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    The comparison 24-hour bonding performance of novel OrthoMTA and ProRootMTA on root dentin
    (2021) Onur Orhan, Ekim; Irmak, Ozgur; Mumcu, Emre
    Aim: Bioceramic cements act as an alternative dentin replacement materials. The aim was to compare 24h push-out bond strength of novel OrthoMTA (BioMTA, Seoul, Korea) cement, and ProRootMTA(Dentsply Sirona, Tulsa, OK, USA) cement on root dentin.Materials and Methods: Twenty mandibular first premolar teeth were randomly divided into two groups. In each group, three 1-mm thick slices were obtained from the middle third of the root by cutting horizontally. Thirty root slices were obtained from ten roots. In the sectioned root slices, a cavity-like hole was prepared in the center and OrthoMTA and ProRootMTA were placed into the holes per groups. Samples were kept at 36°C, 100% humidity for 24h. The push-out bond strength was calculated (MPa). The critical point drying of all samples was performed followed by scanning electron microscopy evaluation. Results: Adhesive-type of failure at the cement-dentin interface, cohesive-type of failure within the bioceramic cement, and combination of adhesive- and cohesive-type of failures termed as mixed-type of failure were observed. One-way analysis of variance followed by Tukey's test was performed (p0.05).Conclusion: Within the limitations of the in-vitro study the following conclusions can be drawn: 24h after hardening reaction, OrthoMTA presented superior bonding performance than that of ProRootMTA on root dentin (p0.05) and the most common type of failure was mixed-type in both OrthoMTA and ProRootMTA.
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    Evaluation of occlusal vertical dimension loss in worn dentition and their prosthetic rehabilitation; two cases reports
    (2020) Fadhil, Sadeq Mohammed Taqi; Mumcu, Emre
    Tooth erosion is a common condition in humans and may be due to etiologic factors rather than bites. It is generally seen in individuals in vertical occlusal losses depending on the frequency and amount of tooth wear. In such cases, the physician should decide the appropriate treatment for the patient as well as the etiologic cause. In the first case, a 61-year-old male patient presented with insufficient chewing function and aesthetic complaints. Clinical examination revealed vertical size loss due to wearing. The upper anterior teeth were finished with metal-ceramic restorations crowns and the lower and upper posterior teeth with metal- ceramic restorations to increase the vertical size of the patient. In the second case, a 41-year-old male patient presented to our university with a low profile on his face and an aesthetic complaint due to the abrasion of the upper jaw anterior teeth. In this patient, the upper and lower anterior teeth were finished with zirconia crowns and the posterior teeth with metal-supported porcelain restorations to rearrange the vertical dimension. This study aims to present various prosthetic approaches that can be performed in worn tooth cases