Ortodonti / Orthodontics
http://hdl.handle.net/20.500.12566/410
2024-03-29T06:20:56ZÇekimli ortodontik tedaviler sonucunda 3.molar dişlerin konumlarının incelenmesi
http://hdl.handle.net/20.500.12566/1102
Çekimli ortodontik tedaviler sonucunda 3.molar dişlerin konumlarının incelenmesi
Kale, Burak; Büyükçavuş, Muhammed Hilmi
Aim: The aim of this study was to compare the changes in the eruption space and inclinations of the mandibular third molars by orthodontic treatments with and without premolar tooth extraction. Materials & Methods: In this study, panoramic radiographs of 53 treated individuals (24 males, 29 females) were used. Group 1 consisted of 18 (9 males, 9 females) of the same age group, 18(8 males, 10 females) of the first premolar, 27 (17 males, 10 females) of the second group. The inclination of the mandibular third molars and eruption space of the second molars was measured by the same investigator on initial and final radiographs. The changes in the angle of the third molars with the reference plane and the eruption space were compared with the one-way ANOVA. Results: The age range of the individuals was 14.18 to 15.05 and the duration of treatment ranged from 1.87 to 2.13 years. There was no difference between the groups in terms of gender differences, mean age and duration of observation between men and women. There was no statistically significant difference between the angle and eruption space of the mandibular third molars before treatment. A statistically significant difference was found between Groups 2 and 3. Significant differences were found between the eruption spaces between all groups. Conclusions and Suggestions: By extraction of the second premolar, the angle of the untreated third molars can be improved for erupting into the arch. Non-extraction treatment has little effect on the angle and positions of the third molars.; Amaç: Çalışmamız premolar diş çekimli ve diş çekimsiz ortodontik tedavilerin mandibular üçüncü molarlar için oluşturduğu sürme boşluğu miktarı ve üçüncü molar eğimlerindeki değişiklikleri karşılaştırmayı amaçlamaktadır. Gereç ve Yöntem: Bu retrospektif klinik çalışmada tedavi edilmiş 53 bireyin (24 erkek, 29 kadın) standart panoramik radyografileri kullanılmıştır. Grup 1, 18 (8 erkek, 10 kadın) birinci premoları çekilen, 2.Grup 17 (7 erkek,10
kadın) ikinci premoları çekilen, 3.Grup ise diş çekimi yapılmayan 18 (9 erkek,9 kadın) benzer yaş grubundaki bireylerden oluşmaktadır. Referans düzlemiyle diş tomurcuğunun uzun ekseni arasında, sağ ve sol Z noktalarının ikinci molarların en distal noktası arasındaki mesafe aynı araştırmacı tarafından başlangıç ve bitim radyografiler üzerinde ölçümler yapılmıştır. Üçüncü molarların referans düzlemiyle yaptığı eğimlerindeki ve sürme
boşluğundaki değişiklikler tek yönlü ANOVA ve Tukey Post-Hoc testleriyle karşılaştırılmıştır. Bütün testler için önem seviyesi p<0.05 olarak belirlenmiştir. Bulgular: Bireylerin yaş aralıkları 14.18 ile 15.05 olup tedavi süreleri ise 1.87 ile 2.13 yıl arasındadır. Gruplar arasında kadınlar ve erkekler arasında cinsiyet farklılığı, ortalama yaş ve gözlem süreleri arasında bir
farklılık bulunmamıştır. Tedavi öncesi gruplar arası mandibular 3.molarların eğimleri ve sürme boşluğu karşılaştırmalarında istatistiksel olarak bir fark bulunmamıştır. Grup 2 ve 3 arasında istatistiksel olarak farklılık bulunmuştur. Sürme boşlukları arasında tüm gruplar arasında anlamlı farklılık bulunmuştur. Sonuç: İkinci premolarların çekimi ile sürmemiş üçüncü molarların eğimleri iyileştirilerek ark içerisine sürmeleri için uygun boşluk oluşturulabilir. Çekimsiz tedavi, üçüncü molarların eğimlerinde ve konumların çok az etkisi
olmaktadır.
