Person: ERŞAHAN EROĞLU, ŞEYDA
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Publication Metadata only Changes in human pulp blood flow during canine retraction(2016-01-01T00:00:00Z) Sabuncuoglu, Fidan Alakus; Ersahan, Seyda; ERŞAHAN EROĞLU, ŞEYDAAim: To evaluate the effects of maxillary canine retraction on pulpal blood flow (PBF) in humans as recorded by laser Doppler flowmetry (LDF).Methods: Maxillary canines of 24 participants were divided into two groups (n=12 each). Teeth in the study group underwent maxillary canine retraction using mini-implants as anchorage for approximately 4 months, with 100g of force applied via coil springs. Subjects in the control group received no orthodontic treatment. LDF measurements were recorded at baseline (T0); during retraction, at 24hours (T1), 3 days (T2), 7 days (T3) and 1 month (T4); and at the end of retraction (T5) in the study group and at similar time-points in control subjects. Data were analyzed using the Friedman, Wilcoxon signed rank and Mann-Whitney U tests, with the significance level set at 0.05.Results: No significant changes in PBF perfusion units (PU) were observed in the control group over the course of the study. However, PBF in the study group increased significantly from T0 (3.60.2 PU) to T1 (3.7 +/- 0.2 PU, p<0.001) and decreased severely from T1 to T2 (3.3 +/- 0.1, p<0.001). PBF in the study group was still significantly lower at T3 (3.4 +/- 0.1 PU, p<0.001) in comparison to T0; however, at T4 and T5, PBF was found to have returned to pre-retraction levels.Conclusion: The fact that PBF values returned to initial levels within one month of the initiation of retraction despite short-term, hyperaemic, regressive changes demonstrates that the changes observed in PBF during canine retraction are reversible.Publication Metadata only Solubility and apical sealing characteristics of a new calcium silicate-based root canal sealer in comparison to calcium hydroxide-, methacrylate resin- and epoxy resin-based sealers(2013-05-01T00:00:00Z) Ersahan, Seyda; AYDIN, Cumhur; ERŞAHAN EROĞLU, ŞEYDAAim. To assess and compare the water sorption, solubility and apical sealing ability of iRoot SP and three other widely used root canal sealers. Materials and methods. Solubility was assessed by immersing standardized samples of calcium silicate( iRoot SP), calcium hydroxide-(Sealapex), methacrylate resin- (EndoREZ) and epoxy resin-(AH Plus) based sealers in distilled water and measuring weight gain and weight loss at 6 h, 24 h and daily for 14 days. Roots of extracted mandibular premolars (n = 80) were prepared with 0.04-taper nickel-titanium rotary files to a final size 40. Roots were then randomly divided into four experimental groups (n = 18) and two control groups (n = 4), root canal sealers were applied and apical leakage was assessed using the fluid filtration method. Data was analyzed using Kruskal Wallis analysis of variance and Mann-Whitney U-tests, with the level of significance set at p <= 0.05. Results. EndoREZ exhibited the highest water sorption, followed by iRoot SP, Sealapex and AH Plus. Sealapex exhibited significantly higher solubility than the other sealers, whereas no significant differences in solubility levels were observed between the other three sealers tested. AH Plus exhibited significantly lower microleakage than Sealapex and EndoREZ, whereas no difference in microleakage was found between AH Plus and iRoot SP. Conclusions. In view of the study findings, all tested sealers except Sealapex met the ANSI/ADA-s requirements for solubility and no difference was found between AH Plus and iRoot SP in terms of apical sealing ability.Publication Metadata only Changes in maxillary incisor dental pulp blood flow during intrusion by mini-implants(2014-10-01T00:00:00Z) SABUNCUOGLU, Fidan Alakus; Ersahan, Seyda; ERŞAHAN EROĞLU, ŞEYDAAim. The aim of this clinical study was to identify changes in pulpal blood flow (PBF) in human central incisors resulting from short-and long-term intrusive orthodontic forces from mini-implants. Materials and methods. A total of 40 sound upper central and lateral incisors in 20 patients scheduled for intrusion for orthodontic reasons were divided into two groups. From each group, 20 teeth were subjected to intrusive force from mini-implants (Group 1 = Light Force: 40 g; Group 2 = Heavy Force: 120 g), whereas the remaining 20 contralateral teeth