Objective:To evaluate the shaping ability of Reciproc and Twisted-File Adaptive systems in
rapid prototyping replicas.Material and Methods:Two mandibular molars showing S-shaped and 62-degree curvatures in the mesial root
were scanned by using a microcomputed tomography (μCT) system. The data were
exported in the stereolitograhic format and 20 samples of each molar were printed
at 16 µm resolution. The mesial canals of 10 replicas of each specimen were
prepared with each system. Transportation was measured by overlapping radiographs
taken before and after preparation and resin thickness after instrumentation was
measured by μCT.Results:Both systems maintained the original shape of the apical third in both anatomies
(P>0.05). Overall, considering the resin thickness in the 62-degree replicas,
no statistical difference was found between the systems (P>0.05). In the
S-shaped curvature replica, Reciproc significantly decreased the thickness of the
resin walls in comparison with TF Adaptive.Conclusions:The evaluated systems were able to maintain the original shape at the apical third
of severely curved mesial canals of molar replicas.
A novel coaxial tubular device capable of generating a 2.5 cm long pencil-like plasma plume in ambient atmosphere has recently been developed to disinfect root canal systems during endodontic treatment. Powered with short (%100 ns), intense (6 kV) electric pulses at 1 kHz, the plasma dental probe is safe for operation, electromagnetic noisefree, with low power consumption (an average power of %1 W) and minimal heating of materials under treatment. It thus has the essential features required for oral and dental disinfection. In this communication, we present the design of the device and evidence that the plasma dental probe is effective for tooth surface disinfection. Scanning electron microscopy shows complete destruction of endodontic biofilms for a depth of 1 mm inside a root canal after plasma treatment for 5 min. Plasma emission spectroscopy identifies atomic oxygen as one of the likely active agents for the bactericidal effect.
Irrigation enhancement beyond needle irrigation is relevant to more effectively eradicate microorganisms from root canal systems. PIPS may be an alternative approach due to its ability to create high streaming velocities further away from the activation source compared to ultrasonic activation.
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