Abstract
Manual instrumentation is still reported as the main choice in the primary teeth preparation; however, studies have shown limitations in its use. The morphological characteristics of primary teeth and the limited knowledge of shaping procedures in these teeth using mechanical preparation become a challenge for clinical practice and might impair the predictability of endodontic treatment.
Highlights
In cases of primary molars with irreversibly inflamed or necrotic pulp, the endodontic treatment is considered as a conservative therapy, since it maintains these teeth until their physiological exfoliation
The paired-t test showed that all the canal preparation techniques increased significantly the area, minor diameter, volume and surface area of the mesial and distal canals
Self-Adjusting File (SAF) group presented the smallest mean increase of area, minor diameter, volume and surface area of the mesial and distal canal compared with hand files (HF) and ProTaper Next (PTN) groups (p
Summary
In cases of primary molars with irreversibly inflamed or necrotic pulp, the endodontic treatment is considered as a conservative therapy, since it maintains these teeth until their physiological exfoliation. The maintenance of primary teeth contributes to mastication, phonation, and aesthetics, and avoids development of deleterious oral habits. The maintenance of primary teeth prevents changes in chronology and eruption sequence of permanent teeth [1,2]. When planning and deciding on the cleaning and shaping protocol for primary teeth, their morphological characteristics must be considered [1,11], especially for posterior teeth, which have shorter and more curved roots, thinner dentin walls and ectopic surface resorption and a root canal system (RCS) characterized by a ribbon-shaped morphology [12]. It is important to choose instruments that maintain the original canal shape without producing deviations and provide a uniform removal of dentin from the canal walls
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