2021-01-01T00:00:00ZEffects of different types of maxillary protraction on maxilla with finite element analysis
http://hdl.handle.net/20.500.12566/1101
Effects of different types of maxillary protraction on maxilla with finite element analysis
Büyükçavuş, Muhammed Hilmi; Kale, Burak
Objective: To compare two different skeletal anchorage methods with finite element analysis in the treatment of Class III patients with maxillary retrognathia. Material and Methods: Two different treatment scenarios were performed on skull model obtained from computerized tomography images of skeletal Class III patients with maxillary retrognathia and finite element analysis was performed. In the first group; mini plates were simulated on infra zygomatic crest. A unilateral 500 g protraction force was applied to the face-mask. In the second group; mini plates were simulated in infrazygomatic crest and mandibular symphysis. Then, 500g protraction force was applied with Class III elastic between the miniplates. Von Misses stresses and displacement values were evaluated comparatively. Results: In Class III elastic group, maximum Von Misses stress occurred around infra zygomatic crest and symphysis anchored with 0.078 MPa. The maxillary posterior region and paranasal regions were the areas showing the highest Von Misses tension after infra zygomatic crest and symphysis. In the face-mask group, the most common site of Von Misses stress in nasomaxillary complex and alveolar structures were infra zygomatic area where plaques were applied, followed by pterygomaxillary suture. Tensile forces are reduced especially in these two areas by spreading to surrounding structures. Conclusion: In both methods, it was determined that the amount of force transmitted to circumaxillary sutures was sufficient to induce the formation of osteogenesis in these regions.
2021-01-01T00:00:00ZDetermining the short-term effects of different maxillary protraction methods on pharyngeal airway dimensions
http://hdl.handle.net/20.500.12566/1100
Determining the short-term effects of different maxillary protraction methods on pharyngeal airway dimensions
Kale, Burak; Büyükçavuş, Muhammed Hilmi
Objective: This study sought to evaluate the effects of different maxillary protraction methods on the pharyngeal airway in Class III patients with maxillary retrognathia. Setting and Sample Population: A total of 59 individuals (31 females and 28 males) with a mean age of 11.38 ± 1.24 years were included in this study. Material and Methods: Fifty- nine treated maxillary retrognathic patients who underwent different protraction methods were evaluated. Twenty patients treated with RME (Rapid Maxillary Expansion) made up the first group, and 20 patients treated with 5- week Alt- RAMEC (Alternate Rapid Maxillary Expansion and Constriction) protocol comprised the second group. Lastly, 19 patients on whom face masks with miniplates were applied were included in the skeletal anchorage (SA) group. Sixteen linear and four areal pharyngeal airway measurements were made on lateral cephalograms before and after treatment. Differences between the groups were assessed using analysis of variance (ANOVA) tests. Results: The mean maxillary protraction levels were determined as 2.7, 3.69 and 4.01 mm in the RME, Alt- RAMEC and SA groups, respectively. In the nasopharynx, AD1- PNS, AD2- PNS, PNS- Ba and PNS- Ho measurements revealed a significant increase in the SA group compared to the other groups (P < .05). In the oropharynx, PNS- Ep measurement increased significantly in the RME group (P < .05). In the total pharyngeal airway area, an increase was detected in the SA, Alt- RAMEC, and RME groups. Conclusion: The most effective protraction method in terms of pharyngeal airway dimensions, especially in the nasopharynx, is the application of the face mask with skeletal anchorage. A greater increase in vertical airway length (PNS- Ep) was observed with RME.
2021-01-01T00:00:00ZSkeletal and dental effects of twin-block appliances in patients treated with or without expansion
http://hdl.handle.net/20.500.12566/1087
Skeletal and dental effects of twin-block appliances in patients treated with or without expansion
Büyükçavuş, Muhammed Hilmi; Kale, Burak
Objective: To compare the skeletal and dental effects of twin-block appliances with or without expansion. Methods: From our archives, patients using twin-block appliances were selected. A total of 20 patients with expansion screws were classified as group 1 (10 male, 10 female; mean age 12.48 ± 1.38 years), and 18 patients without screws as group 2 (8 male, 10 female; mean age 12.81 ± 1.16 years). Cephalometric radiographs at pre-and post-treatment were used to evaluate skeletal and dentoalveolar
parametric changes; study models and posteroanterior radiographs were used for transverse evaluation. The initial measurements and the treatment-related mean changes within the study groups were analyzed using the Student’s t-test. Results: Changes in maxillary skeletal measurements were not statistically significantly different between groups except for A-VRL
(P > .05). Mandibular measurements showed an increase in SNB (º) and Co-Gn distance in both groups. However, these changes were similar for both groups (P > .05). The maxillary measurements showed that incisors were proclined in the expansion group and retroclined in the non-expansion group. No significant difference was found between the groups in terms of changes in the skeletal transversal measurements (P > .05). On the study models, the changes in maxillary intercanine and intermolar widths, and in arch length differed to a statistically significant degree between groups (P < .05). Conclusion: The skeletal effects of 2 different types of twin-block appliances in the transversal direction were similar; it was deter mined that dental expansion was obtained in the maxilla by adding screws to the twin-block appliances.
2021-01-01T00:00:00Z