Yazar "Yigit-Ozer, Senem" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • [ X ]
    Öğe
    Deformation of the self-adjusting file on simulated curved root canals: a time-dependent study
    (Mosby-Elsevier, 2011) Akcay, Ilgin; Yigit-Ozer, Senem; Adiguzel, Ozkan; Kaya, Sadulah
    Objective. This study examined the surface changes of self-adjusting file after operating in different degrees of canal curvatures with a fixed radius of curvature in different operation intervals. Study design. Artificial canals were manufactured in a 5-mm radius of curvature with 45 degrees and 60 degrees angles of curvature. Forty self-adjusting files were divided into 2 groups and submitted to functional fatigue to failure. Twenty files were tested using the 45 degrees angle and the remaining 20 were tested using the 60 degrees angle at 4 minutes for 7 periods in a total of 28 minutes. The average time frame for each 4-minute inspection period was considered as the moment of failure at 2, 6, 10, 14, 18, 22, and 26 minutes, respectively. Instruments were evaluated using scanning electron microscopy to characterize the material under study. Results. The lattice detachment began at the second period for both groups and continued to increase along with the ongoing testing time. The detachment that occurred in 60 canal curvature was higher at the third and fourth periods when compared with the 45 degrees group (P < .05). For both groups, during the third period, detachment of the arch of the lattice was only one sided; however, this deformation was severe between the fourth and sixth periods with a 2-sided detachment, which was easier to separate. The rough surface became smooth after usage. No full separation of the file was evident for both groups. Conclusions. In multirooted teeth with severely curved root canals, using more than one self-adjusting file might be recommended to prevent lattice detachment. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011; 112: e12-e17)
  • [ X ]
    Öğe
    Effectiveness of ethylenediaminetetraacetic acid (EDTA) and MTAD on debris and smear layer removal using a self-adjusting file
    (Mosby-Elsevier, 2011) Adiguzel, Ozkan; Yigit-Ozer, Senem; Kaya, Sadullah; Uysal, Ibrahim; Ganidagli-Ayaz, Selengul; Akkus, Zeki
    Objective. The aim of this study was to investigate the cleaning ability of a self-adjusting file (SAF) system regarding debris and smear layer removal using ethylenediaminetetraacetic acid (EDTA) or MTAD. Study design. In total, 45 maxillary incisor teeth were randomly divided into 2 different irrigation groups of 20 canals each and a negative control group of 5 canals. The canals in each of the irrigation groups were irrigated using sodium hypochlorite (1.3%) as an initial irrigant during the first 2 minutes of operation, followed by 2 minutes continuous irrigation with either 17% EDTA or MTAD in a closed system. The negative control group was irrigated using 1.3% sodium hypochlorite. The roots were split longitudinally and subjected to scanning electron microscopy (SEM). The presence of debris and smear layer in the coronal, middle, and apical thirds of the canal was evaluated using a 5-grade scoring system with x200 and x2,000 magnification, respectively. Results. The SAF operation with 2-minute continuous irrigation using MTAD resulted in root canal walls that were free of smear layer in 85%, 70%, and 60% and of debris in 95%, 90%, and 95% of the coronal, middle, and apical thirds of the root canals, respectively. The SAF operation with continuous irrigation using EDTA resulted in root canal walls that were free of smear layer in 85%, 60%, and 50% and of debris in 95%, 90%, and 85% of the coronal, middle, and apical thirds of the root canals, respectively. Teeth in the negative control group were totally covered with debris. Evaluation by SEM showed no significant difference between the tested irrigants in removing the smear layer and debris among the different regions of the root canal. Both groups were significantly different from the negative control group. Conclusions. When using the SAF, the protocols used in this study were effective for debridement for all regions of the root canal even for the apical thirds. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;112:803-808)
  • [ X ]
    Öğe
    Evaluation of radicular dentin erosion and smear layer removal capacity of Self-Adjusting File using different concentrations of sodium hypochlorite as an initial irrigant
    (Mosby-Elsevier, 2011) Kaya, Sadullah; Yigit-Ozer, Senem; Adiguzel, Ozkan
