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Öğe 3D Analysis of D-RaCe and Self-Adjusting File in Removing Filling Materials from Curved Root Canals Instrumented and Filled with Different Techniques(Hindawi Publishing Corp, 2014) Simsek, Neslihan; Ahmetoglu, Fuat; Keles, Ali; Bulut, Elcin Tekin; Er, KursatThe aim of this study was to compare the efficacy of D-RaCe files and a self-adjusting file (SAF) system in removing filling material from curved root canals instrumented and filled with different techniques by using microcomputed tomography (micro-CT). The mesial roots of 20 extracted mandibular first molars were used. Root canals (mesiobuccal and mesiolingual) were instrumented with SAF or Revo-S. The canals were then filled with gutta-percha and AH Plus sealer using cold lateral compaction or thermoplasticized injectable techniques. The root fillings were first removed with D-RaCe (Step 1), followed by Step 2, in which a SAF system was used to remove the residual fillings in all groups. Micro-CT scans were used to measure the volume of residual filling after root canal filling, reinstrumentation with D-RaCe (Step 1), and reinstrumentation with SAF (Step 2). Data were analyzed using Wilcoxon and Kruskal-Wallis tests. There were no statistically significant differences between filling techniques in the canals instrumented with SAF (P = 0.292) and Revo-S (P = 0.306). The amount of remaining filling material was similar in all groups (P = 0.363); all of the instrumentation techniques left filling residue inside the canals. However, the additional use of SAF was more effective than using D-RaCe alone.Öğe 3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals(Aves Press Ltd, 2017) Simsek, Neslihan; Keles, Ali; Ahmetoglu, Fuat; Akinci, Levent; Er, KursatObjective: This study used microcomputed tomography (micro-CT) to compare the volumes of voids and gaps in curved root canals instrumented and filled using various techniques. Methods: Twenty extracted mandibular first molars with two curved mesial root canals were used. Root canals were instrumented using a self-adjusting file (SAF) or Revo-S file system. For standardization, mesiobuccal canals were instrumented with SAF and mesiolingual canals were instrumented with Revo-S in each root. The canals were divided into four experimental groups (n=10 in each). The canals were then filled via cold lateral compaction (CLC) or a thermoplasticized injectable technique (TT) using gutta-percha and AH Plus root canal sealer. The roots were scanned with a micro-CT, and the volumes of the voids and gaps were calculated using three-dimensional (3D) micro-CT images. Data were analyzed using unpaired t- and Kruskal-Wallis tests. A value of P < 0.05 was considered significant. Results: None of the tested techniques provided void-or gap-free fillings. Nevertheless, the SAF showed more gap formation than the Revo-S, and TT showed higher gap formation in all experimental groups. These differences, however, were not statistically significant (p>0.05). Conclusion: The SAF and Revo-S rotary file systems yielded comparable results. No statistically significant difference was found between the results of the various instrumentation and filling techniques.Öğe 3D micro-CT analysis of void formations and push-out bonding strength of resin cements used for fiber post cementation(Korean Acad Prosthodontics, 2016) Uzun, Ismail Hakki; Malkoc, Meral Arslan; Keles, Ali; Ogreten, Ayse TubaPURPOSE. To investigate the void parameters within the resin cements used for fiber post cementation by micro-CT (mu CT) and regional push-out bonding strength. MATERIALS AND METHODS. Twenty-one, single and round shaped roots were enlarged with a low-speed drill following by endodontic treatment. The roots were divided into three groups (n=7) and fiber posts were cemented with Maxcem Elite, Multilink N and Superbond C&B resin cements. Specimens were scanned using mu CT scanner at resolution of 13.7 mu m. The number, area, and volume of voids between dentin and post were evaluated. A method of analysis based on the post segmentation was used, and coronal, middle and apical thirds considered separately. After the mu CT analysis, roots were embedded in epoxy resin and sectioned into 2 mm thick slices (63 sections in total). Push-out testing was performed with universal testing device at 0.5 mm/min cross-head speed. Data were analyzed with Kruskal-Wallis and Mann-Whitney U tests (alpha=.05). RESULTS. Overall, significant differences between the resin cements and the post level were observed in the void number, area, and volume (P<.05). Super-Bond C&B showed the most void formation (44.86 +/- 22.71). Multilink N showed the least void surface (3.51 +/- 2.24 mm(2)) and volume (0.01 +/- 0.01 mm(3)). Regional push-out bond strength of the cements was not different (P>.05). CONCLUSION. mu CT proved to be a powerful non-destructive 3D analysis tool for visualizing the void parameters. Multilink N had the lowest void parameters. When efficiency of all cements was evaluated, direct relationship between the post region and push out bonding strength was not observed.