were not subjected to forces from mini-implants and served as controls. Laser-Doppler flowmetry (LDF) measurements were recorded at baseline and at 3 days and 3 weeks following intrusion. Results. PBF decreased significantly at 3 days (Light Force Group: 7.72 +/- 0.50; Heavy Force Group: 7.72 +/- 0.52) and then increased towards baseline at 3 weeks (Light Force Group: 10.37 +/- 0.58; Heavy Force Group: 10.31 +/- 0.45) following intrusion. Conclusions. In other words, despite slight regressive changes in pulpal tissue in the short-term, PBF improved after 3 weeks following intrusion by mini-implants, indicating that the changes observed in PBF is reversible, even following radical incisor intrusion.Publication Metadata only Dislocation Resistance of iRoot SP, a Calcium Silicate-based Sealer, from Radicular Dentine(2010-12-01T00:00:00Z) Ersahan, Seyda; AYDIN, Cumhur; ERŞAHAN EROĞLU, ŞEYDAIntroduction: The aim of this study was to evaluate the push-out bond strength of iRoot SP (Innovative Bioceramix, Vancouver, Canada) and compare it with that of other widely used root canal sealers. Methods: Sixty extracted human maxillary canines were sectioned transversally below the cement-enamel junction to obtain 120 4-mm-thick dentin disks that were randomly divided into four groups (n = 30) for treatment with one of four different root-canal sealers (iRoot SP, AH Plus [Dentsply DeTrey GmbH, Konstanz, Germany], Sealapex [SybronEndo Corporation, Orange, CA], EndoREZ [Ultradent Inc, South Jordan, UT]). Standardized cavities were prepared to simulate root canals, cavities were filled with sealer material, and push-out bond-strength testing was performed using a universal testing machine. Failure modes were assessed quantitatively under a stereomicroscope and morphologically under a scanning electron microscope. Statistical analysis was performed using one-way analysis of variance and the post hoc Tukey test, with the significance level set at 0.05. Results: Bond strengths of iRoot SP and AH Plus were significantly higher than those of Sealapex and EndoREZ. There was no significant difference between the bond strength of iRoot SP and AH Plus (p = 0.274). Conclusions: iRoot SP and AN Plus performed similarly and better than EndoREZ and Sealapex in terms of bond strength. (J Endod 2010;36:2000 -2002)Publication Metadata only Effects of magnitude of intrusive force on pulpal blood flow in maxillary molars(2015-07-01T00:00:00Z) Ersahan, Seyda; SABUNCUOGLU, Fidan A.; ERŞAHAN EROĞLU, ŞEYDAIntroduction: In this study, we aimed to evaluate and compare blood-flow changes in the pulp tissues of maxillary molars over a 6-month period after orthodontic intrusion using different magnitudes of force. Methods: Twenty patients were randomly divided into 2 groups (n = 10) according to the amount of intrusive force applied. An intrusive force of either 125 g (light) or 250 g (heavy) was applied to the overerupted maxillary first molars using mini-implants; no force was applied to the contralateral molars. Laser Doppler flowmetry was used to measure pulpal blood flow (PBF) at baseline and during intrusion at 24 hours, 3 days, 7 days, 3 weeks, 4 weeks, 3 months, and 6 months. The data were analyzed with the Mann-Whitney U and Wilcoxon signed rank tests, with P <0.05 considered statistically significant. Results: PBF decreased significantly at 3 days and continued to remain suppressed until 3 weeks, after which a gradual trend of recovery was observed until 3 months, when the levels returned to near those measured before intrusion. When the data were analyzed with regard to the amount of applied force, significant differences were observed between the 2 groups only at 3 and 7 days. Conclusions: These findings demonstrate that despite slight regressive changes in pulpal tissue over the short term, PBF values tend to return to their initial levels within 3 months, indicating that changes observed in PBF are reversible, even during radical intrusions of molars with 125 and 250 g of forces.Publication Metadata only Comparative evaluation of pulpal blood flow during incisor intrusion(2015-11-01T00:00:00Z) SABUNCUOGLU, Fidan Alakus; Ersahan, Seyda; ERŞAHAN EROĞLU, ŞEYDAAim: The aim of the present study was to evaluate and compare changes in pulpal blood flow (PBF) as a result of maxillary incisor intrusion achieved by one of two methods (utility arches or mini-implants).