Cilt:48 Sayı:01 (2021)

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https://dspace.ankara.edu.tr/handle/20.500.12575/77272

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Browsing Cilt:48 Sayı:01 (2021) by Author "Other"

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    A rare presentation of radicular cyst: a case report and review of literature
    (Ankara Üniversitesi Diş Hekimliği Fakültesi, 2021) Jagtap, Rohan; Other; Other
    The radicular cyst is the most common inflammatory odontogenic cyst in the jaws. It is a periapical lesion associated with non-vital teeth in the tooth-bearing regions of the jaws with a slight male predilection. A radicular cyst is typically asymptomatic, but if large or secondarily infected may cause swelling. The usual radiographic appearance of a radicular cyst is that of a periapical radiolucent lesion. This case report documents a rare case of 61-year-old male with a mixed-density periapical lesion diagnosed as a radicular cyst. The lesion presented as a well-defined, expansile, space occupying, corticated, sclerotic, hydraulic, unilocular, mixed density lesion, associated with the right mandibular second premolar that was predominantly radiolucent with scattered foci of radiopacities. Microscopic examination revealed fragments of lining epithelium along with small fragments of inflamed fibrous connective tissue, aggregates of necrotic cellular debris, and bacterial colonies intermixed with foci of dystrophic calcifications. The histopathological diagnosis was a radicular cyst with dystrophic calcification. Although rare, this entity should be considered in the differential diagnosis of mixed-density periapical lesions. Complete history and proper diagnosis is important in this type of rare cases as treatment varies between a radicular cyst and other odontogenic neoplasms.
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    Color stability and surface roughness of resin based direct and ındirect restorative materials
    (Ankara Üniversitesi Diş Hekimliği Fakültesi, 2021) Ersöz, Bilge; Other; Other
    This study investigated discoloration and surface roughness (Ra) in resin-based computer aided design (CAD)/computer aided manufacturing (CAM) blocks and direct and indirect composite resins. Using a Teflon mold, disc shaped specimens (8×2 mm2) were fabricated from direct (Estelite Asteria and GrandioSO) and indirect (Gradia Plus) composite resins, and specimens (12×14×2 mm3) were prepared from composite resin CAD/CAM blocks (Vita Enamic, Brilliant Crios, and Cerasmart) (n=10). A profilometer was used to determine the Ra values of all 60 polished samples. These specimens were thermocycled between 5 and 55°C for 3,000 cycles, and they were immersed in coffee solution (37°C) for 1 and 7 days. A spectrophotometer was used to determine the color change (∆E00) with the CIEDE2000 formula after the specimens were polished. ANOVA TUKEY test was performed to analyze the data. The lowest degree of discoloration among the materials tested was found in Vita Enamic (<0.05), whereas the highest degree of discoloration was found in the Gradia Plus indirect composite (<0.05). Direct composite resins have a higher discoloration potential over resin-based CAD/CAM blocks, whereas they are less prone to discoloration than indirect composite resins.
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    Evaluation of shear bond strength of different resin cements after zirconia surface treatments
    (Ankara Üniversitesi Diş Hekimliği Fakültesi, 2021) Hayran, Yeliz; Other; Other
    Aim: The aim of the study was to evaluate the shear bond strength (SBS) of different resin cements after zirconia surface treatments Materials and Methods: A total of 60 zirconia discs (3x7mm) were prepared and divided into 3 main groups according to the surface treatments as control (C), sandblasting (SB), and tribochemical silica coating (TC). Main groups were divided into two subgroups according to two different resin cements were applied. No surface treatment was applied to the samples in C group. 50μm Al2O3 particles were applied to the samples in SB group for 10 s at a distance of 10 mm under 4 atm. TC group were tribochemically coated with alumina particles. Self-adhesive resin (ME) and multi-system dual-cure adhesive resin (NX3) was applied to the subgroups. After cementation, all samples were tested for SBS. SBS values were statistically analyzed by the Kruskal-Wallis and Mann-Whitney U tests. Results: Regardless of the cement type, SBS values of the surface treated samples were statistically different (p <0.001). Group SB was determined as the group with the highest SBS value. This group was followed by Group C and Group TC, respectively. The SBS values of the samples according to the resin cements and surface treatments were statistically significantly different (p<0.001). SBS values of the samples cemented with NX3 resin cement were found to be higher than the samples treated with ME resin cement. Conclusion: SB increased resin bond to zirconia. It is more advantageous to use multi-system dual cure adhesive cements in zirconia cementation.
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    Evaluation of the effect of osteoporosis on mandible with mandibular ındexes using panoramic radiography and cone beam computed tomography
    (Ankara Üniversitesi Diş Hekimliği Fakültesi, 2021) Bilgili, Ersen; Other; Other
    Purpose: The purpose of the study is to evaluate the effects of osteoporosis (OP) using panoramic mandibular index (PMI) and mandibular cortical index (MCI) in panoramic radiographic and cone-beam computed tomographic (CBCT) images and to demonstrate any advantages of CBCT versus panoramic imaging in those indexes. Materials & Methods: 36 female patients (18 with osteoporosis and 18 with no systemic disease) who had panoramic radiographic and CBCT indication due to dental problems were involved in the study. PMI and MCI are evaluated on both panoramic and CBCT images. Differences between patient groups are analyzed by the Kruskal Wallis test, and differences between imaging techniques are analyzed by impaired t-tests ignoring patient groups in confidence interval 95%. Results: In CBCT images, PMIs were significantly lower in patients with osteoporosis than in the control group (p=0.004), and there was no significant difference between the patient and control group in panoramic images (p=0.085). In both imaging techniques, MCIs were significantly higher in the osteoporosis group than in the control group (p=0.000). CBCT showed a significant advantage on PMI to panoramic images (p=0.05). Conclusion: Systemic diseases affect bone tissue in different levels, and to evaluate these effects, cortical and trabecular bone parts must be investigated separately, and findings must be combined with patients’ clinical symptoms. CBCT has advantages in PMI evaluations to panoramic radiography.