Öğe Autogenous Tooth Bone Graft and Simvastatin Combination Effect on Bone Healing(Lippincott Williams & Wilkins, 2020) Tasdemir, Ufuk; Kirtay, Mustafa; Keles, Ali; Cil, Nazli; Abban, Gulcin; Dodurga, YavuzObjective: Autogenous tooth bone grafts (ATGM) are materials prepared from extracted teeth and have been used for bone augmentation. These graft materials are known to have similar structures and components to bone grafts. In this sense, this study aimed to evaluate all the tooth layers mixed with simvastatin without any demineralization process effect on bone formation. Methods: In 60 Wistar albino rats, a standardized 6.0 m-diameter critical size bone defect was created in their calvarium. The study consists of 1 control and 4 experimental groups. In the control group (12 rats), the defects were left empty. The defects were grafted only with ATGM in Group 1, with ATGM mixed with simvastatin in Group 2, autogenous bone graft mixed with simvastatin in Group 3, and with xenogenic bone graft mixed with simvastatin in Group 4. The animals were sacrificed at the 7th and 28th days after operation. Results: PCR, micro CT and histological results show that bone formation was enhanced in the experimental groups in comparison to the control group. Group 1 and Group 2 had similar bone formation rate when compared to Group 3 and Group 4 at the 28th day after operation. Conclusion: This study concludes that mineralized teeth may be used for defect reconstruction without any demineralization process. Autogenous mineralized tooth bone graft should be mixed with simvastatin for bone regeneration like other grafts.Öğe Comparative evaluation of root canal preparations of maxillary first molars with self-adjusting file, reciproc single file, and revo-s rotary file: A micro-computed tomography study(Wiley-Hindawi, 2015) Ahmetoglu, Fuat; Keles, Ali; Simsek, Neslihan; Ocak, M. Sinan; Yologlu, SaimThis study was aimed to use micro-computed tomography (-CT) to evaluate the canal shaping properties of three nickel-titanium instruments, Self-Adjusting File (SAF), Reciproc, and Revo-S rotary file, in maxillary first molars. Thirty maxillary molars were scanned preoperatively by using micro-computed tomography (-CT) scans at 13,68m resolution. The teeth were randomly assigned to three groups (n=10). The root canals were shaped with SAF, Reciproc, and Revo-S, respectively. The shaped root canals were rescanned. Changes in canal volumes and surface areas were compared with preoperative values. The data were analyzed using Kruskal-Wallis and Conover's post hoc tests, with p<.05 denoting a statistically significant difference. Preoperatively canal volumes and surface area were statistically similar among the three groups (p>.05). There were statistically significant differences in all measures comparing preoperative and postoperative canal models (p=0.0001). These differences occurred after instrumentation among the three experimental groups showed no statistically significant difference for volume (p>.05). Surface area showed the similar activity in buccal canals in each of the three techniques whereas no statistically significant difference was detected among surface area, the SAF, and the Revo-S in the palatal (P) canal. Each of three shaping system showed the similar volume activity in all canals, but SAF and Revo-S provided more effectively root planning in comparison with Reciproc in P canal. SCANNING 37:218-225, 2015. (c) 2015 Wiley Periodicals, Inc.Öğe Comparison of different retreatment techniques and root canal sealers: a scanning electron microscopic study(Sociedade Brasileira De Pesquisa Odontologica, 2014) Simsek, Neslihan; Keles, Ali; Ahmetoglu, Fuat; Ocak, Mevlut Sinan; Yologlu, SaimThe aim of this study was to evaluate the effectiveness of two retreatment techniques, in terms of the operating time and scanning electron microscopy (SEM) results, in removing three different root canal sealers from root canals that were previously filled with gutta-percha. Sixty extracted single-rooted human premolars were divided into three groups and filled with iRoot SP, MM Seal, and AH Plus sealers, along with gutta-percha, through a lateral compaction technique. Root canal fillings of the samples were removed by ESI