials and Methods: Twenty-five patients received a removable Hawley retainer, and 25 patients received maxillary and mandibular bonded retainers. The retainer patients were compared with 20 control subjects with normal occlusions. Silicone-based impression bites were used to record occlusal contacts. Paired-sample t-test, analysis of variance (ANOVA), and Tukey tests were used to evaluate intragroup and intergroup differences. Results: An increased number of occlusal contacts were recorded in total-arch and posterior combined (actual/near) teeth during the retention period as compared with the control group. In the Hawley group, actual and total contacts on the first and second molar and actual contacts on the premolar and canine showed statistically significant increases. In the bonded retainer group, near and total contacts on the first and second molars and premolars showed statistically significant increases. Slight occlusal changes were seen in the control sample during the observation period, presumably from growth and development. ANOVA comparisons of total contacts of anterior and posterior teeth indicated statistically significant differences in the three groups on posterior segments. Conclusions: The hypothesis is rejected. Both retention procedures allowed relative vertical movement of the posterior teeth, but the number of contacts on the posterior segment was increased more in the bonded retainer group than in the Hawley and control groups at the end of retention. (Angle Orthod. 2009;79:867-872.)
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    Occlusal contacts with different retention procedures in 1-year follow-up period
    (MOSBY-ELSEVIER, 2007) Basciftci, Faruk Ayhan; Uysal, Tancan; Sari, Zafer; Inan, Ozgur
    Introduction: The aim of this follow-up study was to evaluate the number of contacts in centric occlusion during a 1-year retention period in patients treated with 2 retention procedures and in a control sample. Methods: Twenty patients received modified wraparound Hawley retainers, and 20 received maxillary Jensen plates with mandibular fixed retainers. These retention patients were compared with a control group of 20 subjects with normal occlusions. Silicone-based impression bites were used to record occlusal contacts. Paired and independent-sample t tests were used to evaluate intragroup and intergroup differences. Results: Contacts increased in the total arch and the posterior combined (actual/near) during the retention period compared with the control group. In the Hawley retainer group, actual contacts on the second molars (P < .05), near contacts on the premolars (P < .05), and total contacts on the first molars (P < .05) and premolars (P < .01) had statistically significant increases. In the maxillary Jensen plate and mandibular fixed lingual retainer group, the number of actual contacts on the posterior segment increased. Actual contacts on the first molars (P < .01), second molars (P < .01), premolars (P < .05), and canines (P < .05), and total contacts on the first (P < .05) and second (P < .05) molars had statistically significant increases. During the observation period, some slight occlusal changes were seen in the control sample, presumably from growth and development. At the end of the study, during the 1-year follow-up period, no statistically significant occlusal contact differences were observed in the 3 groups. Conclusions: Retention procedures carried out in this study allowed relative vertical movement of the posterior teeth.
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    PAX9 Polymorphisms and susceptibility with sporadic tooth agenesis in Turkish populations: a case-control study
    (BIOMED CENTRAL LTD, 2013) Isman, Eren; Nergiz, Suleyman; Acar, Hasan; Sari, Zafer
    Background: Hypodontia, the congenital absence of one or a few teeth is one of the most common alterations of the human dentition. Familial hypodontia is caused by mutations in PAX9, Msx1 and Axin2 genes. Limited numbers of studies are present to show etiological factors beyond this anomaly in Turkish community belonging to Caucasian racial family. The purpose of this study is to investigate the relationships between the two different single nucleotide polymorphisms that are G-1031A and T-912C with hypodontia in Caucasians. 200 individuals having hypodontia and 114 normal individuals having all 32 teeth present were selected for the study. Blood samples were collected from each individual and DNA was extracted. To determine the polymorphisms, PCR-RFLP method was used. Results: The outcomes suggest that the individuals having AC haplotype carry less risk in having hypodontia compared with the rest of the haplotype groups (OR = 3.88; CI = 95%; p = 0.001). The ratio of GT haplotype is less in the hypodontia group meaning that the GT carriers are in risk group in terms of hypodontia risk. Conclusion: These results indicate that polymorphisms in the promoter region of PAX9 gene may have an influence on the transcriptional factors and activity of this gene and are associated with hypodontia in Caucasian individuals.