Papers by Funda K O N T ÇOBANKARA
Journal of Pediatric Dentistry, May-Aug 2013;1(2), 2013
The aim of this study was to evaluate the cytotoxic effects of five different resin-based root ca... more The aim of this study was to evaluate the cytotoxic effects of five different resin-based root canal sealers: EndoREZ, Epiphany SE, EZ-Fill, MMSeal and AHPlus. Set materials were extracted in culture medium and cytotoxicity was determined in two cell lines, human osteosarcoma cell line (Saos-2) and mouse skin fibroblast cells (L929). The cells were incubated in contact with elutes for 24 h. The cell mitochondrial activity was evaluated by the methylthiazole tetrazolium assay. Results demonstrated that all sealers showed a reduced vital cell number in comparison with the control group (P < 0.05). For L929 cells, the ranking of the most to the least toxic material was: EZ-Fill (12.0%) = EndoREZ (12.1%) = AHPlus (12.4%) > MMSeal (44%) = Epiphany SE (46.2 %). For Saos-2 cells revealed that cell survival with extracts of EndoREZ, Epiphany SE, EZ-Fill, MMSeal and AHPlus was 33.9%, 32.9 %, 33.1%, 35.3% and 34.6%, respectively, all tested sealers showed moderate cytotoxicity. Based on the results obtained from the present study, all tested resin-based sealers appear to show toxicity potential to both cells in spite of different toxicity degrees. Therefore, better sealers need to be developed with acceptable biological properties for root canal filling.
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The aim of this study was to evaluate the biocompatibility of epoxy-resinbased AHPlus, salicylate... more The aim of this study was to evaluate the biocompatibility of epoxy-resinbased AHPlus, salicylate-based MTA-Fillapex and calcium silicate-based iRootSP root canal sealers. Cytotoxicity was assessed by XTT test. The extracts from sealers of different setting times were serially diluted. Cell viability was calculated as the percentage of the control group (100%). The optimal concentration of each sealer was used at genotoxicity test, and micronuclei formations were detected. Statistical analyses were done by using Kruskal-Wallis and Dunn post hoc test with Bonferroni correction. AHPlus and MTA-Fillapex showed the lowest percentage of cell viability at higher concentrations (1:1, 1:2, 1:4), especially at first 12 h. iRootSP showed higher viability at all concentrations and times than AHPlus and MTA-Fillapex. At genotoxicity assay, AHPlus increased the number of micronuclei. MTA-Fillapex slightly induced micronucleus formation (not significant) and iRootSP was not increased. In conclusion, calcium silicate-based iRootSP had lowest cytotoxic and genotoxic potential and can be considered as a highly biocompatible material.
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Effect of a new restoration technique on fracture resistance of endodontically treated teeth, 2008
Abstract – The aim of the study was to investigate the effect of a new fiberreinforced composite ... more Abstract – The aim of the study was to investigate the effect of a new fiberreinforced composite restoration technique on fracture resistance in endodontically treated premolars. Eighty sound extracted human mandibular premolars were assigned to four groups (n = 20). Group 1 did not receive any treatment. In groups 2, 3 and 4, the teeth received root canal treatment and a mesiooccluso-distal cavity preparation. Group 2 was kept unrestored. Group 3 was restored with a dentin bonding system and composite resin. In group 4, a piece of polyethylene ribbon fiber was inserted into the groove in a buccal to lingual direction during the restoration of teeth with dentin bonding system and composite resin. After finishing and polishing, the specimens were stored in 100% humidity at 37C for 24 h and placed at an angle of 45 to the long axis of the tooth and subjected to compressive loading in a universal testing machine at a crosshead speed of 0.5 mm min-1). The load necessary to fracture the samples was recorded in Newton (N) and submitted to Kruskal–Wallis anova and Mann–Whitney U-test. The fracture strength of the teeth reinforced with a combination of polyethylene fiber and composite resin were not significantly different than those that were restored with only composite resin (P > 0.05). However, most of the failure modes of the reinforced teeth were limited to the level of the enamel, while the other three groups showed fractures generally at the level of the dentin, cemento-enamel junction, or more below (P < 0.05).