ultrasonic tips or R-Endo files. The time to reach the working length was recorded. Longitudinally sectioned samples were examined under SEM magnification. Each picture was evaluated in terms of the residual debris. Data were statistically analyzed with the Kruskall-Wallis test. No statistically significant differences were found in terms of operating time (p>0.05). Significant differences in the number of debris-free dentinal tubules were found among the root canal thirds, but this finding was not influenced by the experimental group (p<0.05). Resin sealer tags were observed inside the dentinal tubules in the MM Seal group. Under the conditions of this study, it may be established that there was no difference among the sealers and retreatment techniques.Öğe The efficacy of laser, ultrasound and self-adjustable file in removing smear layer debris from oval root canals following retreatment: A scanning electron microscopy study(Wiley, 2016) Keles, Ali; Kamalak, Aliye; Keskin, Cangul; Akcay, Merve; Uzun, IsmailThis study aims to compare the efficacy of different irrigation activation methods to remove smear layer and debris from oval-shaped root canals following retreatment. Ninety mandibular canines with oval-shaped root canals were selected. Retreatment was performed with R-Endo retreatment files. The samples were randomly divided into six groups (n=15). Groups were assigned according to agitation technique: R-Endo with classic irrigation, with self-adjustable file, with passive ultrasonic irrigation, R-Endo+Er:YAG, R-Endo+PIPS and R-Endo+Nd:YAG. Compared with the classic irrigation (R-Endo+CI) group, all other groups were more successful in reducing smear layer and debris (P<0.05). The least amount of residual smear layer and debris was detected in the Er:YAG laser group (P<0.05). Additional use of different agitation methods contributes to removal of debris and smear layer following root canal filling removal with rotary instruments; however, none of the techniques tested render root canal walls completely free of smear layer or debris.Öğe The efficacy of laser, ultrasound and self-adjustable file in removing smear layer debris from oval root canals following retreatment: A scanning electron microscopy study(Wıley, 111 rıver st, hoboken 07030-5774, nj usa, 2016) Keles, Ali; Kamalak, Aliye; Keskin, Cangul; Akcay, Merve; Uzun, IsmailThis study aims to compare the efficacy of different irrigation activation methods to remove smear layer and debris from oval-shaped root canals following retreatment. Ninety mandibular canines with oval-shaped root canals were selected. Retreatment was performed with R-Endo retreatment files. The samples were randomly divided into six groups (n=15). Groups were assigned according to agitation technique: R-Endo with classic irrigation, with self-adjustable file, with passive ultrasonic irrigation, R-Endo+Er:YAG, R-Endo+PIPS and R-Endo+Nd:YAG. Compared with the classic irrigation (R-Endo+CI) group, all other groups were more successful in reducing smear layer and debris (P<0.05). The least amount of residual smear layer and debris was detected in the Er:YAG laser group (P<0.05). Additional use of different agitation methods contributes to removal of debris and smear layer following root canal filling removal with rotary instruments; however, none of the techniques tested render root canal walls completely free of smear layer or debris.Öğe Efficacy of self-adjusting file and passive ultrasonic irrigation on removing calcium hydroxide from root canals(Japanese Soc Dental Materials Devices, 2013) Ahmetoglu, Fuat; Simsek, Neslihan; Keles, Ali; Ocak, Mevlut Sinan; Er, KursatThe aim of this study was to evaluate the efficiencies of the self-adjusting file (SAF) system, passive ultrasonic irrigation (PUT), and conventional irrigation (CI) in removing calcium hydroxide (CH) from root canals. Fifty-one mandibular premolars were used. After root canals were instrumented and filled with a CH paste, 45 teeth were randomly assigned to three experimental groups according to CH removal technique: SAF system, PUI, or CI. The remaining 6 teeth served as positive and negative controls. All samples were evaluated by scanning electron microscopy (SEM) and scored. None of the techniques removed CH completely. However, results at coronal, middle and apical thirds showed that PUT technique was significantly more effective than SAF and CI in removing CH dressing residues from root canal walls.