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Öğe Adhesion of two new glass fiber post systems cemented with self-adhesive resin cements(MDPI Multidisciplinary Digital Publishing Institute, 2019) Özlek E.; Neelakantan P.; Matinlinna J.P.; Belli S.; Ugur M.; Kavut I.The aim of this in vitro study was to evaluate the adhesion strength of two new fiber post systems (FiberSite™ Post and Cytec™ Blanco Post) cemented with two different adhesive resin cements (Panavia™ SA and Maxcem™ Elite). Root canals of sixty extracted human mandibular premolars were prepared using ProTaper Universal™ rotary files (Dentsply Sirona Endodontics, York, PA, USA). The root canals were irrigated with 5.25% sodium hypochlorite (NaOCl) during instrumentation. After root canal preparation, the canals were irrigated with 2 mL of 17% EDTA (1 min), followed by 2 mL of 5.25% (5 min) NaOCI, and 2 mL saline. The root canals were dried with paper points and divided randomly into two study groups (n = 30) according to the type of post system: Group 1, FiberSite™ Post (MegaDental, Partanna, Italy); and group 2, Cytec™ Blanco Post (Hahnenkratt, Königsbach-Stein, Germany), with one of the two adhesive resin cements: Subgroup A, Panavia™ SA Cement Plus Automix (Kuraray, Osaka, Japan); subgroup B, Maxcem™ Elite (Kerr, Orange, CA, USA). Following thermocycling, the adhesion strength was evaluated using the push-out adhesion (bond) strength test. Fractographic analysis was performed using stereomicroscope. The data were analyzed using two-way analysis of variance (p = 0.05). The adhesion strength values of both the posts were significantly higher when cemented with subgroup B (Maxcem™ Elite). The highest adhesion strength value was demonstrated by group 1B (FiberSite™ post cemented with Maxcem™ Elite cement). The type of post did not have a significant impact on the bond strength values for either cement material. © 2019 by the authors.Öğe The effect of cavity shape and hybrid layer on the stress distribution of cervical composite restorations(2011) Eliguzeloglu E.; Eraslan O.; Omurlu H.; Eskitascioglu G.; Belli S.Objectives: The aim of this finite elemental stress analysis study was to evaluate the effect of cavity shape and hybrid layer on the stress distribution of the mandibular premolar tooth under occlusal loading. Methods: The mandibular premolar tooth was selected as the model based on the anatomical measurements suggested by Wheeler. Four different mathematical models were evaluated: 1) a saucer-shaped non-carious cervical lesion restored with a composite without a hybrid layer, 2) a saucer-shaped non-carious cervical lesion restored with a composite with a hybrid layer, 3) a wedge-shaped non-carious cervical lesion restored with a composite without a hybrid layer, and 4) a wedge-shaped non-carious cervical lesion restored with a composite with a hybrid layer. A 200 N force was applied from the buccal tubercule and central fossa of the premolar tooth. The findings were drawn by the SAPLOT program. Results: In models 2 and 4, the output showed that a hybrid layer acts as a stress absorber. Additionally, when the cavity shape was changed, the stress distribution was very different. Conclusions: Cavity shape and hybrid layer play an important role in stress distribution in cervical restorations.Öğe Effects of intracanal medicaments and the remaining cavity wall on fracture strength of endodontically treated molars [Efeitos dos medicamentos intracanais e do muro de cavidade remanescente na força de fratura dos molares endodonticamente tratados](Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos, 2018) Olcay K.; Coban A.N.; Belli S.Objective: The aim of this study was to investigate the effects of the short-term intracanal application of two medicaments on the fracture strength of root-filled molar teeth with different levels of tooth structure loss. Material and Methods: Standard access cavities of totally 84 intact maxillary molar teeth were prepared in 72 teeth and were divided into 3 main groups. Standard access cavities were vkept in the first group, while mesio-occlusal-distal cavities (MOD) were prepared in the second and third groups. One-half of the palatinal walls were removed in the third group. Twelve sound teeth were used in the fourth group as control. Each group was then assigned into two subgroups according to the medicament used (n=12): 2% chlorhexidine gel and calcium hydroxide. Samples were stored at 