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https://hdl.handle.net/20.500.12933/37
2024-03-29T06:58:55ZDiş Köklerini Etkileyen Gelişimsel Anomaliler
https://hdl.handle.net/20.500.12933/894
Diş Köklerini Etkileyen Gelişimsel Anomaliler
Güçyetmez Topal, Burcu; Tıraş, Melike
Diş gelişimi, dental epitelyal ve nöral krestten gelişmiş mezenşimal hücreler arasındaki etkileşim sonucu meydana gelmektedir. Epitelyal-mezenşimal etkileşimin bozulması, normal odontogenezi değiştirerek gelişimsel anomalilere sebep olmaktadır. Gelişimsel anomaliler, dişin kronunu, kökünü veya her ikisini birden etkileyebilmektedir. Gelişimsel anomalilerin etkilerini kronlarda klinik olarak incelemek mümkünken, kökler üzerindeki etkileri hem klinik hem radyolojik inceleme gerektirmektedir. Bu nedenle çoğu gelişimsel anomalilerin kökler üzerindeki etkilerini teşhis etmek zorlaşmakta ve çoğu zaman diş kaybına kadar gidebilecek ciddi komplikasyonlara yol açana kadar gözden kaçabilmektedir.Kalıtım, mutasyon gibi genetik etkenler, çevresel faktörler, metabolik bozukluklar, diş köklerinde gelişimsel sayı, şekil, boyut veya yapı anomalilerine yol açmaktadır. Görülen anomaliler sendromlarla ya da sistemik hastalıklarla da ilişkili olabilir. Bu makalede, diş köklerini etkileyen gelişimsel sayı, biçim ve yapı anomalilerinin derlenmesi amaçlanmıştır.; Dental development is the result of the interaction between advanced mesenchymal cells from the dental epithelial and neural crest. Disruption of epithelial-mesenchymal interaction causes developmental anomalies by altering normal odontogenesis. Developmental anomalies can affect the tooth's crown, root, or both. While it is possible to clinically examine the effects of developmental anomalies in crowns, the effects on roots require both clinical and radiological examination. For this reason, it becomes difficult to diagnose the effects of most developmental anomalies on the roots and can often be overlooked until they lead to serious complications that can lead to tooth loss. Genetic factors such as heredity, mutation, environmental factors, metabolic disorders, developmental number, shape, size, or structure of the tooth roots lead to anomalies. The anomalies may also be associated with syndromes or systemic diseases. This article is intended to compile developmental number, shape, and structure anomalies affecting tooth roots.
2020-01-01T00:00:00ZRelationship of forehead aesthetics with frontal sinus size and skeletal malocclusions
https://hdl.handle.net/20.500.12933/859
Relationship of forehead aesthetics with frontal sinus size and skeletal malocclusions
Camcı, Hasan
Introduction Forehead inclination and aesthetics have received very limited attention, although forehead is critically important in obtaining total facial aesthetics. The aim of this study was to evaluate the relationship between frontal sinus fields, forehead morphology, and skeletal malocclusion. Materials and Methods A total of 224 extraoral lateral photographs and cephalometric radiographs from skeletal class I, class II and class III patients in the post-pubertal period were investigated. Extraoral photographs and cephalometric radiographs were superimposed for each patient before measurements. The photographs were evaluated in three groups: Group A: Skeletal Class I malocclusions (n = 85), Group B: Skeletal Class II malocclusions (n = 74), Group C: Skeletal Class III malocclusions (n = 65). All subjects from the three groups were classified according to the types of the foreheads, and then on the photographs, four different angle measurements (A1, A2, A3, A4) were performed. In addition, the frontal sinus (FS) fields were calculated using the RadiAnt Dicom Viewer (Beta version) on cephalometric and posterior-anterior radiographs. One-way ANOVA, Chi-square, and Student t tests were used for statistical evaluation. Results No significant relationships between the skeletal malocclusions and the forehead types were seen. In Group C, the FS fields and A2 angles were higher than in the other groups. No gender-related variations were detected for any measurements. Conclusion There was a limited correlation between malocclusions, frontal sinus, and forehead morphology. Gender was not an element that creates morphological differences in forehead aesthetics.
2020-01-01T00:00:00ZEffects of whitening toothpastes on the esthetic properties and surface roughness of a composite resin
https://hdl.handle.net/20.500.12933/849
Effects of whitening toothpastes on the esthetic properties and surface roughness of a composite resin
Yılmaz, Merve Nur; Gül, Pınar; Ünal, Mehmet; Turgut, Güven
Purpose: The aim of this study was to investigate and compare the effects
of some whitening toothpastes on the surface roughness and coloration
susceptibility of a composite resin, as well as their whitening effectiveness.
Methods: This study was carried out in two different stages. In experiment A, samples were divided into 7 subgroups to compare the surface
roughness and coloration susceptibility of the composite resin: distilled
water, conventional toothpaste, and 5 different whitening toothpastes. In
experiment B, samples were divided into 8 subgroups to compare the whitening effectiveness of the whitening toothpastes: conventional toothpaste,
5 other whitening toothpastes, and two bleaching groups. After toothbrushing simulation, the color and surface roughness of the samples were
measured. Data were subjected to one-way analysis of variance, paired
t-test and Tukey post-hoc test (α = 0.05).
Results: There were no statistically significant differences among the
surface roughness values for the groups for any period before and after
brushing (P > 0.05). In terms of the coloration susceptibility of the composite resin and the whitening effects of the toothpastes, no statistically
significant differences were evident among the groups for any period
before and after brushing (P > 0.05).
Conclusion: The results of this study indicate that effective toothbrushing
is more important than the type of toothpaste employed.
0002-01-01T00:00:00ZEvaluation of surface roughness after root resection: An optical profilometer study
https://hdl.handle.net/20.500.12933/842
Evaluation of surface roughness after root resection: An optical profilometer study
Ekici, Ömer; Aslantaş, Kubilay; Kanık, Özgür; Keleş, Ali
The aim of this study was to evaluate the roughness of the apical surface after apicalresection performed by six different methods with an optical profilometer. Sixtyhuman single root premolar teeth were used in this in vitro study. After root canalpreparation, root canals were filled with gutta-percha and AH Plus root canal sealersby lateral condensation technique. The teeth were randomly divided into six groupsaccording to the apical resection method: steel fissure bur, tungsten carbide fissurebur, Lindeman bur, diamond fissure bur, laser, and ultrasonic surgical piezo with a dia-mond tip. The root ends were resected 3 mm away from the root apex and at a 90 angle. The time required for apicectomy was recorded for each group. After apicalresection, the root surfaces were analyzed by an optical profilometer. The Kruskal–Wallis method was used to analyze the differences between groups. The significancelevel was set at 5%. The roughest surfaces were obtained by laser (25.54 ± 9.01μm)and Lindeman bur (17.35 ± 6.03μm), respectively. The longest mean resection timeswere recorded in piezosurgery and laser surgery (57 ± 14.39 s and 50.9 ± 16.86 s),respectively. Although the diamond-tipped piezo surgical cutting time is long, it hasthe best results in terms of surface roughness (5.50 ± 1.73μm). The optical pro-filometer is a more convenient tool for evaluating the surface after apical surgery, asit provides an opportunity to evaluate objectively with both visual andnumerical data.
0025-01-01T00:00:00Z