Öğe Evaluation of marginal and internal adaptation of hybrid and nanoceramic systems with microcomputed tomography: An in vitro study(Mosby-Elsevier, 2017) Yildirim, Guler; Uzun, Ismail H.; Keles, AliStatement of problem. The accuracy of recently introduced chairside computer-aided design and computer-aided manufacturing (CAD-CAM) blocks is not well established, and marginal integrity and internal adaptation are not known. Purpose. The purpose of this in vitro study was to evaluate the marginal and internal adaptation of hybrid and nanoceramics using microcomputed tomography (mu-CT). Material and methods. The marginal and internal adaptation of 3 polymer-infiltrated ceramic network (PICN) materials (Vita Enamic EVE]; Lava Ultimate [LU]; Vita Suprinity [VS]) were compared with lithium disilicate (IPS e.max.CAD, IPS). Ninety-six specimens (48 dies and 48 crowns) were prepared (n=12 each group) using a chairside CAD-CAM system. The restorations were scanned with mu-CT, with 160 measurements made for each crown, and used in 2-dimensional (2D) analysis. The marginal adaptation of marginal discrepancy (MD), absolute marginal discrepancy (AMD), internal adaptation of shoulder area (SA), axial space (AS), and occlusal space (OS) were compared using appropriate statistical analysis methods (alpha=.05). Cement volumes were compared using 3D analysis. Results. The IPS blocks showed higher MD (130 mu m), AMD (156 mu m), SA (111 mu m) (P<.05), AS (52 mu m), and OS (192 mu m) than the other blocks (P<.01). The adaptation values of VS were significantly lower than those of the IPS block (P<.05). The adaption values of the LU and VE blocks were significantly lower than those of others (P<.01) but were statistically similar to one another (P>.05). IPS had the largest cement space at 18 mm(3) (P<.01). Conclusions. The marginal and internal adaptation values were within a clinically acceptable range for all 3 hybrids and nanoceramics tested.Öğe Fracture resistance of roots filled with three different obturation techniques(Medicina Oral S L, 2012) Topcuoglu, Huseyin-Sinan; Arslan, Hakan; Keles, Ali; Koseoglu, MustafaObjectives: The aim of this study was to compare in vitro root fracture resistance following root canal filling with AH 26 using lateral condensation, BeeFill, and Thermafil techniques. Study Design: Eighty extracted human mandibular premolars with similar dimensions were selected. In order to standardize the roots, measurements were taken in two separate regions of the teeth-at the cemento-enamel junction and 8 mm apically from the junction-buccolingual as well as mesiodistal for every tooth. Teeth were then randomly divided into five groups (n=16). With the exception of the non-prepared group (Group 1), instrumentation was done in all groups. In group 2, instrumentation but no filling was performed; in group 3, the obturation was done with AH 26 + gutta-percha; in group 4, with AH 26 + BeeFill and in group 5, AH 26 + a Thermafil obturator was used. All the roots were mounted vertically in copper rings and filled with acrylic resin, exposing 8 mm of the coronal part. A universal testing machine was used for the strength test. Results: The results were analyzed using the one-way ANOVA test. The significance between the groups was tested with Temhane's T2 test. The results indicate that instrumentation of root canals had a significant effect on fracture resistance (p<0.05). In addition, there were no differences between the root canal obturation techniques; furthermore, these techniques did not create a statistically important resistance to vertical fracture (p>0.05). Conclusions: The results suggest that instrumentation of root canals significantly weakens the tooth structure to fracture and the root canal obturation techniques that are used are not able to form reinforcement.Öğe Heat conductive properties of set root canal sealers(Informa Healthcare, 2013) Keles, Ali; Ahmetoglu, Fuat; Simsek, Neslihan; Yalcin, Muhammet; Ocak, Mevlut SinanObjective. The aim of this study was to examine the thermal conductivity of five different root canal sealers in vitro. Materials and methods. Sealapex, AH Plus, AH 26, Endomethasone and RoekoSeal root canal sealers were examined. These materials were prepared in accordance with the manufacturer's instructions and applied to standard molds. Three samples of each material were prepared. The samples were kept for 5 days under 37 degrees C conditions. Measurements were taken using a heat conduction unit (P. A. Hilton Ltd. Stockbridge, Hants, UK). The thermal conductivity coefficient was calculated for each sample using the Fourier equation. Coefficients were analyzed statistically by the Kruskal-Wallis test. Results. Significant differences were found for thermal conductivity between some materials (p < 0.05). The conductivity coefficient of AH Plus was found to be higher than those of the other materials (p < 0.05). No statistically significant differences were found between AH 26 and RoekoSeal (p > 0.05) and the conductivity coefficients of these sealers were found to be lower than those of the other materials (p < 0.05). No statistically significant differences were found between Sealapex and Endomethasone (p > 0.05) and the conductivity coefficients of these sealers were found to be lower than that of AH Plus but higher than those of RoekoSeal and AH26 (p < 0.05). Conclusions. The results showed that root canal sealers functioned as thermal insulators and had different heat-conductive properties that depended on their composition.