Evaluation of microhardness of mineral trioxide aggregate: ortho versus retro obturation in relation with root resection in vitro
Date Issued |
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2015-05-06 |
Bibliogr.: p. 175-176
Introduction Surgical access can be compromised by anatomic structures in particular clinical situations when root resection is the option of endodontic treatment. Root canals filled with Mineral Trioxide Aggregate (MTA) before surgical endodontics might be beneficial in such clinical cases. After resection of the root apex, there would be no need for retro-preparation and retro-filling, thus it would simplify surgical procedure and shorten it’s time. It is important to know whether MTA used as an orthograde filling material will adequately harden following the resection, and if the seal of the apical part of the root will be similar to the retrograde filling with MTA. Thus, study regarding hardness of the orthograde and retrograde filling of MTA following root resection is needed.Aim Aim of the study was to identify and compare microhardness of MTA with respect to the method used to fill apical part of the root in case of root resection in vitro. Objectives 1. Identify and compare the MTA microhardness with respect to the distance from the root apex, when this cement is used as retro-filling; 2. Identify and compare the MTA microhardness with respect to the distance from the root apex, when the apical part of the root is filled with this cement before the root resection; 3. Compare the MTA microhardness, according to the method of filling of apical part of the root when resection procedure is performed in vitro. Methods Twenty roots of freshly extracted human maxillary incisors were shaped using rotary instruments Protaper Universal (Dentsply Maillefer) till size F5 (50/05) at the apex and 2.5% NaOCl. All specimens divided into 2 groups according to the method used to fill apical part of the root with MTA (ProRoot MTA; USA): group A (n = 10) – retrograde, group B (n = 10) – orthograde. Group A: the root canals were filled with guttapercha and Adseal sealer (Meta Biomed), orifices isolated with IRM (Dent[...].