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    The effects of root canal perforation repair materials on the bond strength of fiber posts
    (Sage Publications Ltd, 2021) Tavsan, Oguz; Simsek, Neslihan
    Introduction: This study aimed to evaluate the effect of calcium hydroxide and bioceramics used in perforation repair on the bonding strength of fiber posts via a push-out test. Methodology: This study used 106 extracted single-rooted human mandibular premolar teeth. Root canal preparations were performed with a rotary file system and perforations were created in the middle third of each tooth. The samples were randomized into two main experimental groups, one with calcium hydroxide and one without. Each group had four subgroups in which different bioceramic cements were applied (n = 11) and a control group (n = 9). The root canals perforations were repaired using MTA, Biodentine, Bioaggregate, and Endosequence BC root repair material. A fiber post was applied to each tooth and a push-out test was performed. The samples were examined at 40x magnification with a digital microscope in order to identify fracture type. Results: Bonding strength was calculated in MPa. A statistical analysis showed that the calcium hydroxide had no effect on the bonding strength of the fiber posts. A comparison of the perforation repair materials revealed that Biodentine in the calcium hydroxide group and Bioaggregate in both groups decreased the bonding strength compared to the other materials (p < 0.05). The most common failure type was adhesive failure between the dentin and resin cement (38.16%). Conclusions: The use of different perforation repair materials can affect the bonding strength of fiber posts. Therefore, the choice of perforation repair material should be made on an individual basis.
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    Hemisection: A modern endodontic approach as an alternative treatment for the extraction of molar teeth-case series
    (2020) Tavsan, Oguz; Ozturk, Hasan; Simsek, Neslihan
    Hemisection is the separation of the whole tooth from the mesial to distal in the upper molars and premolars and from the buccal to lingual in the lower molars, and removal of the pathological root together with the crown. Hemisection is an appropriate treatment option when caries, resorption, iatrogenic complication or periodontal damage is limited to one root and the other root is relatively healthy. Hemisection of the affected tooth helps to preserve alveolar bone which surrounding the tooth structure and supports fixed dentures. Therefore, when a molar tooth should be extracted only because of damage at one root, hemisection or root amputation treatment alternatives should be kept in mind. This case series describes hemisection as a successful treatment method to recover teeth with iatrogenic complications and irretrievable root caries were limited to single root.