Öğe Micro-computed tomography and histomorphometric analysis of the effects of platelet-rich fibrin on bone regeneration in the rabbit calvarium(Pergamon-Elsevier Science Ltd, 2015) Acar, Ahmet Huseyin; Yolcu, Umit; Gul, Mehmet; Keles, Ali; Erdem, Necip Fazil; Kahraman, Sevil AltundagObjective: The present study aimed to investigate the effectiveness of platelet-rich fibrin (PRF) on bone regeneration when used alone or in combination with hydroxyapatite (HA)/beta-tricalcium phosphate (beta TCP). Design: In this study, 20 New Zealand white rabbits were used and four calvarial defects were prepared in each animal. PEP, Straumann (R) Bone Ceramic (SBC), or PEP + SBC was applied to the defects; one defect was left untreated as a control. Ten rabbits were sacrificed at week 4(T-1) and 10 at week 8 (T-2). After micro-computed tomography (micro-CT) scanning, the samples were sent for histological and histomorphometric analysis to evaluate and compare the volume and area of regenerated bone. Results: Histomorphometric and micro-CT analysis showed that both PEP and SBC significantly increased bone regeneration at T-1 and T-2 (P < 0.01). When PEP was used in combination with HA/beta TCP, a further significant increase in new bone formation was observed at T-1 and T-2 compared with that when PRF or SBC was used alone (P < 0.01). Conclusions: PRF has a positive effect on bone formation when used alone and in combination with HA/beta TCP. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Oval-shaped canal retreatment with self-adjusting file: a micro-computed tomography study(Springer Heidelberg, 2014) Keles, Ali; Alcin, Hatice; Kamalak, Aliye; Versiani, Marco A.The aim of this study was to assess the efficacy of removing the filling material from oval-shaped canals with rotary retreatment files, with or without the additional use of self-adjusting file (SAF), using micro-computed tomography. Oval-shaped canals from 20 maxillary premolars were prepared and assigned to two groups (n = 10), according to the obturation technique: cold lateral condensation (CLC) or vertical condensation (VC). Then, retreatment procedure was performed with retreatment rotary instruments followed by SAF. The specimens were scanned after each procedure and the volume of the filling material calculated. Median and interquartile range (IQR) percentages of the remaining filling material after each retreatment technique were statistically compared by Wilcoxon and Mann-Whitney U tests with a significance level of 5 %. The median percentage volume of the filling residue after rotary retreatment procedure was 1.59 (IQR = 1.26) and 0.42 (IQR = 0.86) in the CLC and VC groups, respectively (p < 0.05). After the use of SAF, the median percentage was 1.26 (IQR = 0.75) and 0.12 (IQR = 0.53) in the CLC and VC groups, respectively (p < 0.05). Statistically significant difference was also observed within the group after the additional use of SAF (p < 0.05). None of the retreatment procedures completely removed the filling material. The additional use of the SAF improved the removal of filling material after the retreatment procedure with rotary instruments. Filling material left after retreatment procedure may harbour necrotic tissue and bacteria, which could lead to a persistent disease and reinfection of the root canal system. The additional use of self-adjusting file after the conventional retreatment procedures may improve root canal cleanliness, allowing a better action of the irrigating solution.