YY/T 0625-2016 in English

Background of Standard Revision and Technological Evolution

YY/T 0625-2016, as the core standard in the field of dental orthodontics in my country, replaced the 2008 version and achieved three major technical upgrades: scientific measurement units (bending stiffness unit changed to N/mm), improved parameter accuracy (austenite transformation temperature accuracy ±1℃), and optimized test methods (elastic modulus determination changed to force-displacement curve). This standard revision adopts ISO 15841:2006 international standard, and adds localized content such as the bending stiffness curve diagram of the type orthodontic wire in combination with Chinese clinical practice.

Analysis of core technical requirements

Key test methods

Clinical application recommendations

1. Material selection: Type I is suitable for cases requiring stable correction force, and Type II is suitable for complex cases requiring temperature-responsive correction
2. Nickel element warning: The new standard requires that products containing harmful elements such as nickel and platinum must be clearly marked with warning symbols
3. Dimension control: The cross-sectional dimension tolerance is changed from ±0.01mm to 0.01mm. Retesting is recommended before clinical use.

Key points for implementation of the standard

Manufacturers need to clearly indicate in the packaging label:
1) Orthodontic wire type and heat treatment process
2) Alloy composition (all elements with a content ≥ 0.1%)
3) Mechanical performance parameters and Af temperature
4) Warning label for harmful elements (nickel-containing products must be specially marked)