Ali Keleş

This study evaluated four file systems (WaveOne Gold, Reciproc Blue, ProTaper Next and TruNatomy) for their shaping efficacy in oval‐shaped maxillary premolar root canals using micro‐CT. Twenty‐four extracted premolars, each with two roots, were randomly divided into four groups ( n = 6 teeth/group) and instrumented following manufacturer guidelines. Pre‐ and post‐instrumentation micro‐CT scans were performed. Key parameters analysed included unprepared canal surface area (% Un‐PrepCA), changes in canal area and volume (ΔCA, ΔCV and their percentages), canal transportation and centring ability. Statistical significance was set at p < 0.05. While no significant differences were found in transportation, centring ability or most 3D parameters (ΔCA, ΔCV and ΔSMI), the TRN group exhibited a significantly higher % Un‐PrepCA. Conversely, the WOG group achieved a significantly greater % ΔCA compared to TRN and PTN. All systems performed comparably without procedural errors; TRN resulted in the least canal wall contact, while WOG provided the largest prepared canal area.

This study aimed to investigate the age-related alterations in mesial roots of mandibular first molar in terms of root canal curvature values, dentin thickness, interorifice distance, deviation from apical foramen, and location of apical foramen using a three-dimensional curvature measurement method and micro-computed tomography (micro-CT). Forty-five mesial roots of mandibular first molars from three age groups (Group 1: ≤ 30 years, Group 2: 31–59 years, Group 3: ≥ 60 years) were scanned using micro-CT. The central axis of each mesiobuccal and mesiolingual canal was analyzed using cubic B-spline curves to calculate canal curvature. Dentin thickness, deviation of apical foramen from the anatomical apex, and the location of apical foramen in mesiobuccal and mesiolingual canals were measured and recorded. Statistical analyses, including one-way ANOVA, Mann–Whitney U, Kruskal–Wallis and Pearson’s correlation tests, were performed to assess age-related differences in curvature, interorifice distance, and dentin thickness with a 5% significance threshold. No statistically significant differences in root canal curvature were observed across the three age groups (p > .05), although a slight increase in curvature was noted in Group 3. Interorifice distance was significantly lower in Group 2 (p < .05), but no significant relationship was found between mesiobuccal curvature and interorifice distance. Dentin thickness, however, showed significant variations: Groups 1 and 2 exhibited thinner mesial dentin (2–6 mm levels), while Group 3 demonstrated greater distal dentin thickness (5–8 mm levels) (p < .05). Apical foramen location and deviation remained consistent across age groups (p > .05), predominantly situated centrally on the root surface. While root canal curvature did not vary significantly with age (p > .05), dentin thickness showed notable age-related differences (p < .05). A significant correlation was observed between the mesiolingual canal curvature and interorifice distance, but no such correlation was found for the mesiobuccal canal. A significant age-related increase in dentin thickness in both the mesiobuccal and mesiolingual canals underscores the impact of secondary dentin deposition, which is probably uniform as the root canal curvature seems to remain relatively stable across the lifespan in mandibular first molars.

Amaç: Bu çalışmanın amacı WaveOne Gold, Reciproc Blue ve North Profa RC Blue nikel titanyum (NiTi) tek eğe döner sistemlerin vücut sıcaklığında döngüsel yorgunluğa bağlı kırılma dirençlerinin karşılaştırılmasıdır. Gereç ve Yöntemler: Bu çalışmada WaveOne Gold, Reciproc Blue ve North Profa RC Blue döner eğe sistemlerinin her birinden on ikişer adet kullanıldı. Tüm eğeler statik model döngüsel yorgunluk deney düzeneğinde, 60°’lik kurvatür açısına, 5 mm kurvatür yarıçapına ve 1,4 mm kanal iç çapına sahip seramik yapay kanallarda ve 37°C’de kırılıncaya kadar kullanıldı. Eğelerin kırılma zamanı dijital kronometre ile kaydedildi ve kırılıncaya kadarki tur sayıları hesaplandı. Normal dağılım göstermediği saptanan veriler Kruskal-Wallis H testi ile analiz edildi. Tahmini sağlam kalma oranının belirlenmesi için Weibull analizi yapıldı. Bulgular: North Profa RC Blue grubu ile Reciproc Blue grubu arasında ve Reciproc Blue grubu ile WaveOne Gold grubu arasında döngüsel yorgunluk direnci bakımından istatistiksel olarak anlamlı bir fark görülmedi (p> 0.05). North Profa RC Blue eğelerin döngüsel yorgunluk direnci WaveOne Gold eğelerden istatistiksel olarak anlamlı derecede yüksek bulundu (p