37°C and 100% humidity for 1 week. Then the teeth were inserted into a universal testing machine and vertically loaded (5 mm/min) from the occlusal surface. The data was recorded in Newtons and statistically evaluated using a Univariate ANOVA and a Tukey as post hoc test. Results: A significant difference was found among the test groups (p<0.01). No significant difference was found according to the medicament used (p>0.05), however the number of remaining walls significantly affected the fracture strength (p<0.01). The first group with access cavity showed mostly repairable fractures (60%–80%) whereas the others showed mostly nonrepairable fracture patterns (60%–90%). Conclusion: In conclusion, the fracture strength of endodontically treated teeth is related to the structure loss rather than the intracanal medicament used. © 2018, Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos. All rights reserved.Öğe In vitro evaluation of the dissolving effect of solvents on root canal sealers.(2003) Erdemir A.; Adanir N.; Belli S.The purpose of this in vitro study was to evaluate two commonly used gutta-percha solvents for their effectiveness in dissolving several types of root canal sealers. Seven different sealers (AH26, AH Plus, Diaket, Roekoseal, Sankin Apatite Root Sealer, Sealapex, and Sultan U/P) were used in this study. After mixing according to the manufacturers' directions, each material was syringed into 30 glass capillary tubes, and a total of 210 tubes were placed in a humidifier at 37 degrees C for one week to allow the materials to set completely. Each group of 30 tubes, obturated with one type of sealer, was then randomly divided into three subgroups, including 10 tubes each. Chloroform was used in the first ten tubes from each sealer group. Halothane was used for the second group. In the last group, the sealer was removed with files, without using any solvent. The time necessary to pass a file through to the end of the tube was recorded for each sample in seconds. Results were analyzed using one-way analysis of variance. Sealapex did not set at all unless in contact with air. Roekoseal did not adhere to the glass capillary tubes, and was therefore easily removed from the tube in all samples. AH26 and AH Plus root canal sealers tightly adhered to the tube walls, so none of the techniques were effective in removing them from the tubes within 30 min. Diaket root canal sealer was easily removed using solvents (P < 0.05). There was no advantage in using solvents to remove Sankin Apatite Root Sealer (P > 0.05). Solvents were found to be very effective in dissolving the Sultan U/P root canal sealer (P < 0.05).Öğe Prevalence of vertical root fracture in extracted endodontically treated teeth: A prospective study(Cumhuriyet University Faculty of Dentistry, 2017) Olcay K.; Ataoğlu H.; Belli S.Objectives: Vertical root fracture (VRF) is one of the complications of endodontic treatment which results extraction of the related tooth. The purpose of this prospective study was to evaluate prevalence of VRF in extracted endodontically treated teeth. Materials and Methods: During a 1 year period 241 teeth were observed. All of the cases were from extracted teeth after endodontic treatment. Clinical signs, symptoms, the informations about patient and related tooth were recorded. Results: A total of 17 (7.02%) cases of VRF occurring among 241 cases were observed. The VRF occurred most frequently in the mesial roots of the mandibular first molars (23.5%) and they were the most frequently extracted teeth (35.2%). The VRF prevalence of maxillary first molars was 23.5%, maxillary first and second premolars with a same frequency (11.7%) were the following most fractured teeth. The fractures were predominantly buccolingual and were more frequent in female patients (58.8%). The mean patient age was 36 years and the mean time to VRF was 45 months. Most of the teeth which undergo VRF had a composite restoration (41.1%). 23.5% of the teeth had a post restoration and from among these posted teeth 75% were fully crowned. VRF was found similar frequency in mandibular teeth and in maxillary teeth (p > 0.05). Conclusions: After average of 45 months from endodontic treatment, mandibular first molar teeth were found most frequently prone to extraction due to VRF. Further investigation is necessary to determine the possible causes and evidence of fracture development. © 2017 Cumhuriyet University Faculty of Dentistry.
