Apical Root Resorption of Endodontically Treated Teeth after Orthodontic Treatment: A Split-mouth Study

Objective:The influence of pulp status on orthodontically induced root resorption has attracted attention. The purpose of this study was to compare orthodontically induced root resorption in endodontically treated teeth and their contralateral vital teeth in a split-mouth design.Methods:The sample included 173 patients who had at least one endodontically treated tooth, and their vital contralateral teeth served as the control group before the completion of orthodontic treatment. Apical root resorption measurements were performed by the comparison of digital panoramic X-ray images obtained at the beginning and at the end of the orthodontic treatment. Kruskal-Wallis, Mann-Whitney U, and Wilcoxon tests were used for statistical analysis.Results:There was no statistically significant difference in apical root resorption between the endodontically treated teeth and the contralateral teeth (p>0.05). Sex and tooth type had no effect on apical root resorption both in the endodontically treated teeth and the contralateral vital teeth (p>0.05). Orthodontic treatment with extraction caused more apical root resorption in the vital teeth than in the endodontically treated teeth (p0.05).Conclusion:Endodontic treatment does not produce greater apical root resorption compared with the vital teeth

Use of cone-beam computed tomography to evaluate root and canal morphology of mandibular first and second molars in Turkish individuals

Objective: The aim of this study was to investigate the root and canal morphology of mandibular first and second molars in a Turkish population by using cone beam computed tomography (CBCT). Study design: CBCT images of mandibular first (n = 823) and second molar (n = 925) teeth from 605 Turkish patients were analyzed. The root canal configurations were classified according to the method of Vertucci. Results: The majority of mandibular molars (95.8% of first molars, 85.4% of second molars) had two separate roots; however, three roots were identified in 2.06% of first molars and 3.45% of second molars. C-shaped canals occurred 0.85% of first molars and 4.1% of second molars. Three canals were found in 79.9% of first molars and 72.8% of second molars. Most distal roots had a simple type I configuration, whereas mesial roots had more complex canal systems, with more than one canal. The most common root morphology of first and second molars is the two rooted morphology with three canals. Both the mesial and distal roots showed wide variations in canal anatomy with type IV and type I canal configuration predominating in the mesial and distal roots, respectively. Conclusion: Vertucci type I and IV canal configurations were the most prevalent in the distal and mesial roots, respectively, of both the mandibular first and second permanent molar teeth

Assessment of the marginal microleakage of flowable composites in class V cavities prepared by Er:YAG laser and high-speed bur

Amaç: Bu çalışmanın amacı, Er:YAG lazer ya da yüksek hızlı döner aletler ile kavite hazırlığı yapılan ve üç farklı akışkan kompozit materyali kullanılarak gerçekleştirilen sınıf V restorasyonlarda kenar mikrosızıntılarının incelenmesidir. Gereç ve Yöntem: Bu in-vitro çalışmada, toplam 33 adet üçüncü büyük azı dişlerinin bukkal ve lingual yüzeylerinde Er:YAG lazer ya da frez kullanılarak sınıf V kaviteler hazırlanan örnekler altı gruba (n=11) ayrıldı ve üretici firmanın talimatlarına uygun olarak üç farklı akışkan kompozit ile restore edildi. Grup 1: Lazer ile hazırlık (lh)+Estelite Flow Quick High flow (EF); Grup 2: lh+G-aenial Flo (GF); Grup 3: lp+Herculite XRV Ultra Akış (HF); Grup 4: Frez ile hazırlık (fh)+EF; Grup 5: fh+GF; Grup 6: fh+HF. Isısal çevrim uygulanmasının ardından örnekler %0,5 metilen mavisi solüsyonunda 24 saat süresince bekletildi. Boya penetrasyonu sonucu oluşan mikrosızıntı, stereomikroskop altında x40 büyütme ile incelendi. Verilerin analizinde Kruskal Wallis ve Mann-Whitney U testleri kullanıldı (p0.05). In terms of gingival and occlusal surfaces, no statistically significant difference in microleakage was observed among all groups (p>0.05). Conclusion: Class V cavity preparations with high-speed bur and Er:YAG laser, and the use of different flowable composites did not influence the microleakage at the gingival or occlusal margins