Therefore, polyethylene ribbon fiber-reinforced composite resin restorations seemed a more reliable restorative technique than traditional composite restorations for extensive cavities.
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DergiPark (Istanbul University), Nov 2, 2014
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Acta Stomatologica Croatica, 2020
Objectives This study assessed the antibacterial activity of both separate and combined uses of 5... more Objectives This study assessed the antibacterial activity of both separate and combined uses of 5.25% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX), 17% ethylenediaminetetraacetic acid (EDTA), 3% hydrogen peroxide (H2O2), MTAD, SmearClear (SC) and 13.8% chlorine dioxide (ClO2) irrigation solutions against Enterococcus faecalis. Materials and Methods Two hundred eighty single rooted human premolars were randomly grouped into 26 test and 2 control (negative and positive) groups and were incubated for 24 h with E. faecalis, except for the negative control group. The tested solutions were as follow: NaOCl; CHX; ClO2; MTAD; SC; EDTA; H2O2; NaOCl + CHX; NaOCl + MTAD; SC + NaOCl; EDTA + NaOCl; H2O2 + NaOCl; ClO2 + CHX; CHX + MTAD; SC + CHX; EDTA + CHX; CHX + H2O2; ClO2 + MTAD; SC + ClO2; EDTA + ClO2; ClO2 + H2O2; SC+MTAD; EDTA+MTAD; MTAD + H2O2; SC + H2O2; and EDTA + H2O2. Optic density values were recorded at 0, 6, 12, 18, 24, 30, 36, 42 and 48 h and bacterial growth curve created f...
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... DEgERLENDÌRÌLMESÌ IN VITRO EVALUATION OF THE EFFECT OF TWO DIFFERENT SOLVENTS ON RESIN BASED ... more ... DEgERLENDÌRÌLMESÌ IN VITRO EVALUATION OF THE EFFECT OF TWO DIFFERENT SOLVENTS ON RESIN BASED SEALERS Funda KONT ÇOBANKARA ... Rezin Esasli Pattar üzerine Cözücülerin Etkisi Iam 225 adet tüp doldurularak materyallerin tarn sert-lige ula§malan ...
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Journal of Evolution of Medical and Dental Sciences, 2019
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Turkiye Klinikleri Dis Hekimligi Bilimleri Dergisi, 2001
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Objectives: The aim of this study was to evaluate the effectiveness of 3% mepivacaine plain and 2... more Objectives: The aim of this study was to evaluate the effectiveness of 3% mepivacaine plain and 2% mepivacaine (1:20.000 levonordephrine) applicated by the computer controlled anesthetic delivery system (CCADS) (Wand-Plus, Milestone Scientific) and conventional syringe for inferior alveolar nerve blocks (IANB) in patients with irreversible pulpitis. Methods: One hundred-twenty adult patients, between the ages of 1835, participated in current study. Each patient had a tooth that fulfilled the criteria for a clinical diagnosis of irreversible pulpitis. The 120 patients randomly divided into two main groups as IANB with conventional syringe (n=60) and IANB with the CCADS (n=60). Each main group divided into two subgroups: the patients of the first group received 1.8ml 3% mepivacaine plain or 1.8ml 2% mepivacaine (1:20.000 levonordephrine) with the conventional syringe and the patients in the second group received 1.4 ml 3% mepivacaine plain or 1.4 ml 2% mepivacaine (1:20.000 levonordep...
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SUMMARY In this study, incidences of root canal treatment performed by undergraduate students wer... more SUMMARY In this study, incidences of root canal treatment performed by undergraduate students were evaluated in depending on the age, sex, tooth and location along an education year at the Endodontic Department, Faculty of Dentistry, and University of Selcuk. The 2024 patients in the study had total number of 2237 teeth which required root canal treatment. Female patients (51.1 %) received endodontic therapy higher than male patients (48.9 %). In every age group, endodontic treatment performed in the maxilla (57 %) was more than in the mandible (43 %). In the age group between 20 and 29 was needed the most frequency for root canal treatment. Such datas will be useful in helpful in formulating endodontic curriculum and will be directed toward more research that compares among population of factors which affect treatment outcomes.