Öğe Quality of different gutta-percha techniques when filling experimental internal resorptive cavities: A micro-computed tomography study(Wiley-Blackwell, 2014) Keles, Ali; Ahmetoglu, Fuat; Uzun, IsmailThe purpose of this ex vivo study was to determine the quality of root fillings in experimental internal resorptive cavities filled using cold lateral condensation (CLC), vertical condensation and Thermafil techniques. Forty-five extracted maxillary canine teeth were selected. After root canal instrumentation, the roots were sectioned horizontally and experimental internal resorption cavities were prepared. The root sections were re-approximated with a luting agent and randomly assigned to three groups (n = 15) to be filled using CLC, vertical condensation and Thermafil, respectively. Assessment of obturation quality in the internal resorptive cavity was performed using a desktop X-ray micro focus computed tomography scanner, and the percentage of gutta-percha (GP), sealer and voiding was calculated for each specimen. Data were statistically analysed using non-parametric tests, with P < 0.05 denoting a statistically significant difference. Vertical condensation filled 96.25 +/- 8.31% of the total artificial cavity, and was superior to CLC (63.20 +/- 16.87%) and Thermafil (59.26 +/- 18.47%). The mean percentage of voids was 3.75 +/- 8.31% in the vertical condensation group, 37.09 +/- 17.13% in the CLC group and 41.06 +/- 18.60% in the Thermafil group. We conclude that obturation of experimental resorption cavities is significantly better when using vertical condensation than when using other GP-based techniques.Öğe Remineralization effect of three different agents on initial caries and erosive lesions: a micro-computed tomography and scanning electron microscopy analysis(Bmc, 2023) Akkuc, Sibel; Duruk, Gulsum; Keles, AliBackgroundThis study aimed to investigate the remineralization efficiency of Sensodyne Promine containing Sodium flouride (NaF), GC Tooth Mousse containing CPP-ACP, and Agarta herbal toothpaste on initial caries and erosion using micro-computed tomography (CT) and scanning electron microscopy (SEM).MethodsForty-five third-molar teeth for micro-CT were divided into three main groups after initial scans (T-1) were completed. Artificial caries lesions were created with the demineralization cycle (group 1, n = 15) and artificial erosion lesions were created with orange juice (group 2, n = 15) and Cola (group 3, n = 15), and second scans (T-2) were performed. The groups were divided into three subgroups within themselves. Sensodyne Promine toothpaste (subgroup 1a, 2a, 3a), GC Tooth Mousse topical cream (subgroup 1b, 2b, 3b), and Agarta herbal toothpaste (subgroup 1c, 2c, 3c) were applied using soft-tipped brushes for 2 min, twice per day for 15 days, and then a third scan (T-3) was performed. Mineral density, surface area, and lesion volume and depth were calculated using micro-CT. Changes in the surface morphology of the teeth were examined using SEM in 13 samples representing each group, subgroup, and healthy enamel. In the analysis of the data obtained from the scans performed at three different times (T-1, T-2, T-3), one-way analysis of variance (ANOVA) with the post-hoc Tukey test, repeated measures ANOVA with the post-hoc Bonferroni test, and paired sample t-test analyses were used.ResultsAll three agents caused a statistically significant increase in mineral density, and a decrease in surface area and lesion volume and depth (p < 0.05). There was no statistically significant difference between the groups in remineralization efficiency (p > 0.05). A statistically significant difference was found between the groups regarding the mineral density of the tissue that increased after remineralization (NaF > CPP-ACP > He; p < 0.05).ConclusionThe remineralization efficacy of herbal toothpaste as an alternative to NaF and CPP-ACP was found to be successful.Öğe Removal of Filling Materials from Oval-shaped Canals Using Laser Irradiation: A Micro-computed Tomographic Study(Elsevier Science Inc, 2015) Keles, Ali; Arslan, Hakan; Kamalak, Aliye; Akcay, Merve; Sousa-Neto, Manoel D.; Versiani, Marco AurelioIntroduction: The aim of this study was to assess the efficacy of lasers in removing filling remnants from oval-shaped canals after retreatment procedures with rotary instruments using micro computed tomographic imaging. Methods: The root canals of 42 mandibular canines were prepared and obturated using the warm vertical compaction technique. Retreatment was performed with rotary instruments, and the specimens were distributed in 3 groups (n = 14) according to the laser device used in a later stage of retreatment procedure: Er:YAG, Er:YAG laser based photon-induced photoacoustic streaming, and Nd:YAG. The specimens were scanned in a micro computed tomographic device after root canal filling and each stage of retreatment at a resolution of 13.68 mu m. The percentage differences of the remaining filling material before and after laser application within and between groups were statistically compared using the paired sample t test and 1-way analysis of variance test, respectively. Significance level was set at 5%. Results: Overall, filling residues were located mainly in the apical third