Aim: This study aimed to evaluate root canal morphology of Vertucci type I root canal configuration detected in mesial roots of mandibular first molar teeth using micro-computed tomography (Micro-CT). Methodology: Micro-CT datasets of 269 specimens were evaluated for the detection of specimens with Vertucci type I root canal configuration for further analysis. Major and minor diameter, area, perimeter and roundness of root canal cross-sections at the beginning and midline of each root thirds were measured and recorded. The presence of apical delta, accessory canals, and deviation of major apical foramen from anatomical apex were investigated. Data was analyzed using descriptive analysis, ANOVA-Tukey and Kruskal-Wallis H-Wilcoxon signed-rank tests. Results: Vertucci type I canal configuration was present in the 4.46% of the specimens. The specimens often showed accessory root canals (50%) and apical deltas (41,6%). From the visual analysis of the 3D and 2D images, significant differences were detected among coronal, middle and apical thirds of the specimens regarding major and minor diameter, area, perimeter and roundness (P < 0.05). Conclusion: Three- and two-dimensional analyses of mesial roots with Vertucci type I canal configuration indicated that this type of configuration presents large buccolingual diameters with long oval shape and has isthmus at coronal and middle thirds. At the apical third the root canals often terminate in an oval cross sectional shape. How to cite this article: Keles A, Keskin C. Quantitative analysis of the anatomy of mesial roots of mandibular first molars with Vertucci type I root canal configuration by means of micro-computed tomography. Int Dent Res 2020;10(1):17-21. https://doi.org/10.5577/intdentres.2020.vol10.no1.4 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

The present study aimed to evaluate the effect of sodium perborate on the compressive strength of calcium silicate‐based materials. ProRoot wMTA, MTA Plus, NeoMTA Plus and Biodentine discs with 5 mm thickness and 4 mm diameter were prepared. Thirty discs from each material were used for compressive strength testing and divided into two groups: control and bleaching (n = 15). The sodium perborate was mixed with 30% hydrogen peroxide in a creamy consistency and placed on the surface of the specimens. Specimens were tested in an Instron machine, and compressive strength values were recorded and compared. The data were analysed using one‐way anova and post hoc Tukey tests. Compressive strength of all tested materials significantly decreased after bleaching (P < 0.05). SEM examination revealed deterioration on materials’ surfaces after bleaching. Application of sodium perborate and hydrogen peroxide reduced the compressive strength of ProRoot wMTA, MTA Plus, NeoMTA Plus and Biodentine.

Uzun İH, et al. J Adv Prosthodont. 2016 Apr;8(2):101-109. https://doi.org/10.4047/jap.2016.8.2.101

Aim: To assess the percentage volumes of filling materials and voids in oval‐shaped canals filled with either cold lateral compaction or warm compaction techniques, using micro‐computed tomography (micro‐CT).Methodology: Twenty‐four single‐rooted maxillary premolar teeth with oval‐shaped canals were selected and the root canals prepared and assigned to two groups (n = 12), according to the filling technique: cold lateral compaction (CLC) or warm vertical compaction (WVC). Each specimen was scanned using a micro‐CT device at an isotropic resolution of 12.5 μm. Percentage volumes of root filling materials and voids were calculated, and data were statistically analysed using Student's t‐test and Friedman's test, with a significance level of 5%.Results: Overall, mean percentage volumes of gutta‐percha, sealer and voids were 82.33 ± 3.14, 13.42 ± 2.91 and 4.26 ± 0.74 in the CLC group and 91.73 ± 4.48, 7.70 ± 4.44 and 0.57 ± 0.44 in the WVC group, respectively, with a statistically significant difference between groups (P < 0.05). At the apical level, differences in the percentage volumes of filling materials and voids between groups were not significant (P > 0.05).Conclusions: No root fillings were void free. Warm vertical compaction produced a significantly greater volume of gutta‐percha and a significantly lower percentage of voids than those achieved with cold lateral compaction. Distribution of sealer and voids within the root canal space after root filling was unpredictable, irrespective of the technique used.

Objectives: The aim of this study was to evaluate the sealing abilities of three different gutta-percha techniques in experimentally defective roots (EDR) and non-defective roots (NR). Materials and Methods: Sixty canine teeth were divided into six groups of ten; Group 1, NR + cold lateral condensation (CLC); Group 2, EDR + LC; Group 3, NR + BeeFill; Group 4, EDR + BeeFill; Group 5, NR + Thermafil; and Group 6, EDR + Thermafil. Apical leakage was measured using a computerized fluid filtration meter with a laser system. Results : Statistical analysis revealed that the CLC demonstrated more microleakage in the EDR than in the NR (P < 0.01). Thermafil demonstrated more microleakage in the NR than in the EDR (P < 0.01). No statistically significant differences were found between the BeeFill groups (P > 0.05). Conclusions: The results of this study indicate that internal resorptive cavities can affect the apical sealing properties of different root canal filling techniques, with Thermafil ensuring the lowest apical microleakage.