Clinical application of Heat-Activated Denco Chameleon Dual Shaper Files in the Endodontic Treatment of a Maxillary Premolar with Symptomatic Irreversible Pulpitis
15/07/2026
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Successful endodontic treatment relies on effective cleaning and shaping while preserving the original root canal anatomy. Heat-treated nickel-titanium (NiTi) instruments have enhanced the safety and predictability of root canal preparation, particularly in anatomically complex teeth. This clinical report describes the use of the Denco Chameleon Dual Shaper heat-activated rotary file system in the treatment of a maxillary premolar diagnosed with symptomatic irreversible pulpitis.
After administration of local anesthesia and rubber dam isolation, a conservative access cavity was performed under magnification. Canal patency was established using a #10 K-file, and working length was determined with an electronic apex locator and confirmed radiographically.
Root canal shaping was carried out using the Denco Chameleon Dual Shaper sequence (SX, 20/.04, 25/.04 and 30/.04; 25 mm). Instrumentation was performed at 150–300 rpm with a torque setting of 1.5–3.0 N·cm, following the manufacturer’s recommendations.
The heat-activated NiTi alloy provided excellent flexibility and controlled canal negotiation, particularly in the curved buccal root, allowing a centered preparation while minimizing the risk of canal transportation. Copious irrigation with 5.25% sodium hypochlorite was performed throughout instrumentation, followed by a final irrigation protocol with EDTA and sodium hypochlorite activation.
Apical preparation was completed according to the canal morphology, resulting in a continuously tapered preparation suitable for three-dimensional obturation.
maxillary premolars frequently present anatomical variations, including narrow canals, abrupt curvatures, and occasional bifurcation of the root canal system. Therefore, instrumentation systems combining flexibility with high resistance to cyclic fatigue are advantageous.
The Denco Chameleon Dual Shaper heat-treated alloy exhibited excellent flexibility and cutting efficiency while maintaining the original canal anatomy. The 4% taper offers a conservative shaping philosophy, preserving pericervical dentin without compromising irrigation effectiveness.
These characteristics make the system particularly suitable for the management of vital pulp cases requiring minimally invasive yet efficient canal preparation.
Conclusions
Within the limitations of this clinical report, the Denco Chameleon Dual Shaper rotary system demonstrated excellent handling characteristics during the treatment of a maxillary premolar with symptomatic irreversible pulpitis. The heat-treated NiTi alloy, conservative taper, and enhanced flexibility allowed safe and predictable canal shaping while preserving root structure. Additional clinical and laboratory studies are needed to further validate the long-term performance of this instrumentation system.
