MTA placement in curved molars part 1: THE TECHNIQUE
The management to obturate wide apexes is always an issue for anterior teeth. It is even more complicated to use MTA on posterior teeth with wider or altered or curved canals.
The most frequent physiological shape of the apical foramen is round (52.9%) followed by an oval shape (25.2%) (Martos et al. 2010). However, chronic apical periodontitis may lead to altered anatomy, with periforaminal and foraminal resorptions being present, respectively, in over 80% of roots associated with periapical lesions (Vier & Figueiredo 2002). Iatrogenic errors such as stripping, over-instrumentation and apical transportation may also alter the physiological anatomy of the apical foramen (Moore et al. 2009, Gergi et al. 2010). In the presence of oval canals, it is also possible to provide a good adaptation of the MTA, which would be otherwise difficult to achieve with round section Gutta-percha points (Sahni et al. 2008).
A technique to fill root canals is presented. The technique is divided into three main operative stages.