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Journal of Endodontics, 2011
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Implant Dentistry - A Rapidly Evolving Practice, 2011
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Journal of endodontics, 2006
The aim of this in vitro study was to evaluate the apical seal obtained with four root canal seal... more The aim of this in vitro study was to evaluate the apical seal obtained with four root canal sealers: Rocanal 2, Sealapex, AH Plus, and RC Sealer. Forty root canals were prepared using the step-back technique. The specimens were divided into four groups of 10 samples and obturated by laterally condensed gutta-percha with one of the tested sealers. The computerized fluid filtration method was used for evaluation of apical sealing properties. The quantitative apical leakage of each specimen was measured after 7, 14, and 21 days. Statistical analysis indicated that the apical leakage of all sealers used in this study decreased gradually from 7 days to 21 days (p < 0.05). Sealapex showed better apical sealing than the other sealers at 7, 14, and 21 days (p < 0.05). RC Sealer, AH Plus, and Rocanal 2 showed similar apical leakage values at every period (p > 0.05).
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Journal of endodontics, 2002
The purpose of this in vitro study was to test the effect of Ketac-Endo (KE) and AH 26 on resista... more The purpose of this in vitro study was to test the effect of Ketac-Endo (KE) and AH 26 on resistance to root fracture and also to evaluate the effect of smear layer. Seventy-two human maxillary canine teeth were randomly divided into six groups (n = 12) and were prepared using six different methods: group 1: KE, without smear layer (smear -); group 2: KE, with smear layer (smear +); group 3: AH 26, smear (-); group 4: AH 26, smear (+); group 5 (negative control): nonprepared; group 6 (positive control): prepared but unfilled. After storing 1 week in 100% humidity at 37 degrees C, the coronal lingual walls and root canal spaces were lowered 2 mm below the buccal walls of the roots. The samples were placed into acrylic resin blocks so that 10 mm of buccal roots were exposed and were placed in a specially designed steel pad at an angle of 15 degrees to the long axis of the root. A slowly increasing force was applied at the junction of the buccal wall and root canal space until fracture...
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Journal of Endodontics, 2004
The aim of this in vitro study was to determine the effect of the smear layer on apical and coron... more The aim of this in vitro study was to determine the effect of the smear layer on apical and coronal leakage in root canals obturated with AH26 or RoekoSeal sealers. A total of 160 maxillary anterior teeth extracted for periodontal reasons were used. The root canals were prepared to a size #7 with ProFile.06 taper Series 29 rotary instruments in a crown-down manner. Eight groups were created by all possible combinations of three factors: smear layer (present/absent), leakage assessment (apical/coronal), and sealer used (AH26/RoekoSeal). All teeth were obturated using lateral condensation technique of gutta-percha. A fluid filtration method was used to test apical or coronal leakage. According to the results of this study, the smear (+) groups displayed higher apical and coronal leakage than those smear (-) groups for both root canal sealers (p &amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05). There was no statistically significant difference in either apical or coronal leakage between RoekoSeal and AH26, regardless of the presence or absence of the smear layer (p &amp;amp;amp;amp;amp;amp;amp;amp;gt; 0.05). However, apical leakage was significantly higher than coronal leakage for both root canal sealers used in this study (p &amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05). Under the conditions of this study, the results indicate that removal of the smear layer has a positive effect in reducing apical and coronal leakage for both AH26 and RoekoSeal root canal sealers.
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Papers by Funda K O N T ÇOBANKARA
Therefore, polyethylene ribbon fiber-reinforced composite resin restorations seemed a more reliable restorative technique than traditional composite restorations for extensive cavities.
Therefore, polyethylene ribbon fiber-reinforced composite resin restorations seemed a more reliable restorative technique than traditional composite restorations for extensive cavities.