Abstract
Introduction: Although rotary instrumentation has been widely studied in permanent dentition, it is a rather new field of study concerning primary teeth. Purpose: We aimed to evaluate apical displacement and time needed for instrumentation of root canals of primary molars by manual and rotary techniques. Materials and Methods: Root canals of 144 extracted first and second primary maxillary molars were randomly divided into 2 groups: I- manual instrumentation (K-files); II- rotary instrumentation (K3 Rotary System®). The canals were radiographed with pathfinding files in place, prepared by both techniques, and instrumentation time was recorded. After preparation, root canals were radiographed again with pathfinding files in place. To analyze the degree of apical displacement, digital images were superimposed using the Adobe Photoshop® software. Results: Mean apical displacement (0.70 mm) in the manual instrumentation group was not statistically different from that in the rotary instrumentation group (0.79 mm). However, mean time for root canal preparation was significantly shorter using the rotary system (128.0 s) than using the manual system (174.0 s) (p<0.05). Conclusions: The use of rotary instrumentation in pediatric dentistry is feasible, offering time-saving advantages in root canal preparation.
Highlights
Rotary instrumentation has been widely studied in permanent dentition, it is a rather new field of study concerning primary teeth
Considering the reduced number of studies on this topic in pediatric dentistry, this study aimed to elucidate the apical displacement produced in root canals and the time needed for root canal preparation in primary teeth by the rotary instrumentation system in comparison with the manual instrumentation technique
The lowest apical displacement was observed in the distobuccal root of the first primary maxillary molar (0.15 mm) and the greatest apical displacement was found in the mesiobuccal roots of the first and second primary maxillary molars (1.64 mm)
Summary
Rotary instrumentation has been widely studied in permanent dentition, it is a rather new field of study concerning primary teeth. Purpose: We aimed to evaluate apical displacement and time needed for instrumentation of root canals of primary molars by manual and rotary techniques. Studies have compared rotary with manual instrumentation performance for root canal preparation in permanent teeth. Rotary instrumentation characteristics become significantly relevant when dealing with endodontic preparation of primary teeth, since appointment length is a crucial factor for pediatric patient compliance, and maintaining the original path of the root canal is essential to ensure the integrity of the germ of the permanent successor [6,7]. Considering the reduced number of studies on this topic in pediatric dentistry, this study aimed to elucidate the apical displacement produced in root canals and the time needed for root canal preparation in primary teeth by the rotary instrumentation system in comparison with the manual instrumentation technique
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