and into canal irregularities after the retreatrnent procedures. After using rotary instruments, the mean percentage volume of the filling remnants ranged from 13%-16%, with no statistical significant difference between groups (P > .05). Within groups, additional laser application had a significant reduction in the amount of the remaining filling materials (P < .05). A comparison between groups showed that Er:YAG laser application after the use of rotary instruments had a significantly higher removal of filling remnants (similar to 13%) than Er:YAG laser based photon-induced photoacoustic streaming (similar to 4%) and Nd:YAG (similar to 3%) (P < .05). Conclusions: None of the retreatment procedures completely removed the filling materials. The additional use of lasers improved the removal of filling material after the retreatment procedure with rotary instruments.Öğe Retreatment of flat-oval root canals with a self-adjusting file: An SEM study(Japanese Soc Dental Materials Devices, 2014) Keles, Ali; Simsek, Neslihan; Alcin, Hatice; Ahmetoglu, Fuat; Yologlu, SaimThis study evaluated the efficacy of the Self-Adjusting File (SAF) in removing the root filling remnants and smear layer left in oval shaped root canals after using R-Endo retreatment files, by using scanning electron microscopy (SEM). Forty eight maxillary premolars were prepared and the SAF was used in all of the teeth to remove debris and smear layer. Sixteen teeth were used as control and the other 32 teeth were obturated and randomly assigned to two groups according to the retreatment procedures: R-Endo retreatment files and R-Endo retreatment files+SAF. Then, all roots were split longitudinally for SEM evaluation. Using SEM pictures, the number of dentinal tubules and the surface area covered by filling remnants were evaluated. None of the techniques removed root filling remnants and smear layer completely. Additional use of SAF after the retreatment procedures may improve root canal cleanliness in the corona] and middle thirds of oval root canals.Öğe Unusual Root Canal Morphology of the Maxillary Second Molar: A Case Report(Hindawi Ltd, 2013) Simsek, Neslihan; Keles, Ali; Bulut, Elcin TekjnIntroduction. This clinical case report presents the successful endodontic treatment of a maxillary second molar that has a mandibular molar- like anatomy with no palatal root and with each of its roots containing two separate root canals. Cone-beam computed tomography (CBCT) was used to confirm this unusual anatomy. Methods. A 34-year-old male patient was referred to the Department of Endodontics at Inonu University's Faculty of Dentistry because of severe pain in his right maxillary second molar. Clinical and radiographic examinations identified unusual roots and root canals anatomy, and CBCT was planned in order to understand the nature of these variations. Cleaning and shaping procedures were performed using the crown down technique with Sybron Endo (Glendora, CA, USA) rotary instruments, and endodontic treatment was completed with gutta-percha cones and AH Plus resin sealers using the cold lateral compaction technique. Conclusions. The maxillary second molar exhibits aberrations and variations in terms of the numbers and configurations of its roots and root canals, and CBCT can be a useful imaging technique in endodontics.Öğe Use of Endo Vac System for Aspiration of Exudates from a Large Periapical Lesion: A Case Report(Elsevier Science Inc, 2015) Keles, Ali; Alcin, HaticeLarge cyst-like periapical lesions can heal after nonsurgical root canal treatment. Decreasing the hydrostatic pressure within a periapical lesion can be achieved with the aspiration technique by using Endo Vac when there is drainage of cystic fluid through the canals. Clinical examination of a 21-year-old male patient revealed a large periapical lesion extending from the distal aspect of tooth #26 and reaching the mesial surface of tooth #22. During root canal treatment of teeth #23, #24, and #26, serous exudate drained from the root canal of tooth #24. The MacroCannula component of Endo Vac apical negative pressure irrigation system was used to aspirate the inflammatory fluid. The technique produces a vacuum effect in the periapical region through the root canal, which facilitates evacuation of large amounts of exudate. Two-year clinical and radiographic examinations revealed resolution of the mandibular radiolucency,. and the adjacent tooth #25 retained its vitality. The healing of a large periapical lesion can be achieved by the correct diagnosis and the proper treatment approach, without the need for surgery. EndoVac negative irrigation system might be useful for intracanal aspiration of exudates.
