Recovering of Nickel & Titanium Rotary From Disposed Rotary Endodontic Files

Nickel-titanium alloys, Acid leaching, Metal recovery, Selective precipitation

1Dr Parvathy Narayanan
Former post graduate student. Dept of
Conservative dentistry and endodontics. KMCT
DENTAL COLLEGE. KOZHIKODE.
KERALA E-mail address [email protected]
orcid id0009-0003-8370-4520

2Ravi S V
Professor. Dept of Conservative dentistry and
endodontics. KMCT DENTAL COLLEGE.
KOZHIKODE. KERALA E-mail address [email protected]
orcid id 0000-00033292-1050

3Dr Elsy P Simon
Professor & HOD. Dept of Conservative
dentistry and endodontics. KMCT DENTAL
COLLEGE. KOZHIKODE. KERALA E-mail
address - [email protected]
ORCID ID - 0000-0002-4686-490X

Received-15-06-2026
Revised-17-07-2026
Accepted-20-07-20.26

European Journal of Prosthodontics and Restorative Dentistry (2026) 34(5s), 96-103

Recovering of Nickel & Titanium Rotary From Disposed Rotary Endodontic Files

Nickel-titanium (NiTi) rotary endodontic files are vital in modern dentistry due to their superelasticity. However, their disposal presents environmental and economic challenges as NiTi is non-biodegradable and contains valuable metals. This study investigates a sustainable hydrometallurgical method using sulfuric acid leaching to recover nickel (Ni) and titanium (Ti) from discarded files. Results demonstrate peak recovery efficiencies of 87.5% for Ni and 78.3% for Ti, yielding high-purity crystalline oxides (NiO and TiO₂) suitable for industrial reuse.

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