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    CBCT Visualization of Furcation Perforation Repair Materials Using Different Voxel Sizes
    (Marmara Univ, Inst Health Sciences, 2021) Orhan, Ayse Isil; Tufenkci, Pelin; Oncu, Aysenur; Sevgi, Sevinc; Celikten, Berkan; Orhan, Kaan
    Objective: Three-dimensional cone-beam computed tomography is gaining popularity as an imaging modality aiding the performance of difficult endodontic treatment procedures. For this reason, we assessed the visualization of bioactive furcal perforation repair materials in an ex vivo study using CBCT with different voxel sizes and determined which voxel size yielding the best images with least artefacts. Visualization of endodontic restorative material is affected by the appearance of various artifacts. This study was conducted to evaluate the CBCT visualization of three perforation repair materials using five different voxel sizes. Methods: This study was performed with 84 mandibular molars that had been extracted for various reasons. All samples were measured with a digital caliper (Digimess, Sao Paulo, Brazil), marked at 3 mm above the cementoenamel junction, and decoronized at this line. The root segments were amputated at 3 mm below the furcation site using diamond discs under water cooling. The openings of the pulp chamber created, following the furcation defects formed. Biodentine, MTA, and EndoSequence were mixed following the manufacturers' instructions and applied to the perforation sites. Five image sets were obtained: 75 micron, 100 micron, 150 micron, 200 micron, and 400 micron. 2 examiners were evaluated the images independently. Results: The best image quality for all repair materials obtained in 100 micron. Image clarity of repair materials showed no significant difference among voxel sizes of 75 and 150 micron. Image quality was significantly reduced at 200 and 400 micron voxel sizes, and the worst quality was obtained at 400 micron voxels in all groups. Conclusions: CBCT imaging can be used to examine endodontic repair materials with adjustment of the effective radiation dose rate and selection of the appropriate voxel size.
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    Comparative Evaluation of the Push-Out Bond Strength of Root-End Filling Materials by Using Different Condensation Methods
    (Galenos Publ House, 2022) Tufenkci, Pelin; Sevgi, Sevinc; Oncu, Aysenur; Sevimay, Fatma Semra; Celikten, Berkan
    BACKGROUND/AIMS: This study aims to evaluate effect of the application of ultrasonic devices in the simulation models with the push-out test and compare with traditional methods during transfer of bioactive materials to the root canal. MATERIALS AND METHODS: In our study 60 extracted human single-root mandibular premolars without caries, root resorption, or fractures were used. The samples were standardized and divided into four sections randomly. Samples were embedded to alginate impression material for simulating the periapical tissue. Group 1; 4 mm of the apical of teeth were obturated with mineral trioxide aggregate (MTA) (Angelus, Brazil) and condensed by plugger. Group 2; 4 mm of the apical of teeth were obturated with MTA and condensed by plugger and ultrasonic activation. Group 3; 4 mm of the apical of teeth were obturated with Biodentine (Septodont, France) and condensed by plugger. Group 4; 4 mm of the apical of teeth were obturated with Biodentine and condensed by plugger and ultrasonic activation. The push-out test was performed using a universal testing machine. RESULTS: According to result of this study, ultrasonic activation groups (groups 2 and 4) of bond strength values were better than plugger condensation groups (groups 1 and 3) of bond strength values (p<0.05). CONCLUSION: The bond strength of bioactive materials used in single visit apexification is an important factor for the success of the treatment in the future. According to the results of this study, the application of materials by ultrasonic activation shows higher bond strength than hand condensation in the application of MTA and Biodentine to the apical region of immature teeth.
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    Evaluation of the sealing ability of different root canal sealers: a combined SEM and micro-CT study
    (Univ Sao Paulo Fac Odontologia Bauru, 2018) Huang, Yan; Orhan, Kaan; Celikten, Berkan; Orhan, Ayse Isil; Tufenkci, Pelin; Sevimay, Semra
    Objective: The purpose of this study was to analyze the ability of multiple compounds to seal the dental tubules using scanning electron microscopy (SEM) and micro-computed tomogra-phy (micro-CT). Material and Methods: Twenty-four single-root human mandibular premolars were selected and instrumented with nickel-titanium rotary file and the final file size was # 40/06. They were then randomly allocated into 2 groups, and all samples were filled with single cone gutta-percha (# 40/06) and one of the tested sealers (AH Plus and EndoSequence BC sealers). All specimens were scanned using micro-CT and then three from each group were randomly selected for SEM analysis. Results: According to SEM, both root canal sealers showed sufficient adaptation to dentin along the whole length of the root canal, though the coronal sections presented superior sealing than the apical sections. Micro porosity analyses revealed that the volume of closed pores and the surface of closed pores had the largest values in the coronal sections, followed by the middle and the apical sections for both sealants (p<0.05). However, no significant difference was observed for those two parameters between AH Plus and EndoSequence BC sealers in any of the three sections (p>0.05), whereas they were larger in the apical section when the AH Plus sealer was used. Conclusions: By using the single cone technique, neither EndoSequence or AH Plus pro-vides a porosity-free root canal filling. The EndoSequence BC sealer may have similar sealing abilities regarding the whole root canal as the AH Plus sealer. A better sealing effect could be obtained in the coronal and middle sections of a root canal than the apical part by using the tested sealers.
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    Micro-CT assessment of the sealing ability of three root canal filling techniques
    (Nihon Univ, School Dentistry, 2015) Celikten, Berkan; Uzuntas, Ceren F.; Orhan, Ayse I.; Tufenkci, Pelin; Misirli, Melis; Demiralp, Kemal O.; Orhan, Kaan
    This study used micro-CT to compare three obturation techniques with respect to void occurrence in canals filled with bioceramic sealer. Thirty extracted first mandibular premolars were prepared with a ProTaper Universal system and randomly allocated to three groups. Canals were obturated with gutta-percha and bioceramic root canal sealer, using either single-cone, lateral compaction, or Thermafil filling technique. Each tooth was then scanned with micro-CT. Voids in 2D cross-sectional images and void volumes in 3D images of all root thirds were assessed in relation to obturation technique. There was no significant difference between obturation techniques in the proportion of sections with voids (P > 0.05). However, the results of the obturation techniques significantly differed in relation to root region (P < 0.05). In conclusion, no root filling technique resulted in void-free specimens. Void volumes were highest for the single-cone technique and lowest for Thermafil, in all regions (P < 0.05).