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    Color stability of a novel self-cure bulk-fill composite compared to light-cure bulk-fill and injectable composite resins
    (Bmc, 2025) Carikcioglu, Burak; Ay Simsek, Idil; Arikan, Volkan; Sariyilmaz, Evren
    ObjectiveThis study aimed to assess the color stability of a novel self-cure bulk-fill composite (automix and capsule forms), in comparison to a light-cure bulk-fill composite and a conventional flowable composite after immersion in common beverages. Materials and methodsFour composite resins (Stela Automix, Stela Capsule, Filtek Bulk Fill Flowable, and G-ae nial Universal Injectable) were evaluated on 160 disc-shaped specimens. Specimens were randomly assigned to four subgroups (n = 10) and immersed in tea, coffee, cola, or distilled water (control). Color measurements were performed using a spectrophotometer at baseline, 6 and 12 days, and color changes (Delta E-0(0)) were calculated using the CIEDE2000 formula. Statistical analyses were performed using one-way ANOVA with Tukey's post-hoc tests and paired sample T-tests to evaluate time-dependent changes (p < 0.05). ResultsAll composites showed increased discoloration over time, with coffee causing the most significant color change, followed by cola, while tea had a milder effect. Self-cure bulk-fill composites showed significantly higher Delta E-0(0) values than their light-cure composites. Stela Automix showed the greatest color change after Stela Capsule. ConclusionThe results suggest that self-cure bulk-fill composites have lower color stability than light-cure composites. Filler characteristics, particularly particle size and loading, have a greater influence on color stability than resin matrix composition.
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    Effects of solvents on the adhesion of glass fiber posts to root canal dentin: An in vitro study
    (Turkish Endodontic Society, 2025) Sariyilmaz, Evren; Çelik, Ersan; Cakici, Elif Bahar; Çakici, Fatih; Sariyilmaz, Öznur; Ömür Dede, Doğu Ömür; Tulga, Ayça
    Purpose: This study compared the effects of solvents (chloroform, orange oil, turpentine, eucalyptol, Endosolv R) and irrigants (5.25% sodium hypochlorite [NaOCl], distilled water) on the adhesion of glass fiber posts luted with dual-cure resin cement to root canal dentin, testing the hypothesis that solvents and NaOCl would impair bond strength. Methods: In this in vitro study, 128 extracted human mandibular premolars were prepared, filled, and retreated using NiTi files with assigned solvents/irrigants. Post spaces were prepared, and glass fiber posts were cemented with dual-cure resin. Push-out bond strength (MPa) was measured on 1-mm-thick root slices using a universal testing machine. Data were analyzed via ANOVA and Tukey tests (p<0.05). Results: Turpentine significantly reduced bond strength compared to control and other solvents (p<0.05). NaOCl also decreased bond strength (p<0.05), while Endosolv R, chloroform, eucalyptol, and orange oil showed values comparable to the control. The highest bond strength was observed with eucalyptol. Conclusion: Turpentine and NaOCl adversely affected glass fiber post adhesion, likely due to solvent penetration or oxygen radical interference. Clinicians should avoid turpentine during retreatment and consider antioxidants with NaOCl. Further research on solvent-dentin interactions is warranted to optimize post-retreatment outcomes. © 2025, Turkish Endodontic Society. All rights reserved.
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    Impact of Biodentine Placement on Fracture Resistance and its Influence on Discoloration with Different Scaffolds
    (Elsevier Science Inc, 2025) Sariyilmaz, Evren; Sariyilmaz, Oznur; Carikcioglu, Burak; Uslu, Gulsah; Alan, Raif
    Introduction: This study aimed to investigate the fracture resistance of teeth that underwent ex vivo regenerative endodontic treatment using Biodentine placed either above or below the cemento-enamel junction (CEJ). Additionally, it examined the impact of different placement approaches, in combination with various scaffold materials (blood, platelet-rich fibrin [PRF], injectable PRF [i-PRF]), on tooth discoloration over time. Methods: Thirty-nine human maxillary incisors were divided into three groups. The control group consisted of intact teeth. In the two experimental groups, regenerative endodontic procedures were simulated, and Biodentine was placed above or below the CEJ. Fracture resistance was evaluated after thermal and mechanical aging using a chewing simulator. In the discoloration test, 96 human maxillary incisor teeth were selected. Roots were sectioned 10 mm apical to the CEJ and canal enlargement was performed Gates-Glidden burs. Teeth were grouped according to the placement level of Biodentine (above or below CEJ) and the type of scaffold materials used (blood, PRF, i-PRF, distilled water). Discoloration was assessed by using a spectrophotometer at baseline, 1 week, 1 month, and 6 months. Data were analyzed using one-way analysis of variance followed by Tukey post hoc tests independent t-tests were used to evaluate the effect of placement location on color change. Results: The fracture resistance of intact teeth was significantly higher than that of the group in which Biodentine was placed below the CEJ. Blood and blood-derived products resulted in greater discoloration compared to distilled water, whereas PRF induced less discoloration than blood. Furthermore, the placement of Biodentine above the CEJ led to significantly less discoloration at specific time points compared to its placement below the CEJ. Conclusions: Positioning Biodentine above the CEJ may offer clinical advantages by potentially improving structural integrity while minimizing aesthetic concerns. When PRF is used as the scaffold material and Biodentine is placed coronally, tooth discoloration is minimized. (J Endod 2025;51:1199-1206.)
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    Micro-CT evaluation of MTA compaction techniques in 3D-printed teeth with simulated perforating internal root resorption: an in vitro study
    (Bmc, 2025) Sariyilmaz, Oznur; Sariyilmaz, Evren; Uslu, Gulsah; Keskin, Cangul; Keles, Ali
    Background This study aimed to compare the effectiveness of manual compaction, indirect ultrasonic activation, and a novel sonic-activated endomotor in reducing voids during MTA placement in perforated internal root resorption cavities (IRR). Methods Thirty standardized 3D-printed resin teeth with simulated perforating IRR cavities (4 mm in diameter, located 4 mm from the apex, with a 2 mm buccal perforation) were fabricated. The samples were randomly divided into 3 groups: Manual compaction: MTA was placed and compacted using hand pluggers. Ultrasonic activation: MTA was placed and indirectly activated with an ultrasonic device at 30% power for 3 cycles of 10 s each. Sonic-activated endomotor: MTA was placed and compacted using the 812 MT endomotor. Specimens were stored at 37 degrees C in 100% humidity for 1-week. Micro-computed tomography (micro-CT) was used to evaluate the void volume. Intergroup comparisons were conducted using the Kruskal-Wallis test at a 5% significance level. Results The mean void volumes were 6.49 mm(3) in the manual compaction group, 2.61 mm(3) in the ultrasonic activation group, and 3.89 mm(3) in sonic-activated endomotor group. Although the manual compaction group exhibited the highest void volume, the differences among the groups were not statistically significant (P > 0.05). Conclusions Within the limitations of this in vitro study, all three MTA compaction techniques demonstrated comparable outcomes in the compaction of MTA in perforating IRR cavities. These findings suggest that, in such cases, the choice of technique may be guided by operator preference and clinical circumstances rather than expected differences in void reduction.