    Objective. The aim of this study was to evaluate Self-Adjusting File (SAF) in the removal of smear layer and impact on the dentin surface using sodium hypochlorite (NaOCl) as an initial irrigation solution at 3 different concentrations combined with 1% EDTA. In addition, the erosive effect of this dual irrigation regime was examined. Study design. Root canal preparations were performed in 30 teeth using the SAF with a continuous irrigation device (Vatea) in a closed system in which the apical foramen was sealed. The vibration mode was on for 5 minutes during the preparation. Three different concentrations of NaOCl (1.3%, 2.6%, and 5.25%) and 1% EDTA were used for continuous irrigation. The final flush was also performed using NaOCl with the vibration mode on. The roots were split longitudinally and subjected to scanning electron microscopy (SEM). The presence of the smear layer was scored using a 5-point scoring system, and the erosive capacity of the irrigants were scored using a 3-point scoring system. Results. The results showed no significant difference in smear layer removal among different concentrations of NaOCl and among the regions. Clean dentin surfaces were observed in 80%, 70%, and 70% with a score of 1 or 2 of the apical thirds using 1.3%, 2.6%, and 5.25% NaOCl, respectively. The 1.3% and 2.6% NaOCl solutions showed similar erosion patterns on the root canal walls (P > .05); however, 5.25% NaOCl caused severe erosion (P < .05). Conclusions. When using the SAF with continuous irrigation and vibration, lower concentrations of NaOCl and EDTA can be recommended for efficient clinical removal of the smear layer even in the apical thirds and to avoid excessive erosion of root dentin. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;112:524-530)
  • [ X ]
    Öğe
    Patient-specific factors in the proximity of the inferior alveolar nerve to the tooth apex
    (Medicina Oral S L, 2012) Adiguzel, Ozkan; Yigit-Ozer, Senem; Kaya, Sadullah; Akkus, Zeki
    Objectives: To evaluate whether age and gender differences are predictive factors for inferior alveolar nerve position with respect to mandibular first molar roots. Study Design: Cone-beam computed tomography scans [0.2-mm(3) voxel size; n = 200 (100 males, 100 females)] of patients aged 15-65 years showing mandibular first and second molars were included in this study. Patients with pathoses that might affect inferior alveolar nerve position, including second molar and/or first premolar extraction, were excluded. Fourteen measurements (mm) were taken from the inferior alveolar nerve to the mesial and distal root apices. Subjects were grouped by age and gender. Data were analysed using two-way analyses of variance with post hoc Bonferroni corrections. Results: The distance from the inferior alveolar nerve to the root apices was smaller in females than males, regardless of age (p < 0.01). Distal roots were closer to the nerve than mesial roots in both genders (p < 0.05). Total buccolingual mandibular length (at 3-mm apical level) was shorter in females than males (p < 0.01) but mean buccolingual mandibular width at the level of the inferior alveolar canal did not differ. Nerve-root apex distances were significantly shorter in males and females aged 16-25 and 56-65 years than in other age groups (p < 0.01). Conclusions: The distance between inferior alveolar nerve and mandibular first molar roots depends upon the age and gender: it is shorter in females than in males and in subjects aged 16-25 years and >55 years than in other age groups.
  • [ X ]
    Öğe
    Self-Adjusting Files in Retreatment: A High-resolution Micro-Computed Tomography Study
    (Elsevier Science Inc, 2012) Solomonov, Michael; Paque, Frank; Kaya, Sadullah; Adzguzel, Ozkan; Kfir, Anda; Yigit-Ozer, Senem
    Introduction: Rotary instruments that are used for retreatment are very effective, but most of them leave root filling residue in the canal. The aim of this study was to evaluate the efficacy of removing gutta-percha based root fillings with Pro Taper retreatment files (Dentsply Maillefer, Ballaigues, Switzerland) followed by F1 and F2 Pro Taper instruments and to compare these results with those obtained with a #25.06 Pro File instrument (Dentsply Maillefer) followed by the Self-Adjusting File (SAF; Re Dent, Ra'anana, Israel) using high resolution micro-computed tomography (CT) scanning. Methods: Twenty-eight mandibular molar teeth with oval distal root canals were divided into 2 equal groups of 14 teeth each. The distal root canals were instrumented with Pro Taper files up to an F2 instrument, the roots were subsequently filled, and the root filling was allowed to set fully. Removal of the root canal filling was performed with D1-D3 ProTaper retreatment files followed by F1 and F2 ProTaper instruments or with a #25.06 Profile followed by SAFs. Chloroform was used in both groups to assist in the removal of the root filling material. High-resolution micro-CT scans were used to measure the residual quantities of the root filling material after completion of the procedures. Statistical analysis was performed using the Wilcoxon test and the Student t test. Results: The median root filling residue in the ProTaper group was 5.39% (inter-quartile range [IQR] = 4.71) of the original volume of the root canal filling. In the ProFile and SAF group, the median residue was 0.41% (IQR = 1.64, P < .001). An arbitrarily selected threshold of less than 0.5% residue was defined as effectively cleaned, and 57% of the teeth treated with the ProFile and the SAF met this threshold, whereas none of the cases in the ProTaper group did. The ProFile and SAF procedure required less time than the ProTaper protocol. Conclusions: None of the retreatment methods rendered all of the canals completely free of all root filling residue. Under the conditions of this study, the ProFile and SAF procedure was more effective than the ProTaper procedure and left significantly less root filling residue in the root canal. (J Ended 2012;38:1283-1287)