Cilt:49 Sayı:01 (2022)

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https://dspace.ankara.edu.tr/handle/20.500.12575/84780

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Browsing Cilt:49 Sayı:01 (2022) by Author "Diş Hekimliği Fakültesi"

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    Cyclic Fatigue Resistance and SEM Evaluation of Fractured Instrument Surfaces; Comparison of ProTaper Universal and ProTaper Gold Files
    (Ankara Üniversitesi, 2022) Tezer, Emine Odabaşı; Diş Hekimliği; Diş Hekimliği Fakültesi
    Purpose:To compare the cyclic fatigue resistance of ProTaper Universal (PTU) and ProTaper Gold (PTG) nickel titanium files at different angles and to examine the fractured surface areas by using scanning electron microscope (SEM). Materials and Methods: A special static test device made of stainless steel with artificial canals at 3 different angles. The files were rotated until they were broken in artificial canals with 45°, 60° and 90° angles and also the time was recorded using a digital stopwatch. The number of cycles to failure was calculated for each instrument. Statistical analyzes were made by using one-way analysis of variance (Anova) for comparison between main groups. Results: PTG files showed higher fatigue resistance (p<0.001) than PTU files in all groups. SEM results displayed similar characteristic structures in pits and fissures caused by fracture due to cyclic fatigue regardless of angle and file type. Conclusion: Although surface properties of broken instruments do not play a decisive role in clinical practice it was observed that heat-treated Ni-Ti files exhibited higher fatigue resistance at all angles compared to conventional files according to the number of cycles during experimental period
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    Diagnosis of Early Dental Caries by Traditional, Contemporary and Developing Imaging Methods
    (Ankara Üniversitesi, 2022) Akyıldız, Emine; Diş Hekimliği; Diş Hekimliği Fakültesi
    Dental caries is an important problem for human health which is frequently seen under clinical conditions and also progresses slowly, causes severe pain and even tooth loss, and affects the quality of life. Especially in pediatric patients, with the early detection of caries, treatment procedures can be performed with uncomplicated methods. In today's dentistry; preventive applications and minimally invasive approaches are gaining importance, and early diagnosis of initial caries lesions is very important for minimally invasive dentistry. With the development of technology, many new methods are being introduced to ensure the early diagnosis of dental caries. In this review, conventional, contemporary, and developing approaches used in the detection of dental caries will be presented.
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    New Classification of Intraoral Phosphor Plate Artifacts Based on Literature Review
    (Ankara Üniversitesi, 2022) İncebeyaz, Burak; Diş Hekimliği; Diş Hekimliği Fakültesi
    AIM: Artifacts (error) encountered in phosphor plates (PSP) used in intraoral digital imaging were evaluated under a new classification. METHODS: In our study, when obtaining images with intraoral phosphor plates, artifacts before, during, after the irradiation and artifacts caused by the scanner were determined according to review of the literature. RESULTS: Intraoral radiographs are obtained while many artifacts are encountered. These artifacts can occur in both conventional and digital systems. Artifacts that ocur before irradiation such as scratches, cracks, fingerprints, dust particles, bite marks, plate edge peeling; during irradiation such as positioning error, motion artifact, shooting from different angles errors, cone-cut, double image, light-dark images, glare, fading, revers irradiation , refraction, distortion; after irradiation such as irregular image density, noise, writing artifact, fingerprints, fading artifacts; and depending on the scanner artifacts such as inclined placement, a parallel line to scan direction, dust fragment, plate size determination error has been shown to be visible. CONCLUSION: An inaccurate image with no diagnostic value requires regeneration. For this reason, knowing the causes of artifacts in radiographic images is important for the patient, the environment, and the practitioner to prevent unnecessary x-rays (radiation).
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    The Prevalence of Radix Paramolaris and Entomolaris in Mandibular Molar Teeth: A Retrospective Study
    (Ankara Üniversitesi, 2022) Gökdeniz, Seyide Tuğçe; Diş Hekimliği; Diş Hekimliği Fakültesi
    Abstract Objective: The aim of this study is to analyze the frequency of radix paramolaris (RP) and radix entomolaris (RE) in the first and second molars using cone beam computed tomography (CBCT). Materials and Methods: The CBCT images of a total of 400 patients at the ages of 14 to 66 were included in the study. On the images that were included, two maxillofacial radiologists simultaneously examined the presence of radix paramolaris and radix entomolaris by using axial CBCT cross-sections from the pulpal chamber towards the apical. Results: At least one RE or RP was observed in 36 of the 400 patients (9%). A total of 20 RPs (1.25%) were observed, including 2 bilateral and 16 unilateral cases. A total of 38 REs (2.38%) were observed, including 11 bilateral and 16 unilateral cases. There was at least one RE or RP in 16 of the 149 male patients (10.7%) and in 20 of the 251 female patients (8%). Conclusion: Consequently, while the prevalence and types of third root variations differ between different populations, RE is seen more frequently in mandibular first molar teeth, and RP is seen more frequently in mandibular second molar teeth. No significant relationship could be found between sex and the prevalence of third root variations in mandibular molar teeth images included in this study. No significant difference was found between the right and left sides as the localizations of RP and RE in terms of prevalence. Keywords: Radix entomolaris; Radix paramolaris; Root canal morphology; Cone-beam